HomeMy WebLinkAboutAUTH-10-2022-182839.TIF '� CATAWBA COUNTY Case#
i-, .l Public Health Department Subdivision
.�e ' Environmental Health Division PIN# 369702859937
PO Box 389,25 Government Drive,Newton,NC 28658 LOT#
/84 , w
Site Address: 6961 LITTLE MOUNTAIN RD, SHERRILLS FORD NC 28673
Name on Permit: *RICHARD LINDER
Property Size: Acres 1.24
Directions: Little Mt Rd 1 mile N of Intersection between Little Mt&Mt Pleasant
Owner/Authorized Representative Acknowledgement of Permit Receipt
certify that I am the owner or authorized agent(owner's authorization required)representing the owner of
the property described above.
e property owner or authorized representative, I have received the above referenced
ermit(s)as requested in the application for service RBPR-12-2020-36238,by the following method(s):
✓ Received in Person
Facsimile Transmittal (Return form with signature required)
Electronic Image Transmittal/E-mail (Return receipt required)
the property owner or authorized representative I have reviewed and understand the specific conditions
f the permit issued, and further understand that all applicable regulatory requirements specified under the
North Carolina Laws and Rules for Sewage Treatment and Disposal Systems (15A NCAC 18A.1900),
and/or Well Construction Standards(15A NCAC 2C.0100), shall apply to the issuance of this permit and
the construction of the wastewater system and/or water su ply well permitted.
Permit Issue Date: 10/24/2022
Owner/Authorized
Representative Signature
Dal�D2L�/ ( —
Documentation of Permit(s)Transmittal
(permit transmitted by electronic or other means)
Permit transmitted by (name ofperson sending permit)
Signature Date/Time
Method: Fax Email US Mail Other
Owner's request to send by the above indicated method of transmittal in lieu of signature
We wantt tto hear from yoiPlease ttake a few momentts tto complette our custtomer service survey att
http://www.surveymonkey.com/s/EHCusttomerService
ehpennii 10/24/2022 09:21
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CATAWBA COUNTY Case IV Al1TH-10-2022-182839
• .i.IR Public Health Department Subdivision
Environmental Health Division PIN# 369702859937
• mil
PO Box 3R9.25 Government Drive.Newton,NC 28CSR LO'IY!
v'
Site Address: 6961 LITTLE MOUNTAIN RD, SHERRILLS FORD NC 28673
Name on Permit: *RICHARD LINDER
Property Size: Acres 1.24
Directions: Little Mt Rd 1 mile N of Intersection between Little Mt&Mt Pleasant
Authorization to Construct Permit
Permit Category: New Septic Wastewater Flow: 240 g.p.d.
Type of Facility: Primary Residence-New House
Basement? No Basement Plumbing? No Bedrooms: 2
Water Supply: Private Well Maximum Occupants: 4
Soil LTAR: 0.3 g.p.d.lft2
WASTEWATER SYSTEM REQUIREMENTS
Proposed Wastewater System: 50%REDucTION/Eljen Geotextile Sand Filter System Model A42
System Classification: VA-SAND FILTER PRETREATMENT
Septic Tank: New Tank: 1,000 gal
Pump Tank 1.000 gal Grease Trap_gal
Dosing Volume 102 gal Pump Specs: 23.42 GPM @ 16 TDH
Pressure Head 2 3 ft Draw Down 4.85 in
Drainfield: Total Area: 408 sq ft Total Trench Length: 136 ft
Aggregate Depth: in Maximum Trench Depth on Downhill Sidewall: 43 in
Minimum Soil Cover: 24 in Minimum Trench Separation: 9 ft on center
Number of Drain Lines: 3 Trench Width: 3 ft
Distribution: LPP
Pre Treatment: NONE
Pump Required ***** Operator Required
Additional Specifications:
*This Permit is issued for Provisional Wastewater System NO: PWWS-2019-01. Eljen Geotextile Sand Filter
System Model A42.
*System shall be installed in accordance with all manufacture guidelines. State Approval Letter and System
Installation Guide are included with the permit.
*Air vents required(See Eljen installation manual section 7.2, figure 13).
*Use 1 Y.inch sch40 pvc for the distribution pipe, sleeved through 4 inch perforated pipe
*LPP distribution with 3/16 inch holes in the distribution pipe. Drill the hole at the 12 o'clock position. One hole
per unit.
*The sand must meet ASTM C33 specifications.
*Keep all parts of septic system and any future repair minimum: 100'from any well, 25'from home, 10'from
property lines, 10'from any water and utility lines.
*Existing well must be abandoned prior to issuance of Operations Permit.
*Abandon the existing septic tank for the old residence.
*A subsurface operator contract signed by both parties must be submitted to CCEH before the operations permit
will be issued. The inspection frequency is 2/year.
cI,prnuii ii/02/2022 15:02
•
CATAWBA COUNTY Case AUTH-I 0-2022-182839
4. , Public Health Department Subdivision
,� Environmental Health Division PIN# 369702859937
PO Box 389,25 Government Drive,Newton,NC 28658 LOT#
/842 a
Site Address: 6961 LITTLE MOUNTAIN RD, SHERRILLS FORD NC 28673
Name on Permit: *RICHARD LINDER
Property Size: Acres 1.24
Directions: Little Mt Rd 1 mile N of Intersection between Little Mt& Mt Pleasant
See also attached site plan.
Landscaping or other site alterations that potentially divert groundwater or surface water toward the septic system, or prevent
proper drainage away from the septic system, including the direction of gutter flows or foundation drains, is not approved,and
may result in failure to approve the initial system installation, or the suspension/revocation of existing permits.
>>>>> Do not install system under wet conditions <<<<<
PROPOSED REPAIR
Repair System Required? Required Soil LTAR: 0.3 g.p.d.lft2
Proposed System: 50%REDUCTION HORIZONTAL
System Classification: IVA-ANY SYSTEM WITH LPP DISTRIBUTION
Pump Required ***** Operator Required
The issuance of this permit by the Health Department does not guarantee the issuance of other permits. It is the responsibility of the applicant
/property owner to insure that all Catawba County Planning/Zoning and Building Inspections requirements are met. This Authorization to
Construct Permit is subject to revocation if the site plan,plat or the intended use changes,or if site conditions are altered. The Authorization to
Construct Permit is not affected by a change in ownership of the property. This permit was issued in compliance with the provisions of the
North Carolina'Laws and Rules for Sewage Treatment and Disposal Systems' (15A NCAC I8A.1900). Neither Catawba County nor the
Environmental Health Specialist warrants that the septic tank system will continue to function satisfactorily for any given period of time.
Any permit issued for a conventional system may be used for an accepted system without Environmental Health authorization or permit
modification.Please notify Environmental Health of this change prior to system installation.
P/11)/(1
10/24/2022
Authorized State Agent Permit Issuance Date
10/24/2027
Permit Expiration Date
No grading or construction activity is allowed in areas designated for system and repair without approval of the Health Department.
ehpennit 11/02/2022 15:02
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6961 Little Mountain Rd Eljen 2bedroom design.
240gpd/0.3Ltar= 800 sqft
50%reduction =400sqft
400/3ft wide trench= 133 linear feet of trench required
Each Eljen unit is 4 feet long:
• Line 1- 52 ft = 13 eljen units
• Line 2 - 48 ft= 12 eljen units
• Line 3 - 36 ft= 9 eljen units
136ft
34 Eljen Units total.
34 x 3 gallons per unit= 102 gallon dose.
Gallons per minute design:
• LPP distribution with 3/16" holes.
• The 2"schedule 40 supply line requires at least 2lgallons per minute for scour velocity
• Use 1 % inch sch40 pvc for the distribution pipe, sleeved through 4 inch perforated pipe
• 2.3 feet of head pressure (at the end of each line) will produce 0.63 gallons per minute through
each 3/16" hole.
• Drill one hole per unit.
• 34 x 0.63gpm = 21.42 gallons per minute.
• Add two gallons per minute for the anti-siphon hole to size the pump.
Pump run time:
• 102 gallon dose/21.42 gpm =4.76 minute pump run time
1000 gallon pump tank with 21 gallons per inch of storage:
• 102 gallon dose/21 gpi =4.85 inch draw down.
Trench depth on the downhill side:
• 24"of cover+7" of product+ 12" of sand =43" on the downhill side.
• Air vents required (See Eljen installation manual section 7.2, figure 13).
The sand must meet ASTM C33 specifications.
eljen
CORPORATION
November 3, 2022
Robbie Phelps REHS
Environmental Health Supervisor
25 Government Drive
Newton, NC 28658
Mr. Phelps,
This letter is in reference to changes made on the site plan for 6961 little mountain road. I have
reviewed the changes and they conform to parameters outlined in the Eljen design and
installation manual. I approve of the location change and design.
Regards,
ske `T. Meeh,e,
Scott T. Moore
Technical Development Lead
Eljen Corporation
90 Meadow Rd
Windsor, CT 06095
125 McKee Street, East Hartford,CT.06108•Tel: (800)444-1359• Fax: (860)610-0427
NORTH CAROLINA DEPARTMENT OF HEALTH AND HUMAN SERVICES
DIVISION OF PUBLIC HEALTH
ENVIRONMENTAL HEALTH SECTION
ON-SITE WATER PROTECTION BRANCH
PROVISIONAL WASTEWATER
SYSTEM APPROVAL
PROVISIONAL WASTEWATER SYSTEM NO: PWWS-2019-01
Issued To: Eljen Corporation
125 McKee St.
East Hartford, CT 06108
800-444-1359
www.eljen.com
Contact: Jim King
For: Eljen Geotextile Sand Filter(GSF)System Model A42
Approval Date: September 6,2019
In accordance with G.S. 130A-343, 15A NCAC 18A .1969 and .1970,a proposal by Eljen Corporation
for approval of their wastewater system utilizing the Eljen GSF A42 system has been reviewed, and found
to meet the standards of a Provisional System when all of the following conditions are met:
I. General
A. Scope of this Provisional Approval includes all of the following:
1. Siting, design, installation, and operation and maintenance guidelines for Eljen GSF A42
systems to meet NSF-40 and TS-I effluent quality standards in accordance with Rule .1970(a)
Table VII—Effluent Quality Standards for Advanced Pretreatment Systems,and effective
hydraulic performance.
2. Collection of field effluent quality data from Eljen GSF A42 systems designed to meet NSF-
40 and TS-I effluent quality standards in accordance with Rule .1970(a)Table VII.
3. Monitoring activities for Eljen GSF A42 systems to verify compliance with effluent quality
standards and hydraulic performance.
4. Proposal for evaluation of this Provisional System.
B. This Provisional Approval applies to sewage systems with a design daily flow not exceeding
1,500 gallons per day and treating domestic strength wastewater(not high strength or industrial
process wastewater)utilizing Eljen GSF A42 systems.
Use of Eljen GSF A42 systems for facilities with an influent waste strength that exceeds domestic
septic tank quality effluent standards pursuant to Rule .1970(b) may be proposed by Eljen
Corporation and a NC Professional Engineer(PE)to the State for review. The submittal must
include the projected raw wastewater strength(BOD5, COD,TN,7'SS, fats,oils and grease,etc.),
the expected organic loading rate(in pounds of BOD), hydraulic loading rate on the pretreatment
system, and the calculations and references to support the proposed design. State approval shall
be received prior to permitting by the local health department(LHD).
PWWS-2019-01
September 6,2019
Page 2 of 14
C. Any site utilizing an Eljen GSF A42 system required to meet TS-I effluent quality standard shall
have wastewater with sufficient alkalinity to facilitate biological treatment processes. The
influent shall not have a pH or toxins that significantly inhibit microbial growth.
D. Use of Eljen GSF A42 systems that have a design flow exceeding 1,500 gallons per day may be
permitted after review and approval by the State on a case-by-case basis in accordance with the
State Review/Approval Process(Rule 15A NCAC 18A .1938).
E. This Provisional Approval is limited to 200 systems. The intent of this Provisional Approval is to
gain sufficient field experience to qualify this system for Innovative Approval as both NSF-40
and TS-I systems pursuant to Rule .1969(g).
II. System Description
The Eljen GSF A42 system consists of the following components: a State approved septic tank, and
final subsurface treatment and dispersal either in a trench or bed configuration drainfield utilizing one
or more rows of Eljen GSF A42 units.The Eljen GSF A42 unit consists of anti-siltation fabric,4-inch
diameter smooth wall performance distribution pipe,Bio-MattlM,and a cuspated plastic core 24 inches
wide by 48 inches long and seven inches high. The Eljen FSF A42 system includes the GSF A42 unit
and surrounding imported system sand meeting ASTM C-33, and further modified to meet
manufacturer specifications(system sand).(See Attachment A.)
A State approved dosing tank may be used between the septic tank and the Eljen GSF A42 unit if
required to meet site conditions and/or system design.
III. Siting Criteria
A. The Eljen GSF A42 system shall be sited and sized in accordance with Rule .1970 for NSF-40 or
TS-I systems,as applicable.
1. Eljen GSF A42 systems designed to meet NSF-40 effluent standards shall meet the siting
requirements in Rule .1970(d)(1)and(3)and the following criteria:
a. Trench configurations shall not have a design flow exceeding 1,500 gallons per day.
b. Bed configurations in soil classified based on texture as Soil Group I,1I,or III shall not have
a design daily flow exceeding 600 gallons per day. Bed configurations shall not be used in
Group IV soils.
2. Eljen GSF A42 systems designed to meet TS-1 standards shall have a design flow not exceeding
1,500 gallons per day or 480 gallons per day for an existing fill site and shall meet the following
requirements:
a. Trench configurations shall meet the siting requirements in Rule .1970(e)(1)and(3).
b. Bed configurations where the soil is classified based on texture as Soil Group I or II,shall
not have a design flow exceeding 1,000 gallons per day, and shall meet the siting
requirements in Rule .1970(i)(1)and(2).
c. Bed configurations where the soil is classified based on texture as Soil group III shall not
have a design daily flow exceeding 600 gpd and shall not receive any further siting
concessions than those granted to NSF 40 systems.
d. Bed configurations where the soil is classified based on texture as Soil Group I with a
design flow greater than 1,000 gallons per day and not exceeding 1,500 gallons per day,
shall meet the siting requirements in Rule .1970(j)(1) and(2).
PW WS-2019-01
September 6,2019
Page 3 of 14
e. Vertical separation requirements to a limiting condition are measured from the bottom of
the imported Eljen-specified system sand.
B. For bed configurations,the slope shall not exceed 15 percent for an Eljen GSF A42 system designed
to meet NSF-40 standards. For an Eljen GSF A42 system designed to meet TS-1 standards that
utilize TS-I siting or sizing allowances, the slope shall not exceed 10 percent. A hydraulic
assessment completed pursuant to Rules .1970(i)(1)(B) and .1970(p) is required for TS-I systems
using a bed configuration on sites with slopes greater than two percent.
C. The system shall be considered a fill system if any part of the Eljen GSF A42 unit, excluding the
4-inch distribution pipe, is located above the naturally occurring soil surface. Fill systems shall be
installed only on sites with uniform slopes less than 15 percent.
IV. System Sizing
A. The Eljen GSF A42 system shall be sized in accordance with Rule .1970 for NSF-40 and TS-I
systems,as applicable.
1. Eljen GSF A42 systems designed to meet NSF-40 standards shall meet the following:
a. The allowance in Rule .1970(d)(2)for a 25 percent trench or bed size reduction for an Eljen
GSF A42 system is applicable in Group I or II soils with suitable structure and clay
mineralogy. For a bed, the net result is a bed bottom area that is 12.5% greater than the
bottom area required for a conventional trench system receiving septic tank effluent with no
additional pretreatment,per Rule .1955(b)and(c).
b. In Group III Soils,there is no trench or bed size reduction. The bed bottom area for the GSF
system shall be 50%greater than the bottom area required for a trench system.
2. Eljen GSF A42 systems designed to meet TS-I standards shall meet the following:
a. The trench length may be reduced in accordance with Rule.1970(e)(2)up to a maximum of
50 percent when compared to the trench length required for a conventional system receiving
septic tank effluent with no additional pretreatment.
b. The bed system shall be sized pursuant to Rule .1970(i)(3)(A), with up to a maximum
reduction of 50 percent in Group I or 11 soils when compared to the area required for a bed
system receiving septic tank effluent with no additional pretreatment.The net result is a bed
bottom area that is 75% of the bottom area required for a conventional trench system
receiving septic tank effluent with no additional pretreatment.
B. Example calculations for sizing are provided in Attachment B.
V. Special Site Evaluation
A special site evaluation may be required based on the requirements of Rule .1970 for the proposed
dispersal field.
VI. Design Criteria
A. The Eljen GSF A42 System shall be designed in accordance with the following criteria.
l. A State approved septic tank sized as required in Rule .1952 shall be provided. An access riser
with lid extending at least to finished grade shall be provided over the outlet tank compartment
(and effluent filter)and be designed and maintained to prevent surface/water inflow.
2. A pump tank shall be provided if needed to overcome site and design constraints or for pressure
distribution. A State approved pump tank shall be sized as required in Rule .1952. If a pump
•
PW WS-2019-01
September 6,2019
Page 4 of 14
tank is provided,dosing may be demand dosing or timer-dosing for a system designed for up
to 1,000 gallons per day.Timer-dosing is required for a system designed for over 1,000 gallons
per day. Dosing shall be a maximum of three gallons per Eljen GSF A42 unit per dose. A low-
pressure distribution network (pressure dispersal) may be constructed as well in accordance
with manufacturer's specifications.
3. Components common to all Eljen GSF A42 Systems:
a. Septic tank for primary treatment
b. Distribution box or pressure manifold(when the design calls for more than one row of
Eljen GSF A42 units in a trench or bed configuration)
c. Effluent filter on the outlet of the septic tank
d. Eljen GSF A42 Units(each unit measures 24-inches wide,48-inches long and 7-inches
high)
e. Geo-textile anti-siltation cover fabric supplied by manufacturer
f. Sampling devices and inspections ports
g. Vent(when cover over cuspated plastic core is greater than 18-inches deep; otherwise
optional)
h. Four-inch diameter perforated(holes aligned at 4 and 8 o'clock position),smooth wall
distribution pipe
i. System sand meeting ASTM C-33 and further modified to meet manufacturer
specifications(See Attachment A.)
4. The minimum number of Eljen GSF A42 units per bedroom is six or 25 units per 100 foot of
trench,whichever is greater.
5. In a trench configuration,each Eljen GSF A42 unit shall be aligned in the center of the trench
and be butted together end-to-end with no voids or spaces between units. In a bed
configuration, Eljen GSF A42 units shall be evenly spaced across the system sand in the bed
and each Eljen GSF A42 unit shall be butted together end-to-end with no voids or spaces
between units,except for the Eljen specified system sand between each lateral row(i.e.
relative to the distribution device)of units.
6. Minimum system sand depths and minimum and maximum spacing requirements are as
follows:
a. Minimum sand below each Eljen GSF A42 cuspated unit:NSF-40: 6 inches;TS-I: 12
inches
b. Minimum center to center spacing of Eljen GSF A42 units: Trench: 108 inches; Bed:
36inches
c. Maximum center to center spacing of Eljen GSF A42 units: Bed: 48 inches with Eljen-
specified system sand between units
d. For bed configuration, horizontal distance from the center of the outer row of units to the
side of the bed:NSF-40: 18-48 inches;TS-I: 18—48 inches
e. Horizontal distance containing system sand from end of a row of units to the ends of the
trench or bed: 6— 12 inches
f. Minimum cover over unit— 12 inches(8 inches over pipe)
7. Minimum and maximum Eljen GSF A42 unit row lengths:
a. Minimum length—20 feet
b. Maximum length—60 feet gravity dispersal(longer row allowable with pressure
dispersal in accordance with manufacturer's specifications for pressure dispersal)
8. To meet the spacing requirements in A.5 and 6,it may be necessary to provide more Eljen GSF
A42 units than the minimum required by A.4. Units shall be spread uniformly within the
dispersal field.
9. The system design shall incorporate provisions for complying with the flow monitoring
PW WS-2019-01
September 6, 2019
Page 5 of 14
requirements of Rule .1970:
a. If a pump is involved,a cycle counter will be incorporated into the pump's control
circuit.This cycle counter will be used to estimate daily flow.
b. If the system is gravity fed,the system design will either incorporate a siphon system
with a dosing cycle counter, or a tipping D-box with a cycle counter, where the counter
display would be used as a mechanical logger.
c. A data logging system will be incorporated with the cycle counter in order to allow
review of flows over time.
d. In the rare instance where none of the above options are feasible,a water meter can be
placed on the incoming line to the house connected to a data logging system,with the
understanding that not all the water entering the house will enter the septic system due to
personal consumption, landscaping purposes,etc.
10. For bed systems designed for over 1,000 gallons per day and to not exceed 1,500 gallons per
day,two or more beds shall be used, and effluent shall be distributed to each bed and separate
rows of Eljen GSF A42 units uniformly and evenly over a 24-hour period using a pump,
pump control,and effluent dispersal system, in accordance with manufacturer requirements
for pump systems.
B. Eljen GSF A42 systems shall be designed by an Eljen-certified designer or a NC PE. Systems over
1,000 gallons per day shall be designed by a NC PE.
VII. Installation and Testing
A. An on-site preconstruction conference shall be required to be attended by the GSF system
designer,NC PE(if required),certified installer, LHD, licensed soil scientist(as applicable),
property owner or owner's representative, and Operator in Responsible Charge(ORC), if known,
prior to beginning construction of the Eljen GSF A42 system.
B. The Eljen GSF A42 system shall be located in compliance with the horizontal setback
requirements of Rule .1950(a)and Rule .1970,as applicable,and shall be located to prevent
surface/subsurface water inflow/infiltration. The horizontal setback requirements in Rule .1970
for NSF-40 or TS-I systems shall be used,as applicable.
C. For Eljen GSF A42 systems,the trench or bed shall be constructed as a rectangle,with the long
axis parallel to the ground elevation contours of the slope, unless it is determined the site's usable
soil depth will allow the system design to be off contour.The bottom of the trench or bed shall be
excavated level,with a plus or minus tolerance of 1/4-inch from side-to-side and a maximum fall
along the trench of one inch in 100 feet. When sited in accordance with the appropriate sections
of this approval,the bottom of the system sand bed for Eljen GSF A42 systems may be installed
up to but no deeper than five feet below finished grade, provided that the vertical separation
requirements in Section III of this approval are met.The system sand bed shall be immediately
installed without allowing machinery to traverse the excavated/exposed bed bottom. Eljen-
approved small track vehicles may be used to traverse across the sand bed during installation only
after at least a six-inch layer of sand shall be under the vehicle at all times.
D. The Eljen GSF A42 units shall be installed level in a trench or bed lined with Eljen-specified
system sand. The surface of the system sand shall be level with a plus or minus tolerance of1/4-
inch from side-to-side and a maximum fall along the trench of one inch in 100 feet. The unit,
including the distribution pipe, is covered by the Eljen-approved geotextile fabric that extends
PW W S-2019-01
September 6,2019
Page 6 of 14
along the full length of the top and sidewalls of the units,per manufacturer specifications. Eljen-
specified imported system sand shall be level with the Eljen GSF A42 cuspated units and extend
laterally at this same minimum elevation over the entire perimeter of the trench or sand bed.
E. Backfill shall be installed over the finished sand trench or bed and between the GSF A42 units
and the perimeter of the system. Backfill shall be free of trash or debris.Minimum backfill depth
shall be 12 inches above the top of the Eljen GSF A42 cuspated units. Native soil (Group I, II, III
or IV)may be used for the up to eight inches above the top of the Eljen GSF A42 cuspated units.
At a minimum,the final four inches of backfill,after settling, shall have a finer texture(such as
Group II or III)for the establishment of a vegetative cover.
F. For a fill system,backfill shall be installed with a side slope not to exceed a rise to run ratio of
1:3, unless a dry stacked interlocking block retaining wall is constructed adjacent to the Eljen
GSF A42 unit and surrounding sand. Any other type of retaining wall shall be designed by and its
construction certified in writing by a NC PE. Use of a retaining wall for supporting backfill does
not supersede side slope requirements for fill systems and setbacks shall be measured from the
toe of the projected side slope.
G. Water tightness of the tanks and any dosing tanks shall be demonstrated by either a 24-hour water
leakage test or a vacuum test conducted at the installation site.A water level change of%z-inch or
more within a 24-inch riser over 24 hours,or visual observation of leakage shall be cause for
failure of the water tightness test. Initial water level shall be to two inches above the riser/adapter
seam.
H. Pump(if needed)delivery rate shall be measured and determined to be in accordance with design
parameters.The initial settings shall be made to pump floats and/or timer controls in the pump
tank based upon the field measurements prior to system start-up.
1. Specified site preparation steps and construction specifications for the dispersal field shall be
strictly adhered to, including specified depth of the trench or bed in relation to site limiting
conditions. All Eljen GSF A42 systems shall be installed according to the provisions of this
approval and directions provided by Eljen Corporation.Additionally, all Eljen GSF A42 system
components not manufactured by Eljen Corporation (distribution pipe,d-box,pumping
components, etc.)shall be installed in accordance with all applicable regulations and applicable
specifications of Eljen Corporation.
J. All individuals/companies installing Eljen GSF A42 systems shall be in possession of all
necessary permits and licenses before attempting any portion of a new or repair installation. The
company/individual shall be a Level IV installer and an Eljen Corporation certified system
installer.
K. Prior to Operation Permit issuance,the Eljen Corporation certified system installer and the NC
PE or manufacturer trained and certified designer of record, as applicable,shall conduct an
inspection/start-up of the Eljen GSF A42 system and all associated system components. The
LHD and the ORC shall attend and observe the inspection/start-up. An acceptance letter from the
installer and NC PE/designer shall be provided to the LHD prior to issuance of the Operation
Permit.
PWWS-2019-01
September 6,2019
Page 7 of 14
VIII. Operation, Maintenance,Monitoring, and Reporting
A. The Eljen GSF A42 system shall be classified as a Type Va system in accordance with Table
V(a)of Rule .1961(b). Management and inspection shall be in accordance with Rules .1961 and
.1970.
B. All Eljen GSF A42 systems require an operation and maintenance agreement between the system
owner and a certified subsurface system operator designated as the ORC to inspect and maintain
the system. The ORC shall meet one of the following criteria:an Eljen Corporation,Inc.employee,
an Eljen authorized representative,or a certified subsurface operator authorized in writing by Eljen
in accordance with Rule .1970. The ORC must have proper equipment and training to inspect,
operate and maintain the system, as applicable.
C. All Eljen GSF A42 systems shall be operated and maintained according to the latest version of
Eljen Corporation's Operation and Maintenance(O&M)manual.
D. The LHD and the ORC must conduct monitoring inspections of Eljen GSF A42 systems at the
frequency specified in Table V(b)of Rule .1961 and per the Operation Permit.
E. At each Eljen GSF A42 system inspection the ORC shall,at a minimum,observe, inspect,
monitor,and record the following:
1. Wastewater level in the tanks;
2. Sludge and scum levels in all the tanks,measure and record;
3. Clogging of effluent filter;
4. Water tightness of tanks, risers and pipe connections at tanks;
5. Operation of pumps, floats,valves, electrical controls and alarms, where applicable;
6. Drainfield pump delivery rate(drawdown test), determination of the average pump run time,
and drainfield dosing volume;
7. Any structural damage, malfunctions, accessibility issues, adequate ventilation, positive
drainage, odor issues, insect/wildlife infestations, approved vegetative cover over the
drainfield,saturation,ponding or surfacing of effluent on the drainfield area,and the designated
repair area remains intact/undisturbed;
8. A sample of effluent collected from the sampling port as indicated in the approved sampling
protocol to check for effluent clarity and odor;
9. Samples of Eljen GSFA42 influent and effluent as required, as indicated in the approved
sampling protocol;
10. Readings from pump cycle counters and run time meters and any water meter readings, as
applicable;and
11. System operating conditions from the review of stored data for indication of 7-day and 30-day
flows and flow variances or other abnormal conditions.
F. Sampling
1. All sampling shall be done in accordance with Rule .1970(n)(3)and(5).
2. All systems shall be tested for effluent CBOD5 and TSS. Influent shall be tested for BOD5.All
TS-1 systems shall additionally have influent tested for TKN and effluent tested for NH4-N and
fecal coliforms.
3. Additional sampling of effluent or influent may be determined to be necessary by the ORC
during a system inspection to assist with troubleshooting or to verify system performance.
PWWS-2019-01
September 6,2019
Page 8 of 14
4. Influent samples shall be taken from a sampling port located between the septic tank and the
drainfield or from the dosing tank(where applicable).
5. Effluent samples shall be collected from the sampling device.
6. Adjustments in the monitoring schedule and number of parameters sampled may be proposed
by the manufacturer and approved by the State as a modification to this Provisional Approval.
G. Notification and Performance of Maintenance and Repairs
1. The ORC shall notify Eljen Corporation, the LHD,and the system owner within 48 hours of
needed maintenance or repair activities including, but not limited to, landscaping,tank
sealing,tank pumping,pipe or control system repairs, Eljen GSF A42 unit replacement,
and/or adjustments to any other system component. Repair activities will require a repair
permit to be issued by the LHD prior to construction.
2. The ORC shall keep the septic tank outlet effluent filter or screened pump vault cleaned and
in proper operating condition,as per manufacturer's recommendations.
3. The ORC shall notify the system owner, Eljen Corporation,and the LHD whenever the pump
delivery rate efficiency and/or average pump run times are not within 25% of initial
measurements conducted prior to system start-up.
4. The septic tank will be pumped as needed upon recommendation of the ORC and in accordance
with the Eljen GSF A42 System Operation and Maintenance instructions. However, at a
minimum,the septic tank will be pumped whenever the solids level exceeds 25%of the tank's
total liquid working capacity or the scum layer is more than four inches thick.
5. The tanks shall be pumped by a properly permitted septage management firm,and the septage
handled in accordance with ISA NCAC 13B .0800.
6. All maintenance activities shall be logged and recorded in the ORC reports provided to the
LHD.
H. The ORC shall also conduct other additional observations,measurements,monitoring,and
maintenance activities for any system component(septic tank,pump tank,controls,drainfield,
etc.),as specified in the Operation Permit and as recommended by the manufacturer.
1. Reporting
I. The ORC shall provide a completed written report to the system owner, Eljen Corporation,and
the LHD within 30 days of each inspection. At a minimum this report shall specify:
a. Location of property(physical address);
b. Name of property owner(s);
c. Type of facility (primary residence, vacation residence/rental, business,or public
assembly);
d. The date and time of inspection;
c. System operating conditions measured and observed according to VIII.E, F, G and H;
f. Results from any laboratory analysis of any influent and effluent samples;
g. Maintenance activities performed since the last inspection report;
h. An assessment of overall system performance;
i. A list of any improvements or maintenance needed;
j. A determination of whether the system is malfunctioning, and the specific nature of the
malfunction;
k. Any weather conditions that may have influenced system performance; and
1. Any changes made in system settings based on recommendations of the manufacturer.
PW WS-2019-01
September 6,2019
Page 9 of 14
2. Proposal for Evaluation and Reporting
a. The manufacturer shall maintain a contract for evaluation of the performance of the
Provisional wastewater system with an independent third-party laboratory,consultant,or
other entity that has expertise in the evaluation of wastewater system and that is approved
by the State.
b. Semi-annual reports are due to the State by January 31 and July 31 of each year from the
third-party.The reports shall include the following information at a minimum:
(1) list of all systems currently installed under the Provisional Approval;
(2) results of all effluent quality samples collected,including a table summarizing
all the effluent quality results;
(3) results of all ponding measurements;
(4) flow monitoring,type of facility,and occupancy information;
(5) copies of all ORC inspection reports;
(6) assessment of system performance in relation to effluent quality standards and
showing compliance with Rule .1970(o);
(7) assessment of system performance in relation to flow monitoring and showing
compliance with Rule .1970(o);
(8) assessment of physical and chemical properties of the materials used to
construct the system in terms of strength, durability, and chemical resistance to
loads and conditions experienced and showing compliance with Rule
.1969(g)(2)(B);
(9) recommended areas of applicability for the system; and
(10) conditions and limitations related to the use of the system.
c. Upon completion of the research and testing protocol,the third-party shall submit a final
report to the State.This report shall be submitted in conjunction with Eljen Corporation
completing an application for Innovative Approval and within five years of the effective
date of the first OP issued pursuant to this approval.
d. The final report shall contain the following information at a minimum:
(1) list of all systems currently installed during the Provisional Approval period;
(2) results of all effluent quality sampling and ponding measurements, including
tables summarizing all the effluent quality and ponding results;
(3) flow monitoring information;
(4) copies of all ORC inspection reports;
(5) assessment of system performance in relation to effluent quality standards and
showing compliance with Rule .1970(o);
(6) assessment of system performance in relation to flow monitoring and showing
compliance with Rule.1970(o);
(7) assessment of physical and chemical properties of the materials used to
construct the system in terms of strength,durability, and chemical resistance to
loads and conditions experienced and showing compliance with Rule
.1969(g)(2)(B), and hydraulic performance;
(8) recommended areas of applicability for the system;and
(9) conditions and limitations related to the use of the system.
e. The Final Report shall be in electronic format and may be published on the On-Site
Water Protection Branch's website without confidentiality. The contents of the semi-
annual and final reports shall not be altered from the original document without approval
from Eljen Corporation.
P W W S-2019-01
September 6,2019
Page 10 of 14
f. The research and testing protocol shall be managed by 3-Engineering. LLC or other
approved third-party evaluator and includes the following minimum activities outlined in
a detailed protocol that is appended to this Provisional Approval:
(1) A minimum of 50 complete data sets shall be collected from a minimum of 15
sites each,for NSF-40 and TS-I systems.
(2) A complete data set includes the following information: influent BOD(NSF-40
and TS-I systems)and TKN (TS-1 systems); and effluent CBOD and TSS
(NSF-40 and TS-I systems),and fecal coliforms and NH4-N (TS-I systems).
There must be at least 30 days between samples collected from any one site.
(3) Samples shall be collected from all sites. A site may be excluded if adequate
justification is provided that the site is unsuitable as a test site.The samples
from that site must be provided but tivil] not be used as part of the data
evaluation.
(4) Each site shall produce a minimum of two complete data sets collected over at
least a 12-month period.
(5) For coastal resort communities,two samples shall take place between June 1
and September 8 of each year.The samples must be taken at least six weeks
apart.
(6) Other seasonal homes shall be inspected by the ORC and sampled during the
projected times of peak use and/or occupancy.Samples shall not be collected
during periods with Iimited or no occupancy.
(7) The samples will be collected during a scheduled visit by the ORC.
(8) A copy of the sample results will be provided to the On-Site Wastewater
Branch after the analyses,
(9) Data from Ellen GSF A42 systems installed on NSF-40 sites and designed to
meet NSF-40 effluent quality standards, may be sampled for TS-I parameters,
and may be used in support of attaining TS-I Innovative Approval status. If
analyzed, data for all TS-I parameters shall be reported, even if not ultimately
utilized as a compliant site for TS-1 approval.
(10) Hydraulic performance shall be assessed based upon ponding conditions
measured in 3-inch wide observation ports extending to finished grade shall be
installed for each system at the Eljen-specified artificial system sand-soil
interface on the trench/bed bottom and on the top of the cuspated units.
Observation ports to the sand-soil interface shall be installed a minimum of 2-
inches away from the cuspated units, in order to avoid short-circuiting from the
unit to the sand-soil interface
(a) For trench configurations,two observation ports located adjacent to the
cuspated unit that terminate at the sand-soil interface shall be installed for
each trench: one at proximal end, and one at the distal end of the trench.
For a bed configuration,hydraulic performance observation ports located
adjacent to the cuspated units that terminate at the sand-soil interface shall
be installed, as follows:
i) For beds up to nine feet wide, a minimum of three ports shall be
installed: one located at the beginning, middle,and the end of the bed
and staggered within the bed.
ii) For beds wider than nine feet,a minimum of five ports shall be
installed.
(b) For a trench or bed configuration each row of Eljen GSF A42 product shall
include three observation ports that terminate at the top of the cuspated
PW W S-2019-01
September 6,2019
Page 11 of 14
units: one at the proximal end,one at the distal end,and one in the center
of each row.
(c) One of each type of observation port shall be installed within 10-ft of any
sampling port installed for effluent monitoring.
The hydraulic performance shall be assessed in accordance with the following:
(a) A minimum of 15 NSF-40 and 30 TS-1 sites shall be evaluated for
hydraulic performance.
(b) A minimum of 5 NSF-40 and 10 TS-I sites shall be evaluated for hydraulic
performance in each of the three geographic regions of the state(Coastal,
Piedmont, Mountain) prior to granting innovative approval for use in that
portion of the state.
(c) At least 95 percent of all observations,and 95 percent of all sites shall pass
the hydraulic standard during each site assessment. A minimum of 90
percent of all approval criteria must be met for all sites within a single
geographic region of the state.
(d) Pass criteria for hydraulic performance is effluent ponding no higher than
3-inches above the sand-soil interface and no higher than 2-inches above
the top of the cuspated unit observation ports;and for the"site" average
ponding levels of 3-inches or less in all sand-soil interface observation
ports and 2-inches or less in the top of the cuspated unit observation ports.
Observation data can be discarded if a one inch or greater rainfall occurred
in the last 24 hours. Failed observation data can also be discarded if the
port is re-inspected from no more than three days afterwards and found to
pass upon re-inspection.
(e) At least one measurement for each site used for the hydraulic performance
assessment shall be taken during a typical wet-weather period(January
through March)and after the system has been in use for at least six months,
and no more than two measurements taken at a single site shall be used for
the overall hydraulic performance assessment.Observation port readings
shall be taken from all observation ports during each effluent sampling
collection day,and all data collected shall be reported.
(11) In order to meet the effluent monitoring and hydraulic performance criteria in
this Paragraph,data may be presented that has been collected as part of a
comparable third-party evaluation in another State or Canada.
IX. Responsibilities and Permitting Procedures
A. Prior to the installation of an Eljen GSF A42 system at a site,the owner or owner's agent shall fill
out an application at the LHD for the proposed use of this system. The LHD shall issue an
Improvement Permit or Authorization to Construct or amend a previously issued Authorization to
Construct allowing for the use of an Eljen GSF A42 system.
B. The Improvement Permit and Authorization to Construct shall contain all conditions the site
approval is based upon, including the proposed used of the Provisional System. The Operation
Permit will include all conditions specified in the Improvement Permit and the Authorization to
Construct.
C. When a special site evaluation is required pursuant to Rule .1970(p)(1),an evaluation and written,
sealed report from a Licensed Soil Scientist regarding the site shall be provided to the LHD. The
PW WS-2019-0]
September 6,2019
Page 12 of 14
report shall contain the information as specified in Rule .1970(p)(2) and "Requirements for
Submittals of Soil Reports and Pretreatment and/or Dispersal System Designs". The LHD may
request the assistance of their Regional Soil Scientist in evaluating this report prior to permit
issuance.
D. The Eljen GSF A42 system shall be designed by an Eljen Corporation-certified designer or a NC
Professional Engineer. Systems over 1,000 gallons per day shall be designed by a NC Professional
Engineer.
E. Prior to issuance of an Authorization to Construct for an Eljen GSF A42 system,a design submittal
prepared by an authorized designer or a NC Professional Engineer shall be submitted for review
and approval by the LHD. The design submittal shall include the information required in
"Requirements for Submittals of Soil Reports and Pretreatment and/or Dispersal System Designs".
F. It is recommended that local authorized environmental health practitioners attend a design training
session offered by the manufacturer/authorized representative prior to permitting the system. Also,
at the request of the LHD, a Regional Engineer will review the design.
G. An Eljen Corporation certified installer and company-certified designer or NC PE, as applicable,
shall certify in writing that the Eljen GSF A42 System was installed in accordance with the
approved design prior to Operation Permit issuance.
H. For sites required to be evaluated by a Licensed Soil Scientist or Professional Geologist (see
Sections V and IX.C), the LHD may specify as a condition on the Improvement Permit and
Authorization to Construct that a Licensed Soil Scientist or Professional Geologist oversee critical
phases of the drainfield installation and certify in writing that the installation was in accordance
with their specified site/installation requirements prior to the Operation Permit issuance.
X. Repair of Systems
The provisions of 15A NCAC 18A .1961(1)shall govern the use of the Eljen GSF A42 System for
repairs to existing malfunctioning wastewater systems.
Approved By: Date:
PW WS-2019-01
September 6,2019
Page 13 of 14
Attachment A: SYSTEM SAND SPECIFICATIONS
To ensure proper system operation,the system must be installed using ASTM C33 sand with the
additional requirement for the sand to have less than 10%passing a#100 sieve and less than 5%passing a
#200 sieve. Listed below is a chart outlining the sieve requirements for the Eljen-Specified System Sand.
Ask your material supplier for a sieve analysis to verify that your material meets the required
specifications.
Eljen System Sand Specification (modified from
ASTM C33)
Sieve Square Specification
Sieve Size Opening Size Percent Passing
(Wet Sieve)
3/8 inch 9.52 mm 100
No.4 4.76 mm 95 - 100
No. 8 2.38 mm 80 - 100
No.30 590 gm 25 -60
No. 50 297 }tm 5 -30
No. 100 149 um < lot
No.200 75 }gym <52
1: ASTM C33 Specification for percent passing No. 100 Sieve is 0 to 10%
2:ASTM C33 Specification for percent passing No.200 Sieve is 0 to 5%
Attachment B: Sizing Calculation Examples:
Example Premise:
Three bedroom residence, six occupants, design daily sewage flow 360 glad,on a loamy sand(Group 1)
Total computed trench bottom area is: 360 gpd/1.0-gpd/ft.2 LTAR=360 ft2
I. Eljen GSF A42 NSF-40 Trench System:
360 ft2 x(0.75)25%Trench Bottom Area Reduction' =270 ft2
270 ft2/3 foot wide trench=90 linear ft
OR
The required linear footage for Eljen GSF A42 NSF-40 system is:
360 ft2/4.0 ft=90 linear ft
Where 4.0 ft. is the equivalency factor for the Eljen GSF A42 NSF-40 trench system'
2. Eljen GSF A42 NSF-40 Bed System:
Total computed bed bottom area is:
360 ft2 x 1.50%Bed Bottom Area Increase=540 ft2
540 ft2 x(0.75)25%Bed Bottom Area Reduction'=405 ft2
OR
360 ft2 x 1.125%Bed Bottom Area Increase=405 ft2
3. Eljen GSF A42 TS-I Trench System:
360 ft2 x(0.50)50%Trench Bottom Area Reduction= 180 ft2
180 ft2/3 foot wide trench=60 linear ft
OR
The required linear footage for Eljen GSF A42 TS-I system is:
360 ft2/6.0 ft=60 linear ft
Where 6.0 ft. is the equivalency factor for the Eljen GSF A42 TS-1 Trench system
4. Eljen GSF A42 TS-1 Bed System:
Total computed bed bottom area is:
360 ft2 x 1.50%Bed Bottom Area Increase=540 ft2
540 ft2 x(0.50)50%Bed Bottom Area Reduction' =270 ft2
OR
360 ft2 x 0.75%Bed Bottom Area Reduction' =270 ft2
Note 1:Reductions applicable in Group 1 or II Soils only.
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Table of Contents
SUBJECT PAGE
GLOSSARY OF TERMS 3
GSF SYSTEM DESCRIPTION 4
1.0 DESIGN AND INSTALLATION 5
2.0 TRENCH INSTALLATION SIZING AND GUIDELINES 8
3.0 BED INSTALLATION SIZING AND GUIDELINES 11
4.0 PRESSURE MOUND INSTALLATION GUIDELINES 14
5.0 DOSING DISTRIBUTION GUIDANCE 15
6.0 PRESSURE DISTRIBUTION GUIDANCE 15
7.0 SYSTEM VENTILATION 16
8.0 SYSTEM MAINTENANCE AND SAMPLING REQUIREMENTS 18
9.0 SAMPLING PORT 19
10.0 SAMPLING PORT DESIGN 19
11.0 SAMPLING PORT INSTALLATION 20
12.0 SAMPLING PORT SAMPLING 22
GSF DRAWINGS AND TABLES
DRAWINGS
FIGURE 1: GSF SYSTEM OPERATION 4
FIGURE 2: TYPICAL A42 GSF CROSS SECTION 5
FIGURE 3: PLAN VIEW-A42 MODULES-TRENCH SYSTEM 9
FIGURE 4: SECTION VIEW-A42 MODULES-TRENCH SYSTEM-LEVEL SITE 9
FIGURE 5: SECTION VIEW-A42 MODULES-TRENCH SYSTEM-SLOPING SITE 9
FIGURE 6: PLAN VIEW-A42 MODULES-BED SYSTEM 12
FIGURE 7: SECTION VIEW-A42 MODULES-BED SYSTEM 12
FIGURE 8: CROSS SECTION VIEW-A42 MODULES-BED SYSTEM-SLOPING SITE. 12
FIGURE 9: PRESSURE PIPE PLACEMENT 15
FIGURE 10: PRESSURE CLEAN OUT 16
FIGURE 11: CONTOURED TRENCH PRESSURE DISTRIBUTION 16
FIGURE 12: GRAVITY VENTING 17
FIGURE 13: PRESSURE CLEAN OUT PRESSURE DOSED SYSTEMS 17
FIGURE 14: GSF WITH 4"VENT EXTENDED TO CONVENIENT LOCATION 18
FIGURE 15: PARTS AND DEVICES 19
FIGURE 16: OBSERVATION AND SAMPLING PORT PREPARATION PLAN VIEW 19
FIGURE 17: PLACE BASE SAND 20
FIGURE 18: PLACE SAMPLERS ON SAND 20
FIGURE 19: PLACE PEA GRAVEL IN PAN 21
FIGURE 20: COMPLETE PLACING SPECIFIED SAND 21
FIGURE 21: COMPLETE BACKFILL 22
TABLES
TABLE 1: SPECIFIED SAND SIEVE REQUIREMENTS 3
TABLE 2: TRENCH LOADING RATES 7
TABLE 3: BED LOADING RATES 7
2020 North Carolina Design&Installation Manual Page 2 www.eljen.com
•
•
Glossary of Terms
A42 Module 48"x 24' x 7" (L x W x H)
Cover Fabric The geotextile cover fabric(provided by manufacturer)that is placed over
the GSF modules.
Design Flow The estimated peak flow that is used to size a GSF system is 120 gallons
per day per Bedroom.
GSF The Eljen Geotextile Sand Filter Modules and the 12-inch sand layer at
the base and 6 inches along the sides of the modules.
GSF Module The individual module of a GSF system. The module is comprised of a
cuspated plastic core and corrugated geotextile fabric.
Specified Sand To ensure proper system operation, the system MUST be installed using
ASTM C33 Sand.
ASTM C33 sand will have less than 10% passing the#100 Sieve and less
than 5% passing the # 200 sieve. Ask your material supplier for a sieve
analysis to verify that your material meets the required specifications.
TABLE 1: SPECIFIED SAND SIEVE REQUIREMENTS
ASTM C33
SAND SPECIFICATION
Sieve Square Specification
Sieve Size Opening Size Percent Passing
(Wet Sieve)
3/8 inch 9.52 mm 100
No. 4 4.76 mm 95- 100
No. 8 2.38 mm 80- 100
No. 16 1.19 mm 50-85
No. 30 590 pm 25-60
No. 50 297 pm 5- 30
No. 100 149µm 0- 10
No. 200 75 pm 0-5
2020 North Carolina Design&Installation Manual Page 3 www.eljen.com
•
GSF System Description
Primary Treatment Zone
• Perforated pipe is centered above the GSF module to distribute septic effluent over and into
corrugations created by the cuspated core of the geotextile module.
• Septic effluent is filtered through the Bio-Matt fabric. The module's unique design provides increased
surface area for biological treatment that greatly exceeds the module's footprint.
• Open air channels within the module support aerobic bacterial growth on the modules geotextile fabric
interface, surpassing the surface area required for traditional absorption systems.
• An anti-siltation geotextile fabric covers the top and sides of the GSF module and protects the
Specified Sand and soil from clogging,while maintaining effluent storage within the module.
Secondary Treatment Zone
• Effluent drips into the Specified Sand layer and supports unsaturated flow into the native soil. This
Specified Sand/soil interface maintains soil structure, thereby maximizing the available absorption
interface in the native soil. The Specified Sand supports nitrification of the effluent, which reduces
oxygen demand in the soil,thus minimizing soil clogging from anaerobic bacteria.
• The Specified Sand layer also protects the soil from compaction and helps maintain cracks and
crevices in the soil. This preserves the soil's natural infiltration capacity, which is especially
important in finer textured soils, where these large channels are critical for long-term
performance.
• Native soil provides final filtration and allows for groundwater recharge.
FIGURE 1: GSF SYSTEM OPERATION
Porous Top of the Eljen GSF 1''•. �i +i; r i' .•ti., ;,i Perforated Pipe
allows evapotranspiration and l ',�� I 'I';f;/ IrI���i distributes effluent to the
oxygen exchange for better r ?"+ Eljen GSF. Pipe is secured
effluent treatment. to the GSF Modules with
preformed metal clamps.
Anti-Siltation Fabric t i,. .,
keeps fines out of the Eljen GSF it ', Primary Treatment Zone
J
• forms on Bio-Matt" fabric.
Untreated Effluent Significant fabric provided
Bto-Matt"Fabric for every ft2 of soil interface.
d' #.
Cuspated Plastic Core =-�_`� 1110
Secondary Treatment Zone
provides separation between :: _ , forms at sand layer. Long
rate of this
layers of 8io-Matt'" fabric. _ __ termacceptance
Maintains structural integrity ,- .� I I blomat layer is significantly
' j increased as compared to
of modules & aids oxygen y
transfer. Increases treatment M�:;' I '� �' " • conventional systems.
surface area & effluent : Fr
•� • Specified Sand Layer
storage capacity. •'- ,._ �� •' provides additional filtration
Filtered Effluent `-.-'
Native Soil or Fill
Treated Effluent provides final filtration
2020 North Carolina Design&Installation Manual Page 4 www.eljen.com
•
•
1 .0 Design and Installation
FIGURE 2: TYPICAL A42 GSF CROSS SECTION
/--SEED AND LOAM
MIN 12" OF GEOTEXTILE
CLEAN FILL FABRIC
7"
•
T&D-6" •
l..
TS-I - 12" SPECIFIED SAND
24" .J
36"
A42 MODULE (LxWxH) 48"x24"x7"
All Systems are Required to Have a Minimum of:
• 6 inches of Specified Sand is at the edges of the GSF module.
• 6 inches of Specified Sand is at the beginning and end of each GSF Row.
• 12 inches of Specified Sand is directly below the GSF module.
• Minimum 12 inches of native soil fill above the module.
1.1 REQUIREMENTS: GSF systems must meet the local rules and regulations except as outlined in this
manual. The North Carolina Administrative Code, Section .1900 — Sewage Treatment and Disposal
Systems and the local regulations will be referred to as the guidelines.
The sizing charts apply to residential systems only and are found in section 1.16. Please contact Eljen's
Technical Resource Department at 1-800-444-1359 for design information on commercial systems.
1.2 SPECIFIED SAND SPECIFICATION FOR GSF SYSTEMS: The sand immediately under, between
rows and around the perimeter of the GSF system must meet ASTM C33 SPECIFICATIONS, WITH LESS
THAN 10% PASSING A #100 SIEVE AND LESS THAN 5% PASSING A #200 SIEVE. Treatment and
Dispersal (T&D) systems require 6 inches of sand under the units and TS-I systems require a minimum of
12 inches of sand under the units. Please place a prominent note to this effect on each design drawing.
See Table 1 for more information on the sand and sieve specifications.
1.3 CONNECTIONS AND FITTINGS: Connections of lines to tanks and distribution boxes must be made
using watertight mechanical seals. Use of any grouting material is not permitted.
1.4 PLACING GSF MODULES: The'Painted Stripe' on the GSF modules indicates the top of the module
and is not intended to indicate the location of the distribution pipe. With the painted stripe facing up, all
rows of GSF modules are set level, end to end on the Specified Sand layer. No mechanical connection is
required between modules.
2020 North Carolina Design&Installation Manual Page 5 www.eljen.com
•
1 .0 Design and Installation
1.5 DISTRIBUTION PIPE: SDR-35 or equivalent is required. Place perforated pipe on top of GSF modules
with holes at 4 and 8 o'clock. Secure pipe to GSF modules with provided wire clamps, one clamp per Eljen
module. Furthermore, all piping must meet state and local regulations.
Pressure distribution may be used as well. Two delivery methods are acceptable. Orifice shields are placed
over a SCH 40 pipe, one per unit. A second delivery method is also permissible. Using SDR-35 pipe or
equivalent; a pressure manifold is placed inside the distribution pipe. Section 6.0 of this manual goes into
details of how to construct the distribution network. All piping must meet state and local regulations.
1.6 COVER FABRIC: Geotextile cover fabric is provided by Eljen Corporation for all GSF systems. It is
placed over the top and sides of the module rows to prevent long term siltation and failure. Cover fabric
substitution is not allowed. Fabric should drape vertically over the pipe and must not block holes in the
distribution pipe or be stretched from the top of the pipe to the outside edge of the modules. 'Tenting'will
cause undue stress on fabric and pipe.
1.7 BACKFILL & FINISH GRADING: Complete backfill with a minimum of 12 inches of clean porous fill
measured from the top of the GSF unit. Backfill exceeding 18 inches requires venting at the far end of the
trench. Use well graded native soil fill that is clean, porous and devoid of large rocks. Do not use wheeled
equipment over the system. A light track machine may be used with caution, avoiding crushing or shifting
of pipe assembly. Divert surface runoff from the Effluent Disposal Area, (EDA). Finish grade to prevent
surface ponding. Topsoil and seed system area to protect from erosion.
1.8 ADDITIONAL FACTORS EFFECTING RESIDENTIAL SYSTEM SIZE: Homes with expected higher
than normal water usage may consider increasing the septic tank volume as well as incorporating a multiple
compartment septic tank. Consideration for disposal area may be up-sized for expected higher than normal
water use.
For example.
• Luxury homes, homes with a Jacuzzi style tubs, and other high use fixtures.
• Homes with known higher than normal occupancy.
1.9 GARBAGE DISPOSALS: The use of a garbage disposal is not recommended as they can cause septic
system problems by generating an increased number of suspended solids, grease and nutrients.
However, if such units are proposed to be used, other measures should be taken to mitigate the increased
nutrients to the field. Increasing the septic tank size from minimum requirements, tanks placed in series
and upsizing the field are helpful in contesting the increased load. In addition,an effluent screening device
is recommended.
NOTE: Eljen requires the use of septic tank outlet effluent fitters on all systems. Filters with higher filtration
are recommended for systems with garbage disposals.
1.10 FILL SYSTEM: Fill systems are systems in which the sand soil interface is directly on the native soil.
1.11 SEPTIC TANKS: Many designers are now specifying dual compartment tanks for all their systems.
Eljen supports this practice as it helps to promote long system life by reducing TSS and BOD to the effluent
disposal area. Gas baffles and/or effluent filters are also required.
1.12 SEPTIC TANK FILTERS: Septic tank effluent filters are REQUIRED on the outlet end of septic tank.
Filter manufactures require that filters be cleaned from time to time.Ask your installer or designer for specific
cleaning requirements based on the type or make of the filter installed. Eljen requires the septic tank to be
pumped every three years or as needed which would be a good time to check and conduct fitter
maintenance.
1.13 SYSTEM VENTING: It is strongly recommended to vent all systems that are over 18" below finished
grade and systems beneath any surface condition that would not allow for surface air exchange with the
system. See Section 7.0 for a more detailed explanation of venting GSF products.
1.14 VERTICAL SEPARATION TO GROUND WATER OR LIMITING LAYER: Separation distance is
measured from the restrictive layer to the bottom of the sand soil interface and must comply with state
and/or local requirements.
2020 North Carolina Design&Installation Manual Page 6 www.eijen.com
1 .0 Design and Installation
1.16 NUMBER OF GSF MODULES REQUIRED: Residential systems use a minimum of six (6) A42
modules per bedroom, See Section 1.16 for more information on systems sizing.
1.16 GSF SYSTEM LOADING RATES:
TABLE 2: TRENCH LOADING RATES
SOIL SOIL TEXTURE CLASSES TRENCH LIAR(GPD/ft2)
GROUP (USDA CLASSIFICATION) NC STATE NSF-40 TS-1
LTAR
Sands(With S or PS structure
and clay mineralogy) 1.2-0.8 1.6- 1.1 2.4- 1.6
Coarse Loams(With S or PS
II 0.8-0.6 1.1-0.8 1.6- 1.2
structure and clay mineralogy)
Fine Loams(With S or PS
III 0.6-0.3 0.6-0.3 1.2-0.6
structure and clay mineralogy)
Clays(With S or PS structure
IV 0.4-0.1 0.4-0.1 0.8-0.2
and clay mineralogy)
Notes:
Treatment and Dispersal (T&D) loading rates reflect a 25% reduction in trench area for Group I & II soils.
TS-1 loading rates reflect a 50% reduction in trench area.
TABLE 3: BED LOADING RATES
BED LTAR(GPD/ft2) MINIMUM MINIMUM
SOIL SOIL TEXTURE CLASSES LENGTH TO
GROUP (USDA CLASSIFICATION) NC STATE NSF-40 TS-1 WIDTH A425PER
LTAR RATIO BEDROOM
Sands(With S or PS structure
1.2-0.8 1.1-0.7 1.6- 1.1 2:1 6
and clay mineralogy)
Coarse Loams(With S or PS
II 0.8-0.6 0.7-0.5 1.1-0.8 3:1 8
structure and clay mineralogy)
Fine Loams(With S or PS
I11 structure and clay mineralogy) 0.6 0.3 0.4 0.2 N/A 3:1 10
Notes:
Loading rates reflect a 50% increase in bed size.
Treatment and Dispersal (T&D) loading rates reflect a 25% reduction in bed bottom area for Group I & II
soils.
Treatment and Dispersal (T&D) Bed systems have a maximum daily design flow of 600 GPD.
TS-1 loading rates reflect a 50% reduction in bed bottom area for Group I& II soils.
TS-1 Systems for"fill" sites are limited to 480 GPD design flow.
TS-1 Systems have a maximum daily design flow of 1,500 GPD.
2020 North Carolina Design&Installation Manual Page 7 www.eljen.com
•
2.0 Trench Installation Sizing and Guidelines
Trench Example:
House size: 4 Bedrooms
Soil Evaluation: Soil Group II; NC STATE LTAR 0.8
Design Flow: 120 gpd x 4 bedrooms= 480 gpd
Desired Effluent Quality Standard: Treatment and Dispersal (T&D)
Calculate Minimum Absorption Area
Lookup the desired effluent quality standard LTAR from Table 2:
SOIL SOIL TEXTURE CLASSES TRENCH LTAR(GPD/ft2)
GROUP (USDA CLASSIFICATION) NC STATE NSF-40 TS-1
LTAR
I I Coarse Loams(With S or PS 0.8 0.6 1 0 : 1.6 1.2
structure and clay mineralogy)
Trench Area: Design Flow_ Loading Rate
480 gpd+ 1.1 gpd/ft2=437 ft2
Calculate Number of Modules Required
Number of units required=Absorption Area+ 12 Square Foot Per Module
A42 units required
437 ft2+ 12 ft2/module= 36.4 Modules
Round to: 37 A42 Modules
2-Rows 38 A42 Modules, 2-rows of 19
Calculate Minimum Trench Length
A42: 37 Units x 4 ft/unit= 152 linear ft
Trench Width
A42: 3 ft
Final Dimension Layout
(Note: System layout and number of rows will vary based on site constraints)
A42
Min. Product Length 152 ft
(note: 6 inches of sand required at each end of trench which makes the minimum trench length 149 ft)
Trench Width 2 rows 3 ft wide
Min. Number of Units 38 A42 Units
Min. System Area 456 ft2
2020 North Carolina Design&Installation Manual Page 8 www.eljjen.com
2.0 Trench Installation Sizing and Guidelines
FIGURE 3: PLAN VIEW-A42 MODULES -TRENCH SYSTEM
6"_ SPECIFIED SAND 6"
. . . ... - -
"l.r--
2' o
PER DESIGN !,\i`:;\\\/\`i::,\�i` ��f �\ NATNE SOIL, \�\��\\\��,
3' o I .l_: I l i. ( . -I
LL
,6'
I
n'
FIGURE 4: SECTION VIEW-A42 MODULES-TRENCH SYSTEM - LEVEL SITE
SEED AND LOAM
MIN 12'OF GEOTEXT1LE
CLEAN FILL . FABRIC
T' :
lF.
NATIVE SOIL
T&D- I r SPECIFIED SAND i/���/\\� � �\. SPECIFIED SAND
"—24"----.1
36" - PER DESIGN —L 36"--..1
FIGURE 5: SECTION VIEW-A42 MODULES -TRENCH SYSTEM -SLOPING SITE
SEED AND LOAM
MIN 12"OF GEOTEXTILE .,.,,,77.-.N.77.7
CLEAN FILL . FABRIC
T 1 r, NATIVE SOIL
T&D-6" SPECIFIE SAND ��\\�\\` //\ F-17L-I
��%\\ �` s. \\ SPECIFIED SAND
�24"� -
- 36" PER DESIGN -I-- 36"
2020 North Carolina Design&Installation Manual Page 9 www.etjen.com
2.0 Trench Installation Sizing and Guidelines
1. Ensure all components leading to the GSF system are installed properly. Septic tank effluent filters are
required with the GSF system.
2. Determine the number of GSF Modules required using the trench sizing example.
3. Prepare the site. Do not install a system in saturated ground or wet soils that are smeared during
excavation. Keep machinery off infiltrative areas.
4. Plan all drainage requirements above (up-slope) of the system. Set soil grades to ensure that storm
water drainage and ground water is diverted away from the absorption area once the system is
complete.
5. Excavate the trench; scarify the receiving layer to maximize the interface between the native soil and
specified sand.
6. Minimize walking in the trench prior to placement of the specified sand to avoid soil compaction.
7. Place Specified Sand in one to two 6-inch lifts, compact each lift at a time. The compacted height
below the GSF module must be 6" for Treatment and Dispersal (T&D) systems and 12" for TS-I
systems. A hand tamping tool or vibrating compactor are both acceptable.
8. Place GSF modules with PAINTED STRIPE FACING UP,end to end on top of the specified sand along
their 4-foot length.
9. A standard 4-inch perforated pipe, SDR 35 or equivalent, is centered along the modules 4-foot length.
Orifices are set at the 4&8 o'clock position.The minimum dispersal length per row is 20',the maximum
dispersal length is 60'with gravity distribution and 100'with pressure distribution.
10. All 4-inch pipes are secured with manufacturers supplied wire clamps, one per module.
11. (Pressure Distribution Systems) Insert a pressure pipe(size per design and code) into the standard 4-
inch perforated pipe. The pressure pipe orifices are set at the 12 o'clock position as shown in Figure
9. Each pressure lateral will have a drain hole at the 6 o'clock position. Each pressure lateral shall
have a clean out at the end of the trench.
12. Cover fabric substitution is not allowed. The installer should lay the Eljen provided geotextile cover
fabric lengthwise down the trench, with the fabric fitted to the perforated pipe on top of the GSF
modules. Fabric should be neither too loose, nor too tight. The correct tension of the cover fabric is
set by:
a. Spreading the cover fabric over the top of the module and down both sides of the module
with the cover fabric tented over the top of the perforated distribution pipe.
b. Place shovelfuls of Specified Sand directly over the pipe area allowing the cover fabric to
form a mostly vertical orientation along the sides of the pipe. Repeat this step moving down
the pipe.
13. Place 6 inches of Specified Sand along both sides of the modules edge. A minimum of 6 inches of
Specified Sand is placed at the beginning and end of each trench.
14. Complete backfill with a minimum of 12 inches of clean porous fill measured from the top of the module.
Backfill exceeding 18 inches requires venting at the far end of the trench. Use well graded native soil
fill that is clean, porous and devoid of large rocks. Do not use wheeled equipment over the system. A
light track machine may be used with caution, avoiding crushing or shifting of pipe assembly.
15. Divert surface runoff from the system. Finish grade to prevent surface ponding. Topsoil and seed
system area to protect from erosion.
2020 North Carolina Design&Installation Manual Page 10 www.eljen.com
•
•
3.0 Bed Installation Sizing and Guidelines
Bed Example:
House size: 4 Bedrooms
Soil Evaluation: Soil Group I; NC STATE LIAR 1.2
Design Flow: 120 gpd x 4 bedrooms= 480 gpd
Desired Effluent Quality Standard: TS-I
Calculate Minimum Absorption Area
Lookup the desired effluent quality standard LTAR from Table 3:
BED LTAR(GPD/ft2) MINIMUM MINIMUM
SOIL SOIL TEXTURE CLASSES LENGTH TO
GROUP (USDA CLASSIFICATION) NC STATE NSF-40 TS-1 WIDTH A42'S PER
LTAR BEDROOM
RATIO
Sands(With S or PS structure
I 1.2-0.8 1.1-0.7 (1.6-1.1) 2:1 6
and clay mineralogy)
Absorption Area: Design Flow+ Loading Rate
480 gpd + 1.6 gpd /ft2= 300 ft2
Determine Number of Modules Required
Lookup square foot per module from Table 3:
BED LTAR(GPD/ft2) MINIMUM MINIMUM
SOIL SOIL TEXTURE CLASSES LENGTH TO A42'S PER
GROUP (USDA CLASSIFICATION) NC STATE NSF-40 TS-1 WIDTH
LTAR RATIO BE, *OM
•
Sands(With S or PS structure40
1.2-0.8 1.1-0.7 1.6-1.1 2:1
and clay mineralogy)
Units Required = Bedrooms x Units per Bedroom
A42 units required
4 Bed x 6 Units per Bedroom = 24 A42s
Bed Length
2 Rows—Modules per Row
A42: 24 Units+2 Rows= 12 Modules per Row
round to 12 A42 Units
Bed Length: Modules x 4 ft/module+1
12 Modules x 4 ft/module+ 1 = 49 ft
Bed Width
Bed Width = Drainfield Size+ Bed Length
A42 units required
300 ft2+49ft= 6.1 ft
Round to 6.5 ft
Final Dimension Layout
(Note:System layout and number of rows will vary based on site constraints)
A42-2 Row
Bed Length 49 ft
Bed Width 6.5 ft
Minimum Number of Units 24 A42 Units
Units per Row 12 units per row
System Area 319 ft2
2020 North Carolina Design&Installation Manual Page 11 wwweljen.com
3.0 Bed Installation Sizing and Guidelines
FIGURE 6: PLAN VIEW-A42 MODULES - BED SYSTEM
Z_ a: .'t..::3� I 1 .»• ,V f
la
{--
in if3 _` `Lt J..W- -.j4,1`:.74�.� SPECIFIED IJfl1YD.-Af,`.a�''� u•���y .i 1 'S t.j' �.:..5�xi'��.�•.(.r:.`t�;:v c•
c i `,'�.�.:, = -:..xti• a:`.P .F r�Z` plc; a;. t? �.
(6 M s•l. . ...:1r-% t't .rr, tI may: i-) a''' ) "...T I l' -� f
n
do
8' IJ
FIGURE 7: SECTION VIEW-A42 MODULES- BED SYSTEM
SEED AND LOAM
/ / / /
MIN 1Z'OF
CLEAN FILL i&_ At
.,.
TS-I-12" SPECIFIED SAND
1.625' 3.25
6.5'
FIGURE 8: CROSS SECTION VIEW-A42 MODULES - BED SYSTEM - SLOPING
SITE
/----SEED AND LOAM
\ ,\ \ .\ „ / i
MIN 12"OF
CLEAN FILL
T'
TS-I -12" SPECIFIED SAND '
.
r— 1.625' 3.25' J
6.5'
2020 North Carolina Design&Installation Manual Page 12 www.eljen.com
3.0 Bed Installation Sizing and Guidelines
1. Ensure all components leading to the GSF system are installed properly. Septic tank effluent filters are
required with the GSF system.
2. Determine the number of GSF Modules required using the bed sizing example.
3. Prepare the site. Do not install a system in saturated ground or wet soils that are smeared during
excavation. Keep machinery off infiltrative areas.
4. Plan all drainage requirements above (up-slope) of the system. Set soil grades to ensure that storm
water drainage and ground water is diverted away from the absorption area once the system is
complete.
5. Excavate the bed absorption area; scarify the receiving layer to maximize the interface between the
native soil and specified sand.
6. Minimize walking in the absorption area prior to placement of the specified sand to avoid soil
compaction.
7. Place Specified Sand in one to two 6-inch lifts, compact each lift at a time. The compacted height
below the GSF module must be 6" for Treatment and Dispersal (T&D) systems and 12" for TS-I
systems. A hand tamping tool or vibrating compactor is both acceptable.
8. Place GSF modules with PAINTED STRIPE FACING UP,end to end on top of the specified sand along
their 4-foot length.
9. A standard 4-inch perforated pipe, SDR 35 or equivalent, is centered along the modules 4-foot length.
Orifices are set at the 4 & 8 o'clock position.
10. All 4-inch pipes are secured with manufacturers supplied wire clamps, one per module.
11. (Pressure Distribution Systems) Insert a pressure pipe(size per design and code) into the standard 4-
inch perforated pipe. The pressure pipe orifices are set at the 12 o'clock position as shown in Figure
9. Each pressure lateral will have a drain hole at the 6 o'clock position. Each pressure lateral shall
have a clean out at the end of each module row.
12. Cover fabric substitution is not allowed. The installer should lay the Eljen provided geotextile cover
fabric lengthwise down the row, with the fabric fitted to the perforated pipe on top of the GSF modules.
Fabric should be neither too loose, nor too tight. The correct tension of the cover fabric is set by:
a. Spreading the cover fabric over the top of the module and down both sides of the module
with the cover fabric tented over the top of the perforated distribution pipe.
b. Place shovelfuls of Specified Sand directly over the pipe area allowing the cover fabric to
form a mostly vertical orientation along the sides of the pipe. Repeat this step moving down
the pipe.
13. Place 6 inches of Specified Sand along both sides of the modules edge. A minimum of 6 inches of
Specified Sand is placed at the beginning and end of each module row. A minimum of 12 inches of
Specified Sand is placed in between module rows.
14. Complete backfill with a minimum of 12 inches of clean porous fill measured from the top of the module.
Backfill exceeding 18 inches requires venting at the far end of the bed. Use well graded native soil fill
that is clean, porous and devoid of large rocks. Do not use wheeled equipment over the system. A
light track machine may be used with caution, avoiding crushing or shifting of pipe assembly.
15. Divert surface runoff from the system. Finish grade to prevent surface ponding. Topsoil and seed
system area to protect from erosion.
2020 North Carolina Design&Installation Manual Page 13 www.eljen.com
•
4.0 Pressure Mound Installation Guidelines
1. Ensure all components leading to the GSF system are installed properly. Septic tank effluent filters are
required with the GSF system.
2. Determine the mound dimensions using the design example.
3. Prepare the site. Do not install a system on saturated ground or wet soils that are smeared during
excavation. Keep machinery off infiltrative areas.
4. Plan all drainage requirements above (up-slope) of the system. Set soil grades to ensure that storm
water drainage and ground water is diverted away from the absorption area once the system is
complete.
5. Scarify the receiving layer to maximize the interface between the native soil and Specified Sand.
Minimize walking in the bed prior to placement of the Specified Sand to avoid soil compaction.
6. Place Specified Sand in two 6-inch lifts, compact each lift at a time. The compacted height below the
GSF module must be level at 12 inches. 6 inches may go into grade. A hand tamping tool or vibrating
compactor is both acceptable.
7. Place GSF modules with PAINTED STRIPE FACING UP,end to end on top of the specified sand along
their 4-foot length.
8. A standard 4-inch perforated pipe, SDR 35 or equivalent, is centered along the modules 4-foot length.
Orifices are set at the 4 & 8 o'clock position.
9. All 4-inch pipes are secured with manufacturers supplied wire clamps, one per module.
10. (Pressure Distribution Systems) Insert a pressure pipe(size per design and code) into the standard 4-
inch perforated pipe. The pressure pipe orifices are set at the 12 o'clock position as shown in Figure
9. Each pressure lateral will have a drain hole at the 6 o'clock position. Each pressure lateral shall
have a clean out at the end of each module row.
11. Cover fabric substitution is not allowed. The installer should lay the Eljen provided geotextile cover
fabric lengthwise down the row, with the fabric fitted to the perforated pipe on top of the GSF modules.
Fabric should be neither too loose, nor too tight. The correct tension of the cover fabric is set by:
a. Spreading the cover fabric over the top of the module and down both sides of the module
with the cover fabric tented over the top of the perforated distribution pipe.
b. Place shovelfuls of Specified Sand directly over the pipe area allowing the cover fabric to
form a mostly vertical orientation along the sides of the pipe. Repeat this step moving down
the pipe.
12. Place a minimum of 6 inches of Specified Sand along both sides of the modules edge. A minimum of
6 inches of Specified Sand is placed at the beginning and end of each module row. A minimum of 12
inches of Specified Sand is placed in between module rows.
13. Complete backfill with a minimum of 12 inches of clean porous fill measured from the top of the unit.
Backfill exceeding 18 inches of the unit requires venting at the far end of the bed. Use well graded
native soil fill that is clean, porous and devoid of large rocks. Do not use wheeled equipment over the
system. A light track machine may be used with caution,avoiding crushing or shifting of pipe assembly.
14. Divert surface runoff from the system. Finish grade to prevent surface ponding. Topsoil and seed
system area to protect from erosion.
2020 North Carolina Design& Installation Manual Page 14 www.eljen.com
5.0 Dosing Distribution Guidance
5.1 PUMP DISTRIBUTION BOX: Specify an oversized distribution box for pumped systems. Provide
velocity reduction in the D-box with a tee or baffle. Set D-box invert higher than invert of perforated pipe
over GSF modules. If the absorption area is installed deeper than 18 inches, the system must be vented.
See section 7.0 of this manual for detailed information on venting of systems.
5.2 DOSING DESIGN CRITERIA: Dosing volume must be set to deliver a maximum of 3 gallons per A42
Module per dosing cycle. Head loss and drain back volume must be considered in choosing the pump size
and force main diameter.
6.0 Pressure Distribution Guidance
Standard procedures for design of pressure distribution networks apply to the GSF filter. A minimum orifice
size of 1/8 to 1/4 inch shall be maintained. A%inch diameter drain hole is required at the 6 o'clock position
of each pressure lateral for drainage purposes. The lateral pipe network (size per design and code) is
placed within a standard 4-inch perforated pipe. The perforation in the 4-inch outer pipe are set at the 4
and 8 o'clock position, the drilled orifices on the pressure pipe are set to spray at the 12 o'clock position
directly to the top of the 4-inch perforated pipe as shown below.
FIGURE 9: PRESSURE PIPE PLACEMENT
•
4"DIAMETER PRESSURE CLEAN PERFORATED PIPE
PIPE
4"END CAP WITH
LOW PRESSURE PIPE HOLE DRILLED
(LPP)
010.
- -
WAIL --
PRESSURE PIPE CROSS SECTION FOR ALL APPLICATIONS
4"DIAMETER PERFORATED PIPE
LOW PRESSURE PIPE
2020 North Carolina Design&Installation Manual Page 15 www.eljen.com
6.0 Pressure Distribution Guidance
FIGURE 10: PRESSURE CLEAN OUT
6-8"DIAMETER
LAWN SPRINKLER
FINISHED GRADE
THREADED
LATERAL ENDS AT LAST 4"PERFORATED PIPE CLEANOUT PLUG
ORIFICE WHERE VARIABLE 4"END
LENGTH CLEANOUT BEGINS CAP
LONG WEEPOR
TWO 45 DEGREE
EE BENDS
SAME DIAMETER
AS LATERAL
-�— DISTRIBUTION LATERAL LATERAL CLEANOUT -a--'
FIGURE 11: CONTOURED TRENCH PRESSURE DISTRIBUTION
PRIOR TO PLACING FABRIC COVER, HAND — STANDARD FITTING(S) —
SHOVEL SPECIFIED SAND IN THESE AREAS
4"PERFORATED PIPE
11
:4 DRAIN OPENING
•
% AT 6 O'CLOCK
CAP END
�: OF 4"PIPE
PRESSURE PIPE(SIZE PER DESIGN/CODE)
PRESSURE PIPE EXTENDS THRU END�`
CAP,AND IS EXTENDED FOR CLEAN OUT
Ni
GSF Pressure Distribution trench placed on a contour or winding trenches to maintain horizontal separation
distances.
7.0 System Ventilation
7.1 SYSTEM VENTILATION: Air vents are required on all absorption systems with more than 18 Inches
of cover material as measured from the top of the GSF module to finished grade. This will ensure proper
aeration of the modules and sand filter. The GSF has aeration channels between the rows of GSF modules
connecting to cuspations within the GSF modules. Under normal operating conditions, only a fraction of
the filter is in use, The unused channels remain open for intermittent peak flows and the transfer of air.
Home plumbing operates under negative pressure due to hot water heating the pipes and reducing the
density of air in the house vent. As hot air rises and exits the home, it must be replaced by air from the
GSF. To maintain this airflow and fully aerate the GSF system, it is important that air vents are located only
on the distal end of the GSF pipe network.
2020 North Carolina Design&Installation Manual Page 16 www.eljen.com
7.0 System Ventilation
7.2 VENT PIPE FOR LOW PRESSURE DISTRIBUTION SYSTEMS: If the system is a low-pressure
distribution system with greater than 18 inches of cover, ensure that the LPP clean outs are located in the
vent for easy access.
FIGURE 12: GRAVITY VENTING
VENTED CAP
•
\/ \ DIAMETER PIPE ORATED 4"
0 0
SPECIFIED EDGE OF LAST MODULE
SAND ' 1 T
�•`._...ice _ _.�,., -..�:L,:.:.._a....,
FIGURE 13: PRESSURE CLEAN OUT PRESSURE DOSED SYSTEMS
THREADED CAP
ifite
LOW PRESSURE PIPE ///\j\� I \�\\/\
/ I` � /\
j, i \\ /
j I %\\\ 4"DIAMETER PIPE
•• ,
SPECIFIED SAND ------ - EDGE OF LAST MODULE
2020 North Carolina Design&Installation Manual Page 17 www.eIjen.com
•
7.0 System Ventilation
7.3 VENTILATION PLACEMENT: In a GSF system, the vent is usually a 4-inch diameter pipe extended
to a convenient location behind shrubs, as shown in the figure below. Corrugated pipe may be used. If
using corrugated pipe, ensure that the pipe does not have any bends that will allow condensation to pond
in the pipe. This may close off the vent line. The pipe must have an invert higher than the system so that
it does not drain effluent.
FIGURE 14: GSF WITH 4" VENT EXTENDED TO CONVENIENT LOCATION
SHRUB
V ,
MOUNDED BACKFILL OVER MODULES
CLEAN BACKFILL
GSF MODULES
COVER FABRIC NOT SHOWN OVER DISTRIBUTION PIPE AND MODULES
8.0 System Maintenance and Sampling Requirements
The purpose of this section is to help provide an easy and effective way to monitor and sample Eljen Onsite
Sewage System. Installing an Eljen Sampling and Collection Unit will allow you to sample your Eljen GSF
System and meet the requirements listed below. If you have any questions pertaining to any part of this
document or regarding Eljen products in general, please call our Technical Services Department at 1-800-
444-1359.
OWNER RESPONSIBILITIES:
• Maintain an operator: At all times, a certified service provider should be retained for routine
maintenance and inspections.
• Keep a log: A log must be maintained on any services or inspections. Requirements for log entries
are in the section below, Operators Responsibilities.
• Keep operators manual on the premises for transfer to next owner.
• Schedule routine Operator visits.
o All sampling shall be done in accordance with Rule .1970(n) (3)and (5).
o Sampling is required annually.
o Influent for all systems shall be analyzed for BOD5 and TKN.
o Treatment and Dispersal(T&D) systems shall have effluent tested for CBOD5 and TSS.
o TS-I systems shall have effluent tested for CBOD5, TSS, NH4-N and fecal coliforms.
OPERATOR RESPONSIBILITIES:
• Keep a log for the system
o Results of all testing and sampling
o Reportable incidents
o Maintenance, corrective actions, and repair of system components
o Sludge or solids removal
o Date and time reports were made and delivered to the system owner
2020 North Carolina Design 8 Installation Manual Page 18 www.elien.com
9.0 Sampling Port
FIGURE 15: PARTS AND DEVICES
Field Sampling Parts to be installed with system:
Sampling Pan
36"
PLAN VIEW
711
O 24" 90° FITTING
r 36„ 11
SIDE VIEW
2"
10.0 Sampling Port Design
1. Determine the collection pipe and observation & sampling port placement in the system. We
recommend three samplers are place in the same row. One sampler under the first module,one under
the last, and one in the middle.
FIGURE 16: OBSERVATION AND SAMPLING PORT PREPARATION PLAN VIEW
1 I GSF I 1 I 1
—PIPE
SAMPLER U U
2. Carefully lay out the system area and boundaries.
3. Prepare the site. Excavate a trench to the design elevation for the system. Note: this includes the 12
inches of Specified Sand.
2020 North Carolina Design&Installation Manual Page 19 www.eijen.com
11 .0 Sampling Port Installation
1. In the excavated trench, place Specified Sand in a 3-inch lift and stabilize.
FIGURE 17: PLACE BASE SAND
,,\
2. Place the three sampling pans level in the trench at the beginning, middle and end of the trench. The
samplers should be centered underneath where the GSF will be placed.
FIGURE 18: PLACE SAMPLERS ON SAND
I
l
rir
SAMPLING PORT LAID LEVEL
2020 North Carolina Design&Installation Manual Page 20 www.eljen.com
11.0 Sampling Port Installation
3. Fill Pan with pea gravel.
FIGURE 19: PLACE PEA GRAVEL IN PAN
%` /
\ \\\\
\./\
PEA GRAVEL
4. Place the specified sand to required depth.
FIGURE 20: COMPLETE PLACING SPECIFIED SAND
,•�` A
�f, /\
SPECIFIED
SAND
5, Stabilize the Specified Sand height below the GSF module to 12 inches. A hand tamper or vibratory
compactor is sufficient to stabilize the Specified Sand below the GSF modules. Check the zero grade
of the top of the Specified Sand using a flat piece of lumber and a carpenter's level and/or a laser before
placing the modules.
6. After the GSF modules have been installed, carefully place backfill over the modules, followed by loam
to complete a total minimum depth of 12 inches as measured from the top of the module. Backfill
material shall be a well graded sandy fill; clean, porous, and devoid of rocks.
2020 North Carolina Design&Installation Manual Page 21 www.eljen.com
11 .0 Sampling Port Installation
FIGURE 21: COMPLETE BACKFILL
MINIMUM 17'BACKFILL
7. Cap or place irrigation box over top of pipe. Mark so that service provider can find for sampling. •
8. Divert surface runoff and finish grade to prevent surface ponding. Seed, loam, and protect from
erosion.
12.0 Sampling Port Sampling
1. Sampling can be done in two days. Ensure there is power onsite with appropriate amount of extension
cord for your shop-vac.
2. Empty the sampler the day prior to sampling. Clean with a water solution containing 200 ppm bleach.
3. The following day, ensure your sampling beaker is clean and ready to receive sample.
4. Uncap or open irrigation box.
5. Retrieve sample with clean suction device.
6. Cap or close irrigation box.
7. Return sample to lab for testing in a cool storage container.
2020 North Carolina Design&Installation Manual Page 22 www.eljen.com
L_ COMPANY HISTORY
Established in 1970, Eljen Corporation created the world's first
prefabricated drainage system for foundation drainage and
'-erosion control applications. In the mid-1980s, we introduced
our-Geotextile Sand Filter products for the passive advanced
treatment-of onsite wastewater in both residential and commercial
applications.•Today, Eljen is a global leader in providing innovative
products and solutions for protecting our environment and
public health. 11
COMPANY PHILOSOPHY
Eljen Corporation is committed to advancing the onsite industry
through continuous development of innovative new products,
delivering high quality products and services to our customers
at the best price, and building lasting partnerships-with our
employees, suppliers, and customers.
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CORPORATION
90 Meadow Road, Windsor, CT 06095 • Tel:800-444-1359 • Fax: 860-610-0427
www.eljen.com
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*Copyright Ellen Corporation Printed in USA on recycled paper