HomeMy WebLinkAboutCBPR-09-2017-27349.TIF TRANSMITTAL STATEMENT
DATE. 26-Apr-18
Wright 209 1st Ave.,South PROJECT NO. 101-055
Conover,NC 28613 ATTENTION:
(828)465-2205 OFFICE
-
Associates
ENGINEERS & SURVEYORS
TO Steven Price
Cat. Co. Environmental Health
Newton, NC 28658
WE ARE SENDING YOU : X ATTACHED UNDER SEPARATE
COVER
THE FOLLOWING ITEMS:
SHOP DRAWINGS x OTHER
PRINTS
PLANS
SAMPLES
SPECIFICATION
COPY OF LETTER
COPY OF MAP
CHANGE ORDER
COPIES DATE NO. DESCRIPTION
1 Hart Square Plans-revised for septic system
1 Revised calculations to modify flows on Saturday
and Sunday
THESE ARE TRANSMITTED AS BELOW:
FOR APPROVAL APPROVED AS NOTED
X FOR YOUR USE APPROVED AS SUBMITTED
AS REQUESTED RETURNED FOR CORRECTION
FOR REVIEW AND COMMENT FOR BIDS
REMARKS:
SIGNED: RECIL H. WRIGHT, PE
COPIES File
Hart Square
Septic System
Design Criteria
Catawba County
4/16/2018 revised 4/26/2018
Flows:
Q Waste Generator Units Quantity Unit Flow Total Flow Sub-totals
Sunday Classrooms persons 5 0
events persons 300 10 3000
staff persons 5 25 125 3125
Monday Classrooms persons 0 5 0
events persons 0 10 0
staff persons 0 25 0 0
Tuesday Classrooms persons 200 5 1000
events persons 0 10 0
staff persons 25 25 625 1625
Wednesday Classrooms persons 200 5 1000
events persons 0 10 0
staff persons 25 25 625 1625
Thursday Classrooms persons 0 5 0
events persons 0 10 0
staff persons 25 25 625 625
Friday Classrooms persons 0 5 0
events persons 0 10 0
staff persons 25 25 625 625
Saturday classrooms persons 0 5 0
events persons 300 10 3000
staff persons 25 25 625 3625
Weekly Total 11250 11250
Equalization, trench length and dosing:
Equalization cycle = 7 days
Equalized Flow = 1607.14 gpd
LTAR = 0.25 gpd/sf
Area of trench = 6429 sf
Length of line = 2143 ft
25% reduction length 1607 ft(inflitrator or equal)
Total Dose volume = 98 CF
(70%of 4" line volume) 734 gallons 1il►l1rf�
No of fields 2 �.,`•+,'�
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Lineal ft per field 804 t",."-.1:4,•••
No. of lines 8 ;
Wednesday 1625 1607 18 2339
Thursday 625 1607 768 1571
Friday _ 625 1607 982 0
Totals 11250 11250
Pump tank Sizing
Min pump submergence 12 in
tank volume per inch 125 gallons per inch
Volume for pump submergence 1500 gallons
Dose volume 1607 gallons
Equalization volume 1607 gallons
Emergency storage volume 1607.14 gallons
Total Minimum volume 6321 gallons
Use 7000 gallons
Septic Tank Sizing
Volume = V=0.75Q + 1125
Q = 1607.14 gallons per day
Volume = 2330.36 gallon
Use 3000 gallon
Dosing criteria:
Dosing volume 1607 gallons
Dose interval 3 times per day
hours in cycle 8 hours
Dose volume per interval 536 gallons
Dose rate 50 gallons per minute
Dose time per interval 11 minutes
minutes pump on per cycle 11 minutes
Hours off per cycle 7.82 hours
Septic tank and pump tank shall bear the NCDENR approval stamp
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