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Y r - r - • r Ir - r - r r r �.r !r _r - - r r rr • • r r,- -! x y x •- r k - k r �• i r:r. i y-. r � -� ., !_• # •,r _iYr - ! *® r - - r -; i r • - r _ !- irr � r r i m !ri® r r ! _ . r �� I -� r rr, ! �*` 1l ♦- -.+ �' � �- ! - - ;- w- r r r - •- •- ! - r • _ • -! _ - •wkill mall-jo100:11-! ! e r r #r �r R� * - r- r - +r r - �r r .' r - - r - - - r r r • r r -r r _ , � r r• • r, lRr,i �- - r - f - r PONDING MAXIMUMIW""�_ s r FILTER MEDIA HOMOGENOUS SOIL MIX IL FILL SMEDIA MIX.- 85�88% WASHED SAND r- CLAY) 3-5% ORGANICS (PEAT MOSS, PINE BARK) P—INDEX FOR SOIL MEDIA SHOULD RANGE BETWEEN 10 AND 30 t WASHED r: SAND *• (CHOKING STONE) WASHED it LAYER AROUND UNDERDRAIN CENTER UNDERDRAIN IN GRAVELLAYER 2' PLUS DISTANCE • SEASONAL WATER TABLE ELEVATION IN SITU SOIL O,,., LOAM HYDROLOGIC SOIL GROUP B — SOIL SURVEY CLOSEST SOIL BORING PUTS GROUND . ! r r BELOW WATER +* TASKS - MAINTENANCE NOTES N�;RIENTS IN RUNOFF OFTEN CAUSE BIORETETION VEGETATION TO FLOURISH * M N .. r r O• it r DESIRED AESTHETIC APPEAL FREQUENCY MULCHING 1-2 TIMES/YEAR IIIUNIFORMLY PLACED, DOUBLE O. *' •_i:r r HARDWOOD MULCH L:• DEEP MULCH REMOVAL 1 TIME 2-3 YEARS MULCH ACCUMULATION REDUCES AVAI LABEL WATER STORAGE VOLUME. t ! y. f � r •.�� . k r -srIC - DROUGHTY,,. MAY REQUIRED. AFTER ESTABLISHMENT FERTILIZATION INITIALLY A • . t ® VEGETATION ONE TIME SPOTFERTILIZATION REMOVER AND REPLACE WITHIN THE - FIRSTYEAR10 PERCENT OF TS MAY DIE. SURVIVAL RATES L.. x� , TASKS INCLUDE TRASH COLLECTION, SPOT WEEDING, AND REMOVING MULCH MISCELLANEOUS UP PROM OVERFLOW DEVICE. i r r- i�� • r- • - r r b � . - r - • r r y - k • � • r �r r• r r r rl - • a: r r r r ■ A Operation Maintenance Provisions for Bioretention Areas BMP Element: Potential Problem: How to Remediate the Problem.: The entire $MP Trash/debris is present. Remove the trash/debris, The perimeter of the Areas of bare soil and/or Regrade the sail if necessary to remove ioretention cell erosive gullies have formed. the then plant a round cover and gully, water until it is established. Provide lime and a one-time fertilizer application. The inlet device: pipe, The pipe is clogged (if Unclog the pipe. Dispose of the stone verge or swale applicable). sediment off -site. The pipe is cracked or Replace the pipe. otherwise damaged (if applicable). Erosion is occurring in the Regrade the swale if necessary to swale (of applicable). smooth it over and provide erosion control devices such as reinforced turf matting or riprap to avoid future {problems with erosion. Stone verge is clogged or Remove sediment and clogged covered in sediment (if stone and replace with clean stone. applicable). The pretreatment area Flow is bypassing Regrade if necessary to route all pretreatment area and/or flow to the pretreatment area. ,gullies have formed. Restabilize the area after grading,. Sediment has accumulated Search for the source of the to a depth greater than three sediment and remedy the problem inches, if possible. Remove the sediment and restabilize the pretreatment area. Erosion has occurred. Provide additional erosion protection such as reinforced turf matting or riprap if needed to prevent future erosion problems. Weeds are present. Remove the weeds, preferably by hand. The bioretention cell. Best professional practices Prune according to best professional vegetation show that pruning is needed practices. to maintain optimal plant health. Plants are dead, diseased or Determine the source of the dying. problem: soils, hydrology, disease; etc. Remedy the problem and replace plants. Provide a one-time fertilizer application to establish the ground cover if a soil test indicates it is necessary. If sod was used, check to see that it was not grown on clay or impermeable soils" Replace sod if necessary. Tree stakes/wires are present Remove tree stake/wires (which six months after planting. can kill the tree if not removed). The bioretenti on cell: Mulch is breaking down or Spot mulch if there are only soils and mulch has floated away. random void .;ices. Replace whole mulch layer if necessary. Remove the remaining much and replace with triple shredded hard wood mulch at a maximum depth of three inches. Soils and/or mulch are Determine the extent of the clogged with sediment. clogging - remove and replace eitherjp y ust the to layers or the entire media as needed. Dispose of the spoil in an appropriate tiff -site location. Use triple shredded hard wood mulch at a maximum depth of three inches. Search forthe f source o the e sediment and remedy. the problem if possible. p An annual soil test shows o Dolomitic lime shall be applied as pp that pH has dropped or recommended perthe soil test and heavy metals have toxic soils shall be removed, accumulated in the soil disposed of properly and replaced media. with new media, planting The underdrain system dogging has occurred. Wash outthe underdrain system. (if applicable) The drop inlet Clogging has occurred. dean out the drop inlet. Dispose of the sediment off -site. The drop inlet is damaged Repair or replace the drop inlet. The receivingwater Erosion or other signs of g Contact the NC Division of Water damage have occurred at the g Quality 441 Oversight Unit at 919- � y g outlet. 7 8-1786. To N56qr ALL PAR77ES ARE IN " I I OF / !i. , OF CONSMICTIONat/ BEM- C01VSTRUC77aV w MEMO d ',I' C) CD C\J CZ 0 cc q III ` 't . 1649YR�*P*x '\A CAS , * 11 r ° r rx P HAROLD J. MARYM CONSULTING ENGINEER 4124 WANDERING LN. N.E. HICKORY, NC 28601 PHONE (8) 320-3367 PROJECT PHASE Permit Dr s PROJECT 000 .. SHE T NUM