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Home My WebLink AboutSW6170901 - Oak Hill Living Center (2)Oak Hill Living Center W A • 'fir ' Angier, NC HARNETT County Cape Fear River Basin NCDENR I RAINFALL & CALCULATION DATA ' Project County. HARNETT Project City Angier Rainfall Source Raleigh Loaded Rainfall- Raleigh Design Storm: P90 Calculation Method Discrete SCS Method, Pre - Post (Minimum Design Storm = P90 for non -SA, 1 -yr, 24 -hr for SA) Storm Event Depth (inches) First Flush / WQV 1 00 P P95 1 41 1 87 1 -yr, 24 -hr 2.88 2 -yr, 24 -hr 3 48 10 -yr, 24 -hr 5 07 25 -yr, 24 -hr 602 50 -yr, 24 -hr 678 100- , 24 -hr 7.56 NOTE. Please use the Storm -EZ calculation sheets to document the stormwater design and create the O&M Agreement Highlighted Storm is Design Storm I PROJECT INFORMATION Total Property Area 12.46 acres Total Coastal Wetlands Area 000 acres Total Surface Water Area 1 0.00 lacres Complete the breakdown of impervious area for the project Basin Information Entire Site Receiving Stream name Black River Stream Class Supporting,Sw Stream Index Number Total Drainage Area 542,829 On -Site Drainage Area (sf) 542,829 Offsite Drainage Area (sf) 0 Proposed Impervious Area (sf) 114,880 % Impervious Area total 21% Impervious Surface Area Entire Site On -Site Buildings/Lots (sf) 10,115 On -Site Streets sf On -Site Parking (sf) 13,320 On -Site Sidewalks (sf) 1,640 Other On -Site (sf) 0 Future (sf) 0 Off-site sf Existm BUA s 89,805 Total 114,880 Total impervious Area 264 1 acres Project % impervious area 21% ALL AREAS ARE IN SQUARE FEET Use Worksheet Data? Yes Data in italics is derived from application forms and land use data worksheets and cannot be changed by user SLi - 5 L�i� STORM -EZ 8/23/2017 Version 1 4 Project Data Page 1 of 1 Pre -Development Land Use Note Enter BUA Draining to Permeable Pavement Below User Defined Drainage Oak Hill Living Center Q�oAngier, NC HARNETT County � Cape Fear River Basin NCDENR Drainage Area # I ] of F-1-1 G PRE -DEVELOPMENT LAND USE CALCULATIONS Arra HSG Land -use CN s acres (st) (sf) Onmr) (%) (in) pn) pn) B Impervious 98 89,805 206 1654% B Pasture or Open Space 61 379,124 870 6984% B Woods 55 73,900 170 1361% Total Site Area 1 542,829 Subtotal 542,829 1246 000 acre -inches = Existing Permeable Pavement (Infiltration): SCM # Description 100 SCM # 150 Existing Green Roofs: HSG Soil Gravel Total Orifice Orifice Gravel Pavement Area Additional BUA Infiltratio Height n Rate Void Space Depth Dia. BUA % Has Synthetic Liner? D.S. BMP (st) (sf) Onmr) (%) (in) pn) pn) 1246 acres Permeable Pavement + Addibonal BUA 0 000 acres Green Roofs 0 000 DSD I PAW Area DS SCM # I Notes I I 141 I I I I 000 I I __ 1 Pre -Development SCMs: Land Use Summary., Area sf. 63,782 Drainage Area From Land Use Tables 542,829 1246 acres Permeable Pavement + Addibonal BUA 0 000 acres Green Roofs 0 000 acres Preserved Surface Waters 8 Non -Coastal Wetlands -005 acre -inches = 000 acres Preserved Coastal Wetlands 1 000 arra-inches = 000 acres Total Site Area 1 542,829 1246 acres SCM # 20( Rainfall Volume = WQVolume Provided 63,782 Drainage Area Runoff Reduction Components: Im Oen s s Downstream SCM Type -1511 acre -inches = HSG 89805 453024 SCM Dry Detention 12326 B 36455 1 49200 -005 acre -inches = Rainfall Volume = 1757 acre -inches = 63,782 cf Runoff Reduction Components: Natural Infiltration & ET = -1511 acre -inches = -54,832 cf Disconnected Impervious Surfaces = 000 acre -inches = 0 Cr SCM Infiltration = -005 acre -inches = -181 cf Permeable Pavement Infiltration = 000 arra-inches = 0 cf Green Roof ET = 000 arre-inches = 0 cf Post Filtration Discharge = 000 acre -inches = 0 cf Total Runoff Reduction = -1516 acre -inches = -55,013 cf SCM Treatment: Treated SCM Outflow -050 acre -inches = -1,812 of Untreated Surface Runoff= 1.92 acre -Inches = 6,957 cf The Pre -Development project area contains 89805 sf of built upon area, resulting in an overall density of 16.64%. STORM -EZ 8/23/2017 Version 1 4 Pre -Development Page 1 of 1 Oak Hill Living Center s Angier, NC HARNETT County ®� Cape Fear River Basin NC!DENR Drainage Area # 1 of 1 POST -DEVELOPMENT LAND USE CALCULATIONS Parmnahla pavamant. scm N 600 Aroa facrcal Rotrofit? I Do SnsMt #em I common. esidendal Lot CN Calculator Excludm R/W and dedicated o n space Lot Area 0 of Lots Max Imp I Lot % I.P. Woods /Lot Open Spew I Lot Avg Lot Sh (st) I (ac) (sf) 1 (sQ I (st) 000 Land Excluded or Partially FDreluded Imm Volume Calculations sl too Surface Waters & Nan -Coastal Wetlands 00 00 Coastal Wetlands 0 000ro Total Sito Aa• 642,829 12A6 e summary: Total InfittratIon Pavemord Aroa Additional BUA Void Spaco Grovol Hes Or11iw OntiCOL Rainfall Volume = Infilret[on Datontlon HSG Pvmt Typo Rato Dopth Syne!? Dia Holght Natural Infiltration & ET = -1442 arra-inches = -52,346 urron Check Chock (at) (acres) (et) (acres) (I—) I (%) (In) (m) (m) cf Permeable Pavement Infiltration = 000—"nch.s = 0 cr - 000 eom-imha. = 000 - 000 -T- No - -014 ave -inches = - of Total Runoff Reduction = Aroa facrcal Rotrofit? I Do SnsMt #em I common. esidendal Lot CN Calculator Excludm R/W and dedicated o n space Lot Area 0 of Lots Max Imp I Lot % I.P. Woods /Lot Open Spew I Lot Avg Lot Sh (st) I (ac) (sf) 1 (sQ I (st) 000 Land Excluded or Partially FDreluded Imm Volume Calculations sl too Surface Waters & Nan -Coastal Wetlands 00 00 Coastal Wetlands 0 000ro Total Sito Aa• 642,829 12A6 e summary: Rainfall Volume = 1757 acre -inches = 63,782 of Runoff Reduction Components, Natural Infiltration & ET = -1442 arra-inches = -52,346 c/ Disconnected Impervious Surfaces = -006 eve -Inches = -200 cf SCM Infiltration = -126 e—ches = -4,573 cf Permeable Pavement Infiltration = 000—"nch.s = 0 cr Green Roo (ET= 000 eom-imha. = 0 c1 Post Filtration Discharge = -014 ave -inches = -502 of Total Runoff Reduction = -15 87 acre -inch.. _ •57,621 cf STORM -EZ 8/23/2017 Versmn 14 Post Development Page 1 of 2 Oak Hill Living Center • Angier, NC HARNETT County Cape Fear River Basin Drainage Area # 1 Of i POST-DEVELOPMENTILAND USE CALCULATIONS Treatment Treated SCM Outflow = -058 eve -Inches = -2,107 cf Untreated Surface Runoff = 112 acre -inches = 4,055 cf Pre -Development Runoff = 102 acre-mchcs = 6,957 cf Difference = -0 e0 acre orches = -2,903 Cf The Post -Development project area contains 114880 of of built upon area, resulting In an overall density of 21.16% AG`KP 1�q wA NCDENR STORM -EZ 812312017 Version 14 Post Development Page 2 of 2 Oak Hill Living Center Angler, NC HARNETT County ®*A Cape Fear River Basin NCDENR Drainage Area # 1 of 1 PROPOSED SIPS & STRUCTURAL RUNOFF VOLUME CONTROLS Enter only runoff volume below that will be infiltrated or drawn down over 2 to 5 days. Additional volume provided in devices should not be entered in this worksheet Drawdown time requirement applies to all storm events. offsde Impennous 0 sf Area Treated Drainage Total Post Im ervbus Pernous %of Total %of Total Storage Do— Area Inflow Inflow Irdiltratron5 Filtration Treated %of SCM SCM Ireporvrous Pervrous Volume stream SCM Volume Volume ET Outflow Outflow Volume x 114.880 1 427848 Area Area F— —(-f) 1 a (of) (of) (of) (cf) 1-111 Util¢ad 87025stlmpernous area enlared 121885sfopen spowentered 76% of total 28%otlotal compaiedto 114880Sftotal lmpervjaus compared to 427948 sfWal Impel— Pervrous open space ares area Runoff Fate Summary Rainfall Volume= 1757 acre4whes = 63,782 of Runoff Reduction Components, 1 12 acro -Inches 4,055 of Natural Infiltration & ET = -1442 aae-inches = 52,345 cf Disconnected Impervious Area= -006 aaeanches = -200 cf SCM Infiltration = -120 aaeanches = 4,573 cf Permeable Pavement Infiltration = 0 00 aaeanches = 0 of Green Roof ET = 000 aaeanches = 0 cf Post Filtration Discharge = -014 aaeanches = 502 cf Total Runoff Reduction = .1587 acre-mchos -57,621 of SCM Treatment Treated SCM Outflow = -058 --inches = -2,107 c1 Untreated Surface Runoff= 1 12 acro -Inches 4,055 of Pre -Development Runoff = 192 acre -Inches = 6,957 of Difference = -060 eaea thea = -2,903 of -VOLUME MATCHING ACHIEVED - The Post -Development project area contains 114880 at of built upon area, resulting in an overall density of 21 18% warnings Nate Large storage dewce5 such as wethdrydetention ponds, constructed wetlands, or Infiltra on basms may requve pond roulmg wlculauons The mulmg calculators should be provided to addition to Ws spreadsheet. STORM -EZ 8/2312017 Verson 14 Slonnwdter Controls Page 1 of 1 STORM -FS 8/23/2017 Verson 14 Rainfall Fate Graph Page 1 of 1 Oak Hill Living Center Angler, NC HARNETT County Cape Fear River Basin Drainage Area# 1 of 1 ®�A NC ENR FATE OF RAINFALL Select Storm P90 BASIC TREATMENT SCALE Conri lance Storm = P90 Storm - Rainfall Depth = 1 41 inches Basic Treatment Threshold VOLUME MATCHING SCALE P9��00Storm - Rainfall Depth = 1 41 Inches ONW Ma Volume Matching Threshold FATE OF RAINFALL GRAPHS l00% 90 6 70% E 6096 40%— X 3096 20% 1� Pre Development Fates Post Development Fates aax — 90% 11% — — - __ _ ___--_ ® IAhnnion and 17-55161d Treated Outflow from BM Ps-3294d Untreated surface Runoff-5327d •Pmt Rhration Oulflaw-Def •ane, Ylnfihratronby BM%3 329d •Permeable Pavement Nfiltrancm-ocl • Duonneded lmpervnm infilu. n-0ef •Green Roof Evapovampiranon-0if • Infituanonard ET 543324 � 30% — t0% Inflhrauon and ET-573WIf Treated Oudlowfram BMPs-3315d Untreated Sudace Runoff-2605d .Post,,, anon Oudiow-sold •Other •Infinrat—by BMPs-4824d • Permeable Pavement lnfihratlon -od •Deconneded lmpervaus l rfift—on-200d ■ Green Roof Evapotranspiratan-Od •mfihrauon and Er 52346d The"Fate plan of Ralnfa0' charts display fine hydrologic processes t0 which rainfall wlumes are subjected based on the combinabens of land use soil type and stormwater controls entered by the user The charts are designed 7d7= the stonnwaler In a form which Illustrates changes M the hydrologic cycle which result from urbanizatwn and various stoma water management strategies STORM -FS 8/23/2017 Verson 14 Rainfall Fate Graph Page 1 of 1 Oak Dill Living Center a Angier, NC HARNETT County Cape Fear River Basin ® Drainage Area # 1 of 1 NC®ENR ADDITIONAL CALCULATIONS ME OF CONCENTRATION CALCULATIONS: Pre -Development Length (ft) Slope (ft/ft) Surface Cover Ti (hrs) Sheet Flow Sheet Flow Shallow Flow Shallow Flow Flow Area Length (ft) Slope (ft/ft) n -value (ft') Wetted Perimeter (ft)Tr (hrs) Channel Flow Channel Flow Pre -development T,= 5.00min (Mmlmum 5 minutes) Post Development Length (ft) Slope (ft/ft) Surface Cover T, (hrs) Sheet Flow Sheet Flow Shallow Flow Shallow Flow. Channel Flow Channel Flow owrea Length (ft) Slope (ft/ft) n -value (ft2) Wetted Perimeter (ft) T, (hrs) Post -development T. 5.00 min (Minimum 5 minutes) CULATIONS: tpment P90 Analysis Area = 12.46 Acres (0.019 sq. miles) P95 1 -Yr I 2 -Yr 10 -Yr 25 -Yr Analysis Area = 12.46 Acres (0.019 sq. miles) 100 -Yr Q' (in) q„ (csm/m) 008 F.F. P90 P95 I 1 -Yr I 2 -Yr I 10 -Yr I 25 -Yr I 50 -Yr 100 -Yr all (1 1 00 1 141 1 1.87 1 288 1 348 1 507 1 6.02 1 678 756 = 0.08 1 012 1 0.19 1 053 1 0.82 1 1 77 1 242 1 2.98 357 d1= 80 74 70 67 67 66 66 65 65 tpment Q (cfs) F.F. P90 P95 1 -Yr 2 -Yr 10 -Yr 25 -Yr 50 -Yr 100 -Yr all (in) =I 1 00 1 1.41 1 187 1 288 1 348 1 507 1 6.02 1 678 1 796- 561 1 004 1 006 1 0.14 1 044 1 0.73 1 167 1 230 1 2.84 1 341_ ,t=1 76 1 70 1 67 1 65 1 65 1 65 1 64 1 64 1 64 1K FLOW CALCULATIONS: F.F. Pre -Development P90 Analysis Area = 12.46 Acres (0.019 sq. miles) P95 1 -Yr I 2 -Yr 10 -Yr 25 -Yr 50 -Yr 100 -Yr Q' (in) q„ (csm/m) 008 012 019 053 1 0.82 1 77 242 298 357 38500 38500 51290 80952 931 69 93169 116598 1165.98 1165 98 Q (cfs) 0.58 0.88 1.91 8.38 14.94 32.11 54.97 67.57 81.07 Post Development -51.1% -46.6% 1 -16.7% 1 -10.8% 1 -5.9% 1 -5.0% 1 -4.6% 1 -4.4% Q' (in) q„ (csmhn) Q (cfs) 0 04 0 O6 0 14 0 44 0 73 1 67 2 30 2,84 3 41 385 00 385.00 385 00 809 52 931 69 931 69 1165 98 1165 98 1165 98 0.28 0.43 1.02 6.98 13.33 30.22 52.23 64.46 77.53 -51.7% 1 -51.1% -46.6% 1 -16.7% 1 -10.8% 1 -5.9% 1 -5.0% 1 -4.6% 1 -4.4% STORM -EZ 8/24/2017 Version 14 Peak Flow Calcs Page 1 of 2 P+ L:.�1„�m:V� ..°.. rY.�•�i .�o�°.a D.'•' ..Pt..,:�'�1v..'_ :i<- ?4;': `.1".�•..ii.. :cif.?r,;'.v a'.Y . a. I *Note To decrease Post -development peak flows -increase storage volume being drawdown or infiltrated or lengthen post- I development time of concentration See LID HELP for more information STORM -EZ 8/24/2017 Version 14 Peak Flow Calcs Page 2 of 2 Operation & Maintenance Agreement Oak Hill Living Center Angier, NC HARNETT County Prepared By: Blair Pittman, PE, Bobbitt Design -Build I Cover Page i Maintenance records shall be kept on the following BMP(s) This maintenance record shall be kept in a log in a known set location. Any deficient BMP elements noted in the inspection will be corrected, repaired, or replaced immediately. These deficiencies can affect the integrity of structures, safety of the public, and the pollutant removal efficiency of the BMP(s). The BMP(s) on this project include (check all that apply & Bioretention Cell Quantity Dry Detention Basin Quantity Grassed Swale Quantity Green Roof Quantity Infiltration Basin Quantity Infiltration Trench Quantity Level SpreaderNFS Quantity Permeable Pavement Quantity Proprietary System Quantity Rainwater Harvesting Quantity Sand Filter Quantity Stormwater Wetland Quantity Wet Detention Basin Quantity Disconnected Impervious Area Present Soil Amendments Present O&M tables will bi Location(s): Location(s)* Location(s), Location(s)* Location(s): Location(s), Location(s) Location(s) Location(s): Location(s): Location(s)* Location(s) Location(s)' Location(s): Location(s): I acknowledge and agree by my signature below that I am responsible for the performance of the maintenance procedures listed for each BMP above, and attached O&M tables. I agree to notify NCDENR of any problems with the system or prior to any changes to the system or responsible party * Responsible Party. Title & Organization: Street address - City, state, zip, Phone number(s): Email 8200-1004 Renaissance Parkway Durham, NC 27713 Signature. Date.�5 I, �\ _, a Notary Public for the State of �rD4 Lc c r(,t i L! County of Q v}' VLe1yY\ do hearby certify that + � �° personally appeared before me this 2g day of2-01 and acknowledge the due execution of the Operations -and Maintenance Agreement . Witness my hand and official seal, V LESHA KELLY NO`TAR PUBLIC Johnsto County North •arolina Seal My commission expires STORM -EZ 8/24/2017 Version 1.4 O&M Manual Page 1 of 5 Bioretention Maintenance Requirements Important operation and maintenance procedures Immediately after the bioretention cell is established, the plants will be watered twice weekly if needed until the plants become established (commonly six weeks). Snow, mulch or any other material will NEVER be piled on the surface of the bioretention cell. Wheeled or tracked equipment will NEVER be driven over the bioretention planting surface. Special care will be taken to prevent sediment from entering the bioretention cell. If standing water is present 2 days after rainfall, conduct an infiltration test of the sod media. After the bioretention cell is established, inspect it quarterly. Inspection activities shall be performed as follows and maintenance activates shall commence immediately to remediate any problems observed per the table below. BMP element: Potential problem: How to remediate the problem: The entire BMP Trash/debris is present. Remove the trash/debns. The perimeter of the BMP Areas of bare sod and/or Regrade the soil to remove the gully, and plant a ground cover and erosive gullies have formed. water until it is established Provide lime and a one-time fertilizer application. Vegetation is too short or too Maintain vegetation at a height of approximately six inches. long The inlet device The pipe is clogged. Unclog the pipe. Dispose of the sediment off-site The pipe is cracked or Replace the pipe. otherwise damaged. Erosion is occurring in the Regrade the swale to smooth it over and provide erosion control swale. devices such as reinforced turf matting or nprap to avoid future problems. Stone verge is clogged or Remove sediment and replace with clean stone. covered in sediment (if applicable). The pretreatment area Flow is bypassing Regrade if necessary to route all flow to the pretreatment area. pretreatment area and/or Restabdize the area after grading. gullies have formed. Sediment has accumulated to Search for the source of the sediment and remedy the problem if a depth greater than three possible. Remove the sediment and restabdize the pretreatment area. inches. Erosion has occurred. Provide additional erosion protection such as reinforced turf matting or nprap 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 practices. vegetation show that pruning is needed to maintain optimal plant health. Plants are dead, diseased or Determine the source of the problem: sods, hydrology, disease, etc dying. 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. Tree stakes/wires are present Remove tree stake/wires (which can kill the tree if not removed). six months after planting. STORM -EZ 8/24/2017 Version 1.4 O&M Manual Page 2 of 5 I Bioretention Maintenance Requirements (continued) I BMP element: Potential problem: How to remediate the problem: The bioretention cell: Mulch is breaking down or has Spot mulch if there are only random void areas. Replace whole mulch soils and mulch floated away. 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 clogged Determine the extent of the clogging - remove and replace either fust With sediment. the top layers or the entire media as needed. Dispose of the spoil in an appropriate off-site location. Use triple shredded hard wood mulch at a maximum depth of three inches. Search for the source of the sediment and remedy the problem if possible. An annual soil test shows that Dolomitic lime shall be applied as recommended per the sod test and pH has dropped or heavy toxic soils shall be removed, disposed of properly and replaced with new metals have accumulated in planting media. the sod media. The underdrain system Clogging has occurred. Wash out the underdrain system. (if applicable) The drop inlet Clogging has occurred. Clean out the drop inlet. Dispose of the sediment off-site. The drop inlet is damaged Repair or replace the drop inlet. The receiving water Erosion or other signs of Contact the local NC Department of Environment and Natural damage have occurred at the Resources Regional Office. outlet. STORM -EZ 8/24/2017 Version 1.4 O&M Manual Page 3 of 5 I Grassed Swale Maintenance Requirements I Important maintenance procedures The drainage area of the grassed swale will be carefully managed to reduce the sediment load to the grassed swale. - After the first-time fertilization to establish the grass in the swale, fertilizer will not be applied to the grassed swale. The grassed swale will be inspected once a quarter. Records of operation and maintenance will be kept in a known set location and will be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately BMP element: Potential problem: How to remediate the problem: The perimeter of the BMP Areas of bare sod and/or Regrade the sod if necessary to remove the gully, and then plant a erosive gullies have formed. ground cover and water until it is established. Provide lime and a one- time fertilizer application. Vegetation is too short or too Maintain vegetation at a height of approximately six inches. long. The entire length of the Trash/debns is present. Remove the trash/debris. swale Areas of bare sod and/or Regrade the sod if necessary to remove the gully, and then re -sod (or erosive gullies have formed. plant with other appropriate species) and water until established. Provide lime and a one-time fertilizer application Sediment covers the grass at Remove sediment and dispose in an area that will not impact streams or the bottom of the swale BMPs Re -sod if necessary. Vegetation is too short or too Maintain vegetation at a height of approximately six inches. long. The outlet device Clogging has occurred. Clean out the outlet device. Dispose of the sediment off-site. The outlet device is damaged Repair or replace the outlet device. The receiving water Erosion or other signs of Contact the local NC Department of Environment and Natural damage have occurred at the Resources Regional Office. outlet STORM -EZ 8/24/2017 Version 1.4 O&M Manual Page 4 of 5 Disconnected Impervious Area Maintenance Requirements Important operation and maintenance procedures The roof area will be maintained to reduce the debris and sediment load to the system Excess debris can clog the - system and lead to bypass of the design storm, and reduced infiltration and pollutant removal. To ensure proper operation as designed, a licensed Professional Engineer, Landscape Architect, or other qualified - professional will inspect the system annually. - The system components will be repaired or replaced whenever they fail to function properly. The system will be visually inspected by the owner/operator at least quarterly. Records of operation and maintenance will be kept in a known set location and will be available upon request. Inspection activities shall be performed as follows. Any problems that are found shall be repaired immediately. BMP element: Potential problem: How to remediate the problem: The captured impervious Excess debris or sediment is Remove the debris or sediment as soon as possible area present on the rooftop or impervious surface. The gutter system (if Gutters are clogged, or water Unclog and remove debris. May need to install gutter screens to applicable) is backing up out of the gutter prevent future clogging. system. Rooftop runoff not making it Correct the positioning or installation of gutters Replace if necessary to into gutter system capture the roof runoff Rooftop runoff causing erosion Install or repair splash blocks as needed. at outlet. Roadways & parking lots Runoff flows to the pervious Remove any sediment or obstructuions at the edge of the impervious (if applicable) area as concentrated flow. area, repair gravel verge Energy dissipaters are unever Repair or replace energy dissipater. settled, undercut, eroded or otherwise damaged. The pervious area Erosion is evident Repair the eroded area and stabilize immediately. There is erosion around the Regrade the sod to create a small berm, and then plant turf grass and end of the pervious area that water until it is established. Provide lime and a one-time fertilizer shows stormwater has application. bypassed it. Unintended trees or shrubs Remove them and re-establish vegetation per the original landscaping have begun to grow in the plan. pervious area. Areas of bare sod and/or Regrade the sod if necessary to remove the gully, and then plant with erosive gullies have formed. turf grass and water until it is established. Provide lime and a one-time fertilizer application. Standing water is present 24 Fill shallow depressions with topsoul and seed mix Regrade the area as hours after rainfall. necessary to reestablish sheet flow across the pervious area. Vegetation is too long. Maintain vegetation at a height of approximately 2 to 6 inches. Property Owner Homeowners have re-routed Provide educational materials to homeowners, and contact Participation gutters or otherwise altered neighborhood HOA. the system in a manner which adversely impacts performance. STORM -EZ 8/24/2017 Version 14 O&M Manual Page 5 of 5