Cumberland Contractor Yard - Supplemental Form Final

QuantityInfiltration System 3Bioretention Cell 0Wet Pond 0Stormwater Wetland 0Permeable Pavement 0Sand Filter 1Rainwater Harvesting 0Green Roof 0Level Spreader-Filter Strip 0Disconnected Impervious Surface 0Treatment Swale 0Dry Pond 0Applicant:Name and Title:Organization:Street address:City, State, Zip:Phone number(s):Email:DesignerCertification Statement:Signature of DesignerDatePlease indicate the types, quantities and locations of SCMs that will be used on this project:[e-mail] number(s):Scott RobinsonERM NC Inc.15720 Brixham Hill Ave. Suite 120Charlotte, NC [e-mail] Contractor YardSUPPLEMENT-EZ FORM COVER PAGESealviolations as well as a report being made to my professional board.- that the information provided in the form is, to the best of my knowledge- that the engineering plans, specifications, operation and maintenancethe information provided here.I am aware that there are significant penalties for submitting falseinformation including the possibility of fines and imprisonment for knowing and belief, true, accurate, and complete; andagreements and other supporting information are consistent withI certify, under penalty of law: that this Supplement-EZ form and all supportinginformation were prepared under my direction or supervision; Designer information for this project:Location(s)Project Name:AddressCity / TownAtlantic Coast Pipeline, LLL c/o Dominion Energy Transmission Inc.Richard B. GangleACP - Cumberland Contractor Yard (CY-10A)Fayetteville, NC 283122808 Downing RoadCumberland Contractor YardEmail:5000 Dominion Blvd.Glen Allen, VA 23060804-273-2814Company:Contact:Mailing Address:City, State, Zip:Cover Page19:49 PM 5/2/20184/30/2018
INFILTRATION SYSTEMS1 Drainage area numberBasin 221 Total coastal wetlands area (sq ft) 0 - Parking / driveway (sq ft)Total surface water area (sq ft)0 - Sidewalk (sq ft)Total drainage area (sq ft)1071140.00 - Roof (sq ft)BUA associated with existing development (sq ft) 0 - Roadway (sq ft)Proposed new BUA (sq ft)760510.00 - Other, please specify in the comment box below (sq ft) Percent BUA of drainage area 71.00%Total BUA (sq ft)760510Design rainfall depth (in)1.0 inMinimum volume required (cu ft) 85691 cfDesign volume of SCM (cu ft) 117418 cf#1 Is the SCM sized to treat the SW from all surfaces at build-out? Yes#7 If applicable, with the SCM be cleaned out after construction?Yes#2 Is the SCM located on or near contaminated soils? No#8 Does the mainetenance access comply with General MDC (8)?Yes#3 What are the side slopes of the SCM (H:V)? 3:1#9 Does the drainage easement comply with General MDC (9)?Yes#3 Does the SCM have retaining walls, gabion walls or other engineered side slopes? No#10 If the SCM is on a single family lot, does the plat comply with General MDC (10)?No#4 Are the inlets, outlets, and receiving stream protected from erosion (10-year storm)? Yes#11 Is there an O&M Agreement that complies with General MDC (11)?Yes#5 Is there a a bypass for flows in excess of the design flow?Yes#12 Is there an O&M Plan that complies with General MDC (12)?Yes#6 What is the method for dewatering the SCM for maintenance?Other#13 Was the SCM designed by an NC licensed professional?Yes #1 SHWT elevation (fmsl)90.5 ft#5 Length (ft)75 ft#1 Was the soil investigated in the footprint and at the elevation of the infiltration system? Yes#5 Width (ft)95. ft#1 Soil infiltration rate (in/hr).1 in/hr#5 Depth/Height (ft)1 ft#5 Surface area of the bottom of the infiltration system (sq feet)5676 sf#5 Ponding depth of the design volume (in)24 in#5 Estimated dewatering time (hours)69 hrs#5 For trenches only: Perforated pipe diameter, if applicable (inches)n/a#2 SHWT elevation (fmsl)88.5 ft#5 For trenches only: Number of lateralsn/a#2 Bottom of the Infiltration system (fmsl)91 ft#5 For trenches only: Stone type, if applicable1.5" to 2.5"#2 Is a detailed hydrogeologic study attached if the separation is between 1 and 2 feet?#5 For trenches only: Stone void ratio (%)40%#3 Proposed slope of the subgrade surface (%)0%#5 For trenches only: Is stone free of fines?Yes#3 Are terraces or baffles provided?No#5 For trenches only: Is the stone wrapped in geotextile fabric?Yes#4 Describe the pretreatment that will be provided: #6 Is the infiltration system located underground? Yes#6 If so, has at least one infiltration port been provided? YesTHE DRAINAGE AREASandy Loam, Clay Loam, Sandy Clay Loam, see soils report for test data and hydraulic properties.Break down of BUA in the drainage area (both new and existing):COMPLIANCE WITH THE APPLICABLE STORMWATER PROGRAMStormwater program(s) that apply (please specify):GENERAL MDC FROM 02H .1050Grassed approach slopes into the basin.INFILTRATION SYSTEM MDC FROM 02H .1051#1 Briefly describe the hydraulic properties and characteristics of the soil profile:ADDITIONAL INFORMATIONPlease use this space to provide any information about this infiltration system that you think is relevant to the review:ACP - Cumberland Contractor Yard (CY-10A)Infiltration29:49 PM 5/2/2018
INFILTRATION SYSTEMSACP - Cumberland Contractor Yard (CY-10A)2Drainage area numberBasin 222Total coastal wetlands area (sq ft) 0 - Parking / driveway (sq ft)Total surface water area (sq ft)0 - Sidewalk (sq ft)Total drainage area (sq ft)232175.00 - Roof (sq ft)BUA associated with existing development (sq ft) 0 - Roadway (sq ft)Proposed new BUA (sq ft)150914.00 - Other, please specify in the comment box below (sq ft) Percent BUA of drainage area 65.00%Total BUA (sq ft)150914Design rainfall depth (in)1.0 inMinimum volume required (cu ft) 18574 cfDesign volume of SCM (cu ft) 29489 cf#1 Is the SCM sized to treat the SW from all surfaces at build-out? Yes#7 If applicable, with the SCM be cleaned out after construction?Yes#2 Is the SCM located on or near contaminated soils? No#8 Does the mainetenance access comply with General MDC (8)?Yes#3 What are the side slopes of the SCM (H:V)? 3:1#9 Does the drainage easement comply with General MDC (9)?Yes#3 Does the SCM have retaining walls, gabion walls or other engineered side slopes? No#10 If the SCM is on a single family lot, does the plat comply with General MDC (10)?No#4 Are the inlets, outlets, and receiving stream protected from erosion (10-year storm)? Yes#11 Is there an O&M Agreement that complies with General MDC (11)?Yes#5 Is there a a bypass for flows in excess of the design flow?Yes#12 Is there an O&M Plan that complies with General MDC (12)?Yes#6 What is the method for dewatering the SCM for maintenance?Other#13 Was the SCM designed by an NC licensed professional?Yes#1 SHWT elevation (fmsl)88.9 ft#5 Length (ft)65 ft#1 Was the soil investigated in the footprint and at the elevation of the infiltration system? Yes#5 Width (ft)22. ft#1 Soil infiltration rate (in/hr).1 in/hr#5 Depth/Height (ft)1 ft#5 Surface area of the bottom of the infiltration system (sq feet)1430 sf#5 Ponding depth of the design volume (in)24 in#5 Estimated dewatering time (hours)66 hrs#5 For trenches only: Perforated pipe diameter, if applicable (inches)n/a#2 SHWT elevation (fmsl)88.9 ft#5 For trenches only: Number of lateralsn/a#2 Bottom of the Infiltration system (fmsl)92 ft#5 For trenches only: Stone type, if applicable1.5" to 2.5"#2 Is a detailed hydrogeologic study attached if the separation is between 1 and 2 feet?#5 For trenches only: Stone void ratio (%)40%#3 Proposed slope of the subgrade surface (%)0%#5 For trenches only: Is stone free of fines?Yes#3 Are terraces or baffles provided?No#5 For trenches only: Is the stone wrapped in geotextile fabric?Yes#4 Describe the pretreatment that will be provided: #6 Is the infiltration system located underground? Yes#6 If so, has at least one infiltration port been provided? YesGENERAL MDC FROM 02H .1050INFILTRATION SYSTEM MDC FROM 02H .1051#1 Briefly describe the hydraulic properties and characteristics of the soil profile:Sandy Loam, Sandy Clay Loam, see soils report for test data and hydraulic properties.Grassed approach slopes into the basin.Break down of BUA in the drainage area (both new and existing):COMPLIANCE WITH THE APPLICABLE STORMWATER PROGRAMStormwater program(s) that apply (please specify):THE DRAINAGE AREAADDITIONAL INFORMATIONPlease use this space to provide any information about this infiltration system that you think is relevant to the review:Infiltration39:49 PM 5/2/2018
INFILTRATION SYSTEMSACP - Cumberland Contractor Yard (CY-10A)3Drainage area numberBasin 223Total coastal wetlands area (sq ft) 0 - Parking / driveway (sq ft)Total surface water area (sq ft)0 - Sidewalk (sq ft)Total drainage area (sq ft)161608.00 - Roof (sq ft)BUA associated with existing development (sq ft) 0 - Roadway (sq ft)Proposed new BUA (sq ft)122822.00 - Other, please specify in the comment box below (sq ft) Percent BUA of drainage area 76.00%Total BUA (sq ft)122822Design rainfall depth (in)1.0 inMinimum volume required (cu ft) 12929 cfDesign volume of SCM (cu ft) 20238 cf#1 Is the SCM sized to treat the SW from all surfaces at build-out? Yes#7 If applicable, with the SCM be cleaned out after construction?Yes#2 Is the SCM located on or near contaminated soils? No#8 Does the mainetenance access comply with General MDC (8)?Yes#3 What are the side slopes of the SCM (H:V)? 3:1#9 Does the drainage easement comply with General MDC (9)?Yes#3 Does the SCM have retaining walls, gabion walls or other engineered side slopes? No#10 If the SCM is on a single family lot, does the plat comply with General MDC (10)?No#4 Are the inlets, outlets, and receiving stream protected from erosion (10-year storm)? Yes#11 Is there an O&M Agreement that complies with General MDC (11)?Yes#5 Is there a a bypass for flows in excess of the design flow?No#12 Is there an O&M Plan that complies with General MDC (12)?Yes#6 What is the method for dewatering the SCM for maintenance?Other#13 Was the SCM designed by an NC licensed professional?Yes#1 SHWT elevation (fmsl)90.1 ft#5 Length (ft)20 ft#1 Was the soil investigated in the footprint and at the elevation of the infiltration system? Yes#5 Width (ft)16. ft#1 Soil infiltration rate (in/hr).3 in/hr#5 Depth/Height (ft)1 ft#5 Surface area of the bottom of the infiltration system (sq feet)320 sf#5 Ponding depth of the design volume (in)12 in#5 Estimated dewatering time (hours)65 hrs#5 For trenches only: Perforated pipe diameter, if applicable (inches)n/a#2 SHWT elevation (fmsl)90.1 ft#5 For trenches only: Number of lateralsn/a#2 Bottom of the Infiltration system (fmsl)92.4 ft#5 For trenches only: Stone type, if applicable1.5" to 2.5"#2 Is a detailed hydrogeologic study attached if the separation is between 1 and 2 feet?#5 For trenches only: Stone void ratio (%)40%#3 Proposed slope of the subgrade surface (%)0%#5 For trenches only: Is stone free of fines?Yes#3 Are terraces or baffles provided?No#5 For trenches only: Is the stone wrapped in geotextile fabric?Yes#4 Describe the pretreatment that will be provided: #6 Is the infiltration system located underground? Yes#6 If so, has at least one infiltration port been provided? YesCOMPLIANCE WITH THE APPLICABLE STORMWATER PROGRAMStormwater program(s) that apply (please specify):GENERAL MDC FROM 02H .1050INFILTRATION SYSTEM MDC FROM 02H .1051Break down of BUA in the drainage area (both new and existing):THE DRAINAGE AREA#1 Briefly describe the hydraulic properties and characteristics of the soil profile:Sandy Loam, Sandy Clay Loam, see soils report for test data and hydraulic properties.ADDITIONAL INFORMATIONPlease use this space to provide any information about this infiltration system that you think is relevant to the review:Infiltration49:49 PM 5/2/2018
SAND FILTER1 Drainage area numberBasin 224 Total coastal wetlands area (sq ft)0 - Parking / driveway (sq ft)Total surface water area (sq ft)0 - Sidewalk (sq ft)Total drainage area (sq ft)138956 - Roof (sq ft)BUA associated with existing development (sq ft) - Roadway (sq ft)Proposed new BUA (sq ft)30570 - Other, please specify in the comment box below (sq ft) Percent BUA of drainage area22.00%Total BUA (sq ft)30570Design rainfall depth (in)1.0 inMinimum volume required (cu ft) 11117 cfDesign volume of SCM (cu ft)11908 cf#1 Is the SCM sized to treat the SW from all surfaces at build-out? Yes#7 If applicable, with the SCM be cleaned out after construction?Yes#2 Is the SCM located on or near contaminated soils? No#8 Does the mainetenance access comply with General MDC (8)?Yes#3 What are the side slopes of the SCM (H:V)? 3:1#9 Does the drainage easement comply with General MDC (9)?Yes#3 Does the SCM have retaining walls, gabion walls or other engineered side slopes? No#10 If the SCM is on a single family lot, does the plat comply with General MDC (10)?Yes#4 Are the inlets, outlets, and receiving stream protected from erosion (10-year storm)? Yes#11 Is there an O&M Agreement that complies with General MDC (11)?Yes#5 Is there a a bypass for flows in excess of the design flow?Yes#12 Is there an O&M Plan that complies with General MDC (12)?Yes#6 What is the method for dewatering the SCM for maintenance?Other#13 Was the SCM designed by an NC licensed professional?Yes #1 SHWT elevation (fmsl)89.5 ft #3 Volume of stormwater from drainage area during design storm (cubic feet) 27094 cf#1 Type of sand filter (open or closed) Open #3 Total volume that can be stored above the sediment and sand chambers (cubic feet) 11908 cf#1 If closed, describe if the filter will be pre-cast or pour-in-place: #3 Is this sand filter designed to attenuate peak flows? Yes#3 Elevation of the bypass device (fmsl) 93 ft#1 If closed, top of grate elevation (fmsl) n/a#2 Volume that can be retained in the sediment chamber (cubic feet) n/a#2 Will there be a permanent pool in the sediment chamber? n/a#2 Bottom of the sediment chamber (fmsl) n/a #4 Ponding depth from the top of the sand to the bypass device (ft) 1 ft#2 Area of the sediment chamber (square feet) n/a#2 Physical depth of the sediment chamber (inches) n/a#2 Ponding depth in the sediment chamber, above any permanent pool (inches) n/a#2 Elevation of top of weir between chambers (fmsl)n/a#2 Volume that can be retained in the sand chamber (cubic feet) n/a#2 Bottom of the sand chamber (fmsl) n/a #7 Depth above underdrain pipe (inches) 12 in#2 Area of the sand chamber (square feet) n/a #8 Will the media be maintained to drain at least two inches per hour at the sand surface? Yes#2 Physical depth of the sand chamber (inches) n/a #9 Is at least one clean-out pipe provided at the low point of each underdrain line? Yes#2 Ponding depth in the sand chamber, above any permanent pool (inches) n/a #9 Will clean-out pipes be capped? YesTHE DRAINAGE AREAGENERAL MDC FROM 02H .1050Break down of BUA in the drainage area (both new and existing):COMPLIANCE WITH THE APPLICABLE STORMWATER PROGRAMStormwater program(s) that apply (please specify):Please use this space to provide any additional information about this sand filter that you think is relevant to the review:The site is extremely flat resulting in smaller berm heights capable of storage. Rip rap spillways with a grout filter strip to prevent leakage is utilized as the primary release rather than a CMP riser. The outlet pipe of the underdrain system discharges directly to the downstream toe of the embankment.SAND FILTER MDC FROM 02H .1056ADDITIONAL INFORMATIONForebay Weir completely surrounds the edge of the sand filter.#3 Describe the bypass device:#5 Describe the mechanism for distributing flow over the sand surface:#6 Sand specification for sand chamber ASTM C-33 Sand (Cleaned, washed)Rip Rap weir with a grout strip to prevent leakage of runoff through the facility.ACP - Cumberland Contractor Yard (CY-10A)Sand Filter 22459:49 PM 5/2/2018