Proposed DaVita Dialysis Center - Supplement Sheets

BIORETENTION CELL
1
Drainage area number 1A
Total coastal wetlands area (sq ft)N/A - Parking / driveway (sq ft)17479 sf
Total surface water area (sq ft)N/A - Sidewalk (sq ft)637 sf
Total drainage area (sq ft)23301 sf - Roof (sq ft) sf
BUA associated with existing development (sq ft)N/A - Roadway (sq ft) sf
Proposed new BUA (sq ft)19324 sf - Other, please specify in the comment box below (sq ft) 1208 sf
Percent BUA of drainage area 83%Total BUA (sq ft)19324 sf
Design rainfall depth (in)N/A
Minimum volume required (cu ft)1546 cf
Design volume of SCM (cu ft)1805 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)?
#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)N/A #6 Percentage of medium to coarse washed sand by volume 75-85%
#1 Bottom of the bioretention cell (fmsl)279.8 ft #6 Percentage of fines (silt and clay) by volume 8-10%
#1 Distance from bottom to SHWT (feet)N/A #6 Percentage of organic matter by volume 5-10%
#2 Surface area of the bioretention cell (square feet)1079 sf #6 Type of organic material Pine Bark
#2 Design volume of the bioretention cell (cubic feet)1805 cf #7 Phosphorus Index (P-Index) of media (unitless) N/A
#2 Ponding depth of the design storm (inches)8 in #8 Will compaction be avoided during construction?Yes
#3 Is the bioretention cell used for peak attenuation?Yes #9 Will cell be maintained to a one inch/hour standard?Yes
#3 Depth of peak attenuation over planting surface (in)11 in #10 Describe the planting plan:
#3 Height of peak attenuation outlet above the planting surface (in) in
#4 Infiltration rate of the in situ soil (inch/hour)N/A
#4 Diameter of the underdrain pipes (if applicable)4"
#4 Does the design include Internal Water Storage (IWS)?Yes #11 Depth of mulch, if applicable (inches)1 in
#4 if so, elevation of the top of the IWS (fmsl)278.3 ft #11 Type of mulch, if applicable N/A
#4 Elevation of the planting surface (fmsl)280.8 ft #12 How many clean out pipes are being installed?1
#5 Will the cell contain trees and shrubs?No #12 Briefly describe the pretreatment that will be used:
#5 Media depth (inches)30 in
2
Drainage area number 1B
Total coastal wetlands area (sq ft)N/A - Parking / driveway (sq ft)12129 sf
Total surface water area (sq ft)N/A - Sidewalk (sq ft)1151 sf
Total drainage area (sq ft)29387 sf - Roof (sq ft)8500 sf
BUA associated with existing development (sq ft)N/A - Roadway (sq ft) sf
Proposed new BUA (sq ft)22169 sf - Other, please specify in the comment box below (sq ft) 389 sf
Percent BUA of drainage area 75%Total BUA (sq ft)17495 sf
Design rainfall depth (in)N/A
Minimum volume required (cu ft)1785 cf
Design volume of SCM (cu ft)2215 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)?
#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)N/A #6 Percentage of medium to coarse washed sand by volume 75-85%
#1 Bottom of the bioretention cell (fmsl)280.8 ft #6 Percentage of fines (silt and clay) by volume 8-10%
#1 Distance from bottom to SHWT (feet)N/A #6 Percentage of organic matter by volume 5-10%
#2 Surface area of the bioretention cell (square feet)1917 sf #6 Type of organic material Pine Bark
#2 Design volume of the bioretention cell (cubic feet)2215 cf #7 Phosphorus Index (P-Index) of media (unitless) N/A
#2 Ponding depth of the design storm (inches)16 in #8 Will compaction be avoided during construction?Yes
#3 Is the bioretention cell used for peak attenuation?Yes #9 Will cell be maintained to a one inch/hour standard?Yes
#3 Depth of peak attenuation over planting surface (in)16 in #10 Describe the planting plan:
#3 Height of peak attenuation outlet above the planting surface (in)16 in
#4 Infiltration rate of the in situ soil (inch/hour)N/A
#4 Diameter of the underdrain pipes (if applicable)4 in
#4 Does the design include Internal Water Storage (IWS)?Yes #11 Depth of mulch, if applicable (inches)1 in
#4 if so, elevation of the top of the IWS (fmsl)279.3 ft #11 Type of mulch, if applicable N/A
#4 Elevation of the planting surface (fmsl)281.8 ft #12 How many clean out pipes are being installed?1
#5 Will the cell contain trees and shrubs?Yes #12 Briefly describe the pretreatment that will be used:
#5 Media depth (inches)30 in
Other BUA accounts for offsite impervious area.
GENERAL MDC FROM 02H .1050
Sod will be planted in the bio-retention cell.
N/A
ADDITIONAL INFORMATION
THE DRAINAGE AREA
BIORETENTION CELL MDC FROM 02H .1052
THE DRAINAGE AREA
BIORETENTION CELL MDC FROM 02H .1052
Break down of BUA in the drainage area (both new and existing):
COMPLIANCE WITH THE APPLICABLE STORMWATER PROGRAM
Stormwater program(s) that apply (please specify):
Other BUA accounts for offsite impervious area.
Break down of BUA in the drainage area (both new and existing):
COMPLIANCE WITH THE APPLICABLE STORMWATER PROGRAM
Stormwater program(s) that apply (please specify):
GENERAL MDC FROM 02H .1050
ADDITIONAL INFORMATION
Please use this space to provide any additional information about this bioretention cell that you think is relevant to the review:
Sod will be planted in the bio-retention cell.
N/a
Please use this space to provide any additional information about this bioretention cell that you think is relevant to the review:
Bioretention 1 2:08 PM 10/31/2017