Neilson WTP Modernization - 4- Attachment B

of
Project/Phase No.
x Alternate Calculations
For additional assumptions, refer to Page:
B&V Standard Computer-Aided Calculation Used?x Yes No
0 J.G. COGGINS
If yes, Verification only requires checking the accuracy of inputs and reviewing reasonableness of outputs.
If no, Verification requires (1) checking of the actual formulas used in the calculation along with the accuracy of
Review and Approval
Rev Prepared By Date Verified By Date Approved By Date
This Section Used for B&V Standard Computer-Aided Calculations
Program Name/Number:Version:
No. Assumption Verified By Date
1
Unverified Assumptions Requiring Subsequent Verification
Project Name:NEILSON WTP MODERNIZATION 192980
Calculation Title:STORMWATER DRAINAGE AREAS AND CALCULATIONS
Calculation No./File No.:4 / 34.0500
Verification Method: Check and Review
Objective:
TO DESCRIBE THE DRAINAGE AREAS AND SHOW PERMIT APPLICATION CALCULATIONS

Excel Calculation Record Cover Sheet
Client Name:CCUC Page:1 4
IV. PROJECT INFORMATION
CALCULATIONS
4. Total Property Area:65.5 acres
5. Coastal Wetlands Area:0 acres
6. Total Surface Water Area:8.85 acres
7. Total Project Area:56.65 acres (4)-(5)-(6)=Total Project Area
8. Project percent of impervious area:0.24%(Total Impervious Area / Total Project Area) x 100
1
Total Drainage Area (AC)65.56
Receiving Stream Muddy Creek
Stream Class C
Stream Index Number 12-94-(0.5)
Total Drainage Area (SF)2,855,794
On-Site Drainage Area (SF)2,855,794
Off-Site Drainage Area (SF)-
Proposed Impervious Area (SF)6,884
% Imp Area (Total)0.24%
On-Site Buildings/Lots (SF)6,884
On-Site Streets (SF)-
On-Site Parking (SF)-
On-Site Sidewalks (SF)600
Other On-Site (SF)-
Future (SF)-
Off-Site (SF)-
Existing BUA (SF)382,354
Total (SF)389,838
Drainage Area Drainage Area 1
BASIN INFORMATION
IMPERVIOUS AREA
Basin Information DA 1
Receiving Stream Name Muddy Creek
Stream Class* C
Stream Index Number* 12-94-(0.5)
Total Drainage Area (sf) 2,855,794
On-site Drainage Area (sf) 2,855,794
Off-site Drainage Area (sf) -
Proposed Impervious Area** (sf) 6,884
% Impervious Area** (total) 0.24%
Impervious** Surface Area DA 1
On-site Buildings/Lots (sf) 6,884
On-site Streets (sf) -
On-site Parking (sf) -
On-site Sidewalks (sf) 600
Other on-site (sf) -
Future (sf)-
Off-site (sf) -
Existing BUA*** (sf) 382,354
Total (sf): 389,838