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l <br /> j E. SURFACE WATER INFORMATION AND CALCULATIONS <br /> NLS§3.2. The property is 7.76 acres and consists of impervious buildings, asphalt/concrete <br /> hardscape, and pervious landscaping consisting of effluent disposal and stormwater disposal areas. <br /> These areas are delineated and quantified as follows: <br /> TABLE 3 <br /> goo wm r o <br /> 1/015/1 / <br /> HARVEST CHURCH BUILDING AND ASSOCIATED BUILDINGS 16,940 SQ FT;0.389 AC <br /> ASPIRE VINCENT SHALVEY ACADEMY AND PLAY AREA 58,215 SQ FT; 1.34 AC <br /> ASPHALT PARKING AREAS 138,716 SQ FT;3.185 AC <br /> PERVIOUS LANDSCAPING 124,190 SQ FT;2.851 AC <br /> TOTALS 338,061 SQ FT;7.76 AC <br /> The rainfall recharge factor used in the Hantzsche-Finnemore equation below has been derived <br /> from a water balance document from Hantzsche (one of the authors of the nitrate loading equation) <br /> found in Appendix G, which illustrates his water balance analysis of Net Rainfall Recharge (NRR). <br /> The data presented in this document indicates an NRR of 8.82" for the Stockton area, and is <br /> therefore applicable for this project. <br /> The following is the Mass Balance Approach utilizing the referenced precipitation and Eto data: <br /> Net Rainfall Recharge= 8.82" (0.735 ft) <br /> Pervious areas=2.851ac <br /> Impervious areas=4.91 ac <br /> 0.735 ft x 325,851 gals/ac-ft=239,500 gals/ac x 4.909 ac= 1,175,708 gals runoff from impervious areas <br /> flowing into stormwater runoff areas. (R1) <br /> 0.735 ft x 325,851 gals/ac-ft=239,500 gals/ac x 2.851.6 ac=682,815 gals rainfall directly as recharge <br /> from pervious areas. (R2) <br /> R1 +R2 =R 1,175,708 gals+682,815 gals= 1,858,523 gals=5.88 ac-ft <br /> i <br /> l <br /> Page -5- <br /> Chesney Consulting <br />