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Impervious areas: Buildings/lined holding ponds/tank farms/concrete areas/paved areas= 12.6 ac 1.13 ft x 325,851 gals/ac-ft=368,211 gals/ac x 12.6 ac=4,639,467 gals runoff from impervious areas entering the lined ponds area. (b) 35.8 ac x 0.833 ft=29.82 ac-ft x 325,851 gals/ac-ft=9,717,333 gals rainfall directly as recharge(c) 13.5" - 10.0" =3.5" Lost to evaporation from impervious areas 3.5" x 27,154 gals/ac-in x 35.8 ac=3,402,396 gals(d) (e)=4,639,467 gals(b)+9,717,467 gals(c)-3,402,396 (d)= 10,954,538 (R2) R1 + R2 =R=9,717,333 gals+ 10,954,538 gals=20,671,871 gals=63.44 ac-ft III. NITRATE LOADING STUDY FINDINGS A. WASTEWATER FLOW VOLUME PROJECTIONS AND CHARACTERISTICS Wastewater Flow Volume Projections To determine nitrate-nitrogen loading from any project, wastewater flow volumes must be determined as accurately as possible. Flow volume projections will be approximated from the number of on-site employees and customers, as illustrated in Table 4 below. Wastewater flow volumes from the facility will be based on an assumed maximum fixture usage of 5x during a 10 hr shift for each employee: 1.5 gals flush + 0.5 gals hand washing=2 gals/use x 0.5 uses/hr= 1 gals/hr x 10 hr/shift/employee = 10 gals per shift per employee. The following illustrates the number of employees per shift+customers per shift and total wastewater generation as an Average Daily Flow(ADF). TABLE 4 Shift Number of Employees+ Daily Wastewater Flow Customers Volume Generated First Shift: 7AM to 5PM 42+3 =45 45 x 10 gals=450 Second Shift: 12PM to I OPM 14+2= 16 16 x 10 gals= 160 Third Shift: l OPM to 8AM 16+0= 16 16 x 10 gals= 160 TOTALS 77 770 gals/day-ADF Total wastewater flow volume= 770 gpd 770 gpd x 6 days per week=4,620 gpw x 50 work weeks/yr= 231,000 gpy= 0.71 ac ft. This yearly wastewater generation will*be used for the nitrate loading calculations below. Page -6- Chesney Consulting