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• <br />December 17, 2019 <br />RECEIVED <br />DEC 1 8 2 019 <br />FOR: San Joaquin County Environmental Health Department <br />Mr. Michael Kith, REHS, Program Manager <br />1868 Hazelton Ave. <br />Stockton, CA 95205 <br />ENVIRONMENTAL HEALTH <br />PERMIT/SERVICES <br />PROJECT: Wat Dhammararam Heaven Buddhist Temple Project <br />3732 East Carpenter Road <br />Stockton, California 95215 <br />APN: 179-160-50, SR0080912 <br />SUBJECT: Response to the EHD Consultant's request of performing a rainfall Mass Balance Approach <br />for the project Nitrate Loading Calculations. <br />INTRODUCTION <br />Reference is made to the project listed above. The EHD consultant, Mr. Norman Hantzsche, PE of Questa <br />Engineering, provided EHD with a rainfall Mass Balance Approach for the Nitrate Loading calculations <br />illustrated below, pertaining to this project. Available Rainfall and Net Rainfall Recharge data were <br />provided by Mr. Hantzsche. Found on Page 2 are the Nitrate Loading calculations I used in the original Soil <br />Suitability/Nitrate Loading Study. <br />Hantzsche Rainfall Mass Balance Approach <br />Available Rainfall = 17.85" (1.49 ft) <br />Net Rainfall Recharge = 8.82" (0.735 ft) <br />Pervious areas = 23 ac x 325,851 gals/ac-ft x 0.735 ft = 5,508,511 gals (R1) <br />Buildings/paved areas = 213,570 sf = 6.9 ac <br />1.49 ft x 325,851 gals/ac-ft = 485,518 gals/ac x 6.9 ac = 3,350,074 gals runoff from building/paved areas <br />entering Retention Basin (b) <br />19,000 sf Retention Basin area = 0.436 ac <br />0.436 ac x 0.735 ft = 0.321 ac-ft x 325,851 gals/ac-ft = 104,422 gals rainfall directly into Basin (c) <br />(e) = 3,350,074 gals (b) + 104,422 gals (c) = 3,454,496 gals (R2) <br />R1 + R2 = R = 5,508,511 gals + 3,454,496 gals = 8,963,007 gals = 27.51 ac-ft <br />IN(1 - d) + R N b <br />Nr = (I+R) <br />Page 1 of 3 <br />33ax 3794 + gudadi, ea 95381 -4- (209) 402-1652 + dddieenty@diadeft.net