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KLEINFEL ® ER EXPECT MQRE� �r Number of dwelling units per acres on septic tanks within a square mile around the r�. A - proposed Grace Christian Church (unit/acre) = 0.34 (estimated based on 109 lots, assuming 2 homes per lot (218 homes total), divided by (640 acres -6 acres)) W T Annual wastewater loading per dwelling unit per acre (inches) = 1.37 inches (based on 300 gpolresidence) Our calculation that includes both the proposed Grace Christian Church and considering a square mile around the site is as follows- N, = 3.27(35)(1-0.2) + 8.0(0.5) + (0.34)(1.37)(35} (1-0.2) + 8:0(0.5) 10.49 mgllas N + �; (3.27+8.0) (0.34)(1.37} 8.0 10. CONCLUSIONS I he results o ur percolation tests indicate tha suitable soil percolate stratum o not exist at he percolation test location at SJCEHD ed depths tested k' of about 3'/2 as 51/2 feet below existing site grade. A suitable soil condition is defined as -stratum capable of percolating water at a rate of 60 min/inch or faster at shallow 71 depths and 30 min/inch for deep tests. As previously mentioned, there was not a concentration of DBCP found in the groundwater in detectable amounts. ' J The nearest water bodies to the site are an irrigation canal and the San Joaquin River, approximately 0.5 and 0.8 miles to the north, respectively. Du o distance to the San Joaquin River and t fine-grained subsurface soils, we nfii ipate hat the impact to surface w Ater will be low. r ' The concenfr fio`n o nitrate-nitrogen (N) in-the oundwater was equal to the state standard of 10 mg/l. Based on these results and,4he results of our nitrate loading calculations, we stimate that the potential nitrate-nitrogen concentration in a g.Four�t ter;resulting from the proposed [each field, will rise above the state standard rng/l . of 10 Due to the slow percolation characteristics of the subgrade soil, the depth to rT groundwater, the already high nitrate-nitrogen (N) concentration, and the results of our. nitrate loading calculations, it is our professional opinion that conventiona c- tanklleach trench sewage disposal system designed per SJCEHD criteria w` I not adeg ately serve the proposed Grace Christian Church and that there �a,nee fo n ^eneere�septic system be installed at the site. The engineered system should be des' e p c professionals and contractors such as Chesney Consulting. `? If needed, Chesney Consulting can be reach at (209) 668-1403. r-4 t^ 78311.G0VST07R193 March 5,2007 I ©2007 Kfeinfelder,lnc. Page 7 of 8