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August 26,2002 <br /> Job Number:LG02-286 <br /> Page I1 <br /> Table 6. <br /> Summary of Nitrate Mass Balance Analysis. <br /> Result(mg/L-N)Nc* Acres Quantity Effluent Denitrification Rainfall <br /> (gal/day) Concentration (%) Infiltration <br /> (mg/L-N)* I I (in) <br /> 5.4 17.15 1 1,301 1 45 1 10 1 6.84 <br /> *Note:Maximum contaminate level(MCL)for Nitrate is 10 mg/L-N and 45 mg/L as NO3. Please note that the <br /> average septic waste water level of 45 mg/L-N is not related to the nitrate drinking water MCL of 45 mg/L as NO3. <br /> ` VIII. CONCLUSIONS AND RECOMMENDATIONS <br /> In conclusion, a satisfactory percolation rate was achieved within the Phase II septic <br /> system disposal area. The depth to ground water was found to range between 60 to 75 feet in <br /> 1999. The ground water flow direction below the site was south to southeast in 1999. <br /> Ground water measured from the onsite water well was analyzed for DBCP and nitrate. <br /> The analysis indicated that DBCP was non-detectable and nitrate was non-detectable. The <br /> result of the nitrate test indicates the ground water is well below the maximum contaminate level <br /> set by the United States Environmental Protection Agency of 45 mg/L as NO3 (or 10 mg/L-N). <br /> As a result of the nitrate loading analysis, an average nitrate concentration of percolating <br /> water(Nc)is 5.4 mg/L-N. The maximum contaminate limit for safe drinking water is 10 mg/L- <br /> N (or 45-mg/L-NO3). Due to the relatively large size of the property, quantity of rain falling on <br /> the property, and the relatively low quantity of effluent expected to be generated from the site, <br />` we do not believe the Nc will be above the maximum contaminate limit of 10 mg/L-N over the <br /> long term. <br /> Our specific recommendations are as follows: <br /> 1) Construct the new septic system in accordance with the Sewage Standards of the <br /> San Joaquin County Public Health Services, Environmental Health Division. <br /> 2) If the use(sewage) level during special events should exceed the assumptions <br /> listed in this report,the use of chemical toilets is recommended. <br /> 3) Follow San Joaquin County Public Health Services Sewage Standards where <br /> applicable. <br /> Q 4 <br /> 1J0� <br /> r <br />