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Hogan Residence Page 5 CHEMICAL ANALYSIS As part of the conditions for approval an analysis of the water from the private well onsite near the mobile home was requested. The water was sampled from the faucet directly from the well and not from the interior tap of the house. The samples were 'r placed in the appropriate containers, placed on ice and delivered to the laboratory for analysis. The water was analyzed for nitrates and Dibromochloropropane (DBCP) . Test results reported that there is 33 mg/l or parts per million (ppm) of ._ nitrates and .90 ug\1 or parts per billion (ppb) of DBCP in the water from the well. When we compare the test results to the Primary Drinking water standards established by the Department of Health Services in Title 26 of the California Code of Regulations (CCR), the levels of nitrate present are below the maximum contaminant level of 45 ppm. Nitrate levels above 45 ppm are known to present a health risk when used for drinking or culinary purposes. The maximum contaminant levels presented for DBCP is .2 ppb. By comparison the test results( .9 ppb) indicate an elevated level of DBCP in the water. This level presented on the CCR indicates that this level should not be exceeded in water supplied to the public. A copy of the test results and the chain of custody forms are presented in appendix A . CONCLUSIONS AND RECOMMENDATIONS The results of our investigation indicate that the soil is suitable for construction of an additional septic system on the property. There does not appear to be any condition or occurrence on the site or in the vicinity that would prohibit the construction of the system. The percolation rate of the soil is high and should provide adequate percolation from the system. The Soil Conservation Service indicated that because of the highly permeable soil a "community sewage systems may be necessary to prevent contamination of the water supplies as a result of the on-site sewage disposal systems." If a high density of disposal systems were introduced into the area and the effluent was released into a concentrated area it is possible that the ground water could be impacted. We recommend that no seepage pits be used for the disposal of liquid wastes and that _ the leach field systems be well maintained. Liquid waste should be dispersed over as wide a leach field area as practical thus reducing the concentration of sewage to one specific area. It should also be noted that all offsets for property lines wells and other construction requirements must be maintained. To prevent overload of contaminants into the ground water table the quantity of sewage systems in the area should be limited and the area over which such systems are installed should be as large as is practical.