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[5] Continued. <br /> Shallow groundwater flow lines would in all probability flow <br /> towards the Lone Tree Creek when there is sufficient water in the <br /> creek to create this type of potential differential . <br /> A nitrate analysis was performed from the domestic water well on <br /> Parcel No. l (Serpa Residence) . The results are found in the <br /> Appendix and indicate a fairly high level of nitrate concentration <br /> at 38 mg/l . The Maximum Contaminant Level (MCL) as mandated by the <br /> California Department of Health Services is 45 mg/l . This nitrate <br /> concentration illustrates there has been some impact upon the <br /> groundwater from upgradient agricultural practices, or from local <br /> septic systems. <br /> [6] PROPOSED SEPTIC TANK SIGHTING AND USAGE <br /> There are no septic systems currently on the subject parcel, <br /> although there is a septic system on Parcel No. 1 of the subject <br /> property. The deep soil structure of the subject parcel is <br /> conducive to a rapid permeability, however, it is our <br /> recommendation that the septic system for the subject parcel should <br /> consist of a 12 , 000 square foot leaching area and a "seepage pit" <br /> system. There is to be a minimum of 40 feet of leaching line <br /> between the septic tank and the pit. The pit will have a minimum <br /> diameter of 33 inches and be installed to a maximum depth of 25 <br /> feet. All recommended sewage disposal areas are in compliance with <br /> _ the regulations of the San Joaquin Department of Environmental <br /> Health. This sewage disposal area conforms with all of the <br /> "distance" separation requirements from applicable objects, <br /> particularly the Lone Tree Creek. <br /> 4 <br /> - �l lily �ontrol Inspectimi <br />