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VI. IN-TRODUCTION Mr. & Mrs. Larry and Sharon Rinauro are proposing to build a two-bedroom house and move a modular (prefabricated) house onto parcel APN 248-12-02 at 8923 West Etcheverry Drive. The lots on West Etcheverry Drive are 1.5 acres and are in a rural, unsewered area. The project site is south of the city of Tracy and southwest of the Tracy Defense Depot. City of Tracy water and sewer systems currently extend to Valpico Road. However, the Section of land where the Rinauro's property is located, referred to as the "Valpico Section," will probably never hook up to City water and sewer. The Valpico Section is bound by Linne Road to the south, Chrisman Road to the east MacArthur Road to the west and Valpico Road to the north. The San Joaquin County Environmental Health Department (EHD) has requested the information found in this report due to the following reasons: 1.) The parcel will contain two dwelling units (single family residences). Therefore, there must be assurances that the septic disposal area will accommodate these two houses, along with a 50% replacement area. 2.) Applicable distances must be maintained between surrounding wells and the proposed septic system disposal area. This is illustrated on the San Joaquin aerial Parcel Viewer map found in the Appendix. 3.) Conversely, the domestic well to be installed for the Rinauro's must be an adequate distance from surrounding septic systems. This must be verified by the well driller. 4.) Since the land subdivisions on Etcheverry Drive occurred in 1986, this project must comply with the Environmental Health Department Sewage Standards, specifically Section 10 - "Requirements for Waste Disposal for New Land Developments." All subdivisions after 1972 must comply with Section 10. 5.) The parcel is Iocated in a nitrate impacted area. Near surface soil information, including percolation testing, must be obtained to document shallow soil characteristics and the potential for mitigation of nitrate formation. The primary concern of nitrate in drinking water is that high concentrations can cause methemoglobinemia in infants and it can also induce abortion or death in cattle. This disease occurs through a series of complex chemical reactions within the hemoglobin in the blood. Only infants and young children are susceptible. Although this disease is extremely rare, nitrate can also potentially cause other health concerns. There have been scientific studies to suggest that nitrate may produce carcinogenic effects in humans. With this investigation and testing,nitrate impact was quantified from the two proposed residences that will be built and placed on the subject parcel. The results of the soil testing and nitrate calculations reveal that 1.)the soils at the maximum leachline depth of 42 inches have excellent percolative capacity, . 2.)the soil chemistry results indicate that the indigenous soil environment possesses favorable characteristics for increasing denitrification potential, and 3.)the nitrate loading calculations indicate that the recharge water from the two houses will not exceed the Maximum Contaminant Level for nitrate. Page -1- Chesney Consulting