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Sutter Homes Winery <br /> Page No. 6 <br /> t y Four soil borings were drilled by Neil O. Anderson & Associates and were described in <br /> our Nitrate Loading Letter Report dated September 4, 1998. The four test holes were excavated <br /> to a depth of 15 feet to characterize the soil profile of the area and obtain ground water samples <br /> # for nitrate testing. <br /> In general, the upper 4 to 9 feet of soil encountered in the test holes consisted of a loose <br /> Ito medium dense sandy silt. This was underlain by a medium dense to dense silty sand which <br /> Fi <br /> was slightly cemented in places and continued to the maximum depth explored of 15 feet. <br /> A percolation test was performed for the Sutter Home Winery by Condor Earth <br /> Technologies, Inc. A copy of the report was provided to us by The Facility Engineers, Inc. and is <br /> F attached for review. One 18-inch deep percolation test was conducted at the proposed septic <br /> field and percolated 480 minutes/inch (see Condor percolation report in appendix). <br /> ! VII ' NITRATE LOADING STUDY <br /> A build up of nitrates in the upper ground-water zones can cause a temporary blood <br /> 3 disorder in infants called methemoglobinemia(blue baby syndrom). Serious and occasionally <br /> fatal poisonings in infants have occurred following the ingestion of water containing nitrate <br /> iconcentrations greater than 10 mg/I (nitrate-N) or 45 mg/l (nitrate as NO,). <br /> Two potential sources of a nitrate associated with the project are the proposed septic field <br /> F, and the processed winery effluent. The proposed septic field will be a"mounded" design that <br /> will dissipate the waste and maintain a 5 foot separation from ground water. The system will be <br /> E <br /> designed to percolate a "0" level-of nitrate effluent into the shallow ground water. To verify the <br /> system performance, two 15 foot ground-water monitoring wells will be used to monitor nitrate <br /> levels down gradient of the septic source. The septic system design and nitrate impact analysis is <br /> being conducted by another consultant and will be submitted with this report to the San Joaquin <br /> County Environmental Health Division. <br /> The processed winery effluent is estimated to be 10,000 gallons per day (3.51 MG <br /> annual) and is to be treated and applied to approximately 42 acres of onsite vineyards. A Summit <br /> Engineering report concluded that the 42 acres of vineyard is adequate for approximately 22.48 <br /> MG of treated annual disposal/reuse of process wastewater, far more then the 3.51 MG estimated <br /> } use. <br /> t <br /> a or RS ti <br /> a <br /> x � <br /> C R <br /> ! + 4SgflG� <br /> `t <br /> f <br />