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t <br /> a <br /> k" KLEINFELDER <br /> File No. 20-2983-02 REO"'cvvE ., <br /> April 15, 1991 <br /> APR 2 2 <br /> ENVIRONMENTAL HEAL T H <br />� PERMIT✓��RVI <br /> W.D.O. , Inc. <br /> F 7599 Linne Road, Suite 1 <br /> Tracy, CA 95376-9137 ,- <br /> Attention: W. Dave Olmstead <br /> Subject: NITRATE LOADING STUDY/WALNUT GROVE ESTATES <br /> SOUTHEAST OF TRACY <br /> SAN JOAQUIN COUNTY, CALIFORNIA <br /> Dear Dave: <br /> This letter is in response to your letter dated April 8 , 1991, <br /> which requested that the proposed Walnut Groves Estates subdivision <br /> be included in our nitrate loading study performed for several of <br /> the adjacent subdivisions. Reference is made to our nitrate <br /> loading study report entitled "Addendum to Septic System <br /> Suitability Studies, Proposed Subdivision Located Near Valpico Road <br /> and MacArthur Drive, " dated October 26, 1990 . Specifically, the <br /> report included the Lillegard Estates, Mancuso Estates, Cara <br /> Estates and Trains Estates subdivisions, all located west of and <br /> adjacent to the proposed Walnut Grove Estates subdivision. <br /> Reference is made to our geotechnical investigation report dated <br /> February 22 , 1990, which was prepared for the proposed Walnut Grove <br /> Estates subdivision. This report included a. percolationtest+on _ <br /> each of the fourteen proposed 1-1/2-acre lots. All fourteen Lots <br /> produced a passing percolation test at the time of our report. We <br /> understand that it is currently planned to redivide the property <br /> to contain 1-acre lots instead of the previously planned 1-1/2- <br /> acre lots. This will result in six additional lots for a total of <br /> twenty lots. <br /> In preparing our nitrate loading study, several septic systems and <br /> wells in the area of the subdivisions were sampled and tested for <br /> nitrate content. Two of the septic systems sampled were located <br /> at the northeast and southwest corners of the Walnut Grove <br /> subdivision site. Reference is made to Plate I of our referenced <br /> nitrate loading study report which indicates the locations of the <br /> referenced subdivisions and the locations sampled. <br /> KLE1F14FEVR Vkt M15"4 &r6tkWt; Stockton, CA 95205 (209) 948-1345 Page 1 of 2 <br />