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w NEW YORK <br /> MEMPHIS <br /> ORLANDO <br /> United States Testing Company, Inc. ® t%ELE MIAMI <br /> Unitech Services Group <br /> 3540 OAKDALE ROAD • P.O.BOX 6673MODESTO,CALIFORNIA 95355 (209)527-2271 IE N F <br /> pR � IEGO <br /> ENVIRpIVivlNr <br /> PERMIT/ �4,1/ HE�{LTH <br /> USTCOGC89-121 April 13, AgICES <br /> Ms. Jane Cochrane <br /> 30941 South Koster Street <br /> Tracy, CA 95376 <br /> Subject: Addendum to USTCOGC89-12 , January 19, 1989 <br /> Retest of Field Percolations <br /> Per San Joaquin Environmental Health Department <br /> Dear Ms. Cochrane: <br /> Between April 4 and 11, 1989 representatives from United States <br /> Testing Company, Inc. secured permits from the San Joaquin <br /> Environmental Health Department and performed field percolation <br /> tests to the specifications outlined by the aforementioned <br /> department. <br /> Mr. Ed Padilla was on site to inspect the percolation test the <br /> last hour and approved the tests. The soil profiles previously <br /> submitted in our letter of January 19, 1989 were considered <br /> acceptable. This was confirmed by Fred Kaufman on April 5, 1989. <br /> Percolation Test <br /> Three additional tests were performed in the locations of the <br /> proposed leach fields. Approximate percolation test locations <br /> are shown on Figure 1. <br /> The tests were performed at the bottom of hole four feet from the <br /> existing grade. <br /> A range of percolation rates from 12 min. per inch to 40 min. per <br /> inch were determined and are shown on Figure 1. Previous test <br /> data in minutes per inch are listed below for comparison with the <br /> most recent results. <br /> Test Date Test Date <br /> Location 4/5/89 1/10/89 <br /> 1 15 min./inch 9.0 min./inch <br /> 2 40 min./inch 48 min./inch <br /> 3 12 min./inch 15 min./inch <br /> MEMBER OF THE SGS GROUP(SOCIETE GENERALE DE SURVEILLANCE) <br />