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k4 KLEINFELDER <br /> An employee owner!company <br /> File No. 16631.G01 <br /> June 17, 2002 <br /> Mr. Terry Alexander <br /> 7474 West 11"' Street <br /> Tracy, CA 95304 <br /> Subject: RESULTS OF GROUNDWATER NITRATE TESTING <br /> 7474 WEST 11 lb STREET <br /> TRACY, CALIFORNIA <br /> Dear Mr. Alexander: <br /> This letter presents the results of our groundwater nitrate testing for an existing septic system <br /> located at 7474 West 11t1' Street in Tracy, California. The purpose of our study was to test the . <br /> groundwater for existing nitrate levels. The study was performed per the requirement of the San <br /> Joaquin County Environmental Health Department (SJC EHD) that the water be tested in order <br /> to determine whether the existing septic tank/leach field system may be used for the existing <br /> building. The following includes the groundwater depth in the project area, discussions <br /> regarding our investigative procedures and the results of nitrate testing are presented. Finally, <br /> the project limitations are provided. <br /> GROUNDWATER DEPTH <br /> During the time of our investigation, groundwater was encountered at a depth of approximately 9 <br /> feet. <br /> FIELD EXPLORATIONS AND TESTING <br /> The subsurface conditions at the site were explored on May 23, 2002, by drilling one boring to a <br /> depth of approximately 15 feet below existing grade. The boring was drilled using a Simco 2400 <br /> truck-mounted drill rig equipped with 4-inch O.D. solid-stem auger. The location of the boring <br /> was just south of the building's southwest corner at the north end of the access gate. We <br /> understand that this is immediately east of the existing septic system. PVC pipe was installed <br /> with a bentonite seal placed at approximately 2 feet above groundwater depth. <br /> Two water samples have been taken and tested for nitrate content, one on May 28 and one on <br /> June 7, 2002. The water samples were submitted to Sequoia Analytical using chain-of-custody <br /> procedures for nitrate testing. The results of our tests and a copy of the chain-of-custody forms <br /> are attached. <br /> 16631.GOIIST02R080 June 17,2002 <br /> ©2002 Kleinfelder,Inc. Page I of 3 <br /> KLEINFELDER 2825 East Myrtle Street, Stockton,CA 95205-4794 (209)948-1345 (209)948-0621 fax <br />