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1828'RBUTE ROAD SUITE A <br /> SACRAMENTO,CA 95815 <br /> 916-649-3570 <br /> 800-395-3570 July 2, 1998 <br /> FAX:(916)649.3819 05-001500 <br /> H IVF <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 445 San Joaquin Street <br /> rn 2L� <br /> P.O. Box 2009 C� Stockton, California 95201 <br /> '400014 <br /> Subject: Work Plan to Perform Subsurface Investigation <br /> Keenes Corner <br /> ErJVIROrJMENTAL 735 North Main Street <br /> ENGINEERING Manteca, California <br /> Dear Sirs/Madames: <br /> INDUSTRIANorthwest Envirocon, Incorporated (NWE) has been authorized by Mr. Paul Fry <br /> HYGIENE` to prepare this work plan to perform a subsurface investigation at the subject site <br /> (Figures 1 and 2). This proposal includes the collection of soil and groundwater <br /> samples for laboratory analysis. <br /> Project Background <br /> n ANAGEME°N It is NWE's understanding that the site is currently a multi-tenant commercial <br /> structure and previously operated as a retail gasoline service station. Available data <br /> indicates that groundwater is present at a depth of approximately 20 feet below <br /> ground surface, with an estimated groundwater flow direction to the west. <br /> Available documents and San Joaquin County Public Health Services- <br /> SERV;CES <br /> LABORATORY Environmental Health Division (SJEHD) information indicate that a 10,000- <br /> ES nvon l ) <br /> gallon gasoline underground storage tank (UST), a 7,500-gallon gasoline UST, a <br /> 5,000-gallon gasoline UST, and a 550-gallon waste oil UST were removed from <br /> the subject Property in May 1987. Soil samples collected during the UST <br /> removal reportedly did not contain detectable concentrations of petroleum <br /> constituents, lead, volatile organic compounds, and polychlorinated biphenyl <br /> FINGINEERING <br /> MAINTENANCE compounds l ounds (/ ) PPCBs in soils beneath the site. However, due to the collapse of an <br /> ENGIN <br /> UST pit wall, SJEHD believes that an adequate number of samples were not <br /> collected from the UST excavation. In addition, the laboratory detection limit for <br /> many of the chemical analytes apparently exceeded current standards. Therefore, <br /> SJEHD has requested additional investigation of the site. <br /> ASBESTOS <br /> Scope of Services <br /> The work described in this work plan is intended to assess the presence or absence <br /> of petroleum hydrocarbon constituents, halogenated volatile organic compounds <br /> (HVOCs), and/or metals at selected locations underlying the subject Property. <br /> ENVIRONMENTAL The intended scope of services is outlined below. <br /> rRAIN,rJG <br /> OFFICES NATIONWIDE <br />