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f , <br /> r` <br /> GROUND ZERO ANALYSIS, INC. <br /> 1714 Main,Street <br /> Escalon,California 95320-1927 i D <br /> Telephone:(209)838-9888 <br /> Facsimile:(209)838-9883 j <br /> SEP 0 7 2004 <br /> September 2, 2004 <br /> ENVIRONMENT HEALTH <br /> t PERMIT/SERVICES <br /> i <br /> Ms. Vicky McCartney <br /> San Joaquin County Environmental Health Department <br /> 304 E. Weber Ave., Third Floor <br /> Stockton, CA 95202 <br /> Subject: Workplan for Additional Subsurface Investigation <br /> H&H Engineering and Construction Facility, 212 Industrial Drive, Stockton, CA <br /> Dear Ms. McCartney: <br /> Ground Zero Analysis, Inc. is writing to present you with a Workplan for an additional subsurface <br /> investigation. The purpose of the proposed work is to further define the lateral extent of groundwater <br /> contamination, particularly upgradient of the former UST and downgradient of monitoring well MW3. <br /> This Workplan describes the proposed methodologies for the drilling and sampling of seven soil <br /> borings. <br /> i <br /> y E <br /> BACKGROUND <br /> use of a leaking underground storage <br /> Soil and groundwater contamination is present at the site because g g g <br /> tank system. Additional investigation of the lateral limits of contamination upgradient and <br /> downgradient of the source area is needed. ]; <br /> Geographic and Hydrogeologic Setting <br /> The site location is shown on Figure 1. Land use in the�isite vicinity is mostly industrial and <br /> commercial intermixed with open fields. The elevation of the site is approximately 16 feet above <br /> mean sea level. Depth to groundwater at the site has fluctuated between approximately 27 to 38 <br /> feet below the ground surface (bgs). Groundwater flow ',has been predominantly toward the <br /> northeast during the six years of monitoring at this site. . Groundwater elevation data are <br /> summarized in Table 1. <br /> Previous Soil and Groundwater Investigations I <br /> The following information was obtained from previous soil'} and groundwater assessment reports <br /> prepared by Kleinfelder Associates, Krazan & Associates, Inc., a summary chronology of the site, <br /> and correspondence from the San Joaquin County Environmental Health Department{(EHD). <br /> P : <br /> i <br /> i <br /> 11GZA FSIVOL 11DATAIGROUNDZEIW-EIREPORT5lhydpuWKPLAN.doc <br />. I! <br />