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V E-175 <br /> 0 <br /> APR 0 5 1393 <br /> ENVIRONMENTAL HEALTH <br /> 1-1❑0 GROUNDWATER PERMIT/SERVICES <br /> DE11:1 TECHNOLOGY, INC. 4057 Port Chicago Highway Concord CA 94520(415)6112387 <br /> FAA (415)685 9148 <br /> April 2, 1993 <br /> Project Number 020503879 <br /> Site Code 2155 <br /> Ms Linda Turkett <br /> San Joaquin County Public Health Services <br /> P 0 Box 2009 <br /> 445 N San Joaquin Street <br /> Stockton, CA 95201 <br /> Subject First Quarter 1993 Report, Manteca Bean Facility <br /> 229 Moffat Boulevard, Manteca, California <br /> Dear Ms Turkett <br /> This letter has been prepared by Groundwater Technology, Inc on behalf of Golden Grain Company as <br /> a quarterly status report on groundwater and soil conditions at the Manteca Bean Facility in Manteca, <br /> California, for the quarter ending March 1993 The purpose of the field work was to determine <br /> groundwater gradient and the distribution of dissolved hydrocarbons in groundwater Groundwater <br /> monitoring data and results of laboratory analyses of groundwater samples collected on February 18, <br /> 1993, are included All work was performed as described in a monitoring and sampling plan submitted <br /> to, and approved by San Joaquin County Public Health Services on February 27, 1992 <br /> In addition to quarterly monitoring and sampling activities, the sod and groundwater remediation system <br /> continued to operate during this quarter Details regarding the operation of the system including the <br /> efficiency of the system and the continued remediation plans for the site are discussed below <br /> MONITORING WELL GAUGING <br /> Prior to well purging and water sample collection on February 18, 1993, Groundwater Technology <br /> personnel gauged 14 of the 15 site-related wells to determine the depth to water and the depth to <br /> separate-phase petroleum (SP), if present The well gauging was conducted in accordance with the <br /> Leaking Under round Fuel Tank Field Manual (LOFT) published by the State of California Leaking <br /> Underground Fuel Tank Task Force dated October 1989 Groundwater monitoring data are summarized <br /> in Table 1 The water table elevations for February 18, 1993, were used to prepare a potentiometric <br /> mdace map for the site (Figure 1) The potentiometric surface elevations in the site-related groundwater <br /> onitoring wells increased an average of 2 49 feet since the last monitoring event conducted on <br /> Dray MCS <br /> Offices throughout the(IS Canada and Overseas <br />