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• <br /> ARCADIS GERAGHTY& MILLER <br />' ARCADIS Geraghty&Miller Inc <br /> 3700 State Street <br />' Ms Donna Heran Suite 350Santa Barbara <br /> San Joaquin County California 93105 <br /> Environmental Health Division, Public Health Services Tel 805 687 7559 <br />' 304 E Weber Ave , Third Floor Fax 805 687 0838 <br /> Stockton, CA 95201-0388 <br />' ENVIRONMENTAL <br /> Subject: <br /> Vertical Fuel Hydrocarbon Plume Delineation Hydropunch— <br />' Investigation/Piezometer Installation Former UNOCAL Gas Station No 0187, 437 <br /> East Miner Ave, Stockton CA (Station No 0I 87) <br />' <br /> Dear Ms Heron Santa Barb= <br /> 26 May 1998 <br />' ARCADIS Geraghty & Miller, Inc, (ARCADIS Geraghty & Miller) has cioritact <br /> prepared this workplan on behalf of UNOCAL of California (UNOCAL) for a limited Dr Stephen Cullen <br /> subsurface investigation at the subject site This workplan was prepared in response to <br /> a request by the San Joaquin Public Health Service (SJCPHS) to vertically delineate <br /> the dissolved-phase petroleum hydrocarbon plume at the subject site <br /> Extension <br /> 805 687 7559 <br />' PURPOSE <br /> The investigation proposed herein is designed to complete the site <br />' investigation activities necessary to provide data which will serve as the fundamental <br /> basis for the design of a corrective action plan which will result in the protection or <br /> restoration of the waters of the State of California as defined and described in Title 23 <br />' It is the understanding of ARCADIS Geraghty & Miller that the SJCPHS is <br /> concerned that rising groundwater elevations from a reported historic low of 70 feet <br />' below ground surface(bgs)to the present-day levels of approximately 32 feet bgs may <br /> have submerged the dissolved-phase hydrocarbons below the existing groundwater <br /> monitoring well network Data collected at the Site between 1994 and 1998 indicate <br />' that the maximum depth to groundwater was observed at monitoring well U-1 <br /> Maximum depth-to-water in this well has been reported to be 47.91 feet below the top <br /> of the well casing (btoc) in November of 1994, the minimum depth to water in this <br /> well was reported to be 29 58 feet btoc m March, 1998 UNOCAL or its consultants <br /> have not received, reviewed, or reported data that provides substantiation of reports <br /> that the former historic low groundwater levels have reached depths as great as 70 feet <br /> below ground surface However, it is noted that reports of the historic low <br /> groundwater levels are Incorporated as an assumption for the purposes of development <br /> of this work plan <br />' Our ret <br /> G <br /> ^sM SANTA_BARBARAIDATAIAARQSBOUJNOCALIC VALt.Ey1NWS RF:VIMINRWP2A.DpG <br />