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16 ARCADIS GERAGHTY& MILLER " <br /> 1 <br /> July 24, 1998 <br /> ' Ms Donna Heran,Director REHS <br /> Ms Margaret Lagorio, Supervising REHS <br /> ' Site Mitigation Unit <br /> San Joaquin County <br /> Environmental Health Division, Public Health Services <br /> ' 304 E Weber Ave , Third Floor <br /> Stockton, CA 95201-0388 <br /> ' Subject Former UNOCAL Gas Station No 2859, 1665 Pacific Ave, Stockton <br /> California <br /> Dear Ms Heran <br /> Thank you for your letter dated June 26, 1998, in which you reviewed the <br /> "Vertical Fuel Hydrocarbon Plume Delineation Hydropunch <br /> Investigation/Piezometer Installation" work plan dated May 26, 1998, prepared <br /> and submitted by ARCADIS Geraghty and Miller, Inc (ARCADIS Geraghty and <br /> Miller) on behalf of UNOCAL. for the above-referenced site <br /> ' UNOCAL has expressed interest in working cooperatively with the San <br /> Joaquin County Public Health Services (SJCPHS) in order to arrive at a work plan <br /> to complete the soil and water investigation phase of its response at this site in <br /> ' accordance with the current state of knowledge of groundwater hydrology <br /> regarding contaminant fate, transport, and remediation This letter responds to <br /> your specific comments in the above-cited letter of June 26, 1998, accepts and <br /> ' incorporates most of the SJCPHS comments, and requests SJCPHS concurrence <br /> with the original work plan as amended by this letter Upon receipt of your written <br /> concurrence, UNOCAL will begin work at the site according to the schedule <br /> 1 described in the work plan. <br /> In order to further progress at the site, ARCADIS Geraghty and Miller <br /> ' requests that the May 26, 1998 work plan be modified to separate two issues 1) <br /> collecting data which SJCPHS and UNOCAL agree are sufficient to complete the <br /> soil and water investigation and, 2) the preparation of a Corrective Action Plan <br /> (CAP) Specifically, it is requested that SJCPHS concur with this request to <br /> ' withdraw preparation of a CAP as part of the work scope proposed under the <br /> submitted work plan Once the SJCPHS and UNOCAL agree that the extent of <br /> the release has been adequately characterized by investigation, data evaluation, and <br /> ' reporting, the parties can discuss the preparation of a CAP. <br /> 1 <br /> 1 <br />