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-AD <br /> GROUNDWATER <br /> EIDLTECHNOLOGY, INC. 4U57Port Chicago Highway,Concord,CA94520(4i )67E-'l387 <br /> FAX:(415)685-9148 <br /> April 30, 1993 <br /> Project No. 020203767 <br /> Mr. Bob Vasquez <br /> The Southland Corporation <br /> 5820 Stoneridge Mall Road, Suite 310 ' <br /> Pleasanton, California 94588 <br /> SUBJECT: Remedial Action Plan Addendum No. 2 <br /> Southland Site No. 20304 <br /> 455 Grant Line Road <br /> Tracy, California <br /> Dear Mr. Vasquez: <br /> Groundwater Technology, Inc. has prepared this Remedial Action Plan. Addendum No. 2 in response <br /> to a request letter, dated February 17, 1993, from the San Joaquin County Public Health Services <br /> (SJCPHS), Environmental Health Department, for clarification of proposed soil remediation at the <br /> subject site. The SJCPHS letter presents a review of Groundwater Technology's Remedial Action <br /> Plan Addendum, dated January 14, 1993. <br /> The primary goal of the proposed remedial action at the site is to reduce the total mass of petroleum <br /> hydrocarbons in the soil and groundwater and to obtain site closure. Groundwater Technology <br /> proposes to conduct the site remediation in two phases. Phase I will consist of the following <br /> activities: <br /> ■ Gain hydraulic control (containment) of the identified dissolved petroleum <br /> hydrocarbon plume while dewatering a portion of the saturated zone through <br /> groundwater extraction and treatment. The installation of the groundwater extraction <br /> well is currently planned for the week ending May 14, 1993. <br /> ■ Excavate a trench for the installation of the groundwater extraction system (GWES) <br /> influent and effluent pipes and soil vapor extraction pipes. The groundwater <br /> extraction system influent and effluent pipes will be installed with fittings strategically <br /> located to allow two additional groundwater extraction wells to be piped into the <br /> groundwater treatment system. <br /> • Conduct a soil vapor extraction test on monitoring wells MW-8, MW-9, and <br /> MW-10. <br /> Concurrent with dewatering, tests will be conducted to evaluate the effectiveness of a soil-vapor <br /> extraction system. The dewatering will expose more soils containing hydrocarbons and thereby <br /> 3767RO13 <br /> Offices throtughurd the U.S..Canada and Overseas <br />