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s <br /> Work Plan Addendum <br /> April 1997 <br /> CHAPIN BROS.,INC. <br /> 1766 Monte Diablo Avenue, Stockton, California <br /> 1.0. INTRODUCTION <br /> In accordance with the request of Mr. Russell Chapin,Advanced GeoEnvironmental, Inc., (AGE) <br /> has prepared this Work Plan Addendum for 1766 Monte Diablo Avenue, Stockton, California(the <br /> site). The scope of work includes the installation of one ground water monitoring well, one soil <br /> vapor extraction(SVE)well and six in-situ air sparging(IAS)points. The SVE well and IAS points <br /> will be connected to the existing SVE/IAS remediation system. The location of the site and its <br /> surroundings are illustrated in Figure 1 -Location Map. Structures and well locations are illustrated <br /> in Figure 2 -Site Plan. <br /> Remediation activities are performed in accordance with guidelines for investigation of underground <br /> storage tank (UST) sites established by the San Joaquin County Public Health Services - <br /> Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control <br /> Board(CVRWQCB). <br /> Site history and findings from previous investigations and monitoring events at the site are detailed <br /> in the Corrective Action Plan (CAP) and the Quarterly Reports prepared by AGE, dated 28 March <br /> 1997. <br /> 2.0. SCOPE, OF WORK <br /> 2.1. PROPOSED DRILLING, PROBING AND SAMPLING <br /> An SVE/IAS system has been installed at the site to remediate hydrocarbon-impacted soil and <br /> ground water. The system presently consists of a catalytic oxidizer, supplied by the Underground <br /> Storage Tank Cleanup Fund,a compressor-based IAS unit,installed by AGE, six SVE wells and one <br /> IAS injection point. However,two of the SVE wells are not presently connected to the SVE network <br /> and MW-4, originally anticipated to be utilized for extraction, is no longer suitable because of a rise <br /> in ground water elevation at the site. Furthermore,the rise in ground water elevation has resulted in <br /> no well being downgradient of the remediation area. <br /> One additional monitoring well, one additional SVE well and six additional IAS points will be <br /> necessary to remediate and monitor the site effectively. Wells VW-1 and VE-1 should also be <br /> connected to the SVE system for maximum cleanup efficiency. <br /> AGE proposed to install one 2-inch diameter ground water monitoring northwest of the site, within <br /> the City of Stockton right-of-way; one SVE well near MW-4 at the southeast portion of the site; and <br />