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Work Plan Addendum <br /> February 1998 <br /> CHAPIN BROS., INC. <br /> 1766 Monte Diablo Avenue, Stockton, California <br /> 10. INTRODUCTION , <br /> In accordance with the request of Mr Russell Chapin,Advanced GeoEnvironmental, Inc (AGE)has <br /> prepared this Work Plan Addendum for 1766 Monte Diablo Avenue, Stockton, California(the site) <br /> The scope of work includes the installation and sampling of one ground water monitoring well, one <br /> ground water in-situ air sparging(lAS), dual-completed as a soil vapor extraction well and two soil <br /> borings The location of the site and its surroundings are illustrated in Figure 1 - .Location Map <br /> Structures and well locations are illustrated in Figure 2 - Site Plan <br /> Investigation activities will be performed in accordance with guidelines for investigation of <br /> underground storage tank(UST) sites established by the San Joaquin County Public Health Services <br /> - Environmental Health Division(PHS-EHD) and Cential Valley Regional Watei 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 Report prepared by AGE, dated 28 March <br /> 1997 <br /> 2 0. SCOPE OF WORK <br /> 2 1 PROPOSED DRILLING AND SAMPLING <br /> A soil vapor extraction (SVE)/IAS system has been installed and operated at the site to remediate <br /> hydrocarbon-impacted soil and ground water The system currently consists of a catalytic oxidizer, <br /> supplied by the Underground Storage Tank Cleanup Fund, a compressor-based IAS unit, installed <br /> by AGE, SVE wells and IAS infection points <br /> Over the course of the remediation an area in the eastern portion of the site, determined to outside <br /> the IAS systems apparent area of influence, has not experienced a significant reduction of dissolved <br /> hydrocarbons Areas of the site influenced by the IAS system have demonstrated a reduction in <br /> dissolved hydrocarbons <br /> The rise in ground water elevation has resulted in a significant portion of contaminated soil <br /> remaining below the level the ground water capillary fringe or top of the water table Under this <br /> condition, more effort from the TAS system will be required to volatilize hydrocarbons in the <br /> saturated soils <br />