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Dec. 15. 2006 5.28PM Advanced GeoEnvironmental No, 7092 P. 2/3 <br /> Advanced <br /> GeoEnvironmental, Inc. :��•• <br /> 15 December 2006 <br /> AGE-NC Project No. 95-0103 <br /> Mr.Nuel Henderson <br /> San Joaquin County-Environmental Health Department(EHD) <br /> 304 E.Webber Avenue,3`d Floor <br /> Stockton, CA 95201 <br /> Subject: Ground Water Extraction-Work Plan Addendum <br /> CHAPIN BROTHERS INVESTMENTS,INC. <br /> 1766 Monte Diablo Avenue, Stockton, California <br /> Dear Mr. Henderson: <br /> At the request of Mr. Russell Chapin(property owner),Advanced GeoEnvironmental,Inc. (AGE) <br /> has provided the following Ground Water Extraction- Work Plan Addendum for the site at 1766 <br /> Monte Diablo, Stockton, California. The work plan addendum was prepared in response to the <br /> Environmental Health Department(EHD)letter dated 19 October 2006. <br /> AGE prepared the Remedial Action Work Plan Addendum, dated 28 June 2001 and the plan was <br /> approved by the EHD by letter dated 15 August 2001. The Remedial Action Work Plan Addendum <br /> described the use of monitoring well MW-1,vapor weld VE-1, VE-5 and VE-6,in conjunction with <br /> the use of proposed extraction wells EW-1, EW-2 and EW-3. Two of the existing shallow <br /> monitoring wells(MW-1) or vapor extraction wells(VE-1)did not produce adequate groundwater <br /> for active ground water remediation. However, vapor extraction well VE-6 did produce minimal <br /> groundwater and was significantly impacted with petroleum hydrocarbons, thus requiring <br /> remediation. <br /> Based on the current distribution of dissolved hydrocarbons (fourth quarter 2006) and the steady <br /> increase of dissolved hydrocarbon in the northern potion of the site, ground water extraction is <br /> required to capture the remaining dissolved plume. An ditional set of four-inch diameter wells <br /> should be installed at the following locations;vapor well VE-1 near the northern edge of the building <br /> on the site;north of well MW-4 near well MW-1 in the former eastern UST excavation and near the <br /> location of vapor well VE-6, at the northern edge of the western UST excavation. The objective of <br /> this work plan is to enhance the limited ground water extraction network currently on the site and <br /> produce an adequate draw-down for the dissolved plume capture. <br /> fir.. ✓" - ,2S <br /> Mw v - /tw/'- 3S ' TD (Idw �, �tUl SoetA 0-30' 6o <br /> V - _711T , <br />