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ad <br /> Advanced` <br /> GeoEnvironmental Inc. - :: :: : <br /> 2006 MA? -I AM I I: 08 <br /> SAN iGk) <br /> +r'6 _ .. <br /> U4TY <br /> ENV1RtdriENT Al <br /> 28 February 2006 HEALTH D E P A R T ME N T <br /> AGE-NC Project No. 95-0184 <br /> Ms. Vicki McCartney <br /> San Joaquin County Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject: Well Installation Work Plan -February 2006 <br /> LARRY'S AUTO <br /> 308 North Grant Street,Stockton, California (U <br /> Dear Ms. McCartney: <br /> At the request of Mr. Charles Skobrak,Advanced GeoEnvironmental,Inc. (AGE)has prepared this <br /> work plan to install additional ground water monitoring wells at and in the vicinity of 308 Nort� , <br /> Grant Street, Stockton, California; the work plan was prepared in accordance with Califotnia 4 <br /> Regional Water Quality Control Board guidelines. In letters dated 27 December 200 ; the San v� V✓� <br /> Joaquin County Environmental Health Department(EHD)requested the preparatio a work plan <br /> for the installation of additional ground water monitoring wells to define theyt1ration of ground <br /> water impacted by high concentrations of methyl tertiary butyl ether(MTBE), 1,2-dichloroethane <br /> and other petroleum hydrocarbon compounds. The purpose of this work plan is to aide in defining <br /> the lateral and the localized vertical extent of dissolved hydrocarbons in the ground water at the site. <br /> The dominant grogwater flow direction has been east and sampling conducted upgradient has <br /> defined the dissolved plume west and north of the site. <br /> Currently a network of closely-spaced shallow and intermediately screen4ells are installed at the <br /> northwest corner of the site, coinciding with the former underground storage tank(UST) Tank A <br /> location.Additionally,two wells are located at the southern edge ofthe site,one well installed within <br /> the former UST Tank B and C area. Additional wells are justified and necessary east of the current <br /> well network to define the down gradient extent of dissolved hydrocarbons. The northern UST area <br /> is surrounded by low warehouse buildings, therefore, limited access is available and the depth of <br /> monitoring wells proposed will be hindered by drill rigs available for these well installations. <br /> Therefore, AGE proposes the installation of monitoring wells in the following configurations: <br /> • Installation of one shallow monitoring well(Hydrogeologic unit 1 at 30-50 feet bsg),east of <br /> the former UST#1 location, within the auto repair bay. <br /> 837 Shaw Road, Stockton,California 95215 <br /> Telephone(209)467-1006 Fax(209)467-1118 <br />