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i <br /> r <br /> 83 WEST MARCH LANE <br /> 1� SUITE 12 <br /> 1 STOCKTON.CA 95207 <br /> PF,ONE 1209}x!75-1635 <br /> AIANAam mw-memw4SOuws _�_ _- <br /> ,j June 25, 1991 <br /> Ms. Eleanor Ratliff <br /> San Joaquin County.Environmental Health Division <br /> Public'Health Services <br /> P.O. Box 2009, <br /> Stockton, CA 95201 W.O. 6254-01-02 <br /> RE: Souza Realty <br /> Grantline Plaza - Groundwater Investigation <br /> Tracy, California <br /> Dear Ms. Ratliff, <br /> On behalf of Souza Realty and in response to your letter,to Souza Realty dated June 17, <br /> 1991, ROY °F: WESTON, INC. (WESTON) proposes to install a single additional <br /> monitoring well and conduct near surface soil sampling;at the Grantline Plaza site. The <br /> proposed work'will be conducted in accordance with the previously approved Work Plan <br /> dated November 27, 1990. <br /> The monitoring well (designated MW-4) will be installed in a downgradient position to the <br /> sama'specifications as the.previously installed wells at:the site. The proposed location <br /> for MW-4 is shown on the attached map (Figure 1). This map indicates the locations of <br /> all previously installed wells and underground lines at the site. Product lines from the <br /> former UST ran directly up to the pump which was situated on top of the tank location, <br /> according to Souza Realty. <br /> To further assess the.potential that petroleum related contaminates may have migrated <br /> along underground lines, WESTON proposes to sample the fill material along these dines <br /> in two locations. These proposed sample locations are also shown on the attached map. <br /> This sampling will be conducted using a hand-operated, stainless steel auger and drive <br /> sampler to avoid damage to underground lines. <br /> Groundwater samples will be analyzed for benzene, toluene, ethylbenzene, and xylene <br /> (BTEX) by EPA Method 602, total petroleum hydrocarbons as gasoline (TPH-G) by EPA <br /> Method 8015,:and for Coliform bacteria. Soil sample's will be analyzed for benzene, <br /> toluene, ethylbenzene, and xylene (BTEX) by EPA Method 8020, and for total petroleum <br /> E; hydrocarbons as gasoline (TPH-G) by EPA Method 8015. <br /> f <br />