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i <br /> Ile ADDITIONAL SITE ASSESSMENT - SECOND QUARTER 2000 <br /> K & S Gas & Grocery <br /> i701 East Charter Way, Stockton, California <br /> i1.0. INTRODUCTION AND SCOPE OF WORK <br /> i In accordance with the request of Mr Khaldoon Othman of K & S Gas & Grocery, Advanced <br /> GeoEnvironmental, Inc (AGE) has prepared this additional site assessment report for 701 East <br /> Charter Way, Stockton, California The scope of work included the advancement of two soil probe <br /> i borings (borings) and the collection and chemical analysis of soil samples. One boring (35) was <br /> advanced through the conductor casing located west of the current underground storage tank(UST) <br /> location, the other boring (Bb) was advanced near monitoring well MW3 This mvestigahon was <br /> i performed in preparation for installation of up to six additional groundwater morntonng wells The <br /> site location is illustrated on Figure 1 -Location Map Structures and soil probe boring locations are <br /> illustrated on Figure 2 - .Site Plan <br /> iField work was performed in accordance with Central Valley Regional Water Quality Control Board <br /> (CVRWQCB) guidelines for the investigation of UST sites <br /> i <br /> . 2.0. BACKGROUND <br /> iThe site is located in a flat, commercial area of Stockton, California on the northeast corner of <br /> Charter Way and Stanzslaus Street Three ground water monitoring wells(MW 1,MW2, and MW3) <br /> iwere installed on the property in December 1998, high concentrations of petroleum hydrocarbons <br /> have been detected in ground water samples collected at the wells The source of hydrocarbons has <br /> i not been determined, although it is likely that the original UST pit(location currently unknown), or <br /> the fuel dispenser areas could be the source area(s)of the hydrocarbon impact Though three ground <br /> water monitoring wells are currently located at the site,the extent of impacted soil and ground water <br /> ihave not yet been defined <br /> The latest quarterly monitoring(third quarter,2000)ofthe wells indicates that ground water occurred <br /> iat a depth of approximately 32 feet below the well heads and the flow direction was about due south <br /> i3.0. PROCEDURES <br /> Field work was performed in accordance with CVRWQCB and San Joaquin County Public Health <br /> i Services _ Environmental Health Division (PHS-EHD) guidhnes and as described in the AGE <br /> prepared Work Plan Addendum dated 10 September 1999,as approved by letter from PHS-EHD on <br /> 14 September 1999 <br /> I <br /> • <br /> Advanced GeoEnvtronmental,Inc. <br /> i <br />