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Additional Subsurface Investigation Report n ZE Auto Repair 16500 Clifton Court Road, Stockton, California 1.0. INTRODUCTION At the request of Mr Sam Abdo of ZE Auto Repan',Advanced GeoEnvi'onmental, Inc (AGE) has prepared this Additional Subsurface Investigation Report for 2255 South Airport Way, Stockton, California The scope of work included advancement of one soil probe boring, the collection and analysis of soil and ground water samples and preparation of this report The location of the site and ' its surroundings are Illustrated on Figure 1 Mayor features and soil boring locations on the site are illustrated on Figure 2 This investigation was performed m accordance with guidelines issued by the Central" Valley Regional Water Quality Control Board(RWQCB) for the investigation of underground storage tank (UST) sates 2.0. BACKGROUND � i The site Is located in a topographically flat area of Stockton, California (Figure 1), at northwest corner of the intersection of South Airport Way and 9th Street, It is presently utilized as an automobile repair facility Underground storage tanks (USTs) were formerly located at the property It as our understanding the site operated as a Beacon gasoline station between the 1950s and approximately 1982 In June 2002, AGE conducted a preliminary subsurface investigation at the site Six probe borings were advanced in the former UST excavation and near four former dispenser locations Total petroleum hydrocarbons quantified as gasolme (TPH-g) and purgeable aromatics ' including benzene, toluene, ethylbenzene and total xylenes (BTEX) were detected in soil samples collected from one boring advanced near,a former dispenser island Procedures and results of the preliminary investigation were presented in the AGE-prepared Phase II Site Assessment Report, dated 02 July 2002 „ 21 REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING f ' The site is s`Ituated within the Great Valley Geomorphic Province of California., a large, elongate, northwest trending, asymmetric structural trough The Great Valley Province has been filled with thick sequences of sediment ranging in age from Jurassic to Recent, creating a nearly flat- lying ' alluvial plain, extending from the Tehachapi Mountains in the south to the Klamath Mountains in the north The western and eastern boundaries of this province are comprised of the California Coast Range and the Sierra Nevada, respectively Rocks composing the basement complex of the province ' have not been completely defined but are believed to be metamorphic and igneous m orngin The ' Advanced GeoEnvlronmentan,Inc