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I " • • ILimited Subsurface Investigation Report ARROYO'S SMOG SHOP 3012 East Waterloo Road, Stockton, California 1.0. INTRODUCTION At the request of Mr Abelardo Arroyo of Arroyo's Smog Shop,Advanced GeoEnvironmental, Inc (AGE)has prepared the enclosed Limited Subsurface Investigation Report for 3012 East Waterloo Road, Stockton, California (site) The purpose of the Investigation was to determine if petroleum hydrocarbon-Impacted soil is present at the site The scope of work Included the Establishment of three soil borings,collection and analysis of soil samples and preparation of this report The location of the site is illustrated on Figure I A plan of the site Is Illustrated on Figure 2 This report has been prepared In accordance with guidelines Issued by the Central Valley Regional Water Quality Control Board (CVRWQCB) for subsurface investigations of underground storage tank (UST) systems 2.0. BACKGROUND The subject property,located at 3012 East Waterloo Road in an unincorporated portion San Joaquin County, California, is situated in an area of mixed commercial/residential and light industrial use Historical site usage research performed by AGE has Indicated that the property was utilized as a gasoline service station for approximately 40 years 21 REGIONAL GEOLOGIC/HYDROGEOLOGIC SETTING The site is situated within the southern portion of the Great Valley Geomorphic Province of California, a large, elongate, northwest trending, asymmetric structural trough, the northern and Isouthern portions of the Province have been designated the Sacramento and San Joaquin Valleys, respectively The Province is bordered by the Coast Ranges to the west,the Klamath Mountains and ' Cascade Range to the north, and the Sierra Nevada to the east The Great Valley has been filled with sediments derived from both marine and continental sources Thickness of the sedimentary fill ranges from thin veneers along the valley edges to more than 20,000 feet In the south central portion of the valley The sedimentary formations range in age from Jurassic to Recent,with the older deposits being primarily marine In origin and the younger deposits I being primarily continental Continental-derived sediments were primarily deposited in lacustnne, fluvial,and alluvial environments with sediment sources being the mountain ranges surrounding the valley(Olmsted and Davis, 1961),the site itself is located on unconsolidated and semi-consolidated ' alluvium, lake, playa and terrace deposits of Quaternary age (California Division of Mines and Geology, 1977) Rocks composing the basement complex of the Province have not been completely defined but are believed to be metamorphic and igneous in origin Advanced GeoEnwronmental,Inc I