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Additional Site Assessment Work Plan SPINGOLO TRUCKING COMPANY 1011 North Broadway Avenue, Stockton, California 1.. 1.0. INTRODUCTION At the request of Mr.Frank Spingolo of Spingolo Trucking Company,Advanced GeoEnvironmental, Inc.(AGE)has prepared the enclosed Additional Site Assessment Work Plan for the property located L' at 11.01 North Broadway Avenue,Stockton,California.The scope of work includes the installation, development, and survey of three ground water monitoring wells at the above-referenced site. The location of the site is illustrated on Figure 1.plans of the site, including proposed monitoring well locations, are illustrated on Figures 2 through 4. � This work plan is prepared in accordance with Central Valley Regional Water Quality Control Board (CVRWQCB)guidelines for the subsurface investigation of underground storage tank(UST)sites. r 2.0. BACKGROUND The site is located in a topographically flat area of Stockton, California(Figure 1), approximately 400 feet south of the intersection of Broadway Avenue and Roosevelt Street. The site is further described as being located in the southwest quarter of Section 54,Township 2 North,Range 7 East, t., Mount Diablo Base and Meridian(Stockton East Quadrangle,7.5-Minute USGS Topographic Series, 1968,photo revised 1987).. 1 +� The site is presently utilized as a truck depot for freight transportation and consists.of several structures utilized for office space,truck maintenance and a storage yard. Two 6,000-gallon diesel USTs,one 2,000-gallon gasoline UST,and one 500-gallon waste oil UST-were formerly located on the northern portion of the.property. One 500-gallon gasoline UST was formerly located in the , southern portion.of the.property.Former tank locations are illustrated on Figures 2 through 4. 2.1. 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 southern 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 f 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, Advanced GeoEnvironmental,Inc. r