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Closure Summary Report UNIVERSAL SWEEPING SERVICES 1113 Shaw Road, Stockton, California 1.0. INTRODUCTION At the request of Mr.Joe Vella,Advanced Geo Environmental,Inc. (AGE)has prepared this Closure Summary Report (CSR) for 1115 Shaw Road, Stockton, California. Based upon the results of investigations of the former underground storage tank area at the site, it is AGE's opinion that a site closure is warranted for this facility. The site setting is illustrated on Figure 1; the former underground storage tank locations and existing site structure locations are depicted on Figure 2. This CSR has been prepared in accordance with the California Regional Water Quality Control Board (RWQCB) - Central Valley Region guidelines (Tri-Regional Board Staff Recommendations For Prelirninary�Investigations and Evaluation of Underground Tank Sites) for No Further Action Requests (See Appendix A). 2.0. BACKGROUND The site is bounded on the west by Highway 99 and on the east by Shaw Road. Light industrial facilities are located north and south of the property. A single large warehouse-type structure is located on the property. Universal Sweeping Services presently occupies this property,which was formerlythe site of Bobcat Central, an equipment sales and maintenance facility. 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, 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 being primarily continental. Continental-derived sediments were primarily deposited in lacustrine, 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 Advanced Gen Environmental,Inc.