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REVISED WORKPLAN FOR CLARKE SITE 729 South Commerce, Stockton SITE DESCRIPTION The site has a car towing business on the parcel. The site located in the topographically flat, commercial/residential area of central Stockton. The car towing establishment is on the northern side of the building located in the southwest corner of the intersection of South Commerce and Scotts Street. Figure 1 presents a location map of the site. The site is underlain by the Calaveras River Alluvium which is part of the regional Quaternary-age Modesto Formation. Regionally, this unit ranges from clays to gravels, however only silt and clay were reported as being encountered during the Underground Storage Tank (UST) removal. During normal rainfall years, depth to groundwater is estimated to be approximately 40 feet below the ground surface. During the present drought years the depth appears to be greater and is reported at approximately 45 ft at a site just to the east. PREVIOUS INVESTIGATION Two UST were removed from this site by Oil Equipment Service on April 13, 1992. One 3000 gallon tank contained gasoline and the other 550 gallon tank contained diesel. UST locations are shown in Figure 2. The UST removed were reported to be in excellent condition. Soil samples collected from the excavation were analyzed The results reported from the soil samples analysis indicated low levels of total petroleum hydrocarbon as gasoline (TPHG) ; oil and grease (TOG) ; Benzene, Toluene, Ethylbenzene and Xylene (BTEX) contamination. The lead concentration levels in the analyzed soil samples appear to be background. The over excavated soil from the UST removal was sampled and the analysis, including a fish bio-assay test, indicated the soil to be non-hazardous. The soil has been removed from the site. The parcel now has space to place the Monitoring Wells on it.