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1 .1 Scope of Work The scope of the site assessment was outlined in the Draft Additional Site ' Assessment and Quarterly Monitoring Work Plan, July 1993 (Work Plan) The field activities included ' 1 Collecting seven HydroPunch 1I® groundwater samples and submitting the samples to the District's laboratory for chemical analysis 2 Installing two groundwater monitoring wells ' 3 Collecting soil samples during the drilling of the monitoring wells at 5- ' foot intervals to the water table, and submitting the soil samples to the District's laboratory for chemical analysis ' 4 Developing and sampling the groundwater monitoring wells during the third quarter of 1993, and submitting the groundwater samples to the ' District's laboratory for chemical analysts 5 Collecting a composite soil sample and a composite groundwater sample and submitting the samples to the District's laboratory for waste profile characterization analysis 1 .2 Site Location ' The Stockton Service Center is at 1804 West Main Street, at the southwestern corner of the intersection of West Main Street and Lost Angeles Avenue in Stockton, ' California (Figure 1) The site is approximately 1,000 feet south of the Port of Stockton and the Stockton Deep Water Channel ' 1 .3 Site History The District uses the Stockton Service Center as an operations and ' maintenance yard The Stockton Service Center contains several buildings used for offices, maintenance garages, and storage (Figure 2) Formerly, three USTs and a pump dispenser were located adjacent to the shop and garage and were used for refueling vehicles The USTs were replaced by two above ground tanks In July 1987, the District removed one 1,000 gallon leaded gasoline UST from the Stockton Service Center Petroleum hydrocarbons in excess of detection limits ' 93R22 Last Say Municipal Utility District 40429500 asa 2 Stockton Svc Ctr -Site Assessment/Remedial Options