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• Interim Soil Remediation Work Plan - South UST Area FIRE STATION #2 110 West Sonora Street, Stockton, California 10. INTRODUCTION At the request of the City of Stockton Public Works Department and Fire Prevention Department, Advanced GeoEnvironmental,Inc (AGE)has prepared the enclosed Interim Soil Remediation Work Plan-South USTArea for the property located at 110 West Sonora Street, Stockton,California(the site) The location of the site is illustrated on Figure 1 and a plan of the site is illustrated on Figure 2 The scope of work includes soil excavation, soil sample collection and analysis, and disposal of impacted soil Currently, site improvements, including a significant driveway improvement, are being completed in the area of the former south UST dispenser lines, the proposed interim remediation would be conducted concurrently with the site improvements This work plan provides procedures for the recommendation included in the AGE-prepared Preliminary Site Assessment Report, dated 12 August 2002, and was prepared in accordance with the California Regional Water Quality Control Board - Central Valley Region (CRWQCB-CR) • guidelines for the investigation of UST sites 2.0. BACKGROUND The site is bounded on the north by Sonora Street, on the west and south by Madison Street and on the east by Commerce Street Presently a single building is located at the northern portion of the site, occupied by the City of Stockton - Fire Prevention Department A diesel/gasoline fueling system previously occupied the northwestern portion of the site, a petroleum hydrocarbons release from the associated underground storage tanks (USTs) is presently being remediated The properties surrounding the site are mostly industrial, with a few residences east of the site 21 PREVIOUS INVESTIGATIONS During redevelopment construction on the southeastern portion of the site, a former accelerant fuel line used for fire training was discovered The product line was uncovered, removed and soil was sampled and analyzed for petroleum hydrocarbons In addition, a former UST location was discovered at the eastern end of the pipeline during the pipeline removal, this location was re- excavated and a soil sample was collected and analyzed Based on laboratory analytical results Total petroleum hydrocarbons as diesel and motor oil (TPH-d and TPH-mo)were detected at concentrations of 2,300 milhgrams/kilogram(mg/kg) and 4,000 mg/kg,respectively, and Advanced GeoEnvu0==taL Inc