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IMonitoring Well Installation Report • K & S GAS & GROCERY ' 701 East Charter Way, Stockton, California ' 1.0. INTRODUCTION At the request of Mr Khaldoon Othman of K & S Gas & Grocery,Advanced GeoEnviromnental, ' Inc (AGE) has prepared this Monitoring Well Installation Report for the property located at 701 East Charter Way, Stockton, California ' Three ground water monitoring wells were installed at the site on 02 and 03 December 1998 Ground water monitoring was performed on 16 December 1998 The site and the surrounding area are ' illustrated in Figure 1-Location Map Structures,well and boring locations are illustrated on Figure 2 -Site Plan ' 2.0. BACKGROUND ' The site is located in a commercial area of low topographic relief in Stockton, California, on the northeast corner of Charter Way and Stanislaus Street Two 12,000-gallon single-walled gasoline • USTs were installed at the site in 1972 One 1,000-gallon double-walled UST was installed at a later time at the site On 19 June 1997, four soil probe borings (probings)were advanced at the site near the 12,000-gallon USTs Three probings were advanced to a vertical depth of 20 feet below surface grade (bsg), due to the presence of hydrocarbon odor, one probing (132) was advanced to a vertical depth of 45 feet bsg TPH-g was detected at depths of 30 and 40 feet bsg at concentrations of 460 parts per million (ppm, reported as milligrams per kilogram) and 1,000 ppm, respectively, beneath the south ends of the USTs Petroleum hydrocarbons were not detected at a depth of 45 feet bsg or in samples ' analyzed from the three other probings Soil probe boring installations were described in the Preliminary Site Assessment Report prepared by AGE in August 1997 ' The three underground storage tanks (USTs) were removed from the site on 13 February 1998 Petroleum hydrocarbons were detected in soil samples collected from below the two 12,000-gallon USTs at concentrations as high as 1,400 ppm Petroleum hydrocarbons were not detected beneath ' the 1,000-gallon UST ' One 20,000-gallon UST was installed at the site following the 1998 UST removals Approximately 341 tons of hydrocarbon-impacted soil were excavated during removal of the old USTs and overexcavation for the installation of the new UST and piping Soil was disposed at Forward ' Landfill During the UST installation, two conductor casings were installed through the pea gravel . adjacent to the UST in anticipation of future site assessment need The UST removal,overexcavation and UST installation were described in the UST Removal Report, dated 26 May 1998, prepared by ridranced GeoEnN Eronmental,Inc