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1.0 Introduction ' IT Corporation (IT) has prepared this Groundwater Monitoring Report for the second quarter 1997 groundwater monitoring and sampling event conducted at the former Fabncare site located at 711 South San Joaquin Street in the city of Stockton (San Joaquin County), California(Figure 1) This report was prepared for the San Joaquin County Public Health Services Environmental ' Health Division (PHS/EHD) as requested by Mr Anthony Varni, Esq of Varna, Fraser, Hartwell & Rodgers 2.0 Previous Work The site is a former textile processing and dyeing facility which utilized four (4) underground ' storage tanks (USTs), Tank A through Tank D Tank B, a 10,000 gallon diesel UST, was abandoned in place by Fabricare in 1974, prior to the enactment of current UST regulations On ' December 1, 1988, soil bonngs were dnlled in the vicinity of Tanks C and D, both 5,000 gallon diesel USTs Laboratory results from these soil borings indicate that low concentrations of ' toluene were present in the soil in the vicinity of Tanks C and D Tanks C and D were removed from the site circa 1991 Tank A was excavated and removed in January of 1989 Total Petroleum Hydrocarbons (TPH) ' as gasoline was detected at 2,000 parts per million(ppm) in a soil sample collected from the east end of the tank excavation Low concentrations of ethylbenzene,toluene, and xylenes were also detected in this soil sample A sample collected from the west end of the excavation did not ' contain detectable concentrations of petroleum hydrocarbons On August 2 and 3, 1989, one continuously cored soil boring and four other soil borings were drilled in the vicinity of the Tank A excavation to define the vertical and horizontal extent of impacted soil Toluene was the only petroleum hydrocarbon constituent present in soil samples collected from these borings The ' Tank A excavation was extended on April 4, 1990 Soil samples from this over-excavation were improperly collected and deemed invalid On July 2, 1990, three groundwater monitoring wells (MW-1 through MW-3) were installed in the vicinity of the Tank A excavation In addition, one soil boring (SB-1) was placed in the former excavation to verify the presence of clean backfill ' Toluene was detected in soil at a concentration of 0 077 ppm at a depth of 15 feet below ground surface (bgs) m MW-1 TPH-gasolme was detected in soil from SB-1 at a concentration of 12 ppm under the east end of the former Tank A at a depth of 30 feet bgs 1 1