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i i 1.O INTRODUCTION 1.1 Background Information The project site is located at 3931 Newton Road, in an industrial area on the northeast oltskirts of Stockton near U S High„ay 99 The location of the site is shown in Figure 1, and the s&.- facilities are shown in Figure 2 Originally agricultural property, the site was developed as a commercial truck terminal in 1973 The property occupies an area of about 3 5 acres Topography in the area is generally flat, although the project site is ele,ated several feet above the adjacent parcels There is a maintenance building and office fronting Ne„rtOn Road, wi h a large unpaved storage yaid/patking lot in the rear A diesel and gasoline lueling facility, consist ng of two undeigiound stotate tanks (UST's), was formerly present on the east side of the stcrao e yaid (Figure 2) This facility ,was removed in 1989 and replaced with an above-ground fuelirg facility, which is located to the wA est of the abandoned facility Upgradrent Envirorniental Consultants (1Jpgradient) assumed the responsibility for asses.ment and monitoring of grout;dwater contamination at the facility in September 1994 In Noverrbet 1996, Upgradrent submintd. a P1 obleni A- ;w esvnert Repo,t, which was approved by San Joaquin County Public Health Ser,ices, Envirorurrental Health Division (PHS/EHD) in January 1997 PHS/EHD recommended that 'i Corrective Action Plan be submitted outlining the assessment, pres:nting the • results of a feasibility stu.ly of potential remediation methods, and discussing applicable cleanup goals For carious reasons, the project stalled at this point and no Corrective Action Plan was prepared Ground„ater monitoring continued sporadically through earl} 1998, but dLe to high water levels in the monitor wells, no samples were collected between November 1997 and March 1999 Monitoiing AAs renev%ed after a new„ell (GT-10) was installed in March 2.0 PROCEDURES Groundwater monitoring took place on June 14 The wells were opened and allowed to equalize with atmospheric pi essui e before water depths were measured The depth to groundwat�r in each well ,was measured with a Solinst ,water level mat r and the measurements were recorced on the Well Monitor Report (.Appendiv B) A Grundfos Readi-flo 2 groundwater pump was tht n used to purge 12 gallons from GF-6, 16 gallons from GT-2, 17 gallons from GT-3, 16 gallons t om GT-1 and Gr-5, and 32 gallons from GT-10 Conductivity, pH, and temperature were measured dunng purging at 4-gallon intervals, and the readings were recorded on the Well Monitor Rt port The water „as stored in 55-gallon drums near GT-6 Monitor well GT-9 and drinking water wells G-1 and Barbot(on the adjacent property)were sampled but not purged After purging watei samples were collected in disposable plastic bailers and placed in st,,-rilized 1- liter amber bottles Samples from GT-1 and GT-10 were also collected in 40-m1 glass vials The samples were placed in a plastic cooler iced, artd shipped to McCampbell Analytical it Pacheco, • Calitornia foi analysis All nine of the samples .were analysed for TPH-diesel, but the san ples from 2