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QUARTERLY GROUND WATER MONITORING <br /> April and July 1995 <br /> 4648 Waterloo Road <br /> Stockton, California <br /> 1.0. INTRODUCTION/SCOPE OF WORK <br />' In accordance with the request of Jonathan Marlowe,Advanced GeoEnvironmental, Inc (AGE) has <br /> performed quarterly ground water morutoring procedures at 4648 Waterloo Road in Stockton, <br /> California (the site) This report details monitoring and sampling activities performed at the site in <br /> April and July 1995, and presents the results of both laboratory analyses The monitoring and <br /> sampling was performed in accordance with San Joaquin County Public Health Services - <br />' Environmental Health Division(PHS-EHD) and Regional Water Quality Control Board (RWQCB) <br /> guidelines <br /> 2.0. BACKGROUND <br />' 21 SITE LOCATION <br />�y The site area is located on the south side of Waterloo Road, east of Highway 99, in a flat <br /> rural/industrial area east of Stockton, California (Figure 1) A large warehouse, a small office <br /> building, two fenced storage yards and a parking/delivery area are present on the site A site plan <br />' depicting the structures and location of monitoring wells is given as Figure 2 <br /> 2 2 PREVIOUS WORK <br /> In January 1988, one 550-gallon waste gasoline Underground Storage Tank (UST) was removed <br /> from the site Total petroleum hydrocarbons quantified as gasoline (TPH-g) was detected beneath <br /> the UST A ground water monitoring well (MW-1) was subsequently installed southwest of the <br /> former UST location TPH-g was detected in both soil and ground water samples collected from <br /> MW-1 Due to decreasing water table, this well became dry <br /> In December 1992, a second ground water monitoring well (MW-2) was installed to replace MW-1 <br /> Petroleum hydrocarbons were not detected in soil samples collected during the construction of MW- <br /> 2, however, benzene and halogenated hydrocarbons were detected in a ground water sample collected <br /> in January of 1993 from this well MW-2 Monitoring well MW-2 was sampled again in April of 1993 <br /> and slight increases in these constituents were reported <br /> Two additional monitoring wells(MW3 and MW4)were installed at the site on 29 and 30 September <br /> 1993 TPH-g and aromatic hydrocarbons(benzene, toluene, ethylbenzene and xylenes BTE&X) were <br /> not detected in any of the soil samples analyzed A single halogenated hydrocarbon compound, <br />