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IQuarterly Report - First Quarter 2000 • Former Curtiss Pontiac-Buick 2450 Toste Road, Tracy, California 1.0 INTRODUCTION At the request of Mr Joe Toste, Advanced GeoEnvir onmental, Inc (AGE) has prepai ed this IQuarterly Report foi 2450 Toste Road, Tracy, California(the site) The scope of work included the sampling often ground water monitoring wells The site setting is illustrated in Figure 1 A plan view of the site is illustrated in Figure 2 A summary of previous investigations at the site is included in the Preliminary Investigation and Evaluation Report(PIER),prepared by AGE,dated 15 August 1997 and Quarterly Report,prepared by AGE, dated 18 Septembei 1997 Ground water monitoring data collected from monitoring well MW-3,which is part of the underground storage tank(UST)release investigation at 2420 Grant Line I Road, Is included in this investigation to delineate the down gradient extent of the dissolved hydrocarbon plume and to determine ground water flow direction and gradient I This report is pi epar ed in accordance with Central Valley Regional Water Quality Control Board and San Joaquin County Public Health Services-Environmental Health Division(PHS-EHD) guidelines � i 2.0. PROCEDURES ' 2 1 GROUND WATER DEPTH MEASUREMENT AND PURGING On 17 Mai ch 2000, a Solinst water level meter was used to measure the depth to ground watei in each well relative to the top of the well casing After ground water depth measurements were collected,monitor Ing wells MW-I through MW-7 were purged using a two-stage submersible pump I Five to six gallons of water(a minimum of 3 well volumes per well) were evacuated from wells MW- F B,MW-2B, and MW-3 through MW-7, and twelve gallons of water were purged fi om MW-l A and MW-2A ' Temperature, pH and conductivity were measured at 2-gallon intervals in wells MW-i B, MW-213, and MW-3 through MW-7, and at 3-gallon intervals in wells MW-I A and MW-2A The field data ' wei e measured with a Hydac water analyzer Logs of the field data are included in Appendix A Purged water was stored on-site in labeled 55-gallon drums ' 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES ' Water samples were collected from each well using a new disposable plastic bailer Each water sample was transferred into three 40-m1 VOA vials containing 0 5 ml 18% HCL as a sample pi esei vative and one I-liter amber bottle without preservative Aftei collection, the samples wei e ' Advanced GeoFn-stronnlental Inc 1