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IQuarterl Re August 1.997 Y Report - g FORMER CHASE CHEVROLET (VAN BUREN) FACILITY 424 North Van Buren Street, Stockton, California I10 INTRODUCTION In accordance with a request from Mr Jeffery Setness of Hartmann & Setness, Advanced GeoEnviroaunental, Inc (AGE) has prepared this Quarterly Report summarizing field activities performed during the third quarter of 1997 at 424 North Van Buren Street, Stockton, California (Figure I -Location Map) The scope of work included monitoring ground water, collecting ground water samples,obtaining laboratory analyses of the samples and preparation of this report Structures and monitoring well locations on the site and adjacent area are illustrated in Figure 2 - Vicinity Map IField activities were perforned in accordance withg uidelines for investigation of underground storage tank (UST) sites established by both the Central Valley Regional Water Quality Control ' Board (CVRWQCB) and the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) Background information was summarized in the Coi i ective Action Plan - IDecenibei 1996 prepared by AGE 20 PROCEDURES 2 1 MONITORING WELL PURGE PROCEDURES On 05 August 1997, a Solinst water level meter was used to measure the depth to ground water in each well relative to the tops of the well casings An Ullage interface probe was used to check for I the presence of free product in MW-3 and MW-9 The relative ground water elevations and hydraulic gradient were determined from these data (Table 1) ' On 06 August 1997, each monitoring well was purged using a two-stage submersible purge pump ' The pump was decontaminated prior to purging each well using an Alconox solution and clean tap ' water Temperature, pH and conductivity of purged water were measured at regular intervals during purging using an ICM model 52200 v4ater analyzer Ten to twelve gallons of water (minimum of tluee well volumes) were removed from each well Fifty gallons of water were purged from MW-9 All purged water was stored in 55-gallon DOT drums on-site Stabilization data and field logs are included in Appendix A 22 COLLECTION OF GROUND WATER SAMPLES ' Water samples were collected from each well using new disposable bailers and upon retrieval were . transferred into 40-m1 EPA-approved VOA vials containing 0 5 ml of 18% hydrochloric acid as a preservative The samples were labeled and transported under chain-of-custody, in a chilled Advanced GeoEniironmenInI,Inc