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l17l <br /> Quarterly Report - May 1999 <br /> WELDON CHURCH PROPERTY <br /> 104 West Beverly Place <br /> Tracy, California <br /> 1.0. INTRODUCTION <br /> At the request of Mr. Weldon Church,Advanced GeoEnvironmental, Inc. (AGE) has prepared this <br /> Quarterly Report for the site at 104 West Beverly Place, Tracy, California (the site). The scope of <br /> work included monitoring and sampling seven wells, obtaining laboratory analyses of the samples <br /> and preparation of this report. The site setting is illustrated on Figure 1. Locations of structures, <br /> borings and monitoring wells related to the site are illustrated on Figure 2. <br /> Site history and findings from previous investigations and previous monitoring events at the site are <br /> detailed in the Preliminary Investigation and Evaluation Report- September 1996 (PIER) prepared <br /> by AGE. <br /> 2.0. PROCEDURES <br /> The work was performed in accordance with San Joaquin County Public Health Services - <br /> Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control <br /> Board guidelines for investigation of underground storage tank (UST) sites. <br /> 2.1. MONITORING WELL PURGE PROCEDURES <br /> On 24 May 1999, a Solinst water level meter was used to measure the depth to ground water in each <br /> well relative to the tops of the well casings. After ground water depth measurements were collected, <br /> each monitoring well was purged using a two-stage submersible pump. Approximately 4 to 8 gallons <br /> of water were evacuated from each monitoring well (a minimum three well casing volumes), as <br /> appropriate for each well. <br /> Temperature, pH and conductivity were measured at 1-gallon or 2-gallon intervals, as appropriate, <br /> using an ICM model 52200 water analyzer to monitor stabilization of these ground water parameters. <br /> Field data logs are included in Appendix A. Purged water was temporarily stored on-site in 55-gallon <br /> drums. <br /> 2.2. COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br /> Water samples were collected from each monitoring well using new disposable bailers after allowing <br /> at the wells to achieve a minimum 80%recovery of the pre-purge water volume. The samples were <br /> transferred into 40-m1 EPA-approved vials containing 0.5 ml of 18% hydrochloric acid as a <br /> preservative. The sample vials were then labeled with the monitoring well designation, date, time <br /> Advanced CeoEnvironmental,Inc. <br />