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�y <br /> �1 <br /> Al <br /> Quarterly Report - First Quarter 1999 <br /> LANGSTON'S MARKET <br /> 15615 South 7 T1 Street, Lathrop, California <br /> 1.0. INTRODUCTION <br /> In accordance with the request of Mr James Langston of Langston's Market, Advanced <br /> GeoEnvironmental, Inc (AGE) has prepared this Quarterly Report for the property located at 15615 <br /> South 7`' Street, Lathrop, California The scope of work included quarterly ground water monitoring <br /> and preparation of this report The location of the site and the Immediately surrounding area are <br /> Illustrated on Figure 1, structures and monitoring well locations on the site are Illustrated on <br /> Figure-2 Background Information and details of previous investigation at the site are Included in the <br /> report titled Interim Secondary Source Removal and Monitoring Well Replacement,dated 05 October <br /> 1995 and several Quarterly Reports, prepared by WHF, Inc <br /> 20 PROCEDURES <br /> The San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) <br /> directed quarterly monitoring and ground water sampling events at the site Quarterly ground water <br /> monitoring was performed on 16 March 1999 Field work was performed in accordance with the <br />• San Joaquin County PHS-EHD and Central Valley Regional Water Quality Control Board <br /> (CVRWQCB) guidelines for the Investigation of underground storage tank (UST) sites <br /> 2 1 MONITORING WELL PURGE PROCEDURES <br /> On 16 March 1999, a Solmst water level meter was used to measure the depth to ground water in the <br /> four wells relative to the tops of the well casings The ground water elevations and gradient were <br /> determined from this data (Table 1) <br /> After recording water level measurements, a two-stage submersible pump was used to purge each <br /> monitoring well of standing water Approximately 30 gallons of water were removed from wells <br /> MW-1 and MW-2 Approximately 8 gallons of water were removed from wells MW-3 and MW-4 <br /> (approximately 3 well casing volumes) Ground water temperature, pH and conductivity were <br /> measured at regular Intervals during the purge process using a Hydac water analyzer Field data <br /> sheets are Included in Appendix A Purged water was stored on site in labeled, 55-gallon DOT- <br /> approved drums <br /> 22 COLLECTION AND LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Water samples were collected from each purged well using new disposable plastic bailers Each <br /> water sample was transferred into laboratory-supplied 40-m1 VOA vials containing 0 5 ml 18% <br /> Advanced GeoEnvi ro n mental,Inc <br />