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RA <br /> Quarterly Report - Second Quarter 2000 <br /> LANGSTON'S MARKET <br /> 15615 South 7r" 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`h Street,Lathrop, California The scope of work included quarterly ground water monitoring, <br /> performance of a sensitive receptor survey, and preparation of this report The location of the site <br /> and the immediately surrounding area are illustrated on Figure 1, structures and monitoring well <br /> locations on the site are illustrated on Figure 2 Background information and details of previous <br /> investigation at the site are included in the report titled Interim Secondary Source Removal and <br /> Monitoring Well Replacement, dated 05 October 1995 and several Quarterly Reports, prepared by <br /> WHF, Inc <br /> 2.0. PROCEDURES <br /> The San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) has <br /> directed by letter dated 08 May 2000 that quarterly monitoring and ground water sampling events <br /> be enacted at the site immediately Quarterly ground water monitoring was performed on 12 June <br /> 2000 Field work was performed in accordance with the San Joaquin County PHS-EHD and Central <br /> Valley Regional Water Quality Control Board (CVRWQCB) guidelines for the investigation of <br /> underground storage tank (UST) sites <br /> 2 1 MONITORING WELL PURGE PROCEDURES <br /> On 12 June 2000, a Solinst 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 /> Advanced GeoEnvironmental,Inc <br />