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Quarterly Repot - Third Quarter uarter 2000 <br />' K& S GAS & GROCERY <br /> 701 East Charter Way, Stockton, California <br />' 1.0. INTRODUCTION <br /> t At the request of Mr Khaldoon Othman of K & S Grocery, Advanced GeoEnvironmental, Inc <br /> (AGE) has prepared this quarterly report summarizing field activities performed during the third <br /> quarter of 2000 at 701 East Charter Way, Stockton, California. The scope of work performed on the <br /> site for the quarter included monitoring concentrations of dissolved petroleum hydrocarbons in <br /> ground water on the site and preparation of this report The site setting is illustrated in Figure 1 <br /> Structures and monitoring well locations are illustrated in Figure 2 <br />' Site background information was summarized in the AGE-prepared Monitoring Well Installation <br /> Report, dated 02 June 1999 <br />' 2.0. PROCEDURES <br />' All field 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 (CVRWQCB) guidelines for investigations of underground storage tank (UST) sites <br /> 2 1 MONITORING WELL PURGE PROCEDURES <br /> On 19 September 2000, a Solinst water level meter was used to measure the depth to ground water <br /> in monitoring wells MW1 through MW3,relative to the tops of the well casings (well heads) The <br /> ground water elevations and gradient were determined from these data (Table 1) <br />' After recording water level measurements, a two-stage submersible pump was used to purge each <br /> well of standing water The purge pump was placed near the top of the water column to remove <br /> water trapped within the unscreened section of the well casing Approximately 9 to 12 gallons of <br /> water (minimum of 3 casing-water volumes) were removed from each well Ground water <br /> temperature,pH and conductivity were measured at regular purge-volume intervals during purging <br /> using a Hydac water analyzer Field sheets and data are included in Appendix A Purged water was <br /> stored on-site in labeled, 55-gallon DOT-approved drums <br /> 2 2 COLLECTION OF GROUND WATER SAMPLES <br />' The depth to ground water was measured in each well following purging to assure a minimum of <br /> 80% recharge prior to sampling Water samples were then collected using new disposable plastic <br /> bailers Each water sample was transferred into 40-m1 VOA vials containing 0 5 ml 18% <br />' hydrochloric acid as a sample preservative After collection, the samples were properly labeled, <br /> Advanced GeoEnvironmentai,Inc <br />