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Quarterly Report - September 1997 <br />' Gemelos Property (Paladin Center) <br /> 2421 East Holly Drive <br /> Tracy, California <br />' 1.0. INTRODUCTION'AND SCOPE OF WORK <br />' In accordance with the request of Mr` John Gemelos,Advanced GeoEnvironmental, Inc (AGE) has <br /> prepared the enclosed Quarterly Report for the site located at 2421 East Holly Diive, Tracy, <br /> California(the site) The objective of the investigation was to monitor the hydrocarbon-impacted soil <br />' and ground water at the site The scope of work included monitoring ground water conditions and <br /> collection and analysis of ground water samples <br />' The field work was performed on 23 September 1997 The location of the site is illustrated on Figure <br /> I - Location Map Structures, boring and monitoring well locations are shown on Figure 2 - Site <br /> Plan The work was performed in accordance with San Joaquin County Public Health Services - <br />' Environmentai'Health Division (PHS-EHD) and Central Valley Regional Water Quality Control <br /> Board guidelines for investigation of underground storage tank (UST) sites <br /> ISite history and findings from previous investigations and monitoring events at the site are detailed <br /> in the Preliminary Investigation and Evaluation Report dated October 1997 prepared by AGE <br /> 2.0. PROCEDURES <br /> 21 MONITORING WELL PURGE PROCEDURES <br />' On 23 September 1997, a Solinst water level meter was used to measure the depth to ground water <br /> in each well relative to the tops of the well casings The ground water elevation in each well was <br /> determined from these data Ground water elevations are summarized in Table I <br />' After ground,water depth measurements were collected, each monitoring well was purged using a <br />' two-stage submersible pump Approximately S gallons of water (minimum of 3 well volumes) were <br /> evacuated from monitoring wells MW-1 and MW-2 Due to poor well recharge, only two gallons <br /> of water were removed from monitoring well MW-3 Temperature, pH and conductivity were <br />' measured at 2-gallon intervals (except for MW-3), using an ICM model 52200 water analyzer <br /> These ground water parameters stabilized during purging and are tabulated in Appendix A Purged <br /> water was contained in 55-gallon drums for temporary storage on-site <br /> 2 2 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES <br />' Water samples were collected from each monitoring well using a new disposable bailer The samples <br />. were transferred into 40-m1 EPA vials containing hydrochloric acid as a preservative The samples <br />