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i Quarterly Report —Fourth Quarter 2000 <br /> STRONG PROPERTY -rte <br />' <br /> 5.157 West Business Loop 205;Tracy, California . <br />' 1.0, INTRODUCTION ' <br />' At the request of Ms: Ruth Strong, Advanced GeoEnvironrnental, Inc. (AGE) has prepared this' <br /> quarterly report for the property located at 5157 West Business Loop 205, Tracy, California:The site <br /> and the surrounding area are illustrated in Figure 1. Structures and monitoring well locations are ; <br /> illustrated on Figure 2. <br /> Background information is summarized in the AGE-prepared' document titled Additional Site <br />' Assessment Work Plan Addendum, dated 01 July 2000. Quarterly monitoring data from July 1998 <br /> to the present is summarized in Tables 1 and 2 of this report. <br /> 2.0. PROCEDURES <br />' Field-work was performed in accordance with guidelines developed by the San Joaquiri County - <br /> Public Health Services - Environmental Health Department and the Central Valley Regional Water <br /> . Quality Control Board (CVRWQCB) for the investigation of underground storage tank(UST) sites. <br /> I <br />' 2.1. MONITORING WELL PURGE PROCEDURES <br /> .Ground water sampling of monitoring wells MW 1 through MW6 occurred on 05 December 2000. <br /> For the sampling event, a Solinst water level meter was used to measure the depth to groundwater <br /> I in the-six wells relative to the tops of the well casings. The ground water elevations and, gradient <br /> were determined from these data(Table 1): <br />' After recordin water Ievel measurements a submersible pump w. as used to purge each'monitorin <br /> g <br /> Well of standing water, Approximately 14 gallons of water(a minimum of 3 casing-water volumes) <br />' were removed from each well. Ground water temperature;pH and conductivity were measured at <br /> regular intervals during purging using a Hydac water'analyzer. Field sheets and data are included in <br /> Appendix A. Purged water was stored on-site in labeled,,55-gallon DOT-approved drums. <br /> ` 2:2. COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected from each purged well using new disposable plastic,bailers. 'Each <br />' water,sample�. was4ransfefred into one 1-liter amber bottle and three 40-m1 VOA vials confaining 0.5 ml 18% hydrochloric acid.as a sample preservative. After collection,.the samples were properly <br /> labeled, placed in a chilled container and transported under chain-of-custody to' McCampbell <br /> Advanced GeoEnvironmental,Inc. <br />