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1 <br /> I <br /> ' Quarterly Report - Third Quarter 2005 <br /> PACIFIC PRIDE - SOUTH EL DORADO STREET <br /> ' 3147 South El Dorado Street, Stockton, California <br /> ' 1.4. INTRODUCTION <br /> Advanced GeoEnvironmental, Inc. (AGE) has prepared this quarterly report for 3147 South.El <br /> ' Dorado Street (the site), Stockton, California. The site setting is illustrated on Figure 1. Site <br /> structures and monitoring well locations are depicted on Figure 2. r <br /> ' The objective of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground <br /> water and to characterize ground water flow direction and gradient on-site. This report has been <br /> prepared in accordance with guidelines issued by the Central Valley Regional Water Quality Control <br /> Board(CVRWQCB) for the investigation of underground storage tank(UST) sites. A summary of <br /> this site's UST investigation was previously included in Appendix A of Quarterly Report-- First <br /> Quarter 2004, dated 24 September 2004. <br /> Previous soil characteristics data obtained by a CPT investigation enabled AGE to define four <br /> hydrogeologic units (CPT Site Investigation - Third Quarter 2001, dated 25 October 2001). The <br /> ' hydrogeologic units were defined as First Water Zone (35-55 feet bsg),Second Water Zone(60-80 <br /> feet bsg), Third Water Zone(90-100 feet bsg),and Fourth Water Zone(110 to at least 125 feet bsg). <br /> • The following is a brief summary of third quarter 2005 groundwater monitoring activities performed <br /> at the site: <br /> t - 22 September 2005- Depth to water and total depth measurements were collected at wells <br /> MW-1, MW-4 and MW-6 through MW-12. <br /> ' - 23 September 2005-Groundwater samples were collected at wells MW-1,MW-4 and MW-6 <br /> through MW-12. <br /> ' - Wells MW-2, MW-3 and MW-5 could not be monitored or sampled this quarter. The wells <br /> were inaccessible due to commercial vehicle parking at the site. <br /> 2.0. PROCEDURES <br /> On 22 September 2005, ground water monitoring was performed at the site for monitoring wells <br /> MW-1, MW-4 and MW-6 through MW-12; as-built monitoring well construction details are <br /> ' summarized in Table 1. Ground water monitoring procedures for the site were outlined in the AGE- <br /> prepared Monitoring Well Installation Work Plan-September 1999, dated 01 September 1999,and <br /> approved by the San Joaquin County Environmental Health Department (EHD) by letter dated 23 <br /> ' September 1999. <br /> Advanced GeoEnvironmental,Inc. <br /> 1 <br />