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' Quarterly Report - First Quarter 2005. <br /> . PACIFIC PRIDE - SOUTH EL DORADO STREET <br /> 3147 South El Dorado Street, Stockton, California <br /> 1.0. 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. <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 /> rBoard(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(I 10 to at least 125 feet bsg). <br /> I ' The following is a brief summary of first quarter 2005 ground water monitoring activities performed <br /> at.the site: <br /> • 15 March 2005-Depth to water and total depth measurements were collected at wells MW-2 <br /> through MW-12;Well MW-1 was inaccessible and could not be monitored this quarter;and <br /> • 15 March 2005- Ground water monitoring and sampling was performed at wells MW-2 <br /> through MW-7 and at wells MW-9 through MW-12. Wells MW-1 and MW-8 were <br /> inaccessible and could not be sampled this quarter. <br /> 2.0. PROCEDURES <br /> On 15 March 2005,ground water monitoring was performed at the site for monitoring wells MW-2 <br /> ' through MW-12; as-built monitoring well construction details are summarized in Table 1. Ground <br /> water monitoring procedures for the site were outlined in the AGE-prepared Monitoring Well <br /> Installation Work Plan - September 1999, dated 01 September 1999, and approved by the San <br /> ' Joaquin County Environmental Health Department(EHD) by letter dated 23 September 1999. ' <br /> Advanced GeoEnvironmeotal,Inc. <br /> I. <br /> 1 , <br />