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i Quarterly Report - Second Quarter 2005 PACIFIC PRIDE - SOUTH EL DORADO STREET 3147 South El Dorado Street, Stockton, California ' 1.0. INTRODUCTION Advanced GeoEnvironmental, Inc. (AGE) has prepared this quarterly report for 3147 South El Dorado Street (the site), Stockton, California. The site setting is illustrated on Figure 1. Site structures and monitoring well locations are depicted on Figure 2. ' The objective ofthe work was to monitor dissolved petroleum hydrocarbon concentrations in ground water and to characterize ground water flow direction and gradient on-site. This report has been prepared in accordance with guidelines issued by the Central Valley Regional Water Quality Control ' Board(CVRWQCB)for the investigation of underground storage tank(UST) sites. A summary of this site's UST investigation was previously included in Appendix A of Quarterly Report- First Quarter 2004, dated 24 September 2004. Previous soil characteristics data obtained by a CPT investigation enabled AGE to define four ' hydrogeologic units (CPT Site Investigation - Third Quarter 2001, dated 25 October 2001). The hydrogeologic units were defined as First Water Zone(35-55 feet bsg),Second Water Zone (60-80 feet bsg), Third Water Zone(90-100 feet bsg),and Fourth Water Zone(110 to at least 125 feet bsg). ' The followingis a brief summary of second quarter 2005 round water monitoring activities �' q g g performed at the site: ' 13 June 2005-Depth to water and total depth measurements were collected at wells MW-1 through MW-12 and ground water monitoring and sampling was performed at wells MW-1 through MW-12. 2.0. PROCEDURES ' On 13 June 2005, ground water monitoring was performed at the.site for monitoring wells MW-1 through MW-12; as-built monitoring well construction details are summarized in Table 1. Ground water monitoring procedures for the site were outlined in the AGE-prepared Monitoring Well ' Installation Work Plan - September 1999, dated 01 September 1999, and approved by the San Joaquin County Environmental Health Department(EHD)by letter dated 23 September 1999. 1 2.1. WELL MONITORING AND PURGING ' On 13 June 2005,depth to ground water was measured in each well from the top of the well casing to the nearest 0.01-foot utilizing a Solinst water level meter. Advanced GeoEnvironmental,Inc.