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Feasibility Studies and Monitoring Well Installation Work Plan PACIFIC PRIDE - SOUTH ELDORADO STREET (< l 3147 South El Dorado Street, Stockton, California 1 .0. INTRODUCTION Advanced GeoEnviromnental, Inc. (AGE) has prepared this work plan for installation of one ground water extraction well, two soil vapor extraction (SVE) wells, one air sparge well, one ozone sparge well and four multi-level ground water monitoring wells at 3147 South El Dorado Street, Stockton, [ California (the site). Following well installations, AGE will perform feasibility studies for ground I" 1 water corrective action including performance of a 24-hour ground water aquifer pumping test, performance of an eight-hour SVE pilot test, performance of a 48-hour in-situ air sparge (IAS) pilot test, performance of a coinciding SVE and IAS pilot test and performance of a 4-week in-situ ozone sparge (IOS) pilot test. The location of the site is illustrated on Figure 1 . A plan of the site is illustrated on Figure 2. The proposed scope of work is in accordance with a letter directive from the San Joaquin County Environmental Health Department (SJCEHD), dated 20 November 2001 (Appendix A). As part of a Corrective Action Plan (CAP) for the site, performance of the above referenced pilot tests are necessary to evaluate potential remediation options for soil and ground water at the site. Additional ground water monitoring wells are also required near the former UST area and northeast, east and ( southeast of the site to determine the lateral and vertical extent of petroleum hydrocarbon-impacted ground water. Upon completion of the feasibility studies and monitoring well 'installations, a _ Problem Assessment Report (PAR) and a Remedial Action Plan (RAP) will be prepared. This work plan is prepared in accordance with California Regional Water Quality Control Board - Central Valley Region (RWQCB) guidelines for the investigation of underground storage tanks (UST) sites. r 2.0. BACKGROUND -I The site is located at 3147 South E1 Dorado Street, approximately 200 feet south of the intersection of El Dorado Street and Ivy Avenue. The site is located in a topographically flat area at an elevation between-10-and-15-feet-above mearrsea level-in-Stockton, California (Figure-L)—. T-he-site-is nrthe - northeast quarter of Section 11 , Township 1 North, Range 6 East, Mount Diablo Base and Meridian I (Stockton West Quadrangle, 7, 5-Minute USGS Topographic Series, 1968, photo revised 1987). 2. 1, SITE DESCRIPTION The site is presently vacant, but was previously operated as a card-lock fueling station. One 10,000- gallon diesel UST, two 10,000-gallon gasoline USTs, dispensers and one building structure were formerly located on the property. - -� Advanced GeoEnvironmental, Inc. LJ