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LM u WORK PLAN SOIL AND GROUNDWATER REMEDIATION r. CALIFORNIA STATE UNIVERSITY STANISLAUS MULTI-CAMPUS REGIONAL CENTER STOCKTON, CALIFORNIA L. 1.0 INTRODUCTION Condor Earth Technologies, Inc. (Condor) prepared this work plan at the request of Mr. David Rosso for Los the Trustees of the California State University. This work plan describes proposed soil and groundwater remediation activities to be conducted at the California State University Stanislaus (CSUS), Multi- Campus Regional Center (site) in Stockton, California (Figure 1, Appendix A). The site is located at the intersection of Aurora Street and Flora Street in the southeast portion of the campus (Figure 2, Appendix A). The scope of work described in this work plan includes (1)groundwater dewatering including installation of dewatering wells, groundwater treatment, and proper disposal of treated groundwater; (2) soil over- excavation, including transport and disposal of contaminated soil near the former UST location (Figure 3, k. Appendix A); and, (3) in-situ groundwater remediation after completion of soil excavation and backfill utilizing ozone sparging technology. v All work conducted by Condor will be performed under the supervision of a California Registered Geologist. The fieldwork and reporting will be conducted in accordance with San Joaquin County Environmental Health Department (SJCEHD) guidelines and requirements. This work plan includes site background information, a description of the site geology, and a description of the proposed fieldwork, laboratory analyses, and reporting. Drilling logs for soil investigations performed from December 28, 2000 through December 11, 2001, are found in Appendix B, and historical soil sample laboratory analytical results are provided in Appendix C. Lo 2.0 SITE BACKGROUND The site contained three underground storage tanks (USTs) associated with past uses of the site. On July 22, 1998 Henderson Construction of Stockton, California removed all three USTs from the site, each from a separate excavation. A fuel dispenser island was also removed. Tank 6 (TK6) reportedly contained fuel oil for a generator room. Tank 10 (TK10) was reportedly a 10,000-gallon capacity UST formed containing diesel fuel. Tank 11 TKI1 was reportedly a 1,000-gallon ca aci UST formed Y g ( } P Ycapacity Y containing gasoline. TK 10 and TKI I were located adjacent to the north and south end, respectively, of the former fuel dispenser island. TK6 was located approximately 100 feet southeast of TK 10, TK 11, and the fuel dispenser island. On July 23, 1998 a Condor representative was on-site to collect soil samples from the excavations under the direction of Ms. Letitia Briggs of the SJCEHD. The soil samples were analyzed by APCL of Chico, California. Henderson Construction prepared a brief letter report, dated August 31, 1998, describing the UST removal activities, soil sampling activities, and laboratory analytical results of the soil samples. L 1 j +.� CONDOR