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PROBLEM ASSESSMENT WORK PLAN California State University Stanislaus Multi-Campus Regional Center January 23, 2003 1.0 INTRODUCTION This Problem Assessment Work Plan(PAWP) was prepared by Condor Earth Technologies, Inc. (Condor) to describe additional groundwater investigation at the California State University Stanislaus (CSUS), Multi-Campus Regional Center (site) in Stockton, California. The site is located at the intersection of Aurora Street and Flora Street in the southeast portion of the campus (Figures 1 and 2, Appendix A). This PAWP was prepared at the request of Mr. David Rosso for the Trustees of the California State University in response to a letter dated April 26, 2002 from Rebecca Setliff of the San Joaquin County Environmental Health Department (SJCEHD). The purpose of the work is to further investigate the lateral and vertical extent of petroleum hydrocarbon contamination in groundwater at the site. The results of the additional groundwater investigation described by this PAWP will be presented in a Problem Assessment Report (PAR). The proposed work includes the installation of direct push borings to further evaluate the site hydrogeology and to collect discrete interval groundwater samples. The proposed work also includes the installation of at least one shallow monitor well and one deep monitor well to verify the results of the direct push sampling over time. As requested by the SJCEHD, this PAWP also includes a remedial feasibility 4 evaluation that compares and discusses remedial techniques for site clean up. ` All work conducted by Condor will be under the supervision of a California Registered Geologist. This work plan includes project background information, a description of the field, laboratory and reporting procedures proposed to conduct the work, a remedial feasibility evaluation, and a project schedule. 2.0 PROJECT 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 formerly containing diesel fuel. Tank 11 (TK11) was reportedly a 1,000-gallon capacity UST formerly containing gasoline. TK10 and TK11 were located adjacent to the north and south end, respectively, of the former fuel dispenser island. TK6 was located approximately 100 feet southeast of TK10, TK11, and the fuel dispenser island. ' On July 23, 1998 a Condor representative was on-site to collect soil samples from the excavations under i 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. Field observations and the laboratory analytical results of the soil samples indicated that further subsurface investigation of the TK6 and TK11 excavations was not necessary. Field observations and the laboratory i�l CONDOR