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CSUS-Multi Campus Regional Center Site Background Page 2 within a 2,000-foot radius of the site. The work flan was approved by Ms. Rebecca Setliff of the PHS/EHD in a letter dated November 14, 2001 to Mr. Cliff Bailey of CSUS. The recommended work was conducted in November and December 2001. Findings of the work were described in the Additional Soil and Groundwater Investigation and Monitor Well Installation Report, dated January 11, 2002, prepared by Condor. Results of the work indicated that site soil contamination was fully investigated but that groundwater contamination was not. Groundwater-contamination was present down to the total depth of the investigation (approximately 81 feet below the ground surface) and was present at the lateral bounds of the area investigated, particularly to the east, in the direction of the groundwater gradient indicated by the initial monitoring event. The sensitive receptor survey indicated the presence of several potential receptors, but no wells within close proximity to the site that had not been previously destroyed. The January 11, 2002 report recommended quarterly groundwater monitoring, additional lateral and vertical groundwater characterization, and soil over-excavation. The soil over-excavation was a suggested remedial alternative that was most likely to result in rapid mitigation of site contamination. The SJCEHD Ietter dated April 26, 2002 agreed with the monitoring and additional groundwater investigation portion of the recommendations, but requested study of the feasibility of at least two remedial options for the site. On June 28, 2002, a Condor representative was on site to measure water levels and collect water samples from the three monitor wells. A slight petroleum odor was noted in the field inspection sample collected from MW-3. The laboratory analytical results indicated that no petroleum hydrocarbon constituents were detected in the groundwater sample collected from monitor well MW-1. 1,2-dichloroethane (1,2 DCA) was detected in the groundwater sample collected from monitor well MW-2. Benzene, toluene, ethylbenzene, total xylenes (BTEX), TPH-G, methyl tertiary-butyl ether (MTBE), and 1,2-DCA were detected to the groundwater sample collected from monitor well MW-3 at concentrations consistent with those detected during the groundwater investigation conducted in December 2001. The groundwater gradient was calculated using depth to water measurements collected on June 28, 2002 at the three site monitor wells. The groundwater elevations generally indicated a groundwater gradient to the southeast. a s I