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I S CSUS-Multi Campus Regional Center-Quarterly Groundwater Monitoring July 25,2002 Page 3 Table 2 Groundwater Analytical Results(June 28,2002) Sample Number MWl-6/28/02 MW2-6/28/02 MW3-6/28/02 Analyte Units-j 4g/L µWD ��L Benzene <0.5 <0.5 4.7 Toluene <0.5 <0.5 1.3 1lthylbenzene <0.5 <0.5 3.7 Total Xylenes <1.0 <1.0 4.6 TPH-G <50 <50 480 PH-0 <50 <50 <50 TPH-N10 <500 <500 <500 TPH-K <250 <250 <250- M BE <0.5 <0.5 190 Ethanol <13 <13 <25 Tertiary-Butanol <5.0 <5.0 <10 Di-isopropyl Ether <0.5 <0.5 <1.0 Ethyl tertiary-Butyl Ether <0.5 <0.5 <1.0 Tert-Amyl methyl Ether <0.5 <Q.5 <11.0 1,2-Dichloroethane <0.5 3.3 93 1.2-Dibromoethane <0.5 <0.5 <I.0 Unit Conversions: Analytical pg/L:parts per billion(ppb) TPH-G=total petroleum hydrocarbons,quantified as gasoline. TPH-D,K.MO=total petroleum hydrocarbons quantified as diesel(D),kerosene(K), motor oil(MO), MTBE=mehyl tert-butyl ether PROPOSED FUTURE WORK Based on the results of the current and historical groundwater monitoring data, Condor recommends that quarterly groundwater monitoring, including water level measurements and groundwater sampling at all site monitor wells, continue at the site. The next groundwater sampling event is scheduled for September 2002, In a letter dated April 26, 2002 to Mr. Cliff Baily of California State University Stanislaus, Rebecca Setliff of the SJCEHD requested that a work plan be submitted to further investigate the vertical and lateral extent of impacted groundwater, and to compare at least two different, but feasible, remediation alternatives for Mitigating contamination in the soil and groundwater at the site. Condor is currently preparing a Problem Assessment Work Plan (PAPW)to comply with Ms. Setliff s request. LIMITATIONS AND SIGNATURE Condor has endeavored to detcrlrtine as much as practical about the site within our scope of services using accepted principles and professional practice at the time the work was performed. Condor's involvement in the work performed for this report has been limited to collecting and recording system measurements and parameters; collecting and shipping samples; compiling field data and data provided by analytical laboratories; and interpreting field and laboratory data. Condor makes no representation as to the subsurface conditions at locations or times other than those sampled by our employees and reported in this document Condor is not responsible for the accuracy and completeness of information collected and developed by others. L4 CONDOR