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i GeologicalTecluuaI" Page 2 GW Monitoring Report Ted Peters -AST Project No 701 2 May 15, 2003 ifrom each of thirteen (13) boreholes Of these, ten soil and ten groundwater samples were analyzed for BTEX, TPH-G, TEPH-D and MTBE In addition, five soil and five i groundwater samples were also analyzed for gasoline oxygenates (MTBE, TAME, TBA, DIPE and ETBE), 1,2 DCA, and EDB utilizing EPA Method 8260B The Geoprobe effort resulted in the completion of the lateral definition of the soil plume i Gasoline range hydrocarbons detected in soils on the western portion of the site are anomalous and not consistent with the two known sources of petroleum fuels at the facility Diesel range petroleum hydrocarbons and gasoline oxygenates were not detected in any of ithe groundwater samples from the probe locations Based on the Geoprobe effort, GTI proposed two new monitoring wells one shallow well to be placed in the vicinity of the highest level of detected gasoline contaminants in the west portion of the site, and one deep well to be placed in the central portion of the site near the presumed source area of the diesel In his December 26, 2000, correspondence, Mr Joseph Mello of the CRWQCB-CVR denied the deep well and requested a second shallow iwell in the southwest portion of the site On March 21, 2001, GTI supervised the installation of two new monitoring wells, MW-7 & i MW-8 Groundwater monitoring events were conducted on March 29 and August 8, 2001, which included the new wells GTI documented the installation of the wells and the subsequent monitoring event in our "Soil & Groundwater Investigation" report dated April 20, 2001 The August 2001 monitoring event was documented in GTI's "Groundwater Monitoring — 3r`i Quarter 2001" report dated September 19, 2001 Both reports were submitted to the RWQCB-CVR and the SJC PHS/EHD i GTI submitted a March 3, 2002 "Soil Gas Survey"Work Plan to perform a soil vapor survey at the site This work plan was approved and the survey completed in May & June 2002 The soil gas survey data show that there are low concentrations of petroleum fuel contamination in the soil on the northwest corner of the property, a distinct node of gasoline i and diesel range hydrocarbons is present approximately 75 feet northeast of well MW-7, and that MTBE is not present in the soil vapor above the detection limit of the GoreSorbei Methodology utilized iThe CRWQCB-CVR issued an August 14, 2002, directive for a work plan to define the lateral and vertical extent of the groundwater plume GTI prepared our October 17, 2002 Work Plan for evaluating the extent of petroleum contamination at the property The work iplan includes piovisions for the installation of six additional monitoring wells The CRWQCB-CVR issued Monitoring and Reporting Program (MRP) Order No 5-01-868 i for the site on October 3, 2001 The MRP requires that quarterly monitoring reports be submitted to the RWQCB-CVR This report details the completion of the second quarter 2003 monitoring event performed on April 2, 2003, and is intended to satisfy the requirements of the MRP i 1