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C�eolagicatTeclucicsficc. - Page 2 Additional Site Characterization &4"Quarter Groundwater Monitoring Project No. 1030.2 February 20,2004 In April of 2002, GTI and V&W Drilling installed one deep monitoring well to 35 feet below grade (MW-101). On June 18, 2002, GTI prepared and submitted the Site Characterization, Monitoring Well Installation and Groundwater Monitoring Report ' documenting the work performed during April of 2002. The report recommended continued groundwater monitoring and testing for biodegradation indicators. The recommendations were approved by Ms Lori Duncan in a letter dated July 22, 2002. ' On September 30, 2002, GTI prepared and submitted the 3`d Quarter 2002 Groundwater Monitoring Report recommending the site be considered for closure. The request was denied by Ms Duncan in a letter dated March 3, 2003. A meeting was scheduled between ' Mr. and Mrs. Sinclair, Ms Duncan and Eric Price of GTI for March 27, 2003 to discuss the direction of the project and remediation alternatives. ' On March 3, 2003, Lori Duncan directed Sinclair Trucking to develop a site conceptual model. In addition to the site conceptual model, Ms Duncan requested investigation of a potential NNW/SSE trending sand channel. GTI prepared and submitted the Initial Site ' Conceptual Model on June 18, 2003. On June 24, 2003, GTI prepared and submitted the Monitoring Well Installation & Geoprobe Investigation Work Plan. Ms Duncan approved the work plan in the letter dated ' July 18, 2003, with the following caveats (in summary): • Install one shallow monitoring well to a depth of 20 feet bgs and add it to the existing routine quarterly groundwater monitoring and sampling program. • The GeoProbe soil borings are to begin within five feet of previously encountered soil contamination. • SJC/EHD does not approve the collection of groundwater samples from these borings. ' • Submit cost comparisons for the remedial alternatives discussed in the submitted Feasibility Study dated June 25, 2003. r Two borings should be advanced at locations requested by SJC/EHD in the March 3, ' 2003 correspondence, to investigate the possible NNW/SSE trenching channel. The following report documents the work performed at the Sinclair Trucking site in ' accordance to the June 24, 2003, work plan and the 4" quarter groundwater-monitoring event. ' 2.0 SOIL & GROUNDWATER INVESTIGATION ' On November 12, 2003, Geological Technics Inc. supervised the installation of one shallow groundwater-monitoring well (MW-5). The location of the new monitoring well is shown on the site snap (Figure 2). Monitoring well permits were secured from the San Joaquin County Environmental Health Department (SJC/EHD). The local regulatory agency was notified 48 hours prior to commencing work. The subsurface was cleared of underground utilities by notifying ' Underground Service Alert.