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r Geohgical7-echnics Inc. page 2 Initial Site Conceptual Model Project No. 1030.2 June 18,2003 the source to define the vertical extent of the contamination and the installation of a sentinel well between the source and the domestic well. 1 GTI submitted a new work plan on .lune 9, 2000, proposing the installation of a single deep monitoring well. Ms. Duncan approved the work plan on June 28, 2000. ' A delay in the work plan implementation occurred due to a change to the Responsible Party. ' Cost pre-approval was obtained on October 28, 2001. 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, SJC PHS/EHD, 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 SJC PH S/EHD, directed Sinclair Trucking to develop a ' site conceptual model. The following report incorporates data obtained during the project thus far, such as sensitive receptor information, interpretation of geologic formations at the site and how they contribute to transportation of contaminants, analytes al data, quantification of contamination known to be present, and df d transport model) " wl�.�•-t ,�,, tib- r ' 2.0 SOURCES OF CONTAMINATION 2.1 Historical Sources of Petroleum Hydrocarbons ' The Sinclair Trucking site formerly stored leaded gasoline on site in a 350-gallon UST. The UST was removed on March 31, 1987 and one soil sample was collected on April 1, 1987 from the excavation. ...TPH-G, .TEPH-D, .EDB and lead were detected in the original = -= sampling event. The location of the former tank is shown in Figure 2. Contamination was detected during the tank pull and was the source of historical petroleum hydrocarbons found ' at the site.