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Geological Techs cs Inc, <br /> ' 1 101 V1 Street <br /> Modesto,California 95354 <br /> (209)5224119/Fax (209)S22-4227 <br /> REPORT <br /> ' Additional Site Characterization <br /> 4th Quarter 2003 Groundwater Monitoring <br /> Sinclair Trucking <br /> ' 3780 West Linne Road <br /> Tracy, California <br /> Project No. 1030.2 <br /> February 20, 2004 <br /> 1.0 INTRODUCTION <br /> The site has been undergoing investigation activities since 1995 when three monitoring <br /> wells and one soil boring were installed. Groundwater flow has been to the northeast for <br /> most of the site history. <br /> ' On June 14, 1995, Geological Technics Inc. (GTI) installed three monitoring wells and <br /> advanced one soil boring in order to evaluate the vertical and lateral extent of gasoline <br /> range petroleum hydrocarbons. <br /> ' On February 16, 1999, GTI personnel supervised the installation of one groundwater <br /> monitoring well downgradient of the former UST to further define the lateral extent of <br /> gasoline contamination in the soil and groundwater. This well shows low levels of gasoline <br /> ' range hydrocarbons. <br /> In response to a request by Mr. Ron Rowe of SJC PHS/EHD, GTI prepared a work plan on <br /> ' January 18, 2000, to define the lateral extent of the soil and groundwater contamination at <br /> the site. On April 20, 2000, Ms Lori Duncan of SJC PHS/EHD issued a letter denying the <br /> approval of the work plan. During phone conversations in May of 2000, Ms Duncan <br /> ' requested that a work plan be prepared for the installation of a deeper monitoring: well near <br /> the source to define the vertical extent of the contamination and the installation of a sentinel <br /> well between the source and the domestic well. <br /> GTI submitted a new,work plan on June 9, 2000, proposing the installation of a single deep <br /> monitoring well. Ms Duncan approved the work plan on June 28, 2000. <br /> ' A delay in the work plan implementation occurred due to a change in the Responsible Party. <br /> Cost pre-approval was obtained on October 28, 2001. <br /> 1 <br />