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% %W111 <br /> Geotogccat Technics Inc. <br /> 2741 River Road <br /> Modesto.California 95351 <br /> (269)538-5424/Fax#538-5852 <br /> September 21, 2001 <br /> Project No. 320.2 <br /> Project Name: Del Tech (Sinclair&Thompson Property) <br /> Ms Linda Sanborn <br /> State Water Resources Control Board <br /> 2014 T Street, Suite 130 <br /> P.O. Box 944212 <br /> Sacramento, CA 94244-2120 <br /> Re: Cost Pre-Approval--Monitoring Well Installation and Groundwater Monitoring <br /> Sinclair& Thompson Property, 3780 W. Linne Road, Tracy, CA <br /> Claim No.: 8500 <br /> Dear Ms Sanborn: <br /> On behalf of Donald Sinclair and Shirley Thompson located at 3780 West Linne Road, Tracy, <br /> CA, Geological Technics Inc. (GTI) has prepared the following request for cost pre-approval <br /> for the installation of one deep monitoring well and one year of groundwater monitoring. <br /> Attached are copies of the work plan, approval letter, Il~B for drilling of the monitoring well, <br /> and the bid responses from V&W Drilling. <br /> Summary Work to be Performed To Date <br /> Geological Technics Inc. personnel supervised and directed a subsurface investigation at <br /> Sinclair and Thompson Property located at 3780 West Linne Road in Tracy, California. This <br /> work included the following: <br /> • Install three groundwater monitoring wells and one soil boring on June 14, 1995, to evaluate <br /> the extent of gasoline range petroleum hydrocarbons. <br /> • Collect soil samples on June 14, 1995 and groundwater samples were collected on June 23, <br /> 1995, and tested for TPH-G and BTEX. <br /> • The depth to groundwater was measured and the groundwater was shown to flow generally <br /> east northeast. None of the 3 wells are down gradient of the source. <br /> • Laboratory analytical data results have shown that the soil in all 4 boreholes and <br /> groundwater in the 3 monitoring wells are impacted by gasoline. <br /> • On February 16, 1999, MW-4 was installed at the site. Soil and groundwater samples <br /> showed the presence of low levels of BTEX and TPH-G. <br /> On December 8, 1999, Mr. Ron Rowe of SJC PHS/EHD issued a letter directing further <br /> investigation of the lateral extent of the soil and groundwater plume at the site. GTI prepared a <br /> work plan to complete this work. On April 20, 2000, Ms. Lori Duncan of SJC PHSIEHD issued <br /> a letter denying the approval of the work plan. During phone conversations in May of 2000, <br /> Ms. Duncan requested that a work plan be prepared for the installation of a deeper monitoring <br /> well near the source to define the vertical extent of the contamination and a sentinel well <br /> between the source and the domestic well. Prior to the preparation of this new work plan it was <br /> determined that the domestic well had been abandoned due to casing failure. GTI submitted the <br />