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M. Scott Mansholt - 2 - 10 February 2005 <br /> ChevronTexaco <br /> Former TAOC Pump Station <br /> 1.06 feet of floating product. In December, product was measured at 0.68 and 0.28 feet respectively for <br /> REW-2 and REW-3. Approximately two gallons floating product was removed from REW-2 and <br /> slightly less than one gallon from REW-3 this quarter. According to the report, the amount of product <br /> measured for the one month interval of November to December, suggests that the increased removal <br /> frequency may result in a decrease of product thickness in the wells. These findings and future product <br /> removal frequencies will be reevaluated following review of the Q1 2005 monitoring and product <br /> removal report. <br /> Geomatrix is planning to implement a soil and groundwater investigation(Work plan approved by <br /> Regional Board staff, 3 June 2004) to evaluate the extent of impacts north-northwest, downgradient of <br /> the site. Currently, ChevronTexaco and UPRR are in the process of obtaining access to the properties to <br /> be investigated. <br /> Quarterly groundwater monitoring and product removal will continue until further notice. Product <br /> removal was completed on 20 January 2005 and the next quarterly monitoring and sampling <br /> event/product removal will be conducted 16 February 2005. <br /> Based on our review we have the following comments: <br /> • The report stated that the fencing surrounding the site is inspected monthly and that during the <br /> December 2004 inspection, fence damage was noted and repairs were to be completed the <br /> following month. The purpose of the fencing is to prevent unauthorized access. In the future, <br /> when fence damage is noted,repairs should be implemented immediately. <br /> If you have any questions please call Dean Hubbard at (559) 445-5179. <br /> SHELTON R. GRAY / C. DEAN HUBBARD <br /> Senior Engineering Geologist Engineering Geologist <br /> RG 6357 <br /> cc: Michael Infurna, Jr., San Joaquin County EHD, Stockton <br /> Gary Foote, Geomatrix, Oakland <br /> Luis Mercado, SAIC, Sacramento <br />