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• Ce06glcat ToCha Ics In C. <br /> ' 1101 7`4 Street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> ' REPORT <br /> ' Groundwater Monitoring <br /> 3rd Quarter 2005 <br /> Valentine (Castle Motors) <br /> 2315 N. El Dorado St. <br /> ' Stockton, CA <br /> Project No 723 2 <br /> October 25, 2005 <br /> EXECUTIVE SUMMARY <br /> ' This report summarizes the 3`d Quarter 2005 groundwater monitoring event that took place <br /> on August 26, 2005 <br /> ' The laboratory results indicate that detectable concentrations of the aromatic hydrocarbon <br /> compounds (BTEX) and gasoline range petroleum hydrocarbons (TPH-G) are present in all <br /> six shallow/intermediate monitoring wells on site On site deep well MW-101 intermittently <br /> ' contains contaminants and it continues to contain low levels TPH-G Deep well MW-201 did <br /> not contain contamination for the event <br /> ' The presence of TPH-G in cross gradient well set MW-7/107/207 probably represents the <br /> lateral spreading edge of the advancing plume The presence of TPH-G in up gradient well <br /> set MW-9/109/209 well set probably represents dispersion above the fluctuating water table <br /> The down gradient well set, MW-81108/208, shows substantial levels of TPH-G <br /> contamination in the intermediate and deep well Shallow well MW-8 was dry for the event <br /> ' The groundwater elevation averaged -25 08 feet mean sea level in the shallow wells and this <br /> corresponds to about 35 feet below grade surface (bgs) This elevation is a decrease of <br /> approximately 163 feet since the April 13, 2005 monitoring event As previously reported <br /> by GTT, the CMTrm wells were so tightly coiled from shipping that it was difficult to install <br /> the wells without the tubing corkscrewing in the borehole, even when the casing was <br /> stretched out on the ground in the spin to warm and relax the coils The result of this twist in <br />