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CT Technics Inc. <br />' 1101 7`°Street <br /> Modesto,California 95354 <br />' (209)522-4119/Fax(209)522-4227 <br /> REPORT <br />' Groundwater Monitoring <br /> 2"a Quarter 2005 <br />' Valentine (Castle Motors) <br /> 2315 N. El Dorado St. <br />' Stockton, CA <br /> Project No 723 2 <br /> June 20, 2005 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the 2°d Quarter 2005 groundwater monitoring event that took place <br /> on April 13, 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 contained low levels TPH-G for the event Deep well MW-201 <br /> did not contain contamination for the event <br /> ' The presence of TPH-G in cross gradient well set MW-207 probably represents the lateral <br /> spreading edge of the advancing plume This well did not contain contaminant <br /> concentrations above the laboratory reporting limits for the first three quarterly monitoring <br /> ' events in 2004 The up gradient well set MW-9/109/209 did not contain contaminant <br /> concentrations above the laboratory reporting limits These wells define the up gradient edge <br /> ' of the plume The down gradient well set, MW-8/108/208, shows substantial levels of TPH- <br /> G contamination in the shallow and intermediate wells and a significantly lower level in the <br /> deep well <br /> ' The groundwater elevation averaged -23 45 feet mean sea level in the shallow wells and this <br /> corresponds to about 33 feet below grade surface (bgs) This elevation is an increase of <br /> approximately 2 01 feet since the January 27, 2005 monitoring event As previously reported <br />