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r Cealogical Technics Inc. <br /> t1101 7`h street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> 1 <br /> ' REPORT <br /> Groundwater Monitoring <br /> 2nd Quarter 2006 <br /> ' Valentine (Castle Motors) <br /> 2315 N. El Dorado St. <br /> Stockton, CA <br /> Project No 723 2 <br /> ' June 21, 2006 <br /> EXECUTIVE SUMMARY <br /> ' This report summarizes the 2nd Quarter 2006 groundwater monitoring event that took place <br /> on April 17, 2006 <br /> ' The laboratory results indicate that elevated 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 did not <br /> ' contain contamination for the event Deep well MW-201 intermittently contains <br /> contaminants and it continues to contain trace BTEX <br /> ' The presence of contaminants in cross gradient well set MW-7/107/207 probably represents <br /> the lateral spreading edge of the advancing plume The presence of TPH-G in up gradient <br /> well set MW-9/1091209 well set probably represents dispersion above the fluctuating water <br /> ' table with possible water infiltration causing additional dispersion The down gradient well <br /> set, MW-8/108/208, contains elevated levels of TPH-G contamination in all three aquifer <br /> ' horizons with the highest levels in the deeper MW-208 well <br /> The groundwater elevation averaged -19 98 feet mean sea level in the shallow wells and this <br /> ' corresponds to about 30 feet below grade surface (bgs) This elevation is an increase of <br /> approximately 2 84 feet since the January 17, 2006 monitoring event It is noted that the <br /> groundwater levels exceeded the screened interval of all of the site's wells for the second <br />