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1 <br /> Ceotogical Technics Inc <br /> I 101 7`h Street <br /> Modesto California 95354 <br /> ' (209)522-4119/Fax(209)522-4227 <br /> REPORT <br /> ' Groundwater Monitoring <br /> 1" Quarter 2006 <br /> ' Valentine (Castle Motors) <br /> 2315 N. El Dorado St. <br /> Stockton, CA <br /> Project No 723 2 <br /> ' April 24, 2006 <br /> M <br /> EXECUTIVE SUMMARY <br />' This report summarizes the 1" Quarter 2006 groundwater monitoring event that took place on <br /> January 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 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-8/108/208, contains a high level of TPH-G contamination <br /> in the shallow well, but moderate levels in the intermediate and deep wells <br />' The groundwater elevation averaged -22 82 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 feet since the November 19, 2005 monitoring event <br /> . Groundwater gradient calculations indicate that shallow groundwater flow is N49°E at 0 003 <br />' ft/ft This is consistent with the site's histoncal directions that have been predominantly to <br /> 1 <br />