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Geological ?�ec%ics l�rc. <br /> ' 1101 7'h Street <br /> Modesto,California 95354 <br /> ' (209)522-4119/]Fax(209)522-4227 <br /> REPORT <br />' Groundwater Monitoring <br /> 2°d Quarter 2004 <br />' Valentine (Castle Motors) <br /> 2315 N. El Dorado St. <br />' Stockton, CA <br /> Project No 723 2 <br />' August 31, 2004 <br /> EXECUTIVE SUMMARY <br />' This report summarizes the 2"a Quarter 2004 round of groundwater monitoring and testing <br /> that took place on May 6, 2004 <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 of BTEX and TPH-G for the event On site <br /> deep well MW-201 did not contain contamination above the laboratory reporting limits <br /> Much supports a conclusion that the initial contamination detected in the well was a drilling <br /> tartifact <br /> All three intervals of cross gradient well set MW-7/107/207 did not contain contaminant <br />' concentrations above the laboratory reporting limits All three intervals of the down gradient <br /> well set MW-8/1081208 contained BTEX and TPH-G All three intervals of the up gradient <br /> well set MW-91109/209 did not contain contaminant concentrations above the laboratory <br />' reporting limits <br /> Tne groundwater elevation averaged —23 72 feet mean sea level in the wells and this <br /> corresponds to about 34 feet below grade surface (bgs) This elevation is a decrease of <br /> approximately 0 06 feet since the March 2004 monitoring event Groundwater gradient <br />