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Ge0[0giCa[Te_CfMWS Inf6Q _ID qj 1 , u <br /> 2741 River Road <br /> Modesto,Cal forma 95351 <br /> (209)538-6424ITax#538-5852 <br /> 1 <br /> ' REPORT <br /> Groundwater Monitoring <br /> ' 2nd Quarter 2001 <br /> ' Valentine (Castle Motors) <br /> 2315 N. El Dorado St. <br /> Stockton, CA <br /> Project No 723 2 <br /> August 20, 2001 <br /> EXECUTIVE SUMMARY <br /> ' This report summarizes the 2"d Quarter 2001 round of groundwater monitoring and testing <br /> that took place on June 25, 2001 The laboratory results indicate that detectable <br /> concentrations of the aromatic hydrocarbon compounds (BTEX) and gasoline range <br /> ' petroleum hydrocarbons (TPH-G) are present in all seven monitoring wells on site <br /> The groundwater elevations decreased approximately 1 17 feet since the March 6, 2001 <br /> ' monitoring event Groundwater gradient calculations show that groundwater flow is N82°E <br /> at 0 0046 ft/ft This is consistent with the site's historical directions that have been <br /> predominantly to the northeast <br /> 1.0 GROUNDWATER MONITORING <br /> ' 1..1 H dro eolo of Site <br /> Y g gY <br /> A site-specific groundwater gradient and bearing was calculated from the depth to water <br /> measurements taken during the groundwater monitoring The gradient was 0 0046 ft/ft <br /> flowing N82°E The groundwater gradient was calculated by resolving a three-point <br /> problem using wells MW-4, MW-5 and MW-6 These wells were selected because they are <br /> constructed relatively similar in regards to depth of screen interval The average elevation <br /> 1 <br />