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Geologica[Tecfin Wks Inc. <br /> ' 2741 7rver Road <br /> �Afodesto,Carforn a 95351 <br /> (209)538-b424/'FaX#538 5852 <br /> 1 <br /> ' REPORT r <br /> Groundwater Monitoring <br />' 2nd Quarter 2001 <br />' J.M. Equipment Company <br /> 1245 West Charter Way <br /> Stockton, California <br />' <br /> Project No 507 2 <br />' June 19, 2001 <br /> MEXECUTIVE SUMMARY <br />' This report summarizes the results of the 2" Quarter 2001 groundwater monitoring and <br /> testing event that tools place on June 1, 2001 For this event, the average depth to <br /> groundwater at the site was 14 39 ft bgs and the groundwater flow was N77°E at 0 002 ft/ft <br /> Vertical groundwater gradient calculations between MW-9 & 109 show that groundwater is <br /> flowing downward at approximately two tines hoiizontal gradient <br /> On May 24, 2001, two water table wells MW-7 and MW-10 were installed approximately <br /> 200 feet southwest and 150 feet northwest of, respectively, the former UST location (see <br />' Figure 2) to further define the lateral extent of the groundwater contamination plume To <br /> define the vertical extent of petroleum hydrocarbons, a discretely screened well MW-109 <br /> was installed in the location of the former UST The new wells were surveyed into existing <br /> site data by a licensed surveyor— data included in Appendix D <br /> The analytical results of groundwater samples from the existing and new wells show that <br /> detectable concentrations of BTEX and TPH-G were present in seven of eleven <br /> groundwater monitoring wells The magnitude of the contamination zn the wells is <br /> consistent with historical site data Fuel oxygenate compounds were detected in five of the <br /> wells <br /> f�l <br /> s� <br />