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r <br /> Ce01091ca l rechnics lac. <br /> 1101 7"'sileal <br /> modeslo,01111nuii11 9515.1 <br />' (209) 522 -I 1 10/1 nx(2111) 522-4227 <br /> REPORT <br />' Groundwater Monitoring <br /> V Quarter 2003 <br /> J.M. Equipment Company <br /> 1215 West Charter Way <br /> Stockton, California <br /> Project No 507 2 <br /> ' November 13, 2003 <br /> EXECUTIVE SUMMARY <br /> 'I Ills lepolt yun111111lizes Elle results of the 3`d Quarter 2003 groundwater monitoring and <br /> sainpling event that took place on September 11, 2003 For this event, the average <br /> gtoundwatel elevation tit the site was —11 99 feet mean sea level (msl) and the groundwater <br /> flow was N49`Is lit 0,003 1t/Et A vertical groundwater gradient calculation for wells MW-9 <br /> & 109 show thilt gtoull(IMIM r, flowing downward at a slope of 0 004 ft/ft <br /> The tinalyllUll tesulls of groundwater samples show that detectable concentrations of <br /> gasoline i tinge hydl octii bons were present in six of the site's eleven groundwater <br /> monitoring wells The I)liignitude of the contamination in the wells is consistent with <br /> histol ical site dotii, The Ciel oxygenate compound MTBE was detected in six of the wells <br /> The Oxidation-Rctluctiull Potential measurements show that all eleven of the monitoring - - - <br /> wells are wllhin the halo of reaction depleted water caused by biodegradation of the <br /> contaimmitiol) I)I11111e, <br /> ' A work plain loi "lit Situ l olnethatton Feasibility Study" dated September 20, 2002 and an <br /> addendum to (lie plan wet c 5ubmrtted to San Joaquin County Environmental Health <br /> Department (S,IC EIID) SIC EHD appioved the study in their March 20, 2003 letter and <br /> requested a detailed wol k plan foi evaluation GTI submitted our June 10, 2003 "In-Situ <br /> Remediation Pilot Test" wol k Flan for an in-situ remediation pilot project and SJC EHD <br />