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1 <br /> Geofogica[Technics Inc. <br />' 2741 River Read <br /> Modesto,C IFaX 38-5 4 L� <br /> 5351 <br /> (209)538-6424/jai#538-5852 <br /> REPORT <br /> Groundwater Monitoring �� <br />' 4`n Quarter 1999 `^ ,�"` <br /> q,',A—,V- K <br />' Valentine (Castle Motors) <br /> 2315 N. El Dorado St. <br /> CA <br /> i <br /> Stockton, w , r <br /> Project No 723 2 <br /> January 19, 2000 � a <br /> EXECUTIVE SUMMARY <br /> This report summarizes the 4" Quarter 1999 round of groundwater monitoring and testing <br /> that took place on December 16, 1999 The test results show that � �C <br /> • Detectable concentrations of the aromatic hydrocarbon compounds (BTEX) and gasoline <br /> range petroleum hydrocarbons (TPH-G) are present in all seven monitoring wells on site <br /> • Concentrations continue to increase in MW-2, MW-3 and MW-5 <br /> 0 None of the oxygenated fuel compounds were detected, however detection limits were <br /> elevated due to interference from BTEX and TPH-G <br /> • The old domestic well located at 60 East Castle showed the presence of trace amounts of <br /> Toluene and Xylene and low levels of TPH-G <br /> The groundwater level dropped approximately 0 6 feet since the September 13, 1999 <br /> monitoring event Groundwater gradient calculations show that groundwater flow is N66°E <br /> at 0 0029 ft/ft <br /> i <br />