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Geological Technics Inc. <br /> l 101 7"'Street <br /> Modesto,Califomia 95354 <br /> q.- - <br /> (209).522-4119/Fax(209)5224227 - <br /> � I <br /> REPORT <br /> Groundwater Monitoring <br /> 3"d Quarter 2003 <br /> George's Service <br /> f 1600 Durham Ferry Road <br /> fTracy, California <br /> F <br /> Project No. 425.2 <br /> November 17, 2003 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the YdQuarter 2003 groundwater monitoring and testing event that <br /> was completed on September 5, 2003. The water table gradient for this monitoring event <br /> was 0.0013 ft/ft flowing NOT. Depth to groundwater,.in the water table wells, at the site <br /> r ranged between 11.48 and 13.25 feet below ground surface (bgs) for the event. The <br /> f L groundwater gradient in the site's intermediate wells was 0.0018 ft/ft flowing N36°E. These <br /> data are consistent with past events. The vertical component of groundwater flow has been <br /> consistently in the,upward direction and may be the primary reason the deeper aquifer has <br /> 1 not been impacted by these petroleum compounds. <br /> The analytical results from the September 2003, monitoring event show that aromatic <br /> hydrocarbon compounds (BTEX) and gasoline range petroleum hydrocarbons (TPH-G) are <br /> present in 4 of the 9 monitoring wells sampled during this event (MW-1, MW-2, MW-4 and <br /> MW-5). Three domestic water wells in the immediate area of the fonner tanks were tested <br /> and none of the wells contained contaminant concentrations above the laboratory detection <br />` limits. <br /> A summary of groundwater analytical findings includes: <br /> • TPH-G concentrations exhibited a stable trend in well MW-1 and MW-4. <br /> - • TPH-G concentrations in MW-2 and MW-5 are elevated and MW-5 exhibits a <br /> distinct trend of increasing concentrations over that last few years. <br />