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1 <br /> Ceologic, t Tec%iies ittC. <br /> 1 101 7"'Street <br /> Modesto, California 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> 1 <br />' REPORT <br /> Groundwater Monitoring <br /> V Quarter 2003 <br />' Marci Property <br /> 2969 Loomis Road <br />' Stockton, CA <br /> Project No 770 2 <br />' May 28, 2003 <br /> EXECUTIVE SUMMARY <br /> The site's eleven groundwater monitoring wells are sounded and sampled on a quarterly <br /> schedule This report summarizes groundwater sounding events on January 28 and <br /> February 6, 2003, and the I` Quarter 2003 monitoring event completed on March 19, 2003 <br />' The analytical results from groundwater samples indicate that diesel range petroleum <br /> hydrocarbons (TPH-D) are present in five of the site's eleven wells Well MW-5 continues <br />' to contain elevated concentrations of TPH-D although the concentrations continue to <br /> fluctuate since the start of the monitoring program <br />' Oxidation-Reduction Potential measurements show that seven of the site's eleven <br /> monitoring wells are within the reaction depleted water caused by biodegradation of the <br /> contamination plume <br /> Depth to groundwater was measured three times during the first quarter of 2003 On <br />' January 28, 2003 gradient calculations show that groundwater flow in the water table wells <br /> was S47°E with a slope of 0 001 ft/ft The deeper aquifer groundwater flow was N89°E with <br /> a slope of 0 0018 ft/ft On February 6, 2003, the shallow aquifer flow was S62°E with a <br /> ' slope of 0 001 ft/ft and the deeper flow was N66°E with a slope of 0 0013 ft/ft On March <br /> 19, 2003, the shallow aquifer flow was S66T with a slope of 0 001 ft/ft and the deeper flow <br /> was N81°E with a slope of 0 0034 ft/ft Based on a previous consultant's data this site has a <br />