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C 0109 cat Teckiics Inc <br /> 1 10 1 7'h street <br /> Modesto,California 95354 <br /> (209)5224119/Fax(209)522-4227 <br /> 1 <br /> REPORT <br /> Groundwater Monitoring <br /> 1" Quarter 2004 <br /> Marci Property <br /> 2969 Loomis Road <br /> ' Stockton, CA <br /> Project No 770 2 <br /> ' June 15, 2004 <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 22 and <br /> February 26, 2004, and the 15' Quarter 2004 monitoring event completed on March 15, it, <br /> ' 2004 <br /> The analytical results from groundwater samples indicate that diesel range petroleum <br /> ' hydrocarbons (TPH-D) are present in three 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 /> Depth to groundwater was measured three times during the first quarter of 2004 On <br /> ' January 22, 2004 gradient calculations show that groundwater flow in the water table wells <br /> was S54°E with a slope of 0 002 ft/ft The deeper aquifer groundwater flow was N88°E with <br /> a slope of 0 0012 ft/ft On February 26, 2004, the shallow aquifer flow was S55°E with a <br /> ' slope of 0 002 ft/ft and the deeper flow was N86°E with a slope of 0 0015 ft/ft On March <br /> 15, 2004, the shallow aquifer flow was S37°E with a slope of 0 002 ft/ft and the deeper flow <br /> was S89°E with a slope of 0 0018 ft/ft <br /> Based on a previous consultant's data this site has a history of variable groundwater flow <br /> direction The deeper aquifer experienced an 180°reversal of groundwater direction for the <br />