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Geological Techgics Ifta <br /> ' 1101 70 street <br /> Modesto,California 95354 <br /> (209)522-4119/Fax(209)522-4227 <br /> ' REPORT <br /> Groundwater Monitoring <br /> 4th Quarter 2005 <br /> Marci Property <br /> 2969 Loomis Road <br /> ' Stockton, CA <br /> Project No 770 2 <br /> March 16, 2006 <br /> EXECUTIVE SUMMARY <br /> The site's groundwater monitoring wells are sounded and sampled on a quarterly schedule <br /> This report summarizes the 4th Quarter 2005 monitoring event completed on December 9, <br /> 2005 <br /> ' The analytical results from groundwater samples indicate that diesel range petroleum <br /> hydrocarbons (TPH-D) are present in four of the site's eleven monitoring wells Well MW-5 <br /> continues to contain elevated concentrations of TPH-D and has experienced wide swings in <br /> diesel content over the last few events It is possible that these fluctuations are due to <br /> changes in groundwater elevation and/or poor recharge to the well with the resulting poor <br /> ' sample quality <br /> Depth to groundwater was measured in the sites eleven wells during the fourth quarter of <br /> ' 2005 On December 9, 2005, the shallow aquifer flow was S45°E with a slope of 0 001 ft/ft, <br /> and the deeper flow was East with a slope of 0 001 ft/ft The vertical groundwater gradients <br /> were variable for the event The gradients were positive (or upward) and negative (or <br /> ' downward) for the MW-5/105 and MW-61106 well pairs, respectively <br /> Based on a previous consultant's data this site has a history of variable groundwater flow <br /> ' direction The shallow groundwater generally flows to the south-southeast whereas the <br /> deeper aquifer generally flows to the east The gradient of the shallow aquifer has ranged <br /> from east-northeast to southwest The deeper aquifer experienced a 180' reversal of <br /> l <br />