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1 <br /> and put in service sometime between July 7 and 11, 2004 for the domestic water supply to the Ranch <br /> Market Well DW-I has been disconnected and is inactive In accordance with a letter from San <br /> Joaquin County Environmental Health Department (SJCEHD) dated February 26, 2004, sampling of <br /> well DW-1 has ceased <br /> 25 Free Product <br /> 1 Free product was observed in groundwater monitoring well MW-3 during the First Quarter 2004 <br /> sampling event in January 2004 Upon discovery of the free product, Geocon began frequent <br /> monitoring of the product level and bailing to remove it Measured product thickness ranged from an <br /> initial maximum of 0 5 foot on January 9, 2004 to 0 012 foot on February 9, 2004 <br />' On January 30, 2004, Geocon purged well MW-3 in an attempt to create a cone of depression and <br /> draw additional product into the well No increase in free product thickness was noted from the <br /> pumping effort As of February 9, 2004 approximately one-half gallon of product had been removed <br /> from MW-3 The product odor, color, and apparent viscosity are consistent with weathered gasoline <br /> Based on the presence of free product in well MW-3, SJCEHD requested a written summary of the <br /> findings and proposed actions Geocon prepared a letter regarding Free Product Discovery and <br /> Proposed Actions, dated February 18, 2004 Geocon proposed to continue monitoring and to remove <br /> free product <br /> ST were removed from the Site in 1991 and the Site has not operated as a fueling facile since <br /> U s e p g ty <br /> the time of removal In more than five years of groundwater monitoring and approximately 1 5 years <br /> of remedial activity at the Site (1998-2004), free product had not been encountered until the First <br /> Quarter 2004 The discovery of free product after a significant period of time of source removal and <br /> Iremedial activity could be indicative of an additional UST at the Site Accordingly, Geocon proposed <br /> to perform a records review at SJCEHD and perform a geophysical investigation at the Site to <br />' evaluate the existence of additional UST(s) In a letter dated February 26, 2004, SJCEHD concurred <br /> with Geocon's recommendations <br />' In accordance with Geocon's Free Product Discovery and Proposed Actions workplan, a <br /> geophysical investigation was performed at the site by Spectrum Geophysics on May 3, 2004 <br /> Spectrum did not discover strong evidence of buried USTs at the site <br /> 1 <br /> Project No 58643-06-01 -4- rebruary 14,2005 <br />