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ENTAL HEALTH <br /> r <br /> February 23, 1994 <br /> 92-117710234 <br /> Norcal Waste Systems, Inc <br /> Five Thomas Mellon Circle <br /> San Francisco, CA 94134 <br /> Attention- Mr. Larry Sweetser, Director of Regulatory Affairs <br /> Subject GROUNDWATER MONITORING <br /> RESULTS - November 1993 and J 1994 <br /> Stockto venger tion <br /> Stoc ornia <br /> Dear Mr. Sweetser <br /> Introduction <br /> This report, prepared Gr p, Inc (MARK) summarizes the results <br /> of the November 1993 and Jan 19 oundwater sampling events conducted at the <br /> Stockton Scaveation F ty located at 1240 Navy Drive, Stockton, CA (see <br /> Drawmg 1-1) Incl d ' this report are the laboratory data reports, tabular summary of <br /> the groundwater analytical results, Meld purging sheets, and a groundwater elevation <br /> contour drawing <br /> In the Fall of 1993, installation and implementation of the nn-situ vapor extraction <br /> system, as well as the installation of the groundwater extraction system and subsequent <br /> performance testing were conducted No monitoring of existing wells were performed <br /> during this time, however, in November of 1993, a new downgradient well (MW-4) was <br /> installed, developed and sampled, the results of which are incorporated herein. <br />