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• . <br /> Environmental <br /> Resources <br /> Management <br /> 1777 Botelho Dnve <br /> Suite 260 <br /> Walnut Creek,CA 94596 <br /> (925)946-0455 <br /> (925)946-9968(Fax) <br /> 21 September 1999 <br /> Harlin Knoll <br /> Public Health Services <br /> San Joaquin County * � , <br /> 304 E Weber Avenue, Third Floor ER1�/b <br /> Stockton, CA 95201-0388 <br /> Subject: Ground Water Sampling Results <br /> Former Heinz Facility `s <br /> Tracy, California - <br /> Dear Mr Knoll <br />. This letter presents the results of ground water sampling performed on <br /> 2 September 1999 at the former Heinz facility (site) m Tracy,California <br /> ° Ground water samples were collected from six monitoring wells at the <br /> site during this sampling event This sampling event is the second event <br /> a performed to evaluate chemical concentrations in ground water at two <br /> x <br /> former underground storage tank (UST) release sites following the <br /> R injection(week of 7 June 1999) of oxygen releasing compound (ORC) <br /> A y f <br /> -' The ground water samples were analyzed for total petroleum <br /> hydrocarbons as gasoline (TPH-g) (EPA Method 8015), benzene, toluene, <br /> Yz ethylbenzene, and xylenes (BTEX) (EPA Method 8020), and methyl <br /> tertiary butyl ether (MTBE) (EPA Method 8020) The ground water <br /> sampling analytical results are summarized in Tables 1 and 2 <br /> (Attachment A) Copies of the laboratory analytical results and well <br /> sampling data are included as Attachments B and C, respectively <br /> 9 it kl[r^! z q <br /> lie{: 4^ire is^i US�['�1 <br />......gi=;�y�, Ground water sampling results for wells surrounding former UST 1 are <br /> presented in Table 1 Although the concentrations of-PH-g and BTEX <br /> iw compounds detected in downgradient well MW-1 have remained <br /> relatively stable since ORC injection (June and September 1999), this <br /> sampling event has shown an increase since the last sampling and are <br /> t[ K K4 P <br /> similar to the concentrations detected prior to ORC injection(April 1999) <br /> In general, historical sampling of this well has produced unstable results <br /> but indicates an overall decreasing trend <br /> s t ss xat aF ,� e <br /> Ns�^N1 <br />