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' Mr Harlin Knoll Environmental <br /> 27 January 2000 Resources <br /> Page 2 Management <br />' measurements and collected samples from monitoring wells for analysis <br /> of total petroleum hydrocarbons as gasoline (TPH-g), benzene, toluene, <br />' ethylbenzene, and xylenes (BTEX) compounds, and methyl tertiary-butyl <br /> ether (MTBE) The results of these sampling events indicated that <br /> elevated concentrations of TPH-g and BTEX compounds were present in <br /> groundwater immediately downgradient of each former UST location <br /> Figures 1 and 2 (Attachment A) present the monitoring well locations in <br /> the vicinity of UST 1 and UST 2, respectively <br /> Based on this data, the Regional Water Quality Control Board (RWQCB) <br /> 1 indicated that the concentration of compounds in shallow groundwater <br /> at each UST location presented an unacceptable health risk at the site <br />' The County and RWQCB requested that Heinz evaluate potential <br /> remedial technologies for reducing the concentration of compounds <br /> (specifically benzene) in groundwater in the vicinity of the former tank <br />' locations <br /> Therefore, potential remediation technologies for cherrucals in <br /> groundwater at the site were evaluated ERM, on behalf of Heinz, <br /> submitted the Investigation Results Report (ERM, 13 April 1999) This <br />' report presented the results of sampling performed and an evaluation of <br /> several potential remedial technologies based on the analytical results <br /> This report concluded that oxygen-releasing compound (ORC) injection <br />' was the most suitable technology for remediating chemicals in <br /> groundwater at the site A Workplan for performing ORC injection was <br /> also included in this report <br /> ERM performed ORC injection in the vicine of UST 1 and UST 2 during <br /> l �Y g <br /> the week of 7 June 1999 The ORC injection activities are summarized in <br /> a letter to the County dated 14 July 1999 Following ORC injection, <br /> groundwater sampling was conducted at the site to evaluate chemical <br /> concentrations in groundwater Groundwater sampling events were <br /> i conducted on 30 June, 2 September, and 28 October 1999, prior to the <br /> current sampling event <br /> CURRENT GROUNDWATER SAMPLING RESULTS <br /> Groundwater samples were collected from six monitoring wells at the <br /> site during the current sampling event on 6 January 2000 The <br /> groundwater samples were analyzed for TPH-g (USEPA Method 8015) , <br /> and BTEX (USEPA Method 8020) The groundwater sampling analytical <br />