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1� <br /> Environmental <br /> Mr Harlin Knoll Resources <br /> 4 November 1998 Management <br /> Page z <br /> monitoring wells usually required to define the ground water flow <br /> direction, the County recommended that the ground water flow <br /> information generated at the BJJ Trucking site be used to defile the <br /> ground water flow direction at the site The BJJ Trucking site is also <br /> located at 757 1111, Street By referencing the BJJ Trucking site ground <br /> water flow information, only one monitoring well was needed <br /> downgradient of each former UST location <br /> On behalf of Heinz, ERM agreed to conduct sampling in MW-1 and <br /> MW-2 for total petroleum hydrocarbons as gasoline (TPH-g), benzene, <br /> toluene, ethyl benzene, and xylenes (BTEX) compounds, and methyl <br /> tertiary butyl ether (MTBE) No TPH as diesel was detected during the <br /> tank removal and subsequent investigation activities, therefore, no <br /> sampling for TPH-d was necessary These two wells were sampled to <br /> document that the concentrations of TPH-g, BTEX, and MTBE were <br /> remaining stable or decreasing As stated in the 22 May 1998 letter, if the <br /> sampling results indicate that the concentrations of TPH-g, BTEX,and <br /> MTBE were static or decreasing, the plume would be considered stable <br /> Based on this low risk, Heinz would then submit a request for site <br /> closure to the County <br /> As anticipated, the results of the ground water samples collected in these <br /> two wells from May through September 1998 indicated that the <br /> concentrations of TPH-g, BTEX, and MTBE were decreasing or <br /> non-detectable Based on these sampling results, ERM, on behalf of <br /> Heinz, submitted a request for site closure to the County on 21 <br /> September 1998 <br /> After reviewing the results, the County requested that further <br /> investigation activities be conducted at the site In a letter dated 19 <br /> October 1998, the County requested that two additional monitoring wells <br /> be placed in the area of each former UST The County requested that one <br /> well be installed upgradient of each former UST location and one well be <br /> installed downgradient of each former UST location The downgradient <br /> wells are to be installed within 10 feet of each former UST excavation <br /> The County requested the installation of these wells to confirm the <br /> ground water gradient, document the size of the ground water plume, <br /> and determine the contaminant concentrations within the plume <br /> In a subsequent phone conversation on 29 October 1998 between ERM <br /> and Mr Harlin Knoll of the County, Mr Knoll recommended that soil <br /> samples be collected from the bottom of the monitoring wells to be <br /> installed downgradient of each former UST location These soil samples <br />