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1 I <br /> Jimco Truck Plaza <br /> Page 2 of 3 <br /> 60 feet bgs, EHD recommends that the boring be continuously cored to characterize the <br /> soil lithology, and if field conditions warrant, soil samples be analyzed for contaminants <br /> of concern. <br /> Please analyze groundwater samples from soil boring, B-18, and newly-installed MW-10 <br /> for total petroleum hydrocarbons as gasoline (TPH-g), total petroleum hydrocarbons as <br /> diesel (TPH-d), total petroleum hydrocarbons as motor oil (TPH-mo), benzene, toluene,, <br /> ethyl benzene, and xylenes (BTEX); di-isopropyl ether (DIPE), ethyl tertiary-butyl ether' <br /> (ETBE), methyl tertiary-butyl ether (MTBE), tertiary-amyl methyl ether (TAME),!' <br /> tertiary butyl alcohol (TBA), methanol, ethanol, and 1,2-dichloroethane (1,2-DCA).', <br /> Report 1,2-DCA at 0.5 micrograms per liter (µg/L), if possible. Analyze selected soil' <br /> samples for TPH-g, TPH-d, TPH-mo, BTEX, DIPE, ETBE, MTBE, TAME, TBA, and:, <br /> 1,2-DCA. Please note that samples receiving silica gel cleanup must be reported with! r <br /> and without the silica gel cleanup. This includes groundwater samples collected during <br /> the quarterly groundwater monitoring events. <br /> EHD comments on Feasibility Testing Work Plan as follows: <br /> EHD approves the installation of one air sparge well (AS-1) to approximately 33 feet bgs"" ,11 <br /> with a screen interval anticipated to extend from 30 to 33 feet bgs. AS-1 will be located" <br /> approximately 10 feet from extraction well EW-1 and approximately 15 feet from <br /> monitoring well MW-1. <br /> EHD also approves the soil vapor extraction (SVE) and combined SVE and air sparge' <br /> (AS) pilot studies as proposed by Cambria. In addition to air samples collected and <br /> submitted to Air Toxics Ltd. for analyses of TPH-g and BTEX, please analyze air <br /> samples for MTBE and 1,2-DCA, also. <br /> Monitoring wells have recently been surveyed at this site. Please submit a copy of the 1 <br /> survey report listing locations and casing elevations to EHD in the next quarterly <br /> monitoring report. Also submit original field data sheets listing temperature, pH, <br /> conductivity, depth to water, total depth, etc. in the quarterly reports. The revised typed <br /> version may also be included in the quarterly reports. <br /> Based on data reported during the first quarter 2005 report, motor oil was detected in <br /> groundwater from MW-1. Please include the analysis of motor oil in future groundwater <br /> sampling for MW-1. <br /> I <br />