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. Simco 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 (DIPS), 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-dicbloroethane (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, DIPS, ETBE, MTBE, TAME, TBA, and <br /> 1,2-DCA Please note that samples receiving silica gel cleanup must be reported with <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 <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 <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 MWA Please include the analysis of motor oil in future groundwater <br /> sampling for MW-1 <br />