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(2 to 50 mg/kg),ethylbenzene(2 to 15 mg/kg),xylene(5 to 220 mg/kg),TPH-gas(10 to 2, 100 mg/kg) (3) <br /> The mechanism for spread ofthe petroleum hydrocarbons in groundwater is vertical movement of petroleum <br /> hydrocarbon compounds vertically downward through the soil column to the groundwater and then through <br /> the groundwater surface by diffusion (4)Petroleum hydrocarbon contaminated groundwater plume extends <br /> over an area of approximately 62,500 square feet at a depth of about 48 feet bgs A minor amount of free- <br /> product may still exist at the site between MW-1 and MW-3 under the former UST pits Vertical rise and <br /> fail of the groundwater surface has spread the movement of petroleum hydrocarbon compounds vertically <br /> through the soil/groundwater contact where highest concentrations appear to be located The groundwater <br /> plume appears to have the following maximum petroleum hydrocarbon concentrations present in it benzene <br /> (290 µg/1), toluene (1300 µg/l ethylbenzene (400 µg/1), xylene (1800 µg/1), TPH-gas (11,000 µg/1) <br /> Oxygenate compounds present in the groundwater include MTBE(8 3 µg/1) Lead scavengers present in the <br /> groundwater plume include 1,2-DCA(10 µg/1)and 1,2-EDB (1 2 gg/1) <br /> Recommendations for further work include (1) installation of at least an additional four groundwater <br /> monitoring wells along the southern portion of Murray Street and on the east side of Cherokee Lane, (2) <br /> continue quarterly groundwater monitoring of the monitoring well network, (3) complete the sensitive <br />. receptor survey described to the workplan, (4) complete and update the Site Conceptual Model and <br /> associated Preliminary Problem Assessment Report after an additional two quarters of groundwater <br /> monitoring have been completed, (5)begin background work for a remediation feasibility study <br /> Mam1D\EnvuonmenW\Pan=Texaco\Reports\SAR1203 wpd Page 3 <br />