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9110 Thornton Road Chronology <br /> Page 3 <br /> F Remediation Summary <br /> Groundwater extraction occurred between May 1986 and August 1990 utilizing <br /> MW 1 , MW4, MW12, PW1 , PW2, and RW 1 . Approximately 1 .6 million gallons of <br /> contaminated groundwater were extracted with the recovery of 760 gallons of free <br /> petroleum hydrocarbon product. <br /> The soil vapor extraction system operated between January 1990 and January <br /> 1991 , initially permitted by a 90 day;, emergency variance through the local air <br /> pollution control district. The soil vapor extraction system utilized 'MW1 , MW3, <br /> { MW4, RW1 , VP1, VP2, VP3, and VP4. . Four regenerative blowers were used <br /> simultaneously yielding between 80 - 160 standard cubic feet per minute. The <br /> combined effluent, constituting approximately 209 million cubic feet of air/vapor <br /> was treated using three 2,000 pound carbon reactors in series. Approximately <br /> 3,800 pounds of gasoline was extracted and treated using activated carbon <br /> i adsorption. An estimated 576 gallons of petroleum hydrocarbon product was <br /> recovered. <br /> k Natural attenuation processes were in effect and constituted the sole remediation <br /> method between January 1'991 and 1996. <br /> Tank Removal Sampling Results <br /> Sample/Depth TPH-gas -Benzene ' Toluene Ethylbenzene Xylene <br /> TIE / 11.42' <1.0 <.003 <.003 <:003 <.003 <br /> T 1 W / 13.42' <1.0 <.003 <.003 <.003 <.003 <br /> T2E / 13.42' <1.0 <.003 <.003 <.003 <.003 <br /> T2W / 73.0' <1.0 <.003 <.003 <.003 <.003 <br /> T3E / 13.0' <1.0 <.003 <.003 <.003 <.003 <br /> T3W / 13.01' <1.0 <.003 <.003 <.003 <.003 <br /> Trench / 3' <1.0 <.063 <.003 .004 .019 <br /> Trench2 / 2.5' 2,100 <.150 47.0 43.0 250.0 <br /> Tank samples collected on September 16, 11991 <br /> Piping samples/trench collected on September.17, 1991 <br />