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Treadvvell&Rollo <br /> • <br /> 1.3 Interim Remedial Measures <br /> 1.3.1 Operable Unit 1 <br /> No interim remedial measures (IRMs) specific to the soil contamination at OU 1 have been <br /> performed at Areas 10, 11, or 20. All structures at each area have been demolished and <br /> removed. <br /> 1.3.2 Operable Unit 2 <br /> Interim remedial measures are currently in progress at areas 15, 16, and 21, under the direction <br /> of the SJCEHD. The IRMs specifically address the soil and groundwater contamination caused <br /> by USTs that previously existed at each site. <br /> Area 15 <br /> • A significant amount of soil and groundwater investigation work has been performed at Area 15, <br /> under the oversight of the SJCEHD. Underground storage tanks (USTs) which reportedly stored <br /> gasoline, diesel, and trichloroethane (TCA)were formerly located in three areas of the site. The <br /> USTs were removed in 1986 (four tanks) and 1992 (three tanks), and petroleum hydrocarbon <br /> contamination has been documented (AGE 1997). <br /> Petroleum hydrocarbon contamination includes total petroleum hydrocarbons quantified as <br /> gasoline (TPHg)diesel (TPHd) and motor oil (TPHmo) and benzene, toluene, ethyl benzene and <br /> xylenes (BTEX) in soil and groundwater. Additionally, elevated concentrations of arsenic have <br /> been detected in soil at the site. <br /> Volatile organic compounds not associated with petroleum fuel hydrocarbons, including TCA, <br /> 1,2-dichloroethane (1,2-DCA),trichloroethene (TCE), and methyl ethyl ketone (MEK) have <br /> been detected in groundwater. Concentrations of these compounds have ranged from below <br /> laboratory reporting limits to 61 micrograms per liter (ug/1) (AGE 2000a). There are currently <br /> • 15 groundwater monitoring wells being sampled as part of an ongoing groundwater monitoring <br /> 3 <br /> 25970318.PGS 15 November 2000 <br />