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Impacted and Exposed Media <br /> Impacted and exposed media pertain to the VOCs related to the Quality Cleaners and the 1991 <br /> petroleum hydrocarbon release, residual TPH and associated PAHs, PCB, and metals related to <br /> the 1991 petroleum hydrocarbon release, and OCPs related to the former agricultural use of the <br /> Site. These media are discussed below. <br /> Quality Cleaners VOCs <br /> Four 10-foot deep soil samples collected from beneath and adjacent to the dry cleaning suite did <br /> not contain detectable concentrations of VOCs. <br /> Three 10-foot deep groundwater samples contained dissolved detectable PCE; a sample from <br /> beneath the dry cleaner contained 2.8 µg/L, and two samples proximate to the south of the dry <br /> cleaner suite contained 8.8 µg/L and 30 µg/L, respectively. <br /> Four sub-slab soil gas samples contained PCE at concentrations ranging from 1,200 µg/m3 to 3,300 <br /> µg/m3. One sub-slab soil gas sample contained 350 µg/m3 TCE, most likely as the result of the <br /> dechlorination of PCE. <br /> Because of the detection of somewhat elevated concentrations of PCE/TCE in sub-slab soil gas <br /> samples there is the potential that air within the dry cleaning suite, and, to a lesser extent, in the <br /> adjacent suites,may have discernable impacts due to vapor intrusion. There are no indications that <br /> other media such as drinking water, surface water or ecological receptors have been impacted or <br /> are currently threatened. <br /> Petroleum Hydrocarbons <br /> Based on information within the EHD records, TPH and BTEX impacted soil was present within <br /> the subject property. There is currently no data pertaining to petroleum hydrocarbon impacts to <br /> groundwater. <br /> Other COPC <br /> Currently, there are no data pertaining to other COPC, including PAHs,PCBs, LUFT Metals, and <br /> OCPs. <br /> Release Mechanism and Primary and Secondary Sources of COPC <br /> Release mechanisms and sources of COPC pertain to the VOCs and DP-2000 related to the Quality <br /> Cleaners; residual TPH, BTEX, PAHs, PCBs, LUFT Metals related to the 1991 petroleum <br /> hydrocarbon release; and OCPs related to former agricultural activities, and are discussed below. <br /> Sampling and Analysis Workplan <br /> Tracy Corners Shopping Center <br /> 3225 North Tracy Boulevard <br /> Tracy,California 95376 <br /> Partner Project Number SM14-129814 <br /> Docket Number HAS-VCA 14/15-108 <br /> August 15,2016 <br /> Page 17 <br />