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samples(B5-GW through B 12-GW)primarily from approximately 100 to 300 feet north/northeast <br /> of the dry cleaner suite. Groundwater samples included those collected from 280 and 125 feet east <br /> and southwest of the dry cleaner suite, respectively. Depth to groundwater was approximately 10 <br /> to 12 feet bgs. The groundwater samples were analyzed by an on-site mobile laboratory for PCE, <br /> TCE, cis-and trans-1,2-DCE, and vinyl chloride; no target VOCs were detected above the <br /> laboratory RLs. <br /> A groundwater and soil sample(from 8 feet bgs)were collected from boring B 12-GW from within <br /> the northeast portion of the Site and three 8-foot deep soil gas samples (SG-5 through SG-7)were <br /> also collected from this area. These groundwater and soil gas samples were analyzed for benzene, <br /> toluene, ethylbenzene, and total xylenes (BTEX) in accordance with EPA Method 8260 by the <br /> mobile laboratory and no BTEX was detected in the groundwater samples. Low concentrations of <br /> ethylbenzene and total xylenes were detected in one soil gas sample. The soil sample was analyzed <br /> in accordance with EPA Method 8260 at a fixed laboratory and did not contain detectable <br /> concentrations of BTEX. <br /> The May 21,2015 sample analytical results are summarized in Tables 4 and 5 and sample locations <br /> are shown on Figure 4. The analytical results of the groundwater and soil gas samples were <br /> informally provided to the DTSC via a May 26, 2015 email. <br /> Partner prepared a May 11, 2015 letter titled Regulatory Agency Records Review and intended as <br /> an Addendum to Partner's December 9,2014 Phase I ESA report.The May 11,2015 letter included <br /> San Joaquin County Environmental Health Department (EHD) documents noted in the Phase I <br /> report but not obtained as part of the Phase I ESA. The May 11, 2015 letter also cited a June 10, <br /> 1991 letter from SCS Engineers (SCS) and a response from the Central Valley Regional Water <br /> Quality Control Board(CVRWQCB)obtained from GeoTracker. Based on Partner's review of the <br /> information in the EHD files, it appears the subject petroleum hydrocarbon release may have <br /> occurred on the Site at some point south and west of the intersection of North Tracy Boulevard <br /> and Clover Road. In a related matter, during the May 29, 2015 telephone conference call, the <br /> DTSC indicated their expectation that the subject petroleum hydrocarbon release be addressed as <br /> part of the pending Site characterization. <br /> A copy of the cited EHD Emergency Response Report (ERR), field notes, analytical laboratory <br /> reports, and photographs and GeoTracker documents are presented in Appendix E. Based on <br /> review of the two sets of documents, Partner provides the following: <br /> An ERR dated April 26, 1991 indicated that a complaint was received by on-site EHD staff that <br /> contaminated soils were being excavated without a permit and being transported offsite by an <br /> unlicensed hauler. Strong hydrocarbon odors were noted by EHD field inspectors and the <br /> excavation was voluntarily suspended. <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 6 <br />