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The lateral extent of the gravel proximate to the dry cleaners suite is not known. No obvious fine <br /> grained units or other evidence of heterogeneity other than the gravel were encountered. <br /> Local and Regional H, dr�olog.Y <br /> During January and May 2015, groundwater was encountered at approximately 10 to 12 feet bgs. <br /> No data regarding site-specific groundwater flow direction is currently available; regionally, the <br /> groundwater flow direction is predominantly to the north-northeast. Based on field observations, <br /> confining units were not encountered and the water table appeared to be unconfined. <br /> The closest surface water body is an unnamed canal located approximately 5000 feet to the east of <br /> the Site; the canal flows to the north and discharges to Sugar Cut slough approximately 6000 feet <br /> northeast of the Site. <br /> Preferential Pathways <br /> To date and based on limited characterization,no preferential pathways for soil gas or groundwater <br /> such as fractures, sand lenses, or utility corridors have been identified. <br /> Groundwater Quality <br /> Potable water used at the Site is from a monitored municipal source provided by the City of Tracy. <br /> To date,three grab groundwater samples from beneath and adjacent to the south of the dry cleaner <br /> suite contained PCE at a maximum concentration of 30 µg/L. Seven additional grab groundwater <br /> samples from the southwest, east, north, and northeast of the dry cleaners suite did not contain <br /> detectable concentrations of VOCs. <br /> To date, no groundwater monitoring wells have been installed and the lateral and vertical extent <br /> of the existing plume is unknown. <br /> Well Records and Boring Logs <br /> Copies of the two May 3, 1991 DWR Water Well Drillers Reports associated with the documented <br /> destruction of two water wells that were within the southeastern portion of the Site and the soil <br /> boring logs from shallow borings advanced in January 2015 are included in Appendix E. <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 15 <br />