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No Further Action Required Request Report US Can—Welty Road September 24,2013 Well Drillers reports, four of the identified wells are used for domestic purposes, one well is used for irrigation,one well is used for industrial purposes, and two wells were identified as public- supply wells. The results of the search are provided in Table 2. One of the identified domestic wells appears to correspond to well W-1 (Figure 2; Table 2,well ID#3),which was sampled by Environmental Resources Management-West, Inc. (ERM-West) on March 30, 1995. The well had non-detect results for all of the analyzed constituents, including TPHg, oil and grease,toluene, ethylbenzene, and total xylenes(ERM-West, 1995; Appendix B.1). With the exception of the industrial well, all of the other identified wells have screened intervals starting at 120 feet bgs or greater; the areas of affected groundwater appear confined to the upper water-bearing zones at less than 80 feet bgs. Typically, the crude oil in affected soil is not easily soluble, has a high viscosity, and moves very slowly if at all. Therefore, it is unlikely that any of the wells would become impacted by the shallow affected groundwater related to the Site. The total dissolved solids(TDS) concentrations in groundwater at the Site range from 779 milligrams per liter(mg/L) to 1,280 mg/L,which exceed numerous State of California and federal TDS standards for drinking water as well as agricultural-use criteria. Installation of shallow water-supply wells is unlikely within or in the immediate vicinity of the affected groundwater given its poor quality and likely low yield. Use of the affected groundwater is not anticipated at the Site; consequently, institutional controls are not needed with respect to installation of water-supply wells. 3.2 NO FURTHER ACTION REQUIRED DOCUMENTATION A narrative summary response follows to address each numbered item in section 6.6 of the Tri-Regional Recommendations. 1. Site history and current site conditions. The Site is located in Vernalis, San Joaquin County, California in a rural area surrounded by agricultural, light-industrial, and residential properties. The Site boundary is defined by the area of investigation related to former HPP-BTR activities, including the former Hunter Container property at 35275 South Welty Road, the adjacent UPRR ROW, and adjacent parcels to the northeast and southeast. The Site generally parallels both the UPRR ROW and Highway 33 ROW, extending from approximately 500 feet southeast of East Schaefer Road to approximately 500 feet southeast of the intersection of Highway 33 and South Welty Road. At its widest point, the Site extends approximately 125 feet northeast and 250 feet southwest of Highway 33. A site map is included on Figure 2. The former Hunter Container property currently consists of a large warehouse building,paved asphalt surfaces and parking areas, a 100,000-gallon aboveground water storage tank and pump house, and an unpaved area with a percolation pond. The property was formerly occupied by Hunter Container,a container manufacturer; US Can Company(US Can), a can manufacturer; and Insulair, Inc. (Insulair), a paper-products manufacturer. The property has been vacant since April 2009. Hunter Container still owns the property. The Site includes two inactive petroleum pipeline systems: the former OVP and TAOC pipelines,which are collectively referred to as the HPP-BTR. The pipelines ran parallel to Highway 33 on the south side of the UPRR ROW. 5 SAIE