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APPENDIX A: PREVIOUS ENVIRONMENTAL ACTIVITIES (US CAN-WELTY ROAD) US Can—Welty Road(the Site) emerged after several environmental investigations unrelated to the Historic Pipeline Portfolio—Bakersfield to Richmond(HPP-BTR)were performed in 1995 and 1996 at the Hunter Container Corporation (Hunter Container) property located at 35275 Welty Road in Vernalis, California. In the process of investigating a former burn pit and a release from a condensate outlet,petroleum hydrocarbons were encountered in soil and groundwater on the Hunter Container property in the vicinity of the former HPP-BTR pipelines. As a result, in 1997 Chevron Pipeline Company(CPL) initiated investigation of the former HPP-BTR pipelines in the area near the Hunter Container property. This HPP-BTR investigation area is known as the US Can—Welty Road site, which is the subject of the previous environmental activities. Activities leading to the discovery of HPP-BTR-related affected soil and groundwater, and subsequent investigations, are described below in chronological order. Information on other properties in proximity to the Site is also included. ENVIRONMENTAL RESOURCES MANAGEMENT—WEST, INC. (ERM—WEST) 1995 SITE INVESTIGATIONS"' On March 30, 1995, ERM-West performed soil sampling at the Hunter Container facility to evaluate areas of potential environmental concern. ERM-West collected a sample from the water-supply well on site and soil samples from 11 locations (S-1 through S-11) near the wash-water discharge area, gasoline storage-tank removal area, chemical storage shed, condensate-line outlet, septic tank, compressor building, and outdoor equipment- storage area (i.e.,west of the can fabrication plant waste/bum pit area). The samples were collected from depths ranging from ground surface to 3 feet below ground surface (bgs). Total petroleum hydrocarbons (TPH) quantified as oil and grease (TPHog)were detected in four soil samples (S-4, S-5, S-6, and S-8) at concentrations ranging from 1,500 milligrams per kilogram (mg/kg)to 5,200 mg/kg. TPH quantified as gasoline (TPHg)was detected in two of the soil samples (S-4 and S-5) at concentrations of 20 and 6,000 mg/kg, respectively. None of the target chemicals were detected in the sample (W-1) collected from the water-supply well. The report documenting these activities also stated that a 1,000-gallon gasoline underground storage tank(UST)was removed from the Hunter Container site in 1988; no further details about the tank removal were provided. On May 9, 1995, ERM-West advanced four hand-auger borings (HB-3, HB-4, HB-5, and HB-6)to 10 feet bgs to establish the lateral and vertical extent of affected soil near the northeastern side of the former can fabrication plant. Affected soil was identified in HB-3, HB-4, and HB-6. Benzene,toluene, ethylbenzene, and total xylenes (BTEX), and trichloroethylene(TCE) were the main compounds detected in the soil samples. 1. ERM-West, 1995. Hunter Container Corporation Soil Sampling,35275 Welty Road, Vernalis, California. April 18. 2. ERM-West, 1995. Letter to Mr.Al Gans reg:Lab Analysis Data Sheets and Site Location Map of Soil Sampling Activities at the Hunter Container Corporation facility in Vernalis,California. June 12.