SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

No Further Action Required Request Report Tracy Byron Road-Tracy,California December 1,2011 corridor selected by the RWQCB. Concentrations of BTEX,TPH as diesel (TPHd),or PAHs were not detected at or above the laboratory detection limits for all the water-supply well samples submitted by SAIC. Groundwater sampling results are provided as Appendix C. Typically,the crude oil in affected soil is not easily soluble,has a high viscosity, and moves very ' slowly if at all. Affected groundwater at the Site appears limited to the shallow water-bearing zone(typically encountered between 10 and 25 feet bgs). Therefore, it is unlikely that any of the wells would become impacted by the shallow affected groundwater related to the Site. Installation of additional shallow water-supply wells is unlikely within, or in the immediate vicinity of,the affected groundwater due naturally occurring high TDS concentrations and likely low yield. Any future development near the Site will likely be connected to the City of Tracy municipal drinking-water supply. Current or future uses of the affected groundwater are 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 FOR CASES EXCEEDING WATER QUALITY OBJECTIVES I A narrative summary response is provided below for each numbered item in section 6.6 of the Tri-Regional Recommendations. 1. Site history and current site conditions. The Site encompasses an approximately 7,000-foot-long corridor along West Byron Road in Tracy,California,and is defined as the area investigated(Figure 2). The corridor trends from the northwest near the intersection of West Byron Road and Von Sosten Road,to the southeast near t the intersection of West Byron Road and North Corral Hollow Road. In general,the Site is bounded by other investigation sites to the northeast and southwest of the corridor. West Byron Road mainly serves residential properties and small businesses. The area is approximately 35 feet above mean sea level with relatively flat-lying topography. The Site includes ROWs associated with-the former OVP and TAOC pipelines. The OVP was installed between 1902 and 1904 as a"hot line"(i-e.,the oil was heated to facilitate transmission), and carried San Joaquin Valley crude oil(SJV crude)north from the Kern River Oil Fields (in and near Bakersfield)to the Richmond Refinery. The pipeline and associated pump stations operated from 1903 until the early to mid 1930s. The OVP was again used during the early 1940s to primarily transmit Bunker C fuel oil from the Richmond Refinery to railroad hubs in Tracy. The former OVP alignment at the Site runs along the south side of West Byron Road. The former TAOC alignment at the Site lay within the UPRR ROW, located on the north side of West Byron Road. The TAOC pipeline system was constructed in 1907 and transmitted heavy crude oil from the southern San Joaquin Valley to the Bay Area. For a relatively short time span the pipelines reportedly transmitted a cutter stock with the crude oil between Coalinga and the Bay Area; the cutter stock was used to reduce the viscosity of the oil. The TAOC pipelines were abandoned in the 1970s. The pipelines were either removed or abandoned in place. An active KMEP pipeline is located along the south side of the UPRR ROW. The KMEP Ipipeline reportedly transports refined petroleum products. 5 SAIL 1