SU0009625 SSCRPT - Laserfiche WebLink

Home Browse Search

1999. No Further Action Required letter approved by the Executive Officer was issued to Chevron on 19 November 2009." According to the Soil and Groundwater Investigation Report at Lyoth Loading Station (SAIC, 2005), petroleum-affected soil remains in the vicinity of the former 55,000-barrel AST (adjacent to the north of the Site), including crude oil (TPHc) at concentrations up to 20,250 mg/kg and polycyclic aromatic hydrocarbons (PAHs) up to 14,000 mg/kg beneath the footprint of the former AST. However, no detectable crude oil was found in the boring closest to the Site in 1995; the sample was collected at a depth of 12 feet. Because crude oil is not particularly mobile in soil, it is considered possible but unlikely that the Site could be impacted by the remaining contamination at the former Lyoth Loading Station at some point in the future. • Chevron, Lyoth--Offsite, 26501 S. Banta Rd. The contaminants of concern in this GeoTracker case are crude oil and gasoline, soil, soil vapor, and groundwater have reportedly been affected. The case was closed in 2009. "The Site is located ... on approximately 3 acres. The parcel is triangular in shape. It was historically the Site of the Old Valley Pipeline (OVP) from the 1900s to the early 1960s. The OVP carried crude oil and bunker C locomotive fuel from Bakersfield to Richmond. Currently it is in use as a towing yard. A series of investigations starting in December of 1990 have delineated the impacts to soil and groundwater. Quarterly ground water monitoring has been ongoing since April of 1997. In July of 2002 the monitoring frequency decreased from quarterly to semi annually. All samples have indicated very low levels of petroleum hydrocarbons. No Further Action Required letter approved by the Executive Officer was issued to Chevron on 19 November 2009." • Chevron, Lyoth—Banta Road, 26501 S. Banta Rd. The contaminants of concern in this GeoTracker case are "other solvent or non-petroleum hydrocarbon" and crude oil; soil has reportedly been affected. The case was closed in 2011. "The Site is located ... on approximately 2 acres. Historically the Site has been the location of the Old Valley Pipeline (OVP)... In December of 2003, the South San Joaquin Irrigation District installed 30 inch diameter water main along the east side of Banta Road. During the installation petroleum hydrocarbon impacted soil was encountered from approximately 11 to 19 feet below grade surface. A workplan to delineate the extent of the impact was competed in April of 2006. The investigation indicated the presence of crude oil. Additional investigations were completed for groundwater and indicated that it has not reached the depth of the groundwater. Chevron's consultant (SAIC) completed a risk assessment documentation for no further action. On 6 January 2011, RB staff issued a NFAR determination and the case was closed." • Union Pacific Railroad, S. Banta Rd. The location of this GeoTracker case is unclear. A leak of "petroleum/fuels/oils" was reported in 1965; as of 2009, the case has a status of "open--inactive." No further information was provided by GeoTracker. The Union Pacific Railroad tracks lie approximately 250 feet northeast of the Site; as a result, this case has a low potential to impact the Site. LOGE 1303 Page 6