REMOVAL_2019 - Laserfiche WebLink

Home Browse Search

Remedial Action Plan CVE# D17124 Westside Market, 729 N. Central Ave., Tracy, California Page 3 Selenium ND 0. 50 Silver ND 0 . 50 Thallium ND 0. 50 Vanadium 43 0.50 Zinc 150 5.0 mg/kg (ppm) = milligrams per kilogram (parts per million) TPH-g = total petroleum hydrocarbons as gasoline BTEX = benzene, toluene, ethylbenzene, and total xylenes TPH-d = total petroleum hydrocarbons as diesel TPH-mo = total petroleum hydrocarbons as motor oil ND = not detected at or above the R.L. VOCs = volatile organic compounds SVOCs = semi-volatile organic compounds * = please refer to attached analytical report for complete list of Reporting Limits According to laboratory results, trace concentrations of diesel and motor oil-range hydrocarbons were detected in the soil sample. No gasoline-range hydrocarbons , grease, PCBs, VOCs, or SVOCs were detected. With the exception of an elevated total lead concentration , metals concentrations appeared to be consistent with naturally occurring concentrations. PROJECT OBJECTIVE AND SCOPE The objective of this project is to conduct a Remedial Action involving excavation of hydrocarbon- impacted soil in the area of former USTs . It is proposed that hydrocarbon-impacted soils be excavated to meet the requirements for closure criteria contained in the State Water Resources Control Board's Low- Threat Underground Tank Case Closure Policy. The scope of services proposed for this remedial action is as follows: • Using an excavator, hydrocarbon-impacted soils around and beneath the former UST locations would be excavated . When field indications suggest that impacted soils have been removed , up to five (5) confirmation soil samples will be collected from the excavation's bottom and sidewalls . Two sidewall samples will be collected at a depth approximately five feet below surface grade and the other two sidewall samples will be collected at a depth approximately 10 feet below surface grade. The remaining confirmation sample will be collected from the bottom of the excavation, presumably at a depth no greater than 20 feet. • Confirmation samples will be analyzed for the presence and concentration of total lead by EPA Method 6020. • Excavation activities will be considered complete when analytical results of the confirmation samples meet the following conditions: o combined TPH concentrations are less than 100 mg/kg , o benzene, ethylbenzene and naphthalene concentrations in the upper 5 feet are no greater than 1 . 9, 21 mg/kg and 9.7 mg/kg , respectively, o benzene, ethylbenzene and naphthalene concentrations between 5 and 10 feet are no greater than 2 . 8, 32 mg/kg and 9.7 mg/kg , respectively,