ARCHIVED REPORTS XR0000211 - Laserfiche WebLink

Home Browse Search

SECTiON®NE The preliminary site assessment phase includes irntial site investigation, initial abatement actions, initial site charactenzation and any interim remedial action (Cal Code of Regs Title 23 § 2723, subd (a)) Corrective action is complete at the conclusion of the preliminary site assessment phase, unless conditions warrant a soil and water investigation A soil and water investigation is required if any of the following conditions exists (1) There is evidence that surface water or groundwater has been or may be affected by the unauthorized release, (2) Free product is found at the site where the unauthorized release occurred or in the surrounding area, (3) There is evidence that contaminated soils are or may be in contact with surface water or ground water, or(4)The regulatory agency requests an investigation, based on the actual or potential effects of contaminated soil or groundwater on nearby surface water or groundwater resources or based on the increased risk of fire or explosion (Cal Code Regs, Title 23, §2724) The purpose of a soil and water investigation is "to assess the nature and vertical and lateral extent of the unauthorized release and to determine a cost-effective method of cleanup " (Cal Code of Regs, Title 23, §2725, subd (a)) SWRCB Resolution 92-49, Policies and Procedures for Investigation and Cleanup and Abatement of Discharges Under Water Code Section 13304, also applies to petroleum UST cases Resolution 92- 49 directs the RWQCBs to ensure that water affected by an unauthorized release attains either back ' ground water quality or the best water quality which is reasonable if background water quality cannot be restored (SWRCB Resolution 92-49, M G) Any alternative level of water quality less stringent than background must be consistent with the maximum benefit to the people of the state, not unreasonably affect current and probable future beneficial use of affected water, and not result in water quality less than that prescribed in the water quality control plan for the basin within which the site is located (hereafter basun plan) Resolution 9249 does not require, however, that the requisite level of water quality be met at the time of site closure Even if the requisite level of water quality has not yet been attained, a site may be closed if the level will be attained within a reasonable period(SWRCB Resolution 92-49, III A) The Fourth Edition of the Water Quality Control Plan(Basin Plan) for the Sacramento River and San Joaquin River Basins dated September 1, 1998 designates existing and potential beneficial uses of groundwater in the San Joaquin River Basin as municipal and domestic (ARUM supply, industrial service supply, agricultural supply, and industrial process supply(located on page II-3 00) In making any exception to the beneficial use designation of municipal and domestic supply (MUN), the Regional Water Board will apply the criteria in State Water Board Resolution No 88-63, 'Sources of Drinking Water Policy' The criteria for exceptions are WO*dw=dl4Wa ® T1/687W3008NA1STOCKTOMREPORTalOREP#1 DOC%+ME 99MMOOMMSNA 1-2