John F. Kennedy High School Proposed Building C-A2 Area Removal Action Work Plan

John F. Kennedy High School Proposed Building C-A2 Area Removal Action Work Plan

The Removal Action Work plan (RAW) presents the clean-up procedures for the excavation and off-site disposal of soils contaminated with arsenic. During the proposed excavation, unauthorized persons will not be allowed on the site. The RAW, prepared in accordance with Health and Safety Code Section 25356.1(h)(1), includes the excavation and disposal of approximately 198 cubic yards or 14 truckloads of arsenic contaminated soil from the site. Soils will be removed with a backhoe. Excavated soil will be directly loaded by a back-hoe or a front-end loader into transport trucks for transportation and disposal. The concentration of 10 mg/kg for arsenic has been determined as the clean up level, which DTSC has determined to be protective of human health and the environment. Upon completion of excavation work, confirmation sampling will be conducted to verify that all soils above the cleanup level have been properly removed, and the site is safe for construction and occupancy of a classroom. The depth of excavation will be from surface soils up to a maximum depth of 3 feet below ground surface. Excavation and sampling activities are expected to begin in April 2004 and take less than thirty (30) days to complete. All fieldwork will be completed by properly trained and equipped hazardous waste workers. While John F. Kennedy High School classroom buildings are adjacent to the site, controls have been developed to minimize dust generation. Soil wetting and air monitoring (at property perimeter and work area) will occur during the removal action. Furthermore, the site will be stabilized and no excavation will be conducted in times of high wind conditions. The nearest receptors to the excavation are residents approximately 300 feet north of the excavation. In an event that the soils are excavated and cannot be directly loaded for transportation off-site, it will be temporarily stored in staging areas on-site. At the staging areas, all excavated soil will be placed in covered rool-off truck bins or stockpiled on a impermeable barrier and bermed to prevent runoff, and sprayed with water and covered with plastic, if necessary, to prevent dust generation. Each excavation area will be secured and water will be used to control any fugitive dust from blowing onto other areas or properties. All excavated soils will be characterized to determine if soil will be exposed of as either non-RCRA California regulated hazardous waste or non-hazardous waste. Based on the maximum concentration of 32 mg/kg, it is anticipated that the excavated soils will be exposed of as non-hazardous wastes, loaded onto trucks, covered and transported in taped trucks to an approved Class III landfill or fill material on approval by the County of Orange, Integrated Waste Management Department. If the soil is determined to be hazardous waste, then it will be transported to an approved Class I landfill for disposal.

La Palma

Orange