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0 9 COMMENTS ON THE CHEROKEE TRUCK SHOP 1) The RAW should contain an Executive Summary and a list of definitions acronyms and abbreviations used in the Removal Action Work Plan (RAW). The Executive Summary should contain a summary of the RAW and the planned public participation strategy. The public participation strategy should include a 30-day public comment period, fact sheets will be mailed to the site mailing list, a public notice will be placed In the newspaper, and DTSC will respond to all comments related to the project. The RAW's executive summary must also state the RAW is equivalent to an Engineering Evaluation and Cost Analysis as required by the National Contingency Plan (NCP). 2) The RAW should discuss the following in Section 2, entitled "Background": • The site location, including the street address and crossroads, United States Geological Survey topographic map quadrangle, and the latitude/ longitude. • The type of facility and operation status, including years of operation, present / prior site use, and regulatory history. The regulatory history should include previous responses, investigations, and litigation by State, local, and Federal agencies. • The structures and topography, including the facility size / dimensions, boundary descriptions, land cover, utilities / transportation features, buildings, drainage channels / pathways, open ditches/ canals, and power lines/ pipelines. • The meteorology, including the average rainfall, temperature ranges, and wind conditions. • The surrounding land use and populations, including residential, industrial, or commercial land use, possible pathways of exposure, description of drinking water sources, and identification of sensitive populations. 3) The RAW must adequately characterize the extent of the landfill. The data which defines the northern, southern, western, and eastern boundaries of the contaminated area must be clearly summarized, noting any potential data gaps. The RAW should reference aerial photos and boring information to document the extent of contamination. Additional soil samples should be identified to address data gaps. The additional soil samples should be collected at a minimum of 5 feet below the ground surface because the contamination is approximately 5 to 13 feet below the ground surface. Complete characterization is necessary to evaluate and established a soil remedy and to define boundaries of contaminated soil being left in place and subject to a land use covenant(LUC). 4) In support of the proposed remedy, the RAW should discuss protection of groundwater. An evaluation following the California Central Valley Water Quality Control Boards (CCVWQCB ) designated level methodology (DLM) would need to be completed to show residual soil would not be a threat to the groundwater. This demonstration would need to be supported by di-ionized waste extraction test (di- WET) samples of soil. Di-WET samples were collected from the stockpiles in the mid- Page 1 of 5