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Comments on the "Preliminary Endangerment Assessment Work Plan For Former RV CIRCUITS FACILITY 916 South Center Street, Stockton, California" Sampling Plan Comments 1. The work plan only addresses the RV Circuits facility. The site history mentions that an auto body shop formerly occupied the site. The work plan does not specify whether a historical record search was made to determine whether releases may have occurred during the auto body shop's operation. At a minimum, city and county emergency response agencies (such as the County Office of Emergency Service's hazardous materials team and the Stockton Fire Department) should be contacted and the results of the search documented in the work plan. If releases are determined to have occurred during operation of the auto body shop, the sampling portions of the work plan should be reevaluated in light of the new information. 2. The work plan content addressing the asbestos, lead paint, and polychlorinated biphenyl surveys has not been evaluated by DTSC because the plan states that they are being conducted to receive an occupancy certificate from the county health department and is outside the scope of the preliminary endangerment assessment (PEA). 3. All soil borings should be logged using the American Society for Testing and Materials Standard D 2488. 4. All soil borings should be properly abandoned to ensure that they do not become conduits for migration of contaminants. The methods and materials utilized for abandoning boreholes should be provided in the work plan. 5. Soil samples should be selected for analysis based on which soil types the contaminants are most likely to be found in and not default based pre-selected depths. As discussed, soils that appear to be impacted by site operations should be selected for analysis. One goal of the PEA is to sample the most highly contaminated portions of each medium. 6. Background soil samples should be obtained from the same soil types as those samples to be analyzed. In addition, all background samples should be analyzed for the same constituents as other samples for comparative purposes. 7. The number of samples and criteria for selecting the actual locations for wipe samples need to be specified. In addition, the rationale for selecting the Whitman Glass Fiber No. 692 filter paper should be included. 8. All quality control/quality assurance (QA/QC) samples should be analyzed to ensure that the analytical data obtained is reliable. A minimum of 5% of samples collected should be collocated or replicate samples for QA/QC purposes.