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SUPPLEMENTAL SITE INVESTIGATION WORK PLAN South Pointe Property Stockton, California Scope of Work groundwater samples will be analyzed for total petroleum hydrocarbons (TPH) as gasoline, diesel, and motor oil. - In previous comments, DTSC noted that fertilizers have been documented to be a constituent of concern by the State Water Resources Control Board and requested review of historical data from onsite wells MW-34 and -35 (associated with the L&M Operable Unit site) to see if groundwater had been assessed for nitrogen and perchlorate. No such data could be located; therefore, grab groundwater samples will additionally be analyzed for nitrogen and perchlorate. Table 3 summarizes the groundwater sampling program. 4.2 ANALYTICAL METHODS AND SCREENING CRITERIA Tables 1 through 3 summarize the analytical program for soil and groundwater samples.Tables provided as Appendix D list the proposed analytical method for each analyte group (i.e. VOCs, PCBs, etc.), individual analytes for each analyte group, and proposed screening levels for each analyte. In general, we propose using current residential DTSC Screening Levels (SLs) for screening levels. Where SLs are not established, we refer first to USEPA Regional Screening Levels (RSLs), and then to Environmental Screening Levels (ESLs) established by the San Francisco Bay Regional Water Quality Control Board. For evaluation of TPH compounds in groundwater, we refer to ESLs. Per previous communication from DTSC, samples retained for VOC analysis will be collected in accordance with USEPA Method 5035. 4.3 PRE-FIELD ACTIVITIES 4.3.1 Health and Safety Plan A site-specific health and safety plan (HASP) for the proposed subsurface investigation activities is included as Appendix E. The purpose of the HASP is to describe controls and procedures that will be implemented to minimize incidents, injury, and health risks associated with excavation and exposure to site CDCs. All field personnel will review the HASP prior to commencement of field work. Prior to the initialization of daily field activities, a safety meeting will be conducted at the site with all workforce. All on-site workers operating under Stantec supervision will be required to sign the daily safety meeting attendance log. 4.3.2 Utility Clearance Prior to initializing drilling activities, Stantec will mark the work locations in white paint, open a one-call dig ticket with Underground Service Alert, and coordinate with responding utilities as appropriate. Stantec will subcontract with a private utility locator to confirm that proposed drilling locations are free of detectable subsurface utilities or obstructions. 4.3