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• 0 ! ! DRAFT WORK PLAN AMERICAN FOREST PRODUCTS COMPANY STOCKTON, CALIFORNIA 1 0 SCOPE OF WORK The scope of work for this project is designed primarily to assess groundwater quality in the area of two former Underground Storage Tanks (UST) at the Former American Forest Products Company (AFPC) site, located in Stockton, California (Figure 1) This Work Plan has been prepared in response to an August 3, 1998 request to AFPC from the San Joaquin Public Health Services Environmental Health Division (PHS/EHD) A copy of PHS/EHD/s letter is attached in Appendix A The USTs were removed in 1988 Groundwater at the site has been monitored since the tanks were removed Monitoring is currently being conducted according to a Work Plan prepared by Dames & Moore, dated August 27, 1996 However, groundwater levels at the site have been risen, resulting in a situation where the well screens are below the water surface The existing sampling program is intended to test for the potential presence of Total Petroleum Hydrocarbons as Diesel (TPHD), which has a lower density than water and tends to float on the water surface Therefore, there is a possibility that the existing wells do not allow for an accurate assessment of TPHD in the groundwater Furthermore, the rising groundwater level creates a situation where water contact with TPH contaminated soil could possibly occur Because of these two factors, further investigation and documentation has been requested by the PHS This Work Plan is intended to address the PHS request The proposed scope of work for the project includes the following tasks • Installation of two (2) groundwater monitoring wells, • Four (4) quarterly sampling events at two (2) new monitoring wells for one year, • Analysis of groundwater samples for Total Petroleum Hydrocarbons as Diesel (TPHD), • Preparation of a letter report after each water sampling event, and • Preparation of a Summary Report following completion of four quarterly sampling events 20 WELL INSTALLATION METHODS AND PROCEDURES Presented in this section are the tasks associated with the installation of groundwater monitoring wells required for site assessment The purpose of the site assessment is to assess potential diesel impacts under current groundwater elevations and conditions, and assess groundwater depth and flow direction 2 1 Health And Safety Plan Upon the approval of this Work Plan, a site-specific Health and Safety plan (HSP) will be developed in compliance with the California Occupational Safety and Health Administration (Cal/OSHA) Hazardous Waste Operations and Emergency Response (HAZWOPER) standard (8 CCR 5192) The HSP will be prepared under the direction of a Certified Industrial Hygienist DAMES&MOORE