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1.0 INTRODUCTION 1.1 BACKGROUND Versar, Incorporated (Versar), on behalf of the Sacramento District Corps of Engineers (SD- COE) and the California Army National Guard (CARNG), has prepared this health and safety plan for a Preliminary Assessment / Site Investigation Update (PA/SI Update) at the Stockton California Army National Guard Complex in Stockton, California (Site). The PA/SI Update is being performed to address residual environmental issues identified at the Site in the PA/SI report prepared by Versar on behalf of the CARNG in May 2000. The Site is divided into four divisions: 1) the Army Aviation and Support Facility (AASF); 2) the Combined Support and Maintenance Shop (CSMS); 3) the Operation and Maintenance Shop (OMS); and 4) the Armory. Environmental concerns were not identified at the Armory. Versar's 2000 PA/SI identified residual petroleum hydrocarbons in soil at two locations at the OMS and one location at the CSMS. Buried objects in the vehicle storage area east of the CSMS were also investigated. In the PA/SI Update, the petroleum hydrocarbons in soil at the OMS and CSMS will be further investigated, the buried objects east of the CSMS will be excavated and secured on Site, a recent fuel spill will be assessed at the AASF, and three monitoring wells at the AASF will be sampled. 1.2 SITE CHARACTERIZATION Client Name: Sacramento District Corps of Engineers (SD-COE) and the California Army National Guard (CARNG), Location: 8010 Airport Way and 2000 Stimson Road, Stockton, California Client Contact Person(s): Mr. Gary Krongard, SD-COE Capt. Ken Koop, CARING Topograpby of the area surrounding the site: Hilly —Flat X_ Hummocky Marshy Mountainous Other Area affected: Urban Rural _X_ Residential Industrial Commercial _ Other _X_(Airport) Types of bodies of water bordering the site, if any: 3025-03/114700.4766.023/NI? 3'03