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STATE OF CALIFORNIA - ENVIRONMENTAL PROTEC. ..;ENCY PETE WILSON, Governor DEPARTMENT OF TOXIC SUBSTANCES CONTROL 700 HEINZ AVENUE, SUITE 200 BERKELEY, CALIFORNIA 94710 Fact Sheet SRI International, Corral Hollow Experimental Site Closure of Hazardous Waste Open Air Detonation Unit This fact sheet describes facility operations and closure activities at Stanford Research Institute (SRI), International, Corral Hollow Exp erirnent Site (CHES). SRI has ceased operating and is proposing to formally close its hazardous waste open detonation area. The U.S. Environmental Protection Agency (EPA) and the California Environmental Protection Agency (Cal -EPA), Department of Tn;�c R»bstances Control must review and either approve or modify the closure plan submitted by SRI. In addition, Cal -EPA proposes to issue a Negative Declaration on the closure project in accordance with the California Environmental Quality Act (CEQA). Cal -EPA finds there is no potential for significant effect to the environment from the closure. Cal -EPA is asking for comments from the public on SRI's Closure Plan and on the proposed Negative Declaration. I, ,_' 11 1 The facility is located on Corral Hollow Road, adjacent to the Carnegie State Vehicular Recreation Area (see location map). SRI is situated in a rugged isolated area near the Alameda County, San Joaquin County line and is approximately 12 miles southwest of the City of Tracy and 15 miles southeast of the City of Livermore. The nearest residences are roughly five miles from the active portion of the facility. Facility Description SRI, CHES is an explosive research facility and has been in existence since 1965. SRI conducts explosive test at several areas at the site. SRI uses the explosive pentaerythritol tetranitrate (PETN) in their experiments. Odd shaped scrap explosive material is produced when small amounts (50 to 100 grams) of sheet material is cut off the test piece. Up until 1988, SRI eliminated left over scrap explosives through detonation. This occurred at a site near Area 2. Soil from this location was tested in 1987. No contamination was found at that time. SRI has altered their process and currently all explosive material, including odd shaped material, is expended in research operations. The odd shape pieces are now used in training and experiments not requiring specific shapes.