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_ ENV/RONMENTAL 2.0 SITE HISTORY AND BACKGROUND TECHNOLOG/ES 2.1 Site Location The Forward Waste Management Facility is located on Austin Road, seven miles southeast of the City of Stockton in California. The south fork of Littlejohns Creek traverses the southern portion of the 157-acre site. The overall site location is shown in Attachment A and site details are presented in Attachments B through .E (see Appendix A). ' Waste treatment, storage, and disposal have occurred on 60 acres of the site. The facility currently contains eight Waste Management Units (WMUs), as detailed in Attachment B. Four of these WMUs are inactive. The inactive units include three Class III landfill WMUs (planned for closure, pending regulatory approval)and one closed Class I landfill WMU (WMU A, which had formerly been a Class II-1 unit). The active WMUs are presented in Attachment C. These active units include: one Class III landfill (WMU D88); one interim Class II surface impoundment for landfill leachate (WMU F), constructed to the standards of Title 23, California Code of Regulations (CCR), Chapter 3, Subchapter 15; and one Class H land treatment unit(WMU G) for petroleum-contaminated soils. A Class II landfill dedicated to coal ash disposal is also operated at the facility, and a Class II landfill is planned for WMU D-89. The Forward Landfill is underlain by the Victor Formation. This is a heterogenous formation composed of fan and floodplain deposits derived from Sierra granitics, metamorphic, and ' volcanic. Geologic materials immediately beneath the WMUs are lenticular clay, silt, sand, and minor amounts of gravel. The shallow ground water beneath the site is contained in the Victor Formation and recent alluvium. Generally, these sediments have moderate permeabilities. Ground water in the Victor Formation is unconfined, and flows in a north-northeasterly direction beneath the site. The ground-water table is 30 to 45 feet below the bottom of the WMUs. Land within 1,000 feet of the site is used for agricultural purposes. There are no known Holocene faults within 200 feet of the Forward Landfill. The closest active fault is the Greenville Fault, approximately 28 miles west-southwest of the site. A maximum credible earthquake in the area would produce a ground acceleration of 0.2g at the facility. ' 2.2 Descriptions of WMUs WMU A - This unit was constructed in 1979 and was in operation until October 1984. The ' unit received permits to construct and operate before November 27, 1984, the effective date of Subchapter 15. WMU A consists of four north-south trending trenches, covering eight acres. 2 7255 Soroni Drive•Ooklond,Colifornio,USA 94611 ' TEL(415)339-1543-FAX(415)339-6775