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CIWMB April 14, 2003 Santa Fe Road Disposal Sites Project No. 104690003 ness of refuse and/or debris. Figure 2 indicates the estimated aerial extent and thickness of burned refuse with and/or without refuse and/or debris. The following assumptions and limitations were used to estimate the rough order-of-magnitude volumes of buried wastes: • Except where actual trenches were excavated, all areas of buried wastes (Figures 1 and 2) are estimates only and are based on limited field investigation data. The lines indicating the aerial extent and thickness of buried wastes were arrived at based on the widely spaced trenches and are assumed estimates only. • Only observations made at trench locations were used to estimate the waste volume quanti- ties. There are areas where there are no trenches and at these locations the closest available data was used and assumptions were made based on the field investigation. • Rough subjective interpolation was used to estimate the types, thickness, and extent of bur- ied wastes between trenches. • Only the northwest portion of the Waller Property was evaluated which only consisted of excavating seven trenches. • There is only limited data for the westerly property boundary of the Lynch IDS in the area to the adjacent east of the railroad tracks. It was assumed that wastes, when encountered in trench excavations near the central and eastern portion of the site, extended to the westerly property boundary with the railroad tracks. • At each location, for purposes of estimating a volume of buried wastes, within each thick- ness range, the buried wastes were assumed to be a continuous layer. Although field observations from this assessment indicated discrete trenches containing buried wastes, con- tinuous layers were assumed for conservative estimates. Trenches containing up to 5 feet thickness of buried wastes were assumed to have an average waste thickness of 2.5 feet. Ar- eas estimated as having 5 to 10 feet of wastes were assumed to have an average waste thickness ranging from 5 to 7.5 feet, depending on the actual thickness of wastes as recorded on the individual trench logs. Areas having wastes of 10 to 15 feet and 15 to 20 feet were as- sumed to have a waste thickness of 11 to 12.5 feet (depending on actual waste thicknesses as recorded on individual trench logs), and 18 feet respectfully (Figures 1 and 2). • The soil mixed in with the buried wastes was considered as part of the wastes for the volume estimates. • If more than one type of buried waste (e.g. burned refuse and construction and refuse) was observed in the same trench, the materials were separated to differentiate the burned materi- 104690003 SFRDS Waste Volume Estimate PDF.doc 2