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CX-007443: Categorical Exclusion Determination

Routine Site Activities at the Shirley Basin South, Wyoming, Disposal Site
CX(s) Applied: B1.3, B1.11, B1.20, B3.1
Date: 12/13/2011
Location(s): Wyoming
Offices(s): Legacy Management

Routine site activities include collection of water samples from groundwater monitoring wells, use of herbicides to spray invasive weeds, and mapping weeds on the site in alternate years to evaluate effectiveness of weed control efforts. In addition, a grazing licensee who runs 100 head of cattle on the site (approximately one month per year) proposes to install a gravity-fed water supply source. Potable water would be obtained, in accordance with license stipulations, from an existing well on the site, stored in an estimated 500-gallon water storage tank, and conveyed to a stock water tank by an approximately 600-foot-long buried pipeline. The water source would also benefit wildlife use of the site. The licensee also proposes to install an antelope-friendly electric fence to better manage use of the site. No fencing would be allowed on the disposal cell. Potential future activities may include cutting and baling hay on the top surfaces of the disposal cell.