progress

A very important bit of information.

Wendy Cheung
USEPA, Region VIII
. 1595 Wynkoop Street
Denver, Colorado 80202-1129
RE: Ross Disposal Wellfield, UIC Class I Application 10-263
Crook County, Wyoming
Dear Ms. Cheung:
In accordance with the Memorandum of Agreement (MoA) between the Wyoming Department of Environmental Quality (WDEQ) and the United States Environmental Protection Agency(USEPA), please be informed that WDEQ has determined that application 10-263 from Strata Energy, Inc., for an Underground Injection Control (UIC) Class I area permit is complete and technically adequate. Draft permit 10-263 is for five proposed wells: Ross DW No. 1, Ross DW
No. 2, Ross DW No. 3, Ross DW No. 4, and Ross DW No. 5.
WDEQ is classifying waters in the Deadwood and Flathead aquifers within the areas of review for each disposal well as Class VI because the wells are "located in such a way, including depth below the surface, so as to make use economically and technologically impractical" [Water
Quality Rules and Regulations, Chapter 8, Section 4(d)(ix)(C), 40 CFR 147.2550(a)(3)]. There are no aquifers below the proposed discharge zones.
WDEQ has determined that its groundwater classifications in this case conform to USEPA exemption of said portions of these aquifers under 40 CFR 146.4(a) and 146.4(b)(2). The designated Class VI waters also meet exemption criterion 146.4(c). The basis for WDEQ's groundwater classifications is described under the heading "Basis for Class VI Classification" in the attached 'Supplemental Information.' In accordance with the MoA and Wyoming's UICprogram description as accepted for delegation by USEPA, please review these materials for consistency with Wyoming's groundwater classification criteria