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NON-TRIBUTORY GROUND WATER ANALYSIS
OXY USA WTP LP
POND 10
CENTRALIZED E & P WASTE FACILITY
The OXY USA WTP LP (Oxy) Pond 10 Centralized E & P Waste Facility will contain only non-
tributary water produced from the following formations:
Undifferentiated Wasatch Formation,
Mesa Verde Group, including the following:
o Williams Fork Formation including the Ohio Creek, Williams Fork Units 1-4, and
the Cameo Units 1 & 2;
o Iles Formation including the Rollins, Cozzette and Corcoran units.
Niobrara, located in the Mancos Shale Formation.
All Cascade Creek wells produce water from one of the above-mentioned geologic formations.
Included in this analysis is the “Produced Nontributary Ground Water Rules” issued by the
Department of Natural Resources – Office of the State Engineer. This document includes a
description of the non-tributary formations of the Piceance Basin and maps demonstrating the
locations of these formations.
Section 17.7 A through D of the “Produced Nontributary Ground Water Rules” document
contains descriptions of ground water determined to be non-tributary by the State Engineer.
Also included in this analysis are the following documents:
x Maps of Oxy operations located in Garfield County in relationship to the non-tributary
formations;
x A list of Oxy wells and with codes that identify the producing formation;
x The COGCC Formation Codes that identify the formations.
The maps of the Oxy operation identify that the wells are within the non-tributary area identified
by the “Produced Nontributary Ground Water Rules” Section 17.7 A - D. The list of Oxy wells
identifies each producing formation were the water originated. All of these formations are
identified by the State Engineer as non-tributary.
These documents demonstrate that the produced water from Oxy operations is non-tributary
ground water.
Attachments
A - “Produced Nontributary Ground Water Rules”
B – Cascade Creek Operational Area Maps (2)
C – List of Cascade Creek wells and producing formations