HYDRO29226

• Permit No: C1980001
• IBM Index Class Name: Hydrology
• Doc Date: 10/5/2006
• Doc Name: Groundwater Points of Compliance Determination
• From: DRMS
• To: Pittsburg & Midway Coal Mining Co
• Permit Index Doc Type: Correspondence
• Media Type: D
• Archive: No

Page 8
There are thirty-six well permits (WP) registered with the State Engineer within a mile of the
permit area53. Of these, only those that have been recorded as drilled aze considered herein. The
locations of wells considered germane to this determination have been plotted on Exhibit 4.6-26
of the PAP.
Two bedrock wells, WP 94607 and WP 209186, are west of the Edna permit area, appear to be
drilled into the Trout Creek Sandstone, and are used for domestic purposes (highest declared use
on the well permit). Well (WP) 209186 is located in Section 14, Township 4 North, Range 86
West, 6~' Principal Meridian (Sec 14 T4N R86W). We1184607 is located in Sec 36, TSN R86W.
This well is TCS-1 of the monitoring program. There is no Trout Creek Sandstone to the east of
the permit azea (the Trout Creek Sandstone outcrops on the eastern side).
There is only one registered down gradient Trout Creek alluvial well within a mile of the Edna
mine permit, and it is west of Trout Creek. This use of this well, WP 63790, located in Sec 25
TSN R86W, is for domestic purposes. Although this well is in alluvial materials, it appears to be
on an alluvial terrace above the flood plain.
There aze two additional alluvial wells permitted (WP 57843 in Sec 19 TSN R85W and WP
57844 in Sec 18 TSN R85 W) nearly two miles downstream of the permit boundary. These wells
have not been recorded as having been drilled. These permits are for "other" use purposes
(monitoring). The next recorded wells nearest the Edna permit area are nearly two and a half
miles north (downstream) on Trout Creek. Of these four, three (WPs 90792, 240793, and
237610) are bedrock wells. One permit, WP 199787, is for an alluvial well, but there is no record
of the well having been drilled. All four of these wells were recorded for domestic purposes.
They are all located in Sec 18 TSN R85W.
There aze three alluvial monitoring wells and one bedrock monitoring well in the Edna permit.
The bedrock well, TCS-l, is the registered well 84607. The three alluvial monitoring wells are
not recorded with DWR. They aze TR-1.5 located in Sec 14 T4N R86W, neaz the upper end of
the mined area; TR-2 located in Sec, TR-3 located in Sec 36 TSN R86W near the north (lower)
end of the mined area; and TR-4 located in Section 30, TSN R85W, approximately a mile
downstream of the permit azea.
CWQCCR 41
Basic standazds for ground water are contained in this regulation. Basic standards apply to
various classifications, and, in turn, the classifications are a function of use.
Designation of Specified Areas
There are two bedrock wells, WP 94607 and WP 209186, within a mile of the permit area, and
three bedrock welts, WPs 90792, 240793, and 237610, within two and a half miles of the permit
area. All of these wells are in the Trout Creek Sandstone. The structural geology in this portion
of the Trout Creek valley is a syncline. As a result, the Trout Creek valley, from the up-stream
s3 S[a[e Engineers Office