HYDRO20478

• Permit No: M2006046
• IBM Index Class Name: Hydrology
• Doc Date: 8/13/2007
• Doc Name: Groundwate Monitoring Baseline
• From: Banks & Gesso LLC
• To: DRMS
• Media Type: D
• Archive: No

_ ~ o: 6~~ZN~S ~ 5r`~i sss ~~, ~
C ~~~~~~ feet/ed. 7-~1" ©~ P.O. Box 1301
~~~~~' ~ Rifle, CO 81650
£ N fi I N E E R I N 6 Tel [phone]
INCORPORATED Fax [phone]
June 12, 2007
Mr. Alex Schatz / ~-~,{"j(p-O'-1(~ t/
Fyawt Banks & Gesso LLC / Al1G s +2007
720 Kipling St., Suite 117 Division of Reclamation,
Lakewood, Co. 80215 Mining and Safety\\
RE: Job # 645 -Hangs Ranch -Silt Sand & Gravel -(roundwater Monitoring ~a1p,~iirel~
Deaz Mr. Schatz: JJ
Colorado River Engineering, Inc. (CRE) has prepared the following letter report
summarizing data collected as pari of our investigations into groundwater elevations at
the Hangs Ranch Property, located south of Silt, Colorado. Our investigations involved
the portion of the Hangs Ranch Property generally lying south if the Colorado River, east
of Interstate 70, and north of County Road 346, as shown on the attached Figure I. The
original purpose of our investigations was to examine groundwater hydrology with
respect to wetlands on the property. The research can be used to document existing
conditions and identify groundwater levels over the last year.
Background
Twelve monitoring holes were constructed at various locations on the subject property,
near possible wetland areas. The three monitoring wells, (Wl-W3), that were originally
constructed as part of the mineral resources investigations, were also used in our
groundwater investigations. Monitoring holes 1-11 were constructed prior to April 27,
2006 and each consist of approximately 6-feet of 2-inch pvc pipe with several slots cut
into the bottom end of each pipe. The pipes were installed in holes excavated by backhoe
and backfilled to approximately the natural ground surface level, with 2-feet to 3-feet of
pipe remaining above the ground surface. Monitoring hole 12 consists of approximately
8-feet of pipe and was installed on approximately April 28, 2006 in an area along the
eastern edge of the property neaz the Colorado River. To allow for the measurement of
relative river water level, a staff gage was installed along the south bank of the Colorado
River, approximately 175-feet east of the Interstate 70 river crossing. Monitoring holes
13 through 18 were constructed in the Fall of 2006.
Bookcliff Survey Services of Rifle, Colorado surveyed the locations and elevations for
the top of each monitoring hole, observation well, and the staff gage. Figure 2 shows the
location of the monitoring devices. We completed our initial groundwater measurements
on April 27, 2006. Subsequent measurements were completed on May 4, 2006, May 1 I,
2006, and May 18, 2006. An additional staff gage reading was made on May 16, 2006.
Table 1 summarizes data collected. Figure 3 graphically illustrates groundwater levels.
Observations
At the time of our initial measurements, the Rising Sun Ditch (RSD) was not in
operation. Several of the monitoring holes were observed to be dry at the time of our