HYDRO22093

• Permit No: M1977573
• IBM Index Class Name: Hydrology
• Doc Date: 3/8/2007
• Doc Name: Comments
• From: OSE-Water Div 2
• To: Transit Mix Concrete
• Media Type: D
• Archive: No

- . L YMAN
_
H ENN
I NC -
ENGINEERING $OLUTIONS FROM THE GROUND DOWN
7 February 2006
File No. 103080-000
TO: Office of the State Engineer -Division of Water Resources
Mr. William Tyner, Assisitant Division Engineer, Division 2
C: Transit Mix Concrete
Jerry Hermans
FROM: Lyman Henn Inc.
Sean Harvey
SUBJECT: 90-Day Initial Liner Test
Transit Mix of Pueblo, West Pueblo Gravel Mine
Pueblo, Colorado
Post construction testing of the water storage reservoir at the subject property will be conducted in
accordance with the "State Engineer Guidelines for Lining Criteria for Gravel Pits," dated August 1999.
Lyman Henn, Inc. (Lyman Henn) has prepared this memorandutYt to present a summary of construction
methods, allowable seepage rates, and a detailed test work plan. This memo is being submitted to the
State's Division Engineer for review and approval of the detailed work plan presented for performing the
90-day Initial Liner Test.
The 90-day liner test will determine if the compacted clay embankment will meet performance standards
defined by the State Engineer when the reservoir is completely dewatered, thereby releasing Transmit
Mix of Pueblo (Transit Mix) of augmentation responsibilities for the gravel pit. The testing consists of
performing a 90-day liner test to demonstrate the system compliance with the State Engineer's standards.
The demonstration is achieved by carefully determining the water balance at the pii by measuring and
monitoring the inflows (precipitation and groundwater) and outflows (evaporation and discharge water).
Typically, the Office of the State Engineer (SEO) requires the testing plan be approved prior to
performing the test.
CONSTRUCTION SUMMARY
Transit Mix has constructed a compacted embankment at the West Pueblo Grave] Mine, North Parcel.
The gravel mine is located along State Highway 96, approximately 2 miles west of State Highway 45 in
the Arkansas River floodplain. Construction of the embankment began in March 1998 and concluded in
January 2006. Construction was not continuous during this period. The embankment was constructed to
full height (up to 26 feet) at an approximately 4:1 (horizontal:vertical) slope. The embankment was
110 16th Su-eet, Suite 900 -Denver, CO 80202-5202 -Tel: [phone] -Fax: [phone] - wvvw.LymanHenn.com
Geotechnical,Tunneling and Construction Services