GENERAL49718

• Permit No: M1980110
• IBM Index Class Name: General Documents
• Doc Date: 6/21/1985
• Doc Name: HENDERSON DEVELOPMENT PIT
• From: QUATERNARY
• To: MLR
• Media Type: D
• Archive: No

•
Quaternary
Environmental Consulting
iii iiiiiiiiiiiu iii
June 19, 1985
Mr. Peter V. O'Connor
Reclamation Specialist
Mined Land Reclamation
1313 Sherman Street, Room 423
Denver, Colorado 80203
Re: Henderson Development Pit
File: 80-110
Dear Peter:
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! u N 21 1985
MINED LAND
RECLAMATION DIVISION
Thank you for taking the time to visit the Henderson Development pit
again this past week. I believe that we have now resolved most of the
issues that the division had raised regarding this site. This letter
supersedes the previous information submitted and reflects a more accurate
assessment of the volume and quality of soil stockpiled and available for
reclamation. We have sampled the piles present on site and have had the
soils lab at Colorado State University complete the analytical work.
Attached is a copy of the data. The sample points are keyed to a
sketch map of the permit area. I believe that it was evident from the
various exposures of the soil profile around the site viewed during our
visit that most of the material in stockpiles salvaged is similar to the
undisturbed soils and control sample. The differences in the amount of
gravel incorporated in these piles can be attributed largely to the lateral
and vertical variations in texture as apparent in the banks exposed on site.
As noted from the CSU data, these soils sampled are generally clay
rich, even from the piles where it was apparent that a considerable volume
of aggregate was present in the material. Except for a relative deficiency
of nitrogen in some samples, all other nutrients are shown to be adequate
in the samples tested. Recommendations range from no additional treatment
to some additions of nitrogen needed.
Volume of Soil Available
The approved MLRB permit requires that fr
be replaced on areas to be revegetated. Ala
the site, leaving a maximum of about 10 acres
for setbacks and undisturbed areas). Using a
the volume necessary for reclamation is about
volume in piles on site has now been estimated
the sketch map for locations):
om 6-12 inches of topsoil
ke will be formed on most of
to be reclaimed (allowing
mean depth of 8-9 inches,
10,756-12,100 yrd.3. The
to be as follows (refer to
1210 South Park Drive, Monument, Colorado 80132 [phone]
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