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COLORADO DEPARTMENT OF HEALTH
Richard D. Lamm
jit- r3r` )F Thomas M.Vernon, M.D.
Governor 1876 Executive Director
July 27 1984 MU COMITY �A M1sst wEAS
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JUL3 01984 ;!
Weld County Commissioners ILI
Box C GREELE C4SLV:
Greeley, Colorado 80632
Gentlemen:
On July 19, and 24, 1984, Mr. Scott Winters of this Division performed an
inspection of the Road 54 E-Vap Project in Weld County, Colorado. The purpose
of this inspection was to assess the condition of the excavated pond surface
prior to placement of any pond liner. Our inspection revealed that while some
areas of the pond bottom were composed of a silty, sands, the majority of the
area was composed of sandy clays or weathered claystone. According to Mr.
Pankonin, a site inspector with Norton, Underwood and Lamb, the unsuitable
silty, sands were to he over-excavated by two feet and replaced with compacted
liner material.
Our inspector, Mr. Winters, does have concern that the contractor ensure
that only the more suitable soils with appropriate clay contents and physical
properties as approved by the quality control consultant, Norton, Underwood
and Lamb be used for liner materials. These concerns have been expressed to
Norton, Underwood and Lamb. We request that copies of the as-built plans and
specifications and the quality control consultants inspection reports be
provided to this office within 60 days after completion of construction of
each evaporation unit.
Furthermore, precautionary measures should be taken to ensure that the
pond liners do not dry out and crack prior to the placement of wastes.
Respectfully,
Kenneth L. Waesche
Director
Waste Managemente Division
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cc : Weld County Health
Norton, Underwood and Lamb
Arvin Martinson
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840686
(VI? PAC669
4210 EAST 11TH AVENUE DENVER,COLORADO 80220 PHONE (303) 320-8333
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