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<br />&- rORT MORGAIf, COLO. TIMES. WEDNESO~Y, APRIL 5. 1973
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<br />Safe Dam Possible
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<br />(CllIItlDlledFromPaI!Il"
<br />blck to the doWnstream to the
<br />dam
<br />Tbematcrial isdl!ferent from
<br />the Telon dam, but basically
<br />the pattern was the same ...:
<br />badly fractured rhyllte rock
<br />allowed leakage to the down-
<br />stream toe, althoogh it was
<br />thought grou.t had sealed the
<br />leab. The dam coUaJXIcd from
<br />the downstream side.
<br />11ie Narrows dam mlght need
<br />e:ttension of the l1uny trench
<br />~peodlng on the, extent . of
<br />p;lrousmaterlal.A1so.tressure
<br />teller wells', to keep water
<br />~1I6LD'e from becomi~ ex-
<br />cessive in the doWnltrtam toe
<br />a~ of the dam and a drainase
<br />blankel on the downltream toe
<br />to allow waler out without
<br />learing up the downstream toe
<br />might be needed.
<br />Geology well logs near the
<br />dam, Kuiper noted, supported
<br />the concern about' pervIous
<br />material with 2,500 to 3,000
<br />gallons a minute coming
<br />~gh Indicating, he said,
<br />pretty damn porous"
<br />matenal.
<br />All of this led to a memo to
<br />Harris Sherman, director of the
<br />state's Department of Natural
<br />Rescurces, on the concerns of
<br />Kuiper's departmer1t.
<br />Members of the Regional
<br />Land~wnfl's Group, the op-
<br />PO/Iltlon coalition wilh the
<br />pending lawsuit, obtained a
<br />copy of t~1 memo when they
<br />asked for II. The memo, Kuiper
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<br />said, wu public record: ''They
<br />can come in and have a copy or
<br />anythng. in thi6 office."
<br />Kuiper was asked at a
<br />meeting of the review panel or
<br />geolDglcal and engineering
<br />people if he had queStl.on5, and
<br />he asked the experts if they
<br />would like to walt for the
<br />transient study. They indicated
<br />they would The report,
<br />however, wu due too soon.
<br />His quest:lorm al80 addresSed
<br />p:lrosityofthematerlal, and the
<br />panel Indicated a safe dam
<br />could be built. However, oo;t
<br />was unknown, as the slurry
<br />trench might have to be ex-
<br />tended and the anuvium Is up to
<br />2SO feet deep lioulh of the dam.
<br />He had no argument with the
<br />consultants, he said, but they
<br />did not. specify how far the
<br />safety measures would have to
<br />1>, the apparent COlQ'Se is to
<br />start building flrst, then decide.
<br />"I'd like to know what It's
<br />golng.to cost," he laid.
<br />(Ne'll: W.ler supply.)
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<br />The OIesapeake Bay is 180
<br />miles Ion8, and COYerI 155
<br />miles In Maryland and 70 milef1
<br />in Virginia. III width ranges
<br />from2.l5lOZlmiles.
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