AG 1998 09 21 - Laserfiche WebLink

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ILL Memorandum DATE: Mamh 31, lgg7 TO: Stew Little FROM: Bitt Co~hmn RE: Darns It Laka Co~¢ord & Frank Nske Park CC: Tim Lowder, PE Frank C. Cocldnor,, PE LAK~ CONCO~O As you Ire aware ~ am tw~ major concerns at Lake Cor,;ord. The rmopaOo along the toe of the clam must be collected In a drainage flekl alld the broken areas of the lower poRIon of the spillway must be repaired. I have ~mtacted, an engineering firm in ~, N. C. to asrdst me with the engineering on the project On Mamh 19, lg97 BoMoomftekl (FrankC. Co¢fl~o~ & A~aoclate~) ed Irn~.withTIm Lerner, Jim Leumas (Dam Safety Engl~ and Brian Moore (Moomsville office of the Land Quality Section) at Like Concord to dl~3u# the~e two oone. em=. We are In agree'met ~ to the proper approach requlrad to resolve the ~aage pmlNem. Several ldea~ wine e~ regardk~g the repair to the extended spillway, va~ng from d~ng no~lng to a compk~ new concrete IAmctum. We were able to c<~vlnce the Dam SM1Ry er~llneem th~ tt~ Im~illal~ cd a toewall at the end o! the eM~lded spillway shou}d suffme for many ~ara. This will be an expenr~ive job, but it isthe mo~t l~omlcal method. In addition to Ut]l ~ EWIll b/ necasr.~y to bmek up the large pieces of broken ¢Ollcmte0 Idd moI~ Iai'ge Up-rap and di~ltlxlte this broken concta~ and tip-rap around the Ipllllng bi.in ama in ruder to dlio~ the ~ ~ downstream. The ~ cosl for the ..r~, ~o11~, ~a'uctuml and cml m~linee~ing ~ inotuding Inr~ Is $9,S00.00. U,~I the Itudlel are complete It h~ Impolalbte to ~ you with In Iccurate col~ll't~-'Iio~ repair requirements. I beliew that II rea~c~abte figure for the repaJm at Lake Concord will be $00.500 plus the survey and engineering. Th~ will be · '~i budget estimate of $70.000. FRANK L~KI~ PARY~ The cost er, tlmate of the repatra to thla dam ~e~cern me rn~e than Lake Conoor~ We must complele a !tc~,~ study of the drainage basin to clatemflrm the Nzes of the lxopos~l ~p,L,,T,n and the spillway This study rn~y Indicate the neces~ty for adding ~ddltiom~l fmelx~'d to the dam. The cmreet water level doetm't allow much ~orage be{om water ~ the dam. Th~ M~age can be increased by ·riding height to the dam ~ by lowering ~he water level. Adding height will bo ve~7 expe~v~ ~onekterlng the ~gth el the clam, I~t e~de, th3g ~'u~ure~ around ~ ~ rr~y eliminate ~,e opportun~y tO k3wer the wate~ level. A de~rmfnaflon on th~s cannot be mede un~l a study o~ t~e ex~ng eme~ency spillway ~ complete.