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<br />~ <br />MATERIALS TESTING SERVICE <br /> <br />CONCLUSION <br /> <br />The -Idaho. Springs. Water- Retention Structure --is susceptible to <br /> <br />an-extreme seepage problem when the water retained behind the <br /> <br />-structure reaches the.overflow 9pillway height. The saturation <br /> <br />. of_the."Boil -under=the abovecondition.creates a free-flow_ state <br /> <br />for the-soil, which with excessive pressure could cause the <br /> <br />structure to move. A decrease in_the high flow net of water <br /> <br />seepa<;ye-c"'WOl:rl:lbha Veo,ca-- resuitant,,-cdecrease ,,;in -,damcCne igh"b,"--.thereby,=. c-- - <br /> <br />requiring-tha t-'addi:tiona'lo:-1: i-I :l-<ma teri-aLbe '-used--:in' :main taining ~-- <br /> <br />the --llresene~herght---of-the~-'Struct-uref,-=-" Add-itiona'];o, c-Ri-p""Rap":ma te- <br /> <br />rial on the downstream side of the structure would provide soil <br /> <br />'-- <br /> <br />stability _-and--aid_-the--dewatering--effort;- - The 'soil material <br /> <br />>.'."' <br /> <br />used i.n-'constructi-on--does _ not~-c6ntain ,ampLe- __plastic-- .fines, thus <br /> <br />the-water has -forced or. flushed-the -original- -fines from-t-he <br /> <br />soil matrix. In repair of the structure, use of an excessively <br /> <br />fine and highly plastic soil is recommended. <br /> <br />I <br /> <br />ENGINEERS <br /> <br />-1- <br />