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features in a readable fornt. Revised daps of 24" x 3G" or lamer may be recommended. <br />Please provide. PU}.I.Y' :1DDK1•:SS1?D <br />4. The ExhiMt F-Reclamation Plan 'vtaps sho\v the "approximate" location of the proposed <br />slurry \vall. The plans, as presented, arc unacceptable fir approval. fhe plans will need to <br />he revise) to show the definite, exact location of the slurry wall, or the applic:uu will need <br />to commit in writing (and specify on the revised maps) the minimum setback distance. shat <br />the slum' wall will be installed fiom the permit boundary. It is also necessary for the <br />applic:utt to clearly define in writing (ttnd specify on the rovised maps) the minimum <br />setback distance the slurry wall will he from the top uP north bank of Sl Vrain ('reek. <br />Please respond. FULLY ADDRESSEiD <br />5. The "Supplemental Geotechnical Engineering Report" prepared by Terrtcon indicates <br />that the sluRV cut-n R' walls should be "kevcd" or "socketed" into the relatively <br />impermeable comprtent;'intact claystonc or sandstone bairock to reduce groundwater <br />seepage. TEu report titrthur states that supplemental coring and packer pemteahility testing <br />in thr area of Horing Numbers 4S, 47, & 4R indicated that the upper 5 to 10 lief of the <br />sandstone layer was moderately to severely fractured and that "keying" or "sockcting" into <br />this h'pe of sandstone bedrock could result in excessive seepage losses, and that deeper <br />keyways for the slurry cut-otl"walls will likely he required in this area. Further, the upper <br />1 l0 2 feet of claystonc exhibited mot}crate \vcathering fracturing and should not he <br />considered compctenuintac[ hecrock. In response to these observations, the Division <br />reyucsts Ih:u the applicant submit a plan or proposal of constmction specifications that <br />provides specific measures to he tmplementcd during \anutg site geologic conditions to <br />aSSnre that the SIURV \Vall will be adeyuatcly keyed into competent halmck throughout the <br />entire perimeter of the proposed installation, and minimize the potential litr excessive <br />seepage losses once constmction of ifu slurry wall is completed. Please provide. <br />;~DDI110NA1. IN}~OR'~1:111UN RF.QI'IRED -SEE SECOND :1DI.QIJA('Y' Rf•:~'IPW <br />fCE~t #2 IN ~tE~tO FRU~I TY)M 1CHRfiINE:R <br />6. "I-he "Supplemental Geotecitnical Engineering Rerwrt" prepared by Terracon indicates <br />that the possibility of groundwater fluctuations should he considered +vhen developing <br />design and construction plans for the slurry wall installation, and that fluctuations in <br />groundwater levels can best he detcmtincd by imp)emcntation of a groundwater <br />monitoring plan. Please state at7imtutivcly \ahether such a groundwater monitoring plan <br />will he developed and implenrented as part of the slurry wall installation project. I1' yes, <br />please provide the details of the groundwater monitoring plan, such as location of <br />numiloring stations, lrcyucncy of monitoring, design of monitoring stations, length of <br />proposed monitoring, and purpose of groundwater data collected. Plcasc respond. <br />ADDII'IONAI. INFOR\1AfION RI'Ql'IRE:D • SF.E SECOND ADEQU:1('Y RriVIEW <br />fl'E'~I r1' IN ~1Eh10 FKUM I'O~I SCHRr:INr[R <br />7, In conformance with Rule 6.4.5, please provide engineering details and construction <br />specifications till the shcctpilc wall shown in the proposed swimming area on the Terracon <br />reclamanun plan maps. FI'L.Ll' ADDR}iSSED <br />