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features in a readable form. Keviscd ~1aps of 24" x 3ti" or larger may be recommended. <br />Please pmvide. L~IILLY ADDKESSED <br />4. 1'he fi+chibit F-Kcxlamation Plan Maps show the "approxinuuc" loruion of the proposed <br />slum wall. The plans, as presented, arc unacceptable fix approval. The plans will need to <br />he rcviscd to show the definite, exact location of the slurry wall, ar the applicant well Hied <br />to commit in writing (and specify on the revised maps) the minimum setback distance that <br />the slurry wall will he installed from the pcmtit boundary. It is also necessary for the <br />applicant to clearly define in writing land specify on the rcviscd maps) the minimum <br />setback distance the slum wall will be ti~om the top of north bank of SI Vrain Creek. <br />Please respond. FL~1_I_\' ADDKESSI'D <br />5. The "Supplemental Geotechnical Engineering Report" prepared by 'ferracon indicates <br />that the slurry cut-o1T IVeIIs should he "keyed" or "socketed" into the relatively <br />impernreabli competent;'intact claysame or sandstone bedmck to reduce groundwater <br />seepage. The report further states that supplemental coring and packer permeability testing <br />in the area of Boring Numbers d5, 47, fi dR indicated that the upper 5 to I(i feet ol'the <br />sandstone layer was nuxicratcly to severely fractured and that "keying" or "sockrting" rota <br />this type of sandstone bedrock could result in cxa~ssive seepage losses, and that deeper <br />keyways for the slurry cut-oll-walls will likeh• he rcyuired in this area. Further, the upper <br />I to 2 feet of claystone exhibited moderate wcathcring~fracturing and should not be <br />considered compctcnvintact becrock. In rcspansc to these ohseroatians, the Division <br />rcyuests that the applicant submit a plan or proposal of constmitian specifications that <br />provides specific measures to be implemented during varying site geologic c•onditrans to <br />assure that the slurry wall will Ix adeyuatel+" keyed into competent bedrock throughout the <br />entire perimeter of the proposed fnslall;dion. and minimrrc the potential for excessive <br />seepage losses once construction of the slung wall is completed. Plcasc provide. <br />ADDI"I IONAL INPOK\4A7"ION KFQt;IKFD • SI;E: Sf:C'OND AUIiQI!AC'}' KI'_VIti.W <br />ITEIv1 u2 IN Mli1W0 FRO~1 TOM S('IIRI:INL'R <br />6. The "Supplcmcnlal Gcotechnical Engineering Report" prepared by 'Icrracon indicates <br />that the possihilit_y of groundwater Iluctuations should Ek considered whin developing <br />dcsiSRr and amstructiun plains for Brc slurry wall installation, and that Iluctuations in <br />groundwater levels can hest be ditcnnined by implementation of a groundwater <br />monitoring plan. Plcasi state aflimraticcly ++'hethcr such a ~roundwatcr numritorins; plan <br />will be developed and implemented as part of the slurr}• wall installation project. If yes, <br />please provide the details of the ground++:rtir monitoring plan, such as location of <br />monitoring stations, frcyucncy of munnoring, design of monitoring stations, length of <br />proposed monitoring, and purpose of groundwater data collc~tcd. Please respond. <br />r1DDI110Nr11. IN'FUKM:\fION KEQI'IKf.D • SEG SE('OND ADF•Ol4\Cl" KF.VIf.W <br />ffEb1 /i2 I\ \"11~iA1O PKO~~1 I'l)~A1 S('HKI!IV'f{K <br />7. !n cuntonnance wrth Kule G.a.i, pl~asr provide engineering details and construction <br />specifications tier the sheetpilc wall shown rn the praposcd swimming area on the 1'erracan <br />reclamation plan maps. FL!LL.\' ADDKIiSSED <br />