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V • RESOURCE <br /> `df HYDROGEOLOGIC <br /> SFRVICFS <br /> Table 1. Proposed Monitoring Well Specifications(Construction Guidelines). <br /> GCC Rio Grande Pueblo Plant 2021 Proposed Monitoring Well Specifications <br /> Estimated <br /> Estimated Estimated Estimated <br /> Estimated silica Bentonite Estimated <br /> Well Estimated Screen Screen Silica Sand Annular <br /> Proposed Screen Sand Seal Number of <br /> Completion Target Well Type Diameter Depth Interval Slot Size Filter Pack Seal(Chips) <br /> (inches) (ftbgs) Depth (inches) <br /> Wells Length Filter Length Length(Pellets) Casing <br /> (ftbgs) (ft) Pack Size (ft) Length (ft) Centralizers <br /> ft <br /> MW-9 Fort Hayes Limestone Bedrock Monitoring Well 2 40 10-40 1 30 0.02 1 10-20 33 5 5 1 4 <br /> MW-10 Codell Sandstone Bedrock Monitoring Well 2 55 40-55 15 0.02 10-20 18 5 35 5 <br /> MW-11 Fort Hayes Limestone Bedrock Monitoring Well 2 60 30.60 30 0.02 10-20 33 5 25 5 <br /> MW-12 Codell Sandstone Bedrock Monitoring Well 2 75 60-75 15 0.02 10-20 18 5 55 6 <br /> MW-13 Fort Hayes Limestone Bedrock Monitoring Well 2 120 90-120 30 0.02 10-20 33 5 85 8 <br /> MW-14 Codell Sandstone Bedrock Monitoring Well 2 150 125-150 25 0.02 10-20 28 5 120 30 <br /> MW-15 Unconsolidated Colluvium Monitoring Well 2 20 5-20 15 0.01 20-40 16 5 0 2 <br /> Detailed Specifications-Bedrock Monitoring Wells <br /> Drilling by air rotary with 5'cuttings samples staged for hydrogeologist documentation <br /> 3/8"bentonite chips set at bottom of hole(poured)for any incidental/exploratory over-drill past target well screen interval(have 5 extra bags Hole Plug) <br /> PVC environmental well casing to be schedule 40,flush-joint threaded,10'length pieces <br /> PVC environmental screen to be schedule 40,0.020"machined slot,flush-joint threaded,5'and 10'length pieces <br /> PVC environmental well casing end cap,flush-joint threaded installed at bottom of well <br /> SS bow centralizers to be installed on top&bottom of screen and on casing every 20'to surface <br /> Filter pack to be monitoring well silica sand size 10-20,installed via tremie pipe,depth tagging as installed <br /> Bentonite seal to be 1/4"or 3/8"bentonite pellets(5-gal pail),installed via tremie pipe,hydrated at time of installation with potable water <br /> Annular seal to be 3/8"bentonite chips installed by surface pour,hydrated at time of installation with potable water <br /> 4"X 5'lockable steel well protector installed with"MW-9","MW-10","MW-11","MW-12","MW-13",or"MW-14"well ID welded to lid or side,no paint <br /> TX 3'X 4"concrete wellhead pad with(4)4"X 6'steel protective posts cemented in place at each corner,3'stick-up,no paint <br /> Standard 2"environmental J-plug provided for top of 2"casing <br /> Detailed Specifications-Colluvial/Overburden Monitoring Well <br /> Borehole to be drilled at minimum 6-3/8"diameter from surface to base of colluvium(bedrock refusal) <br /> Drilling by hollow-stem augers with all cuttings samples staged for hydrogeologist documentation,well to be constructed within augers <br /> PVC environmental well casing to be 2"schedule 40,flush-joint threaded <br /> PVC environmental screen to be 2"schedule 40,0.010"machine slot,flush-joint threaded <br /> PVC environmental well casing 2"schedule 40 end cap,flush-joint threaded installed at bottom of well <br /> SS bow centralizer to be installed on bottom and top of screen section(minimum quantity 2) <br /> Filter pack to be monitoring well silica sand size 20-40,depth tagging as installed <br /> Bentonite seal/annular seal to be 1/4"or 3/8"bentonite pellets installed by surface pour,hydrated at time of installation with potable water <br /> 4"X S'lockable steel well protector installed with well ID"MW-15"welded to lid or side,no paint <br /> TX 3'X 4"concrete wellhead pad with(4)4"X 6'steel protective posts cemented in place at each corner,3'stick-up,no paint <br /> Standard 2"environmental J-plug provided for top of 2"casing <br /> General Project Specifications <br /> Environmental monitoring well installations-standard pre-job rig&drill pipe decontamination required,but no de-can between locations <br /> Environmental grade thread compounds to be NSF 60 certified(i.e.Jet-Lube Well-Guard)-no metallic or petroleum compounds on drill pipe or well materials <br /> All well installation materials(casing,screen,centralizers,filter pack,bentonite,dope)to meet NSF 60 certification <br /> All PVC well screen/casing materials to be provided new and factory boxed/bagged to site,handling with new cotton/nitrile gloves only <br /> GCC Rio GRANDE,INC.PUEBLO PLANT <br /> 2021 MONITORING WELL INSTALLATION PROGRAM WORK PLAN <br /> 11 <br />