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LkR-A) 51L►ER WINES <br /> Response: For the reasons presented in the item 4 response, OSMI proposes Pond 3 i�, best <br /> monitored by the existing requirements under permit C'O0000003 along v\ith visual monitoring <br /> for leaks, \\here the presence of flowing water during dry conditions indicates a leak. <br /> 3. The propovc(llocation ol'Gff'-4R is cliStunt un(l clown aradieniftoin I)on(l3 than Git'-4 thus it <br /> would not isolate the hater(llialill' iwPacts froin the Passive treatment sl'stein alone. Therefore, <br /> it is inferred that GIf'-41? ►rotthl he a generic groundwater monitoring ►►'ell fur the entire <br /> RevenliC .lpinc silo. Please provide the justification as to wh-1, GIf-4R is being proposed to <br /> replace Gff--1, dcsl)itc being a well with a s'eeiningll'cllllerenll)11T1)os . <br /> Response: OSMI no longer proposes a replacement well for GW-4. <br /> 6. The prol)osecl Gff 41? is a relVaceinenl EPF. Pursuant to Rlile 6.4 21(7) Prior to approval the <br /> Division will require the proposed well construction schematics. bell location, Chilling inethod4, <br /> cuttings handling and circulation grater handling. <br /> Response: As discussed in the responses to items 3, 4, and 5, OSMI no longer proposes a <br /> replacement well GW'-4R. <br /> Contours on .-Elul) 1 suggest that the proposed GIf-41? will he located at aly)roxinialeh. the <br /> saute elevation as GIf'-4 gild will hi,trice the depth. Please provide lustijicalion of the <br /> construction(10aii(S of'lhcl)roposed Gff'-4R. The justification should address hilt is not limited to <br /> the rcasoning for the incrcased dcl)th, purpose behind the use of a packer'bentonile plug and the <br /> estimaled de1)th to grounelwater contact. <br /> Response: As discussed in the responses to items 3. 4, 5, and 6 OSMI no longer proposes a <br /> replacement well GW-4R. <br /> 8. In rerbal discussions prior to the stibnlission of'TR-1?, a fault,drill rig was initially sitspecled <br /> to he the source of the contamination of Gff'-4 What ineasures frill he taken to miniini.:e the <br /> chance of containinution when constructing the proposed Gff'-4R. <br /> Response: Prior to understanding the historic machine shop activity associated with the area, <br /> initial discussions focused on the possibility a faulty drill rig had released a small amount of <br /> organics. When attempts to purge the "ell \\ere unsuccessful. OSMI came to believe a larger <br /> amount of organics were present and began researching other possible causes as a large volume <br /> organics being accidentally spilled into the \\ell bore \vas unlikely. For fiiture monitoring \\ell <br /> drilling OSMI will ensure the driller is experienced "ith monitoring wells and the "ell drilling <br /> will be observed by environmental staff or consultants for irregularities. None-the-less, as <br /> discussed in items 3 through 7. OSMI v\ithdraws the proposal for GW-4R. <br /> 5I <br />