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I R-11 51c«R AJAES <br /> 9 Commit to witting(in Initi(il complete h'v(hwcarbon(lnah'lical spite to GII-4R once complcic(l. <br /> .-lull if 1"esults in(I!e(ile h (b-ocui'bom c•onllmic to swnple for those COn.Stitll(nt.S' (IIiU!'lePll' <br /> Response: As discussed in the responses to items 3 through 8. OSMI no longer proposes a <br /> replacement «ell GNV-4R. <br /> IU Section 41 ('haructel'i_(itiOna17cl.tlnnitorn7(1T'!(1nInI)IO11tll(itiolI stuleS1/1111OS.1H's <br /> volitntcrrl,cffilrl mul' inchlcic three con(litions to 1tw1hcr characlerize the pollittant. Also, vubcil <br /> (lisc•incions hhhC(rte(1 ci thir(I p(irt. constihunl lroitkl be reluine(l to complete the charac•tci-Lulion <br /> of the contaminant. Please Com snit to cin(1 provitle the Divivion wilh a(letuile(1 plan timl <br /> eslitnatc(l little of complelion.f(m a complete chai-m-teri_(ition of the co tilt minanl milfrcient <br /> enough to 0071i i' the solll"ce, extent, composition un(I polential impacts of the cont(oninunt <br /> cliscovere(I in GIt'-4. <br /> Response: OSh11 Contracted Geosyntec. see recommendations in Attachment 6. <br /> 11. Given that ORO's werc (1etc'cIe(1 rn.SII"-» Will(i(I(lltlOn(il ltpgi'a(leint an(I clolt'ngi•u(llent <br /> ccrtnpling lot- ORO'S he con(luclecl US punt of the cltuructcrrcllrnn 10 he 0)17114etccl hi (! third <br /> pcn•t),consultant, if'.so please in(licute which locutions will be suniple(l' <br /> Response: No additional sampling for DRO is proposed in Snetfels Creek. because DRO is not a <br /> regulated constituent, no sheen has been observed at SW-22, and GW-4 analytical results are <br /> belo\� regulator} thresholds in GW-4. <br /> 12. SiI-22 has been selecte(l.for'a tempor(rl'v sutlitce lrulei,sampling point II"ill this become (i <br /> permanent S'ur.f(!c•e sampling point inoving.furli,arcl" <br /> Response: While OSMI has an interest in monitoring at SW-22, it is not being proposed as a <br /> permanent station at this time. <br /> 13. No c(nnmili ew lt'a.S nimle,fol•InOnthli,scinlpling, unclh'sis an(I l'eporting(is i'Cquire(I bl'the <br /> D/l'lS1011 I'eb/'l!(l1.1' 1, 021 IC'IIe1' PICus'e C'01771111I to 111 0 1 7 111E S'a/11phn,(Uf tit (! 1711171n71fn1 (III-4, <br /> SI4-2? (110(;R-4R (once completc(l) until the problem can ci(lequatell' he ucl(Iresse(l. <br /> Response: OSMI has continued visually contingent monitoring at SW-22 monthly, kith no sheen <br /> observed. GW-4 \gas sampled for a broad range of organics and VOCs (Attachments 2, 3, and 4). <br /> results found no regulated constituent concentrations above regulator} thresholds in Regulation <br /> 41 The Busic Stanclarcls lot- Giwin cl II'ulcr. G\k'-4R is "ithdrawl. OSMI proposes to plug and <br /> abandon GW-4 and cease visually contingent monitoring at S\A'-22. <br /> Please do not hesitate to call me N\ith concerns or questions at 970-325-9830. <br /> 61 <br />