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^ ^ I Meeting these ARARs and, by extension, achieving 2 RAOs, can be accomplished by reducing concentrations 3 (or activities) of contaminants to remediation goal 4 levels or by eliminating potential exposure pathways. 5 Contaminant-specific, numeric soil PROs for direct 6 exposure and protection of groundwater and the 7 Columbia River are typically presented as 8 concentration (mg/kg) or activities (pCi/g). 9 SUMMARY OF REMEDIAL ALTERNATIVES 10 The 221-U Facility final feasibility study addressed llI five alternatives for interim-remedial action. The 12 Phase I feasibility study Identified two other 13 alternatives that were not recommended for further 14 study. These were Alternatives 2 (Decontaminate and 15 Leave in Place) and S(Close in Place - Standing 16 Structure). Only Alteraatives 0 (as a baseline), 1. 3.4. 1^ and 6 were carried forward into the final feasibility 1 study and this Proposed Plan. 19 These alternatives are as follows: 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 3 3 3 4 41 4 4 4 4 48 49 • Alternative 0: No Action • Alternative 1: Full Removal and Disposal • Alternalive 3; Entombment with Internal Waste Disposal • Alternative 4: Entombment with InternaVExternal Waste Disposal • Alternative 6: Close in Place - Collapsed Structure. With the exception of the No Action baseline (Alternative 0), the remaining active alternatives consist of common elements to achieve the 221-U Facility RAOs. The common elements include components within the response action, in.aitutional rnntrols. and, for Alternatives 3, 4, and 6, a u a barrier nost-elosure monitoring. These are summarized in Table 4. The foomrint of the surface Alternative 0: No Action Alternalive DOFJRl.2001-29 Draft D RedlindStrikeout D 50 The "National Oil and Nazardous Subsunees103 SI Contingency Plan" (NCP) (40 CFR 300) requires that 52 a No Action alternative be evaluated as a baseline for 53 comparison with other remedial alternatives. 54 Alternative 0 represents a situation where no legal SS restricbons, access controls, or active remedial 56 measures are applied to the site. No Action implies 57 "walking away" from the 221-U Facility and allowing S8 the wastes to remain in their current configuration, 59 affected otily by natural processes and without benefit 60 of surveillance or maintenance acdvities. Selecting 61 Ahernative 0 as the preferred alternative would require 62 that the 221-U Facility poses no unacceptable threat to 63 human health or the environment. 64 Alternatlve 1: Full Removal and Disposal 65 In this alternative, the 221-U Facility structure and 66 contents would be decontaminated and demolished. 67 Demolition of the structure would involve cutting it 68 into large blocks. Structural material, facility contents. 69 and associated soil above tieaoW>-leve{R-yj,l^y3gQ 70 st,indards would be disposed at the ERDF. An 71 estimated 78,OOD ms (102,000 yd) of debris and soil 72 would be disposed to the ERDF. Most wastes would 73 be expected to meet the criteria established for ERDF 74 waste acceptance. If the ERDF waste acceptance 75 criteria cannot be achieved, waste treatment or 76 disposal at an offsite disposal facility would be 77 required. Material to be disposed of would be 78 segregated, evaluated for reuse or recycle, and 79 packaged and shipped to the disposal facility. The 80 demolition excavation would then be backfilled to 81 surrounding grade, and the disturbed area would be 82 reseeded or otherwise resurfaced consistent with future 83 land-use decisions. Institutional controls to mainuin 84 industrial land use would be required if unrestricted 85 cleanup levels are not achieved by this alternative. 86 Alternative 3: Entombment with Internal 87 Waste Disposal 88 This alternative would involve decontimination of the 89 221-U Facility in preparation for intemal placement of 90 wastes from other CERCLA actions on the Flanford 91 <strong>Site</strong>. Approximately 3A00 ms (4A00 yds) of exi.sting 92 contaminated equipment from the canyon eperating 93 dcck would be reduced in size and volume and then 94 disposed to process cells of the facility. Approximately 95 10.100 ms (13.200 yds) of waste from other CERCLA 96 actions would also be disposed in available remaining 97 spaces within the 221-U Facility, resulting in a total 98 waste disposal volume of 13500 tns (17.600 yd'). 99 These wastes would be grouted to minimize the 100 potential for void spaces. A eross section of the 101 interior waste fill plan under Alternative 3 is shown in 102 Figure 4. 11
fO'^, ^ 1 2 3 4 5 6 7 8 9 10 11 12 13 14 l 1 17 18 19 20 Ii' Element DOF/RI..2001-29 Draft D RedlinelStrikeoam B Tabk 4. Common Elements of the Active Remedial Alternatives for the 221•U Facility. Desertp0oa Respaue The response action is the pdwry elemem of the remedial action alternstive. Response actions determined to be appmpriaWe Action for the 221-U Facility include removd of eontanrinams ( Alletnmive 1), containment of eontanunants In The existing swcture with Internal waste disposal ( Ahernative 3). eantainmeat of contaminants In the existing suueave with Internal and external wane disposal (Alternative q, and containmem of emnaminaus in a panially demolished strocturo (Aherna6ve 6). All alternatives will require eommon steps to stabilize the facility. Key eonunoa steps include instaltmian of a new toof rover; gtouting of concretesocased tik sewer pipe and ventilatwo Wnnel; siu reduction and dismantiing of equipment currently Yeingitxedon the canyon ep«eNepdock; fuing eonuminanon on the canyon walls, tlaor. roof. aells, hot pipe trenck. and equipmeon D&D of The outer 22.9 m (7! 0) of the railroad tunnel and wing wal Iss and disposition of the 276U Solvent Recovery Facility, the 271-U lHfn:e Bu)iding, and front and «ar stairs of the 221-U Facility. AMaadve I involves complete sowce tenavat, tceument as necessary, and disposal at an onshe eaginmed facility such as the tRDF. 'Re cootaimrcm rnponse aetiem inchde elomae of drc unit with an enginared muni-layered sudace eaviroomentaf eap. tustnu6unal lastinaioml mnools sre sn imegnl pon of aU tespame saimc 71lese comok would be tequirod dutiog and after oomplcte aeute Cantrak nanovd (Aiumnive p nemwe Itut twre land use n^milm ansWem widt dte lodumial sceoatio. Fvomaa)mne^ altnnatives, more robust Innawiooal controls would be required to emuro that environmrnul caps are poperty maimaiaed Methods of ptecluding uointeotioml acspassing and eonuoning access to waste sites eould Include sigm, enuyeooud. exeavation pnndu, anificW at nmtmal barriets, and active naveiUaece. legd testriiaions on the inc of land and groundwater would be (nqoscd (ey hdption,we0a88ag)7irkgnlrestdcdomwouidbeet@ c t i veifeonaulofasheistruufaredffanDOEloanogrrpnty. Monitoring ThismmedialaclioneovpoaentisaeommoodementforAhaeatives3,d,and6. 0pg,y
Page 1 and 2: AR TARGET SHEET The following docum
Page 3 and 4: (^N r^ r Proposed Plan for the Cany
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Page 11 and 12: o"N DOF/RIr2001-29 Draft D Redline/
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Page 17 and 18: I f^ ^ DOE!RL-2001-29 Ikaft D Redli
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Page 21 and 22: ! ' t^ Project Prepare the existing
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Page 25 and 26: ^ POINTS OF CONTA CP ^ U.S. Drnartm
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Page 29 and 30: noFIRL-2001-11 Rev. p 1 1)raft P ^
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