2000-04-05_PERMIT FILE - M2000002

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_.. _ _ _ ..,..,...,., rtpr ~ "tuUU 13 ~ A7 P. 08 flrri ~ o ~~ ~ Ror) Identitieatian of the Selected Remedy • The Army will treat any contaminated extracted grottndwater prior to dischazge or reinjection so that it meeu the current water quality standards established in the Colorado Basic Standards for Groundwater and the Colorado Basic Standazds and Methodologiesfor Surface Water. • As of the date of the Onpost ROD, and based one 0.392 parts per billion (ppb) detection limit, the U.S. Army will use the last available quarterly monitoring results to determine the DIMP plume footprint. • The Army and Shell Oil Company will pay for the extension of, end hook-up to, the current water disaibuaon system for all existing well owners within the D1MP plume footprint referenced above. • Existing domestic well owners outside of the DIMP plume footprint ea of the date of the Onpost ROD where it is later determined that levels of DIMP are eight ppb ar greater (or other relevant CBSG at the time) will be hooked up at the U.S. Army and Shell Oil Com- pany's expanse to the SACWSD distribution system or provided a deep well or other permanent solution. • For new domestic wells with levels of eight ppb or greater (or other relevant CBSG at the time), the Offpost ROD institutional controls will provide that the U.S. Army and Shell Oil Company will pay for Look-up to the distribution system or provided a deep well or other permanent solution. • The parties to the Conceptual Remedy Agreement commit to good faith best efforts to establish a trust fund for the operations and maintenance of the remedy, including habitat and srorficial soil. The parties rewgnize, however, that establishment of sunk a trust fund requires special legislaaoa and there are restrictions on the actions federal agencies can take with respect to proposing legislation and supporting proposed legislation. • As part of the Onpost remedy, the U.S. Army and Shell Oil Company will pay for and provide, or arrange for the provision, of 4000 sae-feet of water to SACWSD. 9.q Cent of Selected Remedy A detailed cost summary for the selected remedy is presented is Table 9.1. The total estimated cost rar~ges from approximately S69 to S76 million. This cost does not iadude implementarioa of the additional components discussed in Section 9.3. However, these additional components would be included in all the alternatives evaluated (except the No Action alternative); therefore, the relative relationship of the cost of the various alternatives will not change. 9.5 Lienitatiens It should be recognized that U.S. Environmental ProteetionAgency (EPA) studies (EPA, 1988b) have indicated that it may not always be possible to reach MGis or proposed MCIs tLrotygh currently available rachaolo$y. If It Dacomea apparent duilag lraplemencauoa or operation or the selected 9.6 Harding liWSen As'soeiates '21905 402010