_REVISION - M1980244 (31) - Laserfiche WebLink

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? ~ ` .:~ 13 k. Should:;use of the extemal ponds become necessary, based on a potential to exceed the 80% operational capacity`; for the VLF, CC&V will begin detoxification of solution pumped to the external ponds and will increase recirculation of excess solutions froth the P55As onto the VLF. If the average of the water level readings for any one of the PSSAs exceeds 80 percent of the total capacity in a sustained manner, the OMLR will be notified of such occurrence within 24 hours. ri F The apErator has included a fnancial warranty for reclamation of the storm water sediment collection ppnds,wrth a typical design. Since the reclamation warranty is submitted to reclaim These ponds the Division will require the detailed design for these ponds to make sure adequate warranty is in place to ter%aim;these ponds. :.,`,;; ~~:•~ Response: The warranty calculations are strictly for revegetation of the basin area following construction since it is anticipated that these structwes will be retained after operations. If it is decided it would 6e beneficial to remove the sediment detention basins in the future, the as-built information will be used to dcyelop the appropriate financial warranty amount at that timc. This will 6c provided to the OMLR as part ofshe periodic financial warranty review and update process. G. Under Monltortng Page 9$, the operator states, "the underdrains 30-day average of CN WAD for the underdrain exceeds !.0 mg11 and the 30-day running average. " T7iis is not correct. As the operator is aware, tthe Division agreed to .S mP/1 maximum WAD CNfor the underdrain, due to the use of the Cron Clad clayfor Phase I, which was detoxified to .S WAD CN. CC&Yw111 not fy the Division within 24 hours; if the WAD CN is exceeded and proceed wtlh dally sampling as approved fn the Conditinti and in the event that exceedance ~;r not a one time only occurrence, submit a remedial plan within 30 days, Pleaserefer to original adequacy under AM-07 addressing the same tssue. Please remove all reference ta. ~.O;mgR WAD CNfor the underdrain discharge from the text Please also remove the statement on page 9~ which states, "CN WAD concentration must be accompanied by commensurate level of the Free CM's'?Tlte standard was set for WAD CN not Free CN. s; Response: CC&V agrees to revise the maximum 30-day average for WAD CN in the underdrain to 0.5 mg/1. Enclosed in Attachment 7 are revised replacement pages 98 and 99 for the Amendment No. 8 application in response to the OMLR's request related to this matter. .•. ;., ;; Similarly, the discussion of the CN WAD concentration being accompanied by a commensurate level of Free CN will be removed from the underdrain and LDS discussions. Enclosed in Attachment 7 are tevised~replacement pages 98 and 99 for the Amcndment No. 8 application in response to the OMLR's reques4 related to this matter. H. The operator will notify the Division immediately when the maximum head as recorded by the transducers in the HYSCS in Phase I, 77, and IY exceeds 80%, the LYSCS or LDCRS and external ponds is.greater than 2 feet. If the condition is hat temporary, CC&Y must implement a plan to !owes the . heard immediately. ;. ;,:~: Response:; CeGBcV agrees that it will notify the OMLR within 24 hours if the average of the water level readings the FNSCS for Phases I, II and N exceeds 80% of the total capacity or if the water level in the LVSCS or LDCRS for the VLF or the External Ponds is greater than 2 feet in a sustained manner. If the condition does not return to ievcls below those specified within another 24-hour period, CC&V will implement a plan to lower the head. Note that the term "inunediately"has not been a requirement in previous approvals; rather, a 24-hour notification requirement has been imposed for norifying the OMLIt of the exceedenee of the 80% capacity and CC&V plans to continue this notification procedure in Amndment No. 8. c..~: ~i~~_ i; ?: