2005-06-24_REVISION - M2000016 (13)

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~FARG E NCIRTH AMERICA AGGREGATES, CONCRETE Ei ASPHALT gradients must be clearly defined on associated maps. The applicant also needs adequate monitoring of potentialty impacted welh and vegetation. As discussed at the May 6`~ meeting, the need for additional monitor wells will be revisited after the Division reviews the additional groundwater model maps submitted with this letter. 2ti. Memo Item 17: In considering the applicant's response, the Division will require monthly monitoring ofground water levels in the monitoring wells associated with that phase or one year riot to commencement of mining in that phase. Please also see above responses to Memo Item 16. Once proper identification of tDle cone of depression and the extent of mounding and shadowing has been made, consideration of monitoring frequency of other wells based on the cone of depression will be addressed. Lafarge aclrnowledges that groundwater monitoring in a particular phase must occur monthly for five quarters prior to mining that phase. If the frequent ground water monitoring validates the results of the groundwater or once the cone of depression and the extent of mounding and shadowing has been identified, Lafarge ~Nill request decreased frequency of well monitoring. Water balance (P. 28 of 81) 27. Merno Item 20: The applicant needs to provide an updated copy of "Operational Losses, Table 3 "that was reportedly modified to reflect the corresponding phases of mining. The updated copy of "Operational Losses, Table 3" in enclosed, it has been modified to reflect the corresponding phases of mining. Stormwater Management Plan ("SWMP') 28. Page 4 of 19 of the new SWMP submitted appears to need correction. The submitted plan states it wia prepared for the "Howe Concrete Plant" and the industrial activities at the site include "Quarrying. "The applicant must submit a corrected page to the Division. The corrected page should also include Excavation and Reclamation as Industrial Activities, as in the prior SWMP, and Grading, as Appropriate. Please check page 5, as well, and submit any corrections. Page 7 also refers to the Howe facility. The'SWMP has been corrected and updated, see enclosed. 29. Memo Item 27.• Please state where in the application the applicant has listed the specific BMPs to be implemented and "the maximum number of controls "for the Division to use in bond calculations. Please also indicate where (including sizes of structures) each will be used so the Division can calculate the applicable bond amount for removal and/or reclamation of such structures. The SWMP currently does not indicate specific BMPs to be implemented because there is currently no disturbance and therefore no controls necessary. However, the following is a list of typical BMPs and structures used at other plant sites so the Division can calculate an applicable bond amount for removal and/or reclamation of structures. The quantity of structures has been provided assuming a phased bond. LAFARGE NORTH AMERICA ING. -Lafarge Construction Materials 10170 Church Ranch Way, Suite 200, Westminster, Colorado 80021 Telephone: (3031 657-4000 Facsimile: (303) 657-4037