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ATTACHMENTB Twin Lakes Redevelopment Phase I M:PCA VIC Proj ect Number VP467 1 MODIFICATIONS AND COMMENTS 1. Figures 6 through 9 of the Report illustrating the locations of the proposed borings cunently do not illustrate thc locations of existing bnildings (or identified areas ofconcem). The M:PCA staff requested additional figures on June 23, 2005, to provide overlays of existing buildings via e-mail correspondence with AET. Electronic versions of those additional figures were provided to the . M:PCA project staff on June 28, 2005, and have been reviewed. The M:PCA staff understand that these fi ures will be rovided as part of a su lement or amendment to the Re art in order to - facilitate review of the locations of the proposed borings relative to t e locations of existing structures. 2. Section 1.2, page 13. Figure 10 is described as a grading plan that shows cuts and fills. The figure includes a legend for cut and fill, with a color pattem to illustrate the respective areas proposed for cuts and fill. ~CA staff request that once a cut and fill plan with contours has been finalized that copies oftheseJ,2lans be rovided to the M:PCA with a description of any significant nlodifications to the cut and fill plan as illustnted on Figure 10 or in Ta les 1 through 11. 3. Section 2.1, Scope ofW OTk. The scope of work for the soil investigation shonld include focnsed -====. screening and sampling of the shallow soils for volatile organic compounds (VOCs) in both the Vlcml of Monitoring Well MW-2 as well as the area of the Indianhead Parcel where chlorinated solvents have been detected in shallow groun watcr. Similarly, d."eper ground water characterization should be conducted in the vicinity of the h1dianhead VOC ground water release and shallow ground water characterization in the vicmlty at M W -'1. 4. During the advancement of the probes proposed in the Report, the M:PCA staff recommend that additional samples be collected as neces3!ill'J~em1ine the extent and character of the fill encountered in the shallow soils on the~ p~J);ontaining debris inclnding plastic, wood, and styrofoam (see conID1ent lb in the October 2004 M:PCA RAP review letter). This type offill debris is not appropriate for residential land use and should be delineated, characterized and targeted for removal. . ~ S. The Contingency Plan is acceptable for the proposed Phase II Work proposed, however, info11l1ation regarding how ~vestigation-derived waste (IDW) shall be managed shall he provided to the M:PCA. 6. Section 3.5, page 18. In addition to collecting samples for RCRA metals in soils or fill containing ashes, cinders, or clinkers, the MPCA staff recommend that samples for RCRA metals be collected. and analyzed to characterize debris fill identified from previons investigations at the P1K. In addition, the M:PCAsta!! recommend that sclectecl;-J-epresentative samples for RCRA metals be COllected to characterize pOliions of the excess fill that will be targeted for offsite disposal. Although the excess fill soils are proposed to be characterized dnring this investigation, please note that the M:PCA staff may request additional characterization based on the final cut/fill plan, results of this investigation, and depending upon the proposed offsite use for the excess soils. 7. Section 3.4. Please provide proposed ntiEties map once this infoill1ation is available as pari a Report supplement illustrating the depth and type of utility service, and also indicate which existing utilities will remain and which will be abandoned if any.