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iiiiiiiiiiiiiiiiiii 999 STATE OF COLORADO MINED LAND RECLAMATION DIVISION oF.~o~o Department of Natural Resources New \Ay 1313 Sherman St., Room 215 ~$ Denver, C080203 '~y~.~~,. ~ 303 866 3567 . rs~c RA x: 303 832-8106 Roy Romer, Governor Fretl R. Banta, Division Dnecbr DATE: May 16, 1990 T0: Cathy Begej n FROM: Matthew Hayes ~~ RE: Review of Revegetation Data and Reclamation Description Provided as Part of Midterm Response Package in the Addition to Appendix F: Canadian Strip, File C-81-026 In conjunction with reviewing the Canadian Midterm Response Package for vegetation and soils issues, I also reviewed the vegetation monitoring data submitted in response to adequacy issue 7. The cover page to this data consists of an interoffice memo from Dave Stout to Mike Kolin dated October 3, 1983. According to the recently submitted Phase II Bond Release application, reclamation of the mine site was done in two stages. a. 24 acres completed in 1984; b. 82 acres completed in 1987. However, the memo dated October 3, 1983 identifies that reclamation on the 24 acre parcel reclaimed in 1984 actually began in 1979. Reclamation was in three phases. An outline of details presented in the memo is located in Tables 1 and 2 enclosed at the end of this memo. The bulk of the rest of the addendum to Exhibit F consists of cover data collected by the operator in 1983, 1988 and 1989. 1983 and 1988 data is reviewed below. 1989 data is briefly addressed below and will be reviewed in more detail as part of the Phase II Bond Release request process. A) Cover Data Collected September 22, 1983. The operator ran three cover transects in three different locations. Typically when collecting cover data, the sampler will set up an optical point frame at 10 meter intervals along a 50 or 100 meter transect. The optical point frame has 10 sightings on it, allowing 10 data points or "hits" to be collected at each location where the optical point frame is set up. Thus, for a 50 meter transect, 50 data points are collected and for a 100 meter, 100 points are collected, 10 at each of the point frame set up locations. It is important to understand that a sample unit is an entire transect. Thus, when calculating sample adequacy, data from each complete transect are used in the calculation. A common misunderstanding is that point frame set up locations represent samples rather than subsamples. Samples must be randomly placed inside the area of concern. subsamples (set up location) at regular intervals spaced only 10 meters apart are not considered to be randomly placed throughout the sampled area.