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f ,w III IIIIIIIIIIIII III STATE OF COLUxAi~U MINED LAND RECLAMATION DIVISION Department of Natural Resources 7373 Sherman St.. Room 275 Denver. CO 80203 303 866-3567 FAX~303 832-8706 of ~~~ ~_~,~ ..t -~`'- -~.. ~e 76 Fp Romr. Go~ertn~ Frec R. 8anu. Drvdon Preno~ DATE: May 3, 1990 T0: Matt Hayes, i ing T m FROM: Carl Mount K / ~ f iz U~~i~ RE: Soil and Spo il Sampling at Mt. Gunnison, Bear, Somerset and Blue Ribb on Mines Mt. Gunnison Mine No. 1: Waste samples - I believe it would be preferable to o girt wo samp es rpm the waste pile material which has been most recently laid down. This location would be between the old waste pile and the natural (topsoil removed) hill slope, assuming that they are still placing waste in this area. Several samples (say five) for each composite sample could be obtained from informal grid points on the sloping lay-down bench on the furthest south part of the pile. Total sample volume should be about one gallon. A sample split should be done and one half of the gallon sample retained in case anything interesting turns uD on the lab analysis reports. Waste samples should have the full suite overburden analyses done on them. Soil samples - I believe it would be useful to obtain two soil samples. One should be taken from material on the side of the waste pile about one-half to two-thirds up from the bottom and composited of soil located throughout the thickness of the topsoil covering (two feet). One should be taken at the very base of the waste pile in the oldest laid down soil material. This sample should also be composited of soil located throuphout the thickness of the topsoil covering, but in only one hole. Generally, one would dig a soil pit and obtain samples from the side of the pit. The same volume of material as above should be taken, sample splits should be done and one split retained until lab results are obtained and reviewed, as above. The purpose of this second sample is to see if any salt migration from the waste to the soil covering is occurring. Soil samples should have the standard MLP,D topsoil analyses run on them. Bear Mine No. 3: Soil sampling may or may not prove anything in regards to a uvium con amination. If a hazardous material spill is fairly recent, then soil sampling may indeed prove that a spill has occurred. Sampling would then be conducted at the spill site and at a relatively close site in similar soil material so the two samples could be compared. If you are more worried about alluvium contamination from spoil waste storage or past hazardous waste spillage, then up-gradient and down-gradient alluvial well samples are going to be better indicators.