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.. _ .. _. .. _�._ a_ .► . .,.a..�,.v...s.....w.w.. .. _.. .�..s �.� ...��.��...�...�..._.�.....��._..J+»aw.....�..�a..»._........b.du.....�...�..:J........m.J..1...c..,.:{_ .. .,a <br /> environmental scientists and engineers <br /> 50 South Steele Street,Suite 520 voice(303)393-6701 <br /> Denver,Colorado 80209 fax(303)M4704 <br /> November 20, 1990 <br /> Larry Perino - <br /> Environmental Coordinator <br /> Sunnyside Gold Corporation <br /> P.O. Box 177 <br /> Silverton,CO 81433 <br /> Dear Larry: <br /> This letter accompanies our invoice for services rendered in connection with monitoring <br /> of the revegetation test plots and other reclamation at Sunnyside. <br /> I am enclosing two copies of a paper which is based on the talk I will be presenting this <br /> winter at the SME meeting in Denver. It gives some background to the plot studies <br /> (some of which you have seen before)and a summary of my observations at Sunnyside <br /> Basin earlier this fall. Basically,I think the plots still look good. Despite the overall <br /> thin vegetation cover,the vigor of the plants on the treated plots appears excellent. At <br /> this point,if I had to make a choice,I would choose vigor over total cover. <br /> You have been sent copies of the results of the sample analyses from ProMac. The <br /> numbers show the ProMac is still doing its work. I have not included a recap of those <br /> results in my report. If samples are taken again next year,I would like to see them <br /> analyze the bacterial populations,which they did not do this year. <br /> I am a little disappointed in the appearance of the vegetation in the old engineering <br /> office area below the mill. Given the robust species which have been seeded on that <br /> site, there should be a much better stand there than there is. If this stand is not much <br /> improved during the next growing season,I might well be inclined to call it a failure <br /> and recommend additional rehabilitation. With my limited visits to this site,it is hard to <br /> pinpoint just what the cause of the poor performance of the vegetation is. Quite likely it <br /> is a combination of causes. These may include poor site drainage,poor soil structure <br /> or compaction,lack of moisture and/or excess moisture, and early or late frosts. I did <br /> notice that where there was a more gravelly surface,vegetation seemed to be doing <br /> better. Also,next to the irrigation pipes there seemed to be better growth—maybe a <br /> sheltering effect Areas with a fine textured surface are generally lacking in vegetation. <br /> These materials have a massive structure and firm consistency,which are very poor <br /> characteristics for seedling establishment. A number of the shrubs are surviving, <br /> although vigor does not appear to be real good. The paper mulch does not seem to be a <br /> suitable mulch material, and I would not recommend using it any further. I would <br /> strongly recommend consideration of an organic amendment such as manure or sewage <br /> sludge if it should become necessary to re-seed this area. <br /> The embankment face at tailing pond#4 looks pretty good. Vegetation should continue <br /> to be monitored closely—there is not much we can say for sure after just one growing <br /> season. There are some signs that windblown tailing may be a bit of a problem as well <br />