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t •. <br />_ , <br />• ~~`~` ~~~`~``-r • III IIIIIIIIIIIIIIII ~.- <br />999 <br />Crl..,f _f:i;~;r_f~C7 f:?i.[[,--'~~.[-:'~'f~/if=CEll f~ai= I-,f=l~L"! I~ <br />~ PCG'Ic 'r, \\'~* Finn'cn 5r~:ipr 1:D <br />,~:~. rtnUr ~b (d ~~. Cll~•. --Dile:IGr <br />tray 17, 1983 <br />H. B. Hu.~phries <br />Trapper Mining, Inc. <br />P.O. 60~: 187 <br />Crain, Colorado E1626 <br />Re: LDPS = CO-0032115, Moffat County <br />Dcar 6ruce <br />This letter is in response to your request of April 29, 1983 to discon- <br />tinue zinc :~onitoring at discharge points 001 and 002. <br />The permit specifies quarterly monitoring until four samples have been <br />tal.en. Follo~:~ing submittal of the zinc data, the Division is [o I~.ake <br />a decision as to (dhether or not a limitation is indicated. <br />The data submitted demonstrates consistently lo~:~ levels of zinc in [he <br />effluent. Furthermore, in the interim betr:~een permit issuance and the <br />present, the Stream Standards and Classifications for the Lo~:er Colorado <br />have been adopted. No zinc standard ~~~as set for any of the receiving <br />~•:aters applicable to your mine site. The nearest classified segment <br />which has a zinc standard is Region II, Segment 2 of the Lo~.+er Yampa <br />River Basin (the Yampa between Lay Creek and the Green River). Segment 2 <br />has a zinc instream standard of O.US mg/l. <br />The conclusion, in this case, is that the low zinc levels in the effluent <br />pose no threat to the nearest stream segment which has a zinc standard. <br />Tfius, the monitoring requirement for zinc is no longer appropriate and <br />may be deleted. <br />If you have any questions regarding [his, feel free to contact me. The <br />Spill Plan submittal is presently being reviewed and any comments relative <br />to the plan ~.~ill be sent under separate cover. <br />Very(~t~ruly yours, (~ <br />Sandy Squire ( cc: EPA <br />Engineering Technician D.E. <br />Permits and Enforcement <br />L.'ater Quality Control Division <br />55/Ic <br />Enclosure <br />4210 EAST 11TH AVENUE DENVER,COLORADO 80220 PHONE (303) 320-6137 <br />