_GENERAL DOCUMENTS - C1981017 ‎(169)‎

• Permit No: C1981017
• IBM Index Class Name: GENERAL DOCUMENTS
• Doc Name: Bid Documents ‎(IMP)‎
• Permit Index Doc Type: General Correspondence
• Media Type: D
• Archive: No

0a,n -15 -96 09:18A Colo Geo Survey 3038662461 P_02
STATE OF COLORAL-AIJ - - -
COLORADO GEOLOGICAL SURVEY
olvision of minerals and Ceoic*iy PM. T.W.,k I
Department of Natural Resources
1313 Sherman 5rreer, Raven 715
Denver, Colorado 80203
Phone [phone]
FAX [phone]h t DEI)AR.TMENT OI'
NATURAL
RESOURCES
January 15, 1SM Ituy Kamer
x.avrnu��
),•mew ti L�chhc,vi
Steve Renner Ckca Dim, DIrmir)t
Division of Miners is and Geology t_„mr,
Department of Natural Resources un
V{r ki Cow.,rr
2148 Broadway, Suite C -5
Grand junction, Co 81503
RE: OLtober drilling at Mid Continent Mina
Mr. Renner:
Results of analytical samples collected from soil borings, from the! Octnbcr
drilling activities at the Mid Continent Mine's former maintenance facilities do
not indicate a serious threat to human health and environment. Five water
samples and one "worst cage" soil sample were collected for laboratory analyses.
Water simples were collected from monitor wells MW1, MW2, MW3, MW5, and
a seep obtierved in Coal Creak.
Samples From MW1, MW3, and MW5 were analyr - far cc }ncentratic)rts of
benzene, toluene, ethylbenzene, and total xylenes (BTEX) by EPA method 8020
and extractable petroleum hydrocarLx)ns (EPH) by modified APT nnietho d $100.
Results indicated low conccr(trations of petroleum compounds with a
noteworthy exception of 6.4 parts per billion (ppb) of bt rizene in MW1. This
concentration is slightly alxwe the ( "0lorado Ground Water Standard of 5 ppb for
benzene.
Well MW2 was Analysed for concentrations of volatile organic cornrumnds
(V(-)C) by method 826U and semi- volatile organic compounds by method 8270.
This well was sampled for these parameters lx--cause it appeared to be the most
significantly impacted, by visual obs— rvations and associated petroleum odors,
of the five walls installed. Results of these analyses also indicate low
concentrations of petroleum compounds. Most of the vomlx)unds detected were
below the reporting limits. The one exception was 86 ppb of 1,2,4 -
h-imethylbenzene. Colorado Ground Water Standards do not list a standard
spat ific. for this compound.