PERMFILE70533

• Permit No: C1981048
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: EXHIBIT IV-1 THRU IV-6
• Media Type: D
• Archive: No

6 CON'flll-UT10NB TO ECONOb11C OEOLOOY
orth Fork, Middl~rk, mad South Fo7•k, flow into the Purgntoire
the western part le field. The Purgntoire flows across the area
an eastward direction, but where it reaches the plains it flows
~rthensterly to the Arkansas River. The North Fork begins within
few hwldred feet of the headwaters of the Cuchnrn River on the
j~Ilks of Trincllern Perak at the crest of the Sangre de Cristo ItlouJl-
tins. A high, relatively flat and iJJtricalely dissected divide at tllc
olorndo-New Mexico State line separates the drainage system of the
'urgntoire River from that of the Canadian River.
CLIMATE
The climate of the Trinidad coal field ranges from semiarid in the
loins to subhumid in the mountainous Wrens. The average annual
rainfall ranges from less than 14 inches at Wnlseuburg to almost 30
aches near the summits of the Spuuish Peaks, and the number of
airy days on the peaks is probably three times the number of rainy
rays on the plains. Most of the precipitation occurs from April to
ieptembeq with n general tendency toward drought in June. The
rainfall occurs during the summer months at lower elevations as in-
requeut. heavy thmlderstorms, which convert the streams into
empornry torrents.
Tempernhlres decrease steadily wil.h increase in altitude.
Uthough the mountains are generally colder than the plains, diurnal
Ind annual temperature changes are much greater on the plains.
The following table gives recorded temperature and precipitation
oJ• the Wren.
\Vinds across the cool field ale usually from the west throughout the
year. \Vind movement is slow near the foot of the mountains and
ncrenses in velocity io the east. li]iod velocity is generally greatest
n the afternoon, and the annual Penk in wind velocity is iu the spring.
VEGETATION
\Vith nlt.itudes c•Inging between 0,]50 feet and 13,(123 feet, the
Trinidad coal field includes four Om•al life zones: the foothills (transi-
tion) zone, the montane (Canadian) zone, the snlinlpine (Hudsonian)
zone, and the alpine (Arctic) zone.
About 80 percent of the coal field is in the foothills zone, which at
this latitude generally is between the altitudo of 0,000 feet and 8,000
feet. The entire eastern and northern parts of the coal field (pl. 12)
are in this life zone, and open coniferous forests and grasslands typical
to [he foothills zone reach Lhe western margin of the field along rho
valleys of the Purgntoire and Cuchnrn Rivers.
• CHrrlaloloplcal data Jor Trtnldad cool Jleid and eurrorlndlnp
(From 0.B. Wplher Bureau report7i
Blallon Irem dlJan.IFeh.IMar.IADr.IMaylJunellulylAUe.lBept.l Oel.INoe.lDee.l Mi
Mean preelDllallan, In Inrh<a
Cuehara CempL._._... 7714 0.7e 1.37 116 177 177 1. a1 3.61 1. es Les LM 1.6D LY! 73.r
Oerdner ................ IB .de .ds .B0 1.61 I. EO .71 1. 1.11 .77 .18 .81 ./I 10. D:
Iloehne ................. 17Je .8J .71 7J I. B7 1.71 1.11 131 1.7] I.ID .76 .57 .BO 11.11
GV<le PUe..._....... /6 1.16 1.76 1SD 7.70 101 I. IB 1.13 1.10 1.18 1. SS 1.65 1.67 71.11
6lndrld ................. 13'7 .71 .67 .1s 1.73 1.31 1.67 1.78 1.00 .D8 1.77 .17 .SI 1/. TI
North Late.._......... 63 .M 1.71 1.77 130 1.13 1.68 3. s0 3.07 1.18 1.77 .07 1.06 71.11
BucNO ................. 6 .61 .11 .6B LW Le] .7d 2T8 131 LW .78 .17 .71 IL 11
Btonewsll .............. llla .10 .60 .68 178 1.71 1.61 1.78 7.8] 1.16 1.78 .el .ID 17. D;
Trtnldad .. ............. 67 .e0 .7D .D7 1.81 7.OR 1 71 7. ZO 7.16 1.39 1.17 .7B .61 16.71
Trtnldad Alrporl....... 7D .11 .10 .BS 1.11 7.71 1.31 1. fn I. DI 1.17 .76 .ID .7 1171
Walsenbure ............. 77 .6B .70 1.31 1. W 137 .81 I. e3 1.61 .81 .91 . n 17.7:
Mean lamparalpre, In •P
ID
pwl...._._ 16
........... 16
i Ito: i Ie ~. i tai: s Iii: a lie i t ei: e
Moan mowtall, In Inches
cnen.rs O.mw-.._.... a lo.l 113 IAa 17.1 u.l ao D.o o.0 1.e 1.1 11a a.D IoD.7
O erdner ................ 17 7.1 D.0 11.8 7.1 1.8 .1 trace .0 true .6 60 e.7 s1.0
~ 3
3 1
16 R
7 18
0 Y
1 1 o tr 1
1 7
d 10
1 IO
R IDV
O
NorlhL key.. .___.... : : I: : 0: : lr.
oe ade : : : : :
Trloldsd ............... 16 6.1 7.8 10.0 9.e 10 .0 .0 .0 .7 .B B.0 e.7 61.7
Trtnldad A4DOrl..._... 16 7.1 6.1 7.8 e. l .0 tree tram tram .7 . 1 a.3 6.7 38. a
WeLxnburB ............. 11 7.6 8.4 11.7 l0.1 1.7 .0 .0 .0 1.1 3.a 7.8 7.1 el.e
The montane zone comprises about 18 percent of the area of the
Trinidad cool field, and typical coniferous forests and aspen groves
are found at altitudes between 8,000 alJd 10,000 feet on the flanks of
the Spnnisll Peaks and in t.lJe upland Wrens in t.lle western part of the
field solltlJ of the Spanish Peaks.
1'he snbnlpine zone ranges in altitude from approximately 10,000
feet to timber line, which is at. 11,500 feet on the south slopes and
about 11,000 feet on the north slopes of the Spanish Peaks. The sub-
alpine zone constitutes only about 2 percent of the Wren of the coral
field, and is chnrncterized by dense coniferous forests.
Less than one percent of the Wren of the coal field is in the ulpine
zone above timberline on the Spnnisll Peaks. T17is is nn Wren of steep
slopes, n short growing Benson, and rapid rllnotf of water, nlld there-
fore vegetation is apnrse.
IITILITY
The ]and surface of the Trinidad cool field with the. eaception of
that above timberline is suitable for grazing, farming, or lumbering.
Most of the ]and is favorable for grazing cattle and sheep, and live-
stock is the major ngriculturnl product of the urea. Grazing condi-