Northeast Wyoming River Basins Water Plan
Technical Memoranda

Appendix C

Data Summary of Hydrogeology, Hydrologic Properties and
Well Specific Capacities of Selected Aquifer Systems,
Northeast Wyoming River Basins Plan Area

Appendix C.1
Madison Aquifer System

Figure C.1.1. Depth to the Madison Limestone and Equivalent Rocks
in the Powder River Structural Basin and Adjacent Areas.

Figure C.1.2. Thickness of Madison Limestone in Wyoming and its Regional Limits.

Figure C.1.3. Potentiometric Surface in the Madison Aquifer
(after Swenson and others, 1976).

Table C.1.1 Reported Transmissivities and Storage Coefficients for the Madison Aquifer in the Madison River Structural Basin, Wyoming

Area	Transmissivity (gpd/ft)	Storage Coefficient	Source	Method Used
USGS Test Well (57/65-15)	3,000 - 21,000	-	Blankennagel et al. 1977	Drill stem tests
Gillette Well Field (51/66-6)
Well CR-4	150,000	2 x 10-4	Wyoming Water PlanningProgram, 1977	Single well pump test
Well CR-4	150,000 - 300,000	-	Montgomery, 1979	2-well pump test and other data
Well City #1	~10,000	-	Montgomery, 1979	2-well pump test and other data
Newcastle Area	5,000 - 15,000	10-4	Wyo. St. Eng., 1974	Estimate
	58,000	9 x 10-5	Woodward-Clyde, 1980	Flow and recovery, 2 wells
Well # 45/61-28	29,920	-	Swenson et al., 1976	Specific capacity based estimate
Well # 45/61-20	11,000	-	Woodward-Clyde, 1980	Constant discharge test
Near Hartville Hills in S.E.	1,000-3,000	1 x 10-4 - 5 x 10-5	Wyo. St. Eng., 1974	-
ETSI Wellfield (Niobrara Co.)	1,000-3,000	5 x 10-5	Stockdale, 1974, also Anderson and Kelly, 1974	Hantush method for leaky aquifers
	4,900-7,320 2,420-3,400	4.5 x 10-5 - 7.8 x 10-5 7.7 x 10-4 - 9.2 x 10-5	Rahn, 1975 Rahn, 1975	Jacob Method Theis curve, no leakage
Near Douglas, in South	500-1,000	10-4 (est)	Wyo. St. Eng., 1974	-
Midwest Area	8,400 6,462-16,156	- -	Konikow, 1976 Konikow, 1976	Flow net analysis Steady state model calibration
Near Bighorn Mts. in N.W.	8,000-89,000	4.3 x 10-4 - 3.2 x 10-4	Wyo. St. Eng., 1974	-
Entire Basin Average	6,460-25,850 6,460-23,260*	- -	Konikow, 1976 Konikow, 1976	Recharge based steady state Model calibration Potentiometric based steady state model calibration

* Value temperature dependent.

Table C.1.2 Calculated Specific Capacities (Yield Per Unit Drawdown) of Madison Aquifer Wells,
Powder River Structural Basin, Northeast Wyoming River Basins Plan Area, Wyoming

Well # (T/R-Sec. ¼, ¼)	Date	Test Duration (hrs)	Drawdown (ft)	Yield (gpm)	Specific Capacity (gpm/ft)	Data Source	Remarks
CROOK COUNTY
51/66-6 BCB	5/8/79	---	134	82	0.61	5	-Step discharge test
		---	223	128	0.57	5	30 min. steps
		---	296	171	0.58	5	pre acid frac
		22.75	301	166	0.55	5	final step, 20 + hrs.
	6/28/79	---	19	82	4.3	5	-Step discharge test
		---	34	128	3.8	5	30 min. steps
		---	49	171	3.5	5	post acid frac.
		---	93	280	3.0	5
		---	151	430	2.8	5
		---	242	590	2.4	5
		---	274	635	2.3	5
		15.25	295	635	2.2	5	final step, 12 + hrs.
+52/63-25 DC	-/-/71?	1	58	175	3.0	1	.Held for 24 hours.
		1	14	190	13.6	1	.Held for 30 days.
	-/-/72	24	74	200	2.7	2
53/65-18 BBD	9/26/62	140 min.	1	15	15.0	2	-Step discharge and
		80 min.	4	25	6.2	2	recovery tests
		120 min.	6	30	5.0	2
		110 min.	9	37	4.1	2
		95 min.	10	40	4.0	2
		12	13	45	3.5	2
		16	19	55	2.9	2
57/65-15 DAC	10/20/76	---	---	---	2.1	4	From drill stem test (#15)
		---	---	---	1.1	4	From drill stem test (#16)
NIOBRARA COUNTY
+36/62-28 AB1	-/-/74	24	95	57	0.60	1
	4/24/74	108	88	57	0.65	6
+36/62-28 AB2	-/-/74	3	370	170	0.46	1
	5/-/74	179 min.	217	104	0.48	2
		204 min.	386	180	0.47	2
	5/3/74	120	266	125	0.47	6
	5/19/74	198?	390	180	0.46	6	-Discharge reduced after
		24½ days	330	150	0.45	6	8¼ days pumping
	8/28/74	96	370	170	0.46	6
	9/7/74	48	370	170	0.46	6
39/62-2 AAB	-/-/62	?	36	30	0.83	2, 3	Swab test
	2/26/63	1	36	60	1.7	1
WESTON COUNTY
44/63-26 CAC	6/6/67	5	23	250	10.9	1
	6/-/67	5	175	250	1.4	3
45/61-20 DCA	-/-/49	?	462*	1600	3.5	1
	unk	?	173	600	3.5	3	-Static water level pre-
		?	277	1000	3.6	3	sumed equal to original
		?	462	1500	3.2	3	shut-in pressure (+462 ft)
	unk	?	127	600	4.7	2	-Static water level pre-
		?	231	1000	4.3	2	sumed equal to 1962 shut-
		?	416	1500	3.6	2	in pressure (+416 ft)
45/61-20 DCC	-/-/78	?	381*	640	1.7	1
45/61-21 CBD	4/-/66	72	200	460	2.3	3
	9/1/66	72	141?	463	3.3	1	-Reported drawdown may not
							include SIP component
	unk	?	60*	50	0.83	2
+45/61-28 AB-	-/-/62?	3 wks.	270*	1200	4.4	1, 2
	7/-/65	?	18	276	15.3	3
45/61-29 CBB	5/20/60	8 min.	462*	117	0.25	1
	unk	?	346*	120	0.35	2
45/61-30 ADB	7/-/60?	?	300*	650	2.2	2
45/61-33 AB	4/-/64?	?	323*	290	0.90	1, 2	.Restricted surface flow.
46/63-10 CDA	8/28/79	739 min.	638?	579	0.91	1
46/63-15 BDC	-/-/51	?	393*	500	1.3	2
	unk	?	393*	190	0.48	2
46/63-17 CBC	-/-/69	?	531*	800	1.5	1	.Flow through 2 inch hose.
	-/-/69?	?	647*	800	1.2	1, 2	Different reported SIP
	8/-/73	?	427*	800	1.9	2	Flow may not be 1973 data
46/64-13 CCA	-/-/60?	?	92*	30	0.33	2	Yield may not be 1960 data
+46/64-19 BDC	-/-/56?	?	80	280	3.5	3	Plugged, 1965
46/64-23 CCB	3/5/65	6	65	70	1.1	1	Swab test
	6/-/72	Sev. Wks.	293	308	1.1	3
46/65-20 CDD	9/19/60	6	295?	425	1.4	1
46/65-23 BAD	6/-/72	2 mos.	76	225	3.0	3
	unk	?	400	600	1.5	2
46/66-25 DBB	4/16/62	1	30	354	11.8	1
	6/-/72	4 mos.	211	360	1.7	3
47/60-4 AA	8/9/65	36	5?	8	1.6	1
48/65-25 CBB	-/-/49	55 min.	517	15.4	0.03	1
	6/-/72	6	110	210	1.9	3
48/65-35 CC-	6/-/72	5	101	155	1.5	3	6 hrs. per source #2

Table Source:

Feathers, K.R., Libra, R., Stephenson and Eisen, C. 1981. Occurrence and characteristics of ground water in the Powder River Basin, Wyoming. Laramie, WY: University of Wyoming, Water Resources Research Institute, pp. 63-66.

Table C.1.3 Hydrologic Properties of Permo-Pennsylvanian Rocks of The Madison Aquifer System, Powder River Structural Basin, Northeast Wyoming River Basins Plan Area, Wyoming (Determined from Oil Field Data)

Field	Approximate Location (T/R)	Pay Thickness (ft)	Porosity (%)	Permeability* (md)	Calculated. Transmissivity (gpd/ft)	Data Source
Upper Minnelusa Fm. ("Converse" sands):
Basin	47/70	24	14.7	61.8	27	5
		30	---	62	34	4
		45	---	46	38	4
Basin Northwest	47/70	---	12.7	48.4	---	5
Bishop Ranch	48/70	180	---	100	328	4
Bishop Ranch South	48/70	---	15.1	100	---	5
Deadman Creek	53/67	18	17.6	---	---	5
Dillinger Ranch	47/69-70	30	16.8	100	55	5
Duvall Ranch	49/69	---	17	88.8	---	5
Donkey Creek Area	49-50/68	0-50	8-25	20-1000+	<910	1
Guthery	51/68	---	18.9	184	---	5
Halverson Ranch	49/69	37	14.3	132	89	2
		---	13	56	---	5
Hamm	51/69	35	19.7	239	152	5
Kummerfeld	50-51/68	---	17	208	---	5
Lance Creek	35-36/65	30	16	3	2	3,5
Mellott Ranch	52/68	25	16	---	---	5
Pickrel Ranch	48/69	---	16.1	126	---	5
Pleasant Valley Ranch	51/69	---	11.1-14	29	---	5
Prong Creek	50/67	36	8.6-24.6	13-936	9-613	2
		26	18.5	411	194	2
		45	23	834	683	2
Rainbow Ranch	49/71	10-35	17	170	31-108	2
		20	16	90	33	2
Raven Creek	48/69	15-65	<19	<200	<237	2
		30	13	60	33	2
		35	15	50-200	32-127	3
		38	15	92	64	5
Robinson Ranch	50/67	18±	14	200	66	3
		22±	21	440	176	3
Rozet South	50/70	---	17.8	212	---	5
Stewart	50-51/69	---	5.8-14.8	10.7-134	---	5
Timber Creek	49/70	40	16	80	58	2
		20	16	80	29	2
Whisler	50-51/70	12.1	18.6	242.2	---	5
Middle Minnelusa Fm. ("Leo" sands):
Lance Creek	35-36/65	100	8-23	0.5-324	1-590	3

Notes:
*Md x 18.2 x 10-3 = gpd/ft2, assuming fluid is water at 60ºF.
.Assuming fluid is water at 60ºF and pay thickness equals aquifer thickness.

Date Sources:

1 - Wyoming Geological Association, 1958 2 - Wyoming Geological Association, 1963 3 - Wyoming Geological Association, 1957 (supplemented, 1961) 4 - Wyoming State Oil and Gas Commission files 5 - Collentine and others, 1981

Table Source:
Feathers, K.R., Libra, R., Stephenson, T.R., and Eisen, C. 1981. Occurrence and characteristics of ground water in the Powder River Basin, Wyoming. Laramie, WY: University of Wyoming, Water Resources Research Institute. pp. 70-72.

Appendix C.2
Dakota Aquifer System

Figure C.2.1 Potentiometric Surface in the Dakota Aquifer System (from Lobmeyer, 1980).

Table C.2.1 Hydrologic Properties of Lower Cretaceous Rocks of The Dakota Aquifer System, Powder River Structural Basin, Northeast Wyoming River Basins Plan Area, Wyoming (Determined from Oil Field Data)

Field	Approximate Location (T/R)	Pay Thickness (ft)	Porosity (%)	Permeability* (md)	Calculated. Transmissivity (gpd/ft)	Data Source
Newcastle/ Muddy Ss.:
Bertha	54/69	4	23	334	24	1
Clareton	42-43/65-66	---	9.3	5	---	7
Fiddler Creek West	45-46/65-67	5.8	20	1-18	0.1-2	7
Fiddler Creek East	46/64-65	50a	18.6	3-6	3-5	7
Hilight	43-46/69-71	---	20.3	104	---	7
Joe Creek	47/72	29	12.2	---	---	7
Kitty	50/73	22	16	345	138	3
Lance Creek	35-36/65	10-20	17	20	4-7	7
Lazy "B"	49/73-74	100-300a	13.6	14.1	26-77	7
Lightning Creek	35/65-66	0-12	19.5	10	<2	7
		6	21	13	1	1
Lonetree Creek-Lodgepole Creek	44-45/66-67	4	---	<1	---	1
Osage	46/63-64	5	22.8	44.2	4	7
		---	23	25.9	---	7
		8	18.1	87.7	13	7
		---	21.1	51	---	7
		10	23.3	428	78	7
		8	22	55	8	7
		8-13	19.1	2-87.7	0.3-21	7
Rozet East	50/69	---	15	63	---	7
Rozet	50/69-70	10-45	20	58	11-48	1
Skull Creek	44-45/62	8-38	15.8	89	13-62	7
Slattery	49/69	4	20	15	1	1
Springen Ranch	50-51/71	---	2-15	2.4-588	---	7
Steinle Ranch	39/69-70	6	12.6	8.3	1	2
		6	13.5	133.8	15	2
Timber Creek	49/70	20	20	100	36	4
Fall River/Dakota Ss.:
Bridge Creek	39/61	4	23.5	733	53	1
Coyote Creek	48-49/68	40	14.5	200	146	1
Coyote Creek South	48-49/68	60	18	200	218	3
Donkey Creek Area	49-50/68	20	16	150	55	1
		0-20	15	<10	<4	5
		0-20	15	<5	<2	5
		0-50	13	10-1000	<900	5
Kummerfeld	50-51/68	28	19	250	127	1
		>30	17	100-2000+	---	4
Lance Creek East	36/64	30	15	0-302	<165	1
Lonetree Creek-Lodgepole Creek	44-45/66-67	10	15	200	36	1
Miller Creek	51/68	26	18.5	200	95	1
		35	18.5	200	127	4
Lakota/Cloverly Fm.:
Sherwood	40/77	15	16	<25	<7	5

Notes:
^*Md x 18.2 x 10-3 = gpd/ft2, assuming fluid is water at 60ºF.
^.Assuming fluid is water at 60ºF and pay thickness equals aquifer thickness.
^aReported as gross formation thickness rather than net pay.

Date Sources:

1 - Wyoming Geological Association, 1957 (supplemented, 1961) 2 - Wyoming Geological Association, 1976 3 - Wyoming Geological Association, 1968 4 - Wyoming Geological Association, 1963 5 - Wyoming Geological Association, 1958 6 - Wyoming Geological Association, 1954 7 - Collentine and others, 1981

Table Source:
Feathers, K.R., Libra, R., Stephenson, T.R., and Eisen, C. 1981. Occurrence and characteristics of ground water in the Powder River Basin, Wyoming. Laramie, WY: University of Wyoming, Water Resources Research Institute. pp. 89-92.

Table C.2.2 Reported Specific Capacities (Yield Per Unit Drawdown) of Wells in The Dakota Aquifer System, Powder River Structural Basin, Northeast Wyoming River Basins Plan Area, Wyoming

Well Location (T/R-Sec. ¼ ¼)	Geologic Formation(s)	Test Date	Test Duration (hrs)	Drawdown (ft)	Discharge (gpm)	Specific Capacity (gpm/ft)	Data Source	Remarks
CROOK COUNTY
55/61-8 DC	Kfr & Klk	8/3/56	2	33.5	3.2	0.10	1	Flowing well
56/62-28 BB	Kfr & Klk	7/21/56	4	21.2	9.2	0.47	1	Flowing well
-29 DD	Klk	7/21/56	2	12.3	2.9	0.24	1
56/65-8 CC	Klk	11/2/56	?	20.	25.	1.2	1	Flowing well
NIOBRARA COUNTY
34/65-1 BB	Kik	10/-/59?	---	50 E	60	1.2	3
-1 BC	Kik	10/-/59?	---	50 E	220	4.4	3
35/65-35 AB	Kik	-/-/41	---	35	140	4.0	3	Flowing well test
36/61-24 CC	Klk	7/-/60?	2	300	40	0.13	4
37/62-1 BA	Klk	6/17/71	---	15	7	0.47	4	Bailer test
38/62-25 DC	Klk	5/10/67	7	44	30	0.68	4
40/60-29 BD	Klk	-/-/69	24	120	6	0.05	4
40/61-25 CDD	Klk	6/15/70	72	350	8	0.02	4
WESTON COUNTY
44/62-11 CC	Kfr & Klk	1/15/70?	4.5	350	66	0.19	4	Pumped flowing well; drawdown may not include pressure head component
45/62-22 CC	Klk	1/13/73?	2.5	300	88	0.29	4	Swab test on flowing well; drawdown may not include pressure head component
46/63-18 AD	Klk	10/30/59	21	70	18.9	0.27	4,5	Flowing well
46/64-13 AA	Kfr & Klk	8/15/77?	---	28	10	0.36	4	Flowing well
-13 CCA	Klk	8/-/59	---	150	58	0.39	5	Flow test
		6/16/59	1	150	210	1.4	4,5	Flow test
		8/19/60	~9 mos.	175	75	0.43	5	Long term pumpage
-24 ADA	Klk	2/1/46	?	46	42	0.91	4,5	Flow test
-24 ADA	Klk?	7/9/77?	?	69	5	0.07	4	Flow test
47/63-30 CC	Klk	9/25/60	?	30 E	8.5	0.28	5	Flow test
47/65-1 DAB	Klk	5/1/76?	2.5	400	4	0.01	4
48/65-25 CAB	Klk	---	72	490	38	0.08	4
-35 AB	Kfr?	---	3	510	4.5	0.01	4
-35 CCB	Klk?	---	72	405	35	0.09	4

Abbreviations:

Kik = Inyan Kara Group Kfr = Fall River Formation Klk = Lakota Formation Kcv = Cloverly Formation E = Estimated

Date Sources:

1 - Whitcomb and Morris,1964 2 - U.S. Department of the Interior, 1974 3 - Whitcomb, 1965 4 - Wyoming State Engineer's Office permit files 5 - Whitcomb, 1960

Table Source:

Feathers, K.R., Libra, R., Stephenson, T.R., and Eisen, C. 1981. Occurrence and characteristics of ground water in the Powder River Basin, Wyoming. Laramie, WY: University of Wyoming, Water Resources Research Institute. pp. 86-87.

Appendix C.3
Fox Hills/Lance Aquifer System

Figure C.3.1 Contours on Water Levels in Wells Finished in the Fox Hills Sandstone,
Lance Formation, and Lower Part of the Fort Union Formation in the Gillette Area, Wyoming
(from Northern Great Plains Resource Program, 1974).

Table C.3.1 Reported Transmissivities And Permeabilities for Wells in the Fox Hills/Lance Aquifer System, Powder River Structural Basin, Northeast Wyoming River Basins Plan Area, Wyoming

Well Location (T/R-Sec. ¼ ¼)	Geologic Formation(s)	Test Date	Test Duration (hrs)	Saturated Aquifer Thickness (ft)	Transmissivity (gpm/ft)	Calculated* Permeability (gpm/ft2)	Data Source/Remarks
CROOK COUNTY
49/68-36 DB	Lance	6/19/56	2	29	170	6	Whitcomb & Morris, 1964; order of magnitude estimate due to short test duration.
50/68-14 CD	Lance	6/21/56	2½	40	1060	26	Same as above.
-24 CD	Lance	6/21/56	2	60	2100	35	Same as above.

^*Calculated by dividing transmissivity by the saturated aquifer thickness.

Table Source:

Feathers, K.R., Libra, R., Stephenson, T.R., and Eisen, C. 1981. Occurrence and characteristics of ground water in the Powder River Basin, Wyoming. Laramie, WY: University of Wyoming, Water Resources Research Institute. p. 105.

Abbreviations:

Kfh = Fox Hills Sandstone K1 = Lance Formation Tft = Tullock member of Fort Union Formation E = Estimated

Date Sources:

1 - Lowry, 1972 2 - Littleton, 1950 3 - Northern Great Plains Resource Program, 1974 4 - Whitcomb and Morris, 1964 5 - Whitcomb and others, 1966 6 - Crist and Lowry, 1972 7 - Whitcomb, 1965 8 - Lowry and Cummings, 1966

Table Source:

Feathers, K.R., Libra, R., Stephenson, T.R., and Eisen, C. 1981. Occurrence and characteristics of ground water in the Powder River Basin, Wyoming. Laramie, WY: University of Wyoming, Water Resources Research Institute. pp. 101-103.

Appendix C.4
Fort Union/Wasatch Aquifer System

Figure C.4.1. Water Levels and Direction of Horizontal Movement of Ground Water
in the Fort Union and Wasatch Formations in the Gillette Area, Wyoming
(modified after King, 1974; from Northern Great Plains Resource Program, 1974).

Table C.4.1 Transmissivities of The Fort Union/Wasatch Aquifer System, Powder River Structural Basin, Northeast Wyoming River Basins Plan Area, Wyoming

Site Name	Location (T/R)	Test Date	Test Typea	Tested Thickness (ft)	Transmissivity (gpm/ft)b	Permeabilityb (md)	Storage Coefficient	Data Source	Remarks
Fort Union Formation
Black Thunder Mine	43/70	---	Pumped well & recovery	---	7200	---	---	1	Jacob method, data skewed
Belle Ayr Mine	48/71	---	Pump & recovery	60	1528		2.2x10-3	2
		10/6/76	Slug	20	100	5.0C	~4x10-4	3
		10/6/76	Slug	20	---	---	---	3	No recovery after 15 min.
		10/6/76	Slug	20	---	---	---	3	No recovery after 15 min.
USGS Tests	49/68	6/21/56	Pumped well	30	160	6	---	8	2.5 hour test
		6/22/56	Pumped well	87	430	5	---	8	7 hour test
		6/22/56	Pumped well	107	60	0.5	---	8	2 hour test
		6/27/56	Pumped well	70	30	0.5	---	8	3 hour test
East Gillette Mine	50/71	10/26/76	Slug	20	371	19.0C	1x10-5	4	Bad packer seal, shaley material in interval tested
City of Gillette		2/1/77	Pump	150	1320	8.8C	3.9x10-4	5	Jacob method on pumped well
					2750	18.3C	2.1x10-4	5	Jacob method on obs. well
		2/14/77	Pump	150	1100	7.3C	3.8x10-3	5	Jacob method on pumped well
					3830	25.5C	2.2x10-4	5	Jacob method on obs. well
Coal
Black Thunder Mine	43/70		Pumped well & recovery		3800			1	Jacob method
			do		5600			1	Jacob method, data skewed
			do		3800			1	Jacob method, data skewed
			do		4400			1	Jacob method, data skewed
			do		4600?			1	Jacob method, data erratic
			do		4500			1	Jacob method, data erratic
			do		450			1	Jacob method, data erratic
			do		32			1	Jacob method, data erratic
			Recovery		100?			1	Jacob method, data skewed
			Recovery		32			1	Jacob method, data skewed
			Recovery		1300			1	Jacob method, data erratic
			Pump & recovery		3400		4.4x1--4	1	Leaky aquifer method
			Pump & recovery		5600		2.5x10-4	1	Theis method, slightly skewed data
			Pump & recovery		650		1.5x10-6	1	Theis method, poor curve fit
					300		6.0x10-4	1	Theis method, better fit than leaky
			Pump		25000		7.0x10-3	1	Jacob method, slightly skewed data
			Pump		750		2.0x10-3	1	Jacob method
Bell Ayr Mine	48/71	---	Pump & recovery	62	1353		0.01	2	Excessive drawdown after 1 hr. at 1 gpm
		---	Pump & recovery	60	3542		3.8x10-3	2
		10/6/76	Slug	80	>1000	>13C	---	3	Complete recovery <3 min.
		10/6/76	Slug	20	4.5	0.2C	~4x10-5	3
		10/6/76	Slug	20	5.3	0.3C	~0.4	3
		10/27/76	Slug	2	>256	>128C	---	3	Complete recovery 2 min.
East Gillette Mine	50/71	10/22/76	Pump	---	---	---	---	4	Near "clinker"
				100	361	3.6C	3.5x10-5
				104	441	4.2C	8.8x10-3
		10/12/76	Pump	---	---	---	---	4	Recharging image well effects
				105	13	0.12C	1.4x10-3
				105	63	0.60C	1.2x10-3
		11/3/76	Pump	---	---	---	---	4	Recharging image well effects
				94	8730	93C	0.33
				100	1420	14C	5.8x10-3		Average of two obs. wells
		10/29/76	Pump	100	392	3.9C	1.2x10-3	4
		8/7/76	Pump	80	1421-815	---	7.3x10-4	4	Analyzed for anistropy
		10/25/76	Slug	20	74	3.7C	0.01	4
		10/25/76	Slug	20	1	0.05C	1x10-3	4
		10/26/76	Slug	20	165	8.3C	2x10-4	4
		10/26/76	Slug	20	106	5.3C	1x10-4	4
		10/26/76	Slug	20	5	0.25C	1x10-4	4
		10/26/76	Slug	20	12	0.60C	1x10-3	4
"Clinker"
East Gillette Mine	50/71	1/19/76	Pump	14	---	---	---	4	Pumped well in coal/ clinker
				14	>8500	>610C	~0.16		Obs. well in coal
				15	200	13C	~0.35		Obs. well in coal
		10/22/76	Pump	---	---	---	---	4	Pumped well in coal
				104?	---	---	---		Obs. well in clinker, no drawdown
				104?	974	9.4C	---		Obs. well in clinker
				100	361	3.6C	7.8x10-4		Obs. well in coal/clinker
Wasatch Formation
Highland Mine	36/72	---	Core analysis	23	516C	22.5	---	4
		---	do	22	412C	18.7	---	4
		---	do	23	340C	14.8	---	4
		---	do	31	768C	24.8	---	4
		---	do	25	366C	14.7	---	4
		---	do	15	274C	18.3	---	4
		---	do	24	554C	23.1	---	4
Belle Ayr Mine	48/71	---	Pump & recovery	100	6175	62C	1.8x10-3	2
		---	do	54	3495	65C	5.4x10-3	2
		10/6/76	Slug	20	93	4.7C	~0.20	3
		10/6/76	Slug	10	82	8.2C	~0.04	3
East Gillette Mine	50/71	12/6/76	Slug	20	38	1.9C	3x10-3	4	Shaley zone tested

Notes:
^a "pump" indicates existence of observation wells; "pumped well" indicates no observation wells.
^b C indicates table entry is derived by calculation from other, reported values.

Date Sources:

1 - Bergman and Marcus, 1976 2 - Davis, 1975 3 - Davis and Rechard, 1977 4 - Wyoming Department of Environmental Quality mine plan files 5 - Wyoming Water Development Commission files 6 - Lowry and Cummings, 1966 7 - Whitcomb and others, 1966 8 - Whitcomb and Morris, 1964

Table Source:

Feathers, K.R., Libra, R., Stephenson, T.R., and Eisen, C. 1981. Occurrence and characteristics of ground water in the Powder River Basin, Wyoming. Laramie, WY: University of Wyoming, Water Resources Research Institute. pp. 111-114.

Appendix C.5
Middle Tertiary Aquifer

Table C.5.1 Specific Capacities of Wells Completed in Middle Tertiary Aquifers of The Powder River Structural Basin, Northeast Wyoming River Basins Plan Area, Wyoming

Location	Completion Date	Total Depth (ft)	Test Duration (hrs)	Yield (gpm)	Drawdown (ft)	Specific Capacity (gpm/ft)	Remarks
CONVERSE COUNTY
34/67-8	7/-/62	415	3	10	75	0.13	Flowing well
NIOBRARA COUNTY
32/64-13 ac	-/-/47	122	24	30	---	---	"Zero" draw-down
32/64-13 ac	-/-/-	145	24	200	41	4.9
32/64-13 bd	-/-/80	100	48	20	10	2.0
32/64-14 db	8/26/77	140	6	25	40	0.62
32/64-18 bd	-/-/-	78	36	135	---	---	Drawdown: "none"
32/64-18 bd	-/-/49	110	?	1000	14	71.	Whitcomb (1965)
32/64-24 da	-/-/55	59	?	650	2.8	232.	Whitcomb(1965)
32/65-1 bc	-/-/-	200	?	125	4	31.	Whitcomb(1965)
32/65-1 cb	-/-/50	108	?	350	14	25.	Whitcomb (1965)
32/65-13 ac	-/-/-	260	12	90	10	9.0
32/65-13 ac	-/-/-	70	1	30	---	---	"Total" draw-down
33/65-17 dc	-/-/59	225	?	5	20	0.25	Whitcomb (1965)
33/66-17 da	12/18/59	100	2	40	---	---	"Zero" drawdown
33/67-25 ab	11/10/74	268	1	9	?	---
34/63-26 ca	-/-/-	150	?	7	15	0.47	Whitcomb (1965)
34/64-9 ac	-/-/52	100	?	6	4	1.5	Whitcomb (1965)
34/64-9 db	11/8/47	130	12	10	40	0.25
34/66-25 db	2/23/67	85	120	25	2	12.5
35/65-28 dd	5/29/77	98	0.25	10	60	0.17

Data Source: Data from Wyoming State Engineer's Office permit files unless otherwise specified under "Remarks."

Table Source:

Feathers, K.R., Libra, R., Stephenson, T.R., and Eisen, C. 1981. Occurrence and characteristics of ground water in the Powder River basin, Wyoming. Laramie, WY: University of Wyoming, Water Resources Research Institute. pp. 120-122.

To the Northeast Wyoming River Basins Water Plan