Water-Resources Investigations Report 98-4184
Version 1.1
November 2008

Table 1. Characteristics of monitoring wells in Oasis Valley, Nevada

[All depths are in feet below land surface unless otherwise indicated. Abbreviation: n.a., not applicable]
Drilling method—AH, air hammer; MR, mud rotary; MR-AH, mud rotary and air hammer
Land-surface altitude and measuring-point altitude—Altitudes were surveyed from nearby benchmarks
Inside casing type—PVC, schedule-40 or schedule-80 polyvinyl chloride; CS, schedule-40 carbon steel
Screen type—SS, 304 stainless steel; PVC, schedule-40 polyvinyl chloride

Well name

USGS site identification number1

Latitude (degrees, minutes, seconds)

Longitude (degrees, minutes, seconds)

Date well completed

Site number

Number of wells at site2

Drilling method

Land- surface altitude (feet above sea level)

Measuring-point altitude (feet above sea level)

ER-OV-01

370504116404901

370504

1164049

08-04-97

01/06

3

AH

4,007.3

4,009.79

ER-OV-02

370210116421501

370210

1164215

08-20-97

02

1

MR

3,880.3

3,883.01

ER-OV-03a

365956116421601

365956

1164216

08-22-97

03a

3

MR

3,844.4

3,847.12

ER-OV-03a2

365956116421602

365956

1164216

09-12-97

03a

3

MR

3,843.8

3,845.54

ER-OV-03a3

365956116421603

365956

1164216

09-12-97

03a

3

MR

3,843.8

3,845.59

ER-OV-03b

370139116390501

370139

1163905

09-29-97

03b

1

MR

4,232.6

4,234.60

ER-OV-03c

365948116360401

365948

1163604

09-18-97

03c

2

MR-AH

4,191.5

4,194.34

ER-OV-03c2

365948116360402

365948

1163604

09-26-97

03c

2

MR-AH

4,191.9

4,194.97

ER-OV-04a

365705116424201

365705

1164242

10-11-97

04

1

MR

3,491.4

3,493.69

ER-OV-05

370246116461901

370246

1164619

08-02-97

05

1

MR

3,937.8

3,939.14

ER-OV-06a

370504116404902

370504

1164049

08-09-97

01/06

3

AH

4,007.5

4,009.48

ER-OV-06a2

370504116404903

370504

1164049

08-11-97

01/06

3

AH

4,007.0

4,009.28

Well name

Well depth (feet)

Borehole

Well casing

Open interval

Borehole depth (feet)

Average diameter, below surface casing (inches)

Surface casing depth (feet)

Inside casing diameter (inches)

Inside casing type

Screen type

Top and bottom of screened interval (feet)

Top and bottom of filter pack interval (feet)

ER-OV-01

180

180

6.75

n.a.

2.5

PVC

SS

150-170

142-180

ER-OV-02

200

200

6.75

n.a.

2.5

PVC

SS

170-190

160-200

ER-OV-03a

251

251

6.75

n.a.

2.5

PVC

SS

220-240

198-251

ER-OV-03a2

642

821

6.75

40

2.5

PVC

SS

602-622

560-655

ER-OV-03a3

133

821

6.75

40

2.0

PVC

PVC

113-133

88-160

ER-OV-03b

395

400

8

40

4.0

CS

SS

353-373

272-400

ER-OV-03c

542

542

6.75

40

2.5

PVC

SS

512-532

496-542

ER-OV-03c2

321

321

6.75

32

2.5

PVC

SS

292-312

270-321

ER-OV-04a

151

151

6.75

n.a.

2.5

PVC

SS

111-131

89-151

ER-OV-05

200

200

6.75

n.a.

2.5

PVC

SS

170-190

136-200

ER-OV-06a

536

536

6.75

n.a.

2.5

PVC

SS

506-526

488-536

ER-OV-06a2

65

71

6.75

n.a.

2.5

PVC

SS

56-65

44-65

1 The standard site identification is based on the grid system of latitude and longitude. The number consists of 15 digits. The first six digits denote the degrees, minutes, and seconds of latitude; the next seven digits denote degrees, minutes, and seconds of longitude; and the last two digits (assigned sequentially) identify the sites within a 1-second grid. For example, site 370504116404901 is at 370504" latitude and 1164049" longitude, and it is the first site recorded in that 1-second grid. The assigned number is retained as a permanent identifier even if a more precise latitude and longitude are later determined.

2 Multiple wells at a site are clustered within 30 feet of each other and screened at different depths. With the exception of wells ER-OV-03a2 and ER-OV-3a3, which are nested within the same borehole, multiple wells at a site are emplaced within individual boreholes.