tuba city open dump - nuclear regulatory commission · tuba city open dump nnepa h.haven 11/07/02...

HOT SPOT

above 100 ug/L Ur an ium

Proposed Moni tor i ngWel l Locat i on

NAV 1 NAV 2NAV 3

NAV 4

> 20 ug/L uranium

Figu

re 3

20

MW 22MW 23

MW 21

MW 17 MW 18

MW 7MW 13D

MW 9D

MW 27

MW 28

MW 11D

MW 14MW 15

MW 3

MW 24

MW 2

MW 4MW 10D

MW 25

MW 5MW 26

0 500 1000

Feet

20

Tuba City Open Dump

NNEPA H.Haven11/07/02

Ground Water Elevat ions

MW 20

MW 1

MW 19

Ceci l Begaye's Hand dug wel l

Baxter

4905

4895

48954894

4868MW 6

MW 8

486648564861

48404798

4856 4859

4903

4888

4827

4828 48374877

4902

4895

48984867

4863

4800

4900

Water Flow Di rect i on

4900

Moni tor ing Wel ls

NAV 5

Note: Uranium concentration unit is in ppb

MW 16

224

MW 7

174MW29

37.1

NAV 7

19.5

MW 19 27.7

MW 1.88

NAV 2 41.9 ?

Note: Uranium concentration unit is in ppb

????

Note: Uranium concentration unit is in ppb

BARRIER NATURAL and to put a barrier

Proposed

MW Location

areas

Upper Conglomerate

Lower Conglomerate

Upper Conglomerate

Lower Conglomerate

Apparent Dip Direction

UMTRA SITE

TUBA CITY, AZ

Water Flow Directions ???

Upper

Lower

What are the cleanup levels? Uranium? Others?

Proposed Locations?

Is there a lining under the site?

Barrier

?

Recommendations:

1) Immediate Barrier–Chemical ? Physical? Stop migration towards Hopi drinking water source.

2) Remediation of Lower Plume at MW 16 and NAV 2 and possible upgradient source

3) Drill upgradient of NAV 7 to ID source

4) Continue sampling of MWs

5) Independently Sample all MWs at UMTRA and water levels (survey elevations and locations

6) Investigate other funding sources

?

Lower Conglomerate