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I

M. ARCADISInfrastructure, environment, facilities

Gary Janosko, Deputy Director,Fuel Facility Licensing DirectorateDivision of Fuel Cycle Safety and SafeguardsU.S. Nuclear Regulatory CommissionWashington D.C. 20555

Subject:

Groundwater Monitoring Results; Second Half 2007Docket No. 40-8102License No. SUA-1139Highland Reclamation Project

ARCADIS

14142 Denver West Parkway

Suite 350

Golden

Colorado 80401

Tel 303.231.9115

Fax 303.231.9571

www.arcadis-us.com

Dear Mr. Janosko:

Pursuant to the semiannual reporting requirements of Materials License No. SUA-

1139, Conditions 22 and 33, attached are the semiannual environmental monitoring

results covering the Highland Reclamation Project for the period July 1, 2007 to

December 31, 2007.

This report was prepared on behalf of ExxonMobil by ARCADIS.

A summary of the groundwater elevation data is found in Attachment 1. Summaries

of the water quality data are found in Attachment 2. Monitoring locations are shown

on the map in Figure 1. Sampling of environmental media other than groundwater is

not required by the Materials License and was not performed as part of this report.

Date:

March 18, 2008

Contact:

Rebecca Lindeman

Phone:

303.231.9115 x123

Ernail:

Rebecca.Lindeman@arcadis-us.com

Our ref:

B0085721.0002

Static groundwater levels (Attachment 1) show no significant changes in groundwater

elevations over the ,course of the second half of the calendar year 2007.Groundwater quality data (Attachment 2) shows no significant changes inconcentrations of monitored parameters over the course of the second half of the

calendar year 2007.

Monitored parameters in the Tailings Dam Sandstone (TDSS) groundwater

compliance wells were within groundwater protection standards during the secondhalf of 2007. The groundwater protection standards are defined by Condition 33 ofthe Materials LicenseWhich was modified in 2006,! via license amendment"58 ".

"•p.

Imagine the result

ARCADIS Mr. JanoskoMarch 2008

Please feel free to contact Ms. Rebecca Lindeman, ARCADIS, at 303.231.9115 ext123 or Dan Burnham with ExxonMobil at 713.534.6200 if you have any questionsregarding this submittal.Sincerely,'

ARCADIS

Rebecca Lindeman, P.E.Principal Civil Engineer

Copies:

Dan Burnham - ExxonMobilDave Roberson - de maximis, inc.

4

I)Page:

2/2GACOMMOW'~57.21 E-En HighA~'.dAIRC GWV RepoftsOJD HALF 200A0108A1 187,1.dw

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CRAfIC SCALE

EXXONMOBIL HIGHLAND MINE SITECONVERSE COUNTY, WYOMING

NRC SAMPLING REPORT, 2nd HALF 2007

GROUNDWATER AND PIT LAKESAMPLE LOCATION MAP

AR A S FIGUREf2 ARCADIS I I-•-

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Attachment 1Second Half of 2007 Water Level Data

ExxonMobilHighland Mine Site

U15 I UM L)I NA DRY DRY

112 TDM VII 5188.8 5120.50 5126.28

114 TDM IX 5243.53 5100.53 5100.02

116 TDM XI 5243.41 5057.33 5056.97

117 TDM XII 5265.35 5119.05 5119.80

120 TDM XXI 5224.82 5114.16 5112.82

125 TDM XXVI 5171.3 5122.47 5121.00

127 TDM XXVIII 5203.6. DRY DRY

128 TDM XXIX 5203.8 5069.46 5070.90

129 TDM XXX 5226.36 5062.78 5062.54

134 RM-4 5158.7 5124.40 5124.36

148 TDM XXXII 5112.9 DRY DRY

171 XXXVIII 5205.3 5043.30 5048.50172 EM-5 5272.09 5080.89 5080.19173 TDM XXXIX 5241.09 5065.05 5064.92174 TDM XL 5380.39 5083.19 5083.44175 TDM XLI 5259.6 5106.30 5106.00176 TDM XLII 5452.5 5310.86 5310.37177 TDM XLIII 5264.19 DRY DRY178 TDM XLIV 5277.14 5113.14 5113.44179 TDM XLV 5295.7 5113.16 5113.10180 TDM XLVI 5324.39 DRY DRY181 TDM XLVII 5237.7 5116.80 5116.50182 TDM XLVIII 5240.4 5112.96 5112.73183 TDM XLIX 5301.4 5105.00 5105.04

Notes:NA = Not applicable.

G:\COMMON\857.21 - Exxon Highland\NRC GW Reports\2ND HALF 2007\010811873.xls Page 1 of 1

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Attachment 2Second Half of 2007 Water Quality Data

ExxonMobilHighland Mine Site

I

-,173 TDM)O(XIX

180 TOM XLVI

116 T TOM A

.129 ITOM

78TODM XXWI

134,RM4

172 ;EM-5

174 TOmXL'

'182 TDM XLVIII

ýý15 TOM XXVI

175 M XLI

I 178 ,TOM XLII

17?, TDM XLIII

.015 TDM DR

4. /12 'TDMVI0

TOM IXJ•.".114 {•D IX

117 TDM XII

120 TDM XYJ

127 TDM XXVII

178 TOM XLIV

181 1D XLVI

,Y1183 1 TOM XLIX

A~lao~it Comnl.44fi- Limits (ACLI epply:W6111425 U-nat =0.088 444nL' W.11175 Ni-1 8.ng&L nd R.226-.R228 .25 pCIL

Bold Res ult ~cseade Groun4dwaers Prtelsuien Standardn.J -Enlfinseled celu.rn9/L MiliIgra40 par literNS =!4t sanpled

qvLII =Pico-ur.e p4 liter.

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