DSHW-2018-004302 - 0901a0688081be54

DSHW-2018-004302 195 North 1950 West • Salt Lake City, UT
Mailing Address: P.O. Box 144880 • Salt Lake City, UT 84114-4880 Telephone [phone] • Fax [phone] • T.D.D. [phone]
www.deq.utah.gov Printed on 100% recycled paper
State of Utah
GARY R. HERBERT Governor SPENCER J. COX Lieutenant Governor
Department of
Environmental Quality
Alan Matheson Executive Director DIVISION OF WASTE MANAGEMENT AND RADIATION CONTROL Scott T. Anderson Director
May 16, 2018
L. Chase Fortenberry
Senior Remediation Project Manager Georgia-Pacific LLC 133 Peachtree Street, NE Atlanta, GA 30303
RE: GP Gypsum 2017 Groundwater Monitoring Report Georgia-Pacific, Former Gypsum Manufacturing Facility 200 South State Street (Utah Highway 24), Sigurd, Utah EPA ID # UTD009073354

Dear Mr. Fortenberry: The Division of Waste Management and Radiation Control has completed its review of the subject report. The Division agrees with the conclusions that active remediation to address groundwater
impacts appears to not be warranted and that avoidance of future exposure risks can be assured through appropriate land use restrictions. Based on this assessment all site monitoring wells, except for MW-7, should be properly abandoned in accordance with Utah Administrative Code R655-4-14. As for MW-7, please note that the non-cancer
naphthalene screening level concentrations at the monitoring well are forecasted to not drop below the
95 percent upper confidence level around the Theil-Sen trend line any time soon. Therefore, the Division will require that another groundwater sample be collected at MW-7 for VOCs in 2021, in order to verify the predicted trend as presented in the report. If, in 2021, MW-7 naphthalene concentrations do not increase above the 2017 concentrations, the Division will consider a termination of sampling at the
well.
At this time, Georgia-Pacific will need to put in place the appropriate land use restrictions mentioned above. Please prepare a draft Site Management Plan and Environmental Covenant for the site, which requires sampling of MW-7 for VOCs in 2021 and further prohibits utilizing site groundwater as a
drinking water source. Please submit these documents, along with a groundwater monitoring well
abandonment plan, to the Division at your earliest convenience. (Over)

If you have any questions, please call Helge Gabert at [phone].
Sincerely,
Scott T. Anderson, Director
Division of Waste Management and Radiation Control
STA/HG/km c: Sue Hilderbrand, MSN, Health Officer, Central Utah Public Health Dept.
Nathan Selin, Environmental Health Director, Central Utah Public Health Dept.
John Chartier, P.E., DEQ District Engineer Eric Baiden, DWMRC (Email) Greg Council, Tetra Tech, Atlanta Mike Egan, Tetra Tech, SLC