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Western Water ! L- It"i '. <br /> SLI <br /> June 29,2020 <br /> Ms.Amy Yeldell <br /> Environmental Protection Specialist <br /> Colorado Division of Reclamation,Mining and Safety <br /> 1313 Sherman Street,Room 215 <br /> Denver,CO 80203 <br /> Mr.Scott Hall <br /> Realty Specialist <br /> U.S.Bureau of Land Management,GJFO <br /> 2815 H Road <br /> Grand Junction,CO 81506 <br /> RE: Analytical Results and Recommendation for Retort Mine Water Spill at Logan Wash <br /> Mine(Permit No.M-1977-424) <br /> Dear Ms.Yeldell and Mr.Hall: <br /> Western Water& Land, Inc. (WWL), as agent for Occidental Oil Shale, Inc. (OOSI),has received the <br /> laboratory analytical results for a soil sample collected at the location of the retort mine water spill that <br /> occurred on May 26t,2020,near Logan Wash Mine(Permit No.M-1977-424).Both the U.S.Bureau of <br /> Land Management(BLM)and the Colorado Division of Reclamation,Mining and Safety(DRMS)were <br /> notified by phone of this spill and formally by letter dated June 8t, 2020. DRMS conducted an onsite <br /> inspection of the spill area on June 18t,2020. <br /> Background <br /> As you may recall,retort water that originates at the mine is conveyed to the Evaporation Pond by way <br /> of a buried 4-to 6-inch polyvinyl chloride(PVC)pipe,which can be accessed by a number of vaults with <br /> cast iron manhole covers. The spill occurred at Manhole 10 (MH-10) as a result of a plug of sediment <br /> and sludge at that location.Retort water spilled from the manhole cover and flowed down the bar ditch <br /> on the south side of Logan Wash Road. The retort valve at the mine was shut-in soon after the leak was <br /> found and the sediment/sludge plug at MH-10 was removed by vac-truck methods; the material was <br /> disposed of properly at the Greenleaf Environmental Services facility in De Beque, Colorado. Soils <br /> potentially impacted by the spill were limited to within the existing bar ditch; an unvegetated area <br /> approximately 280 feet long by 1 to 2 feet wide was wetted by the retort water. <br /> A soil sample of the wetted soils was obtained by collecting several subsamples along the flow path in <br /> the ditch and compositing the samples into one sample that was submitted to the analytical laboratory for <br /> chemical analysis.The laboratory used was ALS Environmental,located in Holland,Michigan.This lab <br /> has been used in the past for analysis of soil samples collected at the mine facilities. Analytes included <br /> "743.11orizo:n Coun Suite 330,Grand junction,CO 811506 <br /> Phone. (970)242...0 70 :F= (970)242...0270 <br />