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Shell Exploration & Production <br />FED EX Tracking # 7705 5096 6767 <br />July 9, 2014 <br />Ms. Sarah Roberts <br />US EPA Region 8 <br />UIG'Te hnical Enforcement Program <br />Mail Code: 8ENF -UFO <br />1595 Wynkoop St. <br />Mail Code 8P -W -GW <br />Denver, CO 80202 -1129 <br />j o <br />e�f � �� D 0 7- <br />Ashell Frontier Oil & Gas Inc. <br />3333 Highway 6 South, M1074A <br />Houston Texas 77082 -3101 <br />RECEIVED <br />�UL 11 2014 <br />GRAND JUNCTION FIELD OFFICE <br />DIVISION OF <br />R£CIAMATION MINING & SAFETY <br />SUBJECT: Shell Frontier Oil & Gas Inc., UIC Area Permit No. CO32210- 00000, Submittal of <br />2nd Quarter 2014 Subsidence Monitoring Report, ERDD Project, Rio Blanco <br />County, Colorado. <br />Dear Ms. Roberts: <br />Per the requirements of Appendix D -3 of the above referenced UIC permit, Shell Frontier Oil & <br />Gas Inc. (SFOGI) is submitting the subsurface subsidence monitoring report for 2nd quarter <br />2014. The report includes radioactive marker log information dated June 6, 2014 for wells <br />OB02 and OB04. <br />The analysis of the radioactive marker logs indicate that no subsidence has occurred post <br />leaching operations. <br />If you have any questions regarding the information in this submittal, please contact me at 281- <br />544 -7990. <br />Sincerely, <br />Florentino Vuelvas <br />Staff Environmental Engineer <br />Attachments (2) <br />ERDD — UIC cover letter — 2nd qtr 2014 subs mon report 1 <br />