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0 Shell Exploration & Production <br />FED EX Tracking # 7973 5669 1894 <br />December 17, 2013 <br />Ms. Sarah Roberts <br />US EPA Region 8 <br />UIC Technical Enforcement Program <br />Mail Code: 8ENF -UFO <br />1595 Wynkoop St. <br />Denver, CO 80202 -1129 <br />Shell Frontier Oil & Gas Inc. <br />3333 Highway 6 South, M1074A <br />Houston Texas 77082 -3101 <br />DEC 18 't113 <br />GRAND N,; !S r , OFD OFFICE <br />T" & <br />SAFETY <br />SUBJECT: Logs — Area of Review (AOR) Well LHW 8118, and; <br />Shell Frontier Oil & Gas Inc., UIC Area Permit No. <br />4th Quarter 2013 Subsidence Monitoring Report, <br />County, Colorado. <br />Dear Ms. Roberts: <br />%90, <br />4**J <br />C032210- 00000, al of <br />ERDD Project, Rio lanco <br />As required by PART IV. Of UIC Permit C032210- 00000, Shell Frontier Oil & Gas Inc. ( SFOGI) <br />is submitting the Cement Bond Log (CBL) for AOR well LHW 8118. In addition per the <br />requirements of Appendix D -3 of the above referenced UIC permit the subsurface subsidence <br />monitoring report for the 4rth quarter of 2013 is also included. The report includes radioactive <br />marker log data dated November 27, 2013 for wells OB02 and OB04 and an interpretation of <br />the log. <br />Based on the interpretation of Senior Petrophysicist Engineer, Nilesh Kadam, it is SFOGI's <br />interpretation that the information in the reports provided meet the applicable requirements for <br />the test and log performed and help demonstrate the integrity of the wells to provide the <br />isolation necessary to prevent interaction between the process injection zone and water - bearing <br />zones. <br />The radioactive marker log demonstrate that no subsidence has taken place post leaching <br />operations. SFOGI will perform a similar set of monitoring logs for the 1St calendar quarter of <br />2014. <br />If you have any questions regarding the information in this submittal, please contact me at 281- <br />544 -7990. In addition, Nilesh Kadam can be reached by email at: Nilesh.Kadam @Shell.com <br />Sincerely, <br />Florentino Vuelvas <br />Staff Environmental Engineer <br />ERDD_U I C_Q42013_OB02_04_CBL8118 <br />