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Shell Exploration & Production <br />FED EX Tracking # 7993 1038 4759 , _ k <br />March 19, 2013 <br />Ms. Wendy Cheung <br />US EPA Region 8 <br />1595 Wynkoop St <br />Mail Code 8P -W -GW <br />Denver, Colorado 80202 -1129 <br />Dear Ms. Cheung: <br />RECEIVED <br />MAR 272013 <br />Division of Reclamation, <br />Mining & Safety <br />Shell Frontier Oil & Gas Inc. <br />3333 Highway 6 South Blvd. <br />Houston, TX 77082 -3101 <br />RECEIVED <br />MAR 14 2013 <br />GRAND JUNG Ivty rICLL) OFFICE <br />DIVISION OF <br />RECLAMATION MINING & SAFETY <br />SUBJECT: Additional Info on Request for Authorization to Inject <br />UIC Permit C032210 -0000 <br />Shell Frontier Oil & Gas Inc, Oil Shale RDD Lease (COC 69166) <br />SECTION 35, T1 S, R99W, RIO BLANCO COUNTY, COLORADO <br />Dear Ms. Cheung: <br />This letter is to provide EPA additional information, as requested, on Observation Well OW8124 <br />(SAW1). <br />Below is a list of the attachments: <br />• Isolation Scanner and Cement Inspection Log <br />• Executive Summary of Evaluation <br />• Compact Disc with electronic copies <br />All tests and logs demonstrate that Underground Sources of Drinking Water (USDW) are <br />protected. <br />The information has been reviewed by Senior Petrophysicist Engineer, Nilesh Kadam. <br />If you have any questions regarding the information in this submittal, please contact Florentino <br />Vuelvas at (281) 544 -7790. In addition, Nilesh Kadam can be reached by email at <br />Nilesh.Kadam @Shell.com. <br />Sincerely,,/ <br />George K. Zimmerman <br />�t Land Adm' istration <br />Attorney i Fact <br />Follow -up info 03192013 C032210 -00000 request fo!�Authorization to Inject_EPA.docx <br />