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<!-- RRD ActiveDisclosure(SM) XBRL Schema Document - http://www.financial.rrd.com/ -->
<!-- Creation Date      : 2015-08-10T18:01:10.4691361+00:00 -->
<!-- Version            : 2.0.9.1 -->
<!-- Package ID         : F4D56D6C069E8FFCE294CB86F04B3EBE-0000868725-001506 -->
<!-- Copyright (c) 2015 R. R. Donnelley & Sons Company. All Rights Reserved. -->
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  <element id="rtk_StockholdersEquityNoteChangesInCapitalStructureSubsequentChangesToNumberOfCommonSharesAuthorized" name="StockholdersEquityNoteChangesInCapitalStructureSubsequentChangesToNumberOfCommonSharesAuthorized" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="rtk_CommonUnitsExchangePricePerShare" name="CommonUnitsExchangePricePerShare" type="num:perShareItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <element id="rtk_DebtExpectedToBePaid" name="DebtExpectedToBePaid" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="credit" />
  <element id="rtk_PrecedingPeriodToValueStock" name="PrecedingPeriodToValueStock" type="xbrli:durationItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="rtk_PercentageOfStockDiscount" name="PercentageOfStockDiscount" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="rtk_PercentageOfPrepaymentPremium" name="PercentageOfPrepaymentPremium" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="rtk_StockExchangedDuringMerger" name="StockExchangedDuringMerger" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" xbrli:balance="debit" />
  <element id="rtk_PercentageOfCommonUnitPriceWithCallRight" name="PercentageOfCommonUnitPriceWithCallRight" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="duration" nillable="true" abstract="false" />
  <element id="rtk_DebtInterestRateFloor" name="DebtInterestRateFloor" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
  <element id="rtk_PercentageOfStockHoldingToNominateDirector" name="PercentageOfStockHoldingToNominateDirector" type="num:percentItemType" substitutionGroup="xbrli:item" xbrli:periodType="instant" nillable="true" abstract="false" />
</schema>


