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• 4.10.3 WATER CONTROL MEASURES <br />Detailed designs for the Southfield coal refuse stockpile include adequate drainage <br />control measure to ensure the stability of the permanent refuse pile and protect the <br />hydrologic balance. Water control measure designed and implemented for the <br />refuse stockpile include the following: <br />- Subdrainage system <br />- Surface water collection and drainage ditches <br />Detailed designs for these drainage control facilities are presented in Exhibit 15, <br />Minor and Technical Revisions, Exhibit 18, Geotechnical Investigations and Exhibit <br />19, Drainage and Sediment Control Plan. <br />Subdrainage System <br />In order to provide for effective drainage from the stockpile foundation, Dorchester <br />• constructed primary and secondary subdrains extending under the existing refuse <br />stockpile. Two (2) separate subdrains were installed to <br /> <br />4.10-3a Revised 5/15/97 <br />Technical Revisan No. 27 <br />