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-; use of excavated soil. All undisturbed on-site soils will be <br />suitable for daily or intermediate cover, unless hazardous <br />materials are encountered. Should the Operator encounter hazardous <br />materials during excavation, the CDPW shall be notified <br />. immediately. <br />The Operator may be required to excavate and place soils for liner <br />sideslope protective operations layers, and construction of roads. <br />The Countv will provide specifications for such materials and the <br />required field engineering for placement. In addition, the County <br />may direct the, Operator to perform selective stockpiling of soil <br />with specific engineering properties. <br />3.5.2 Excavation Grade Control <br />The County will supply three bench marks with information on <br />horizontal and vertical control. The bench mark information will <br />include the horizontal grid coordinates and the elevation (U.S.G.S. <br />datum) to the nearest hundredth foot. The Operator shall use these <br />bench marks for control of all excavation grade control. <br />The Operator will provide survey stakes to guide excavation based <br />on the grading plans and bench marks supplied by the County. The <br />Operator will be responsible for the accuracy of the land surveys <br />3 and setting of the grade stakes. The Operator shall be responsible <br />for performing the excavation to within 0.5 feet within of the <br />-- grades specified by the County. <br />The County may perform periodic verification surveys to check the <br />accuracy of the grade stakes. <br />The Operator shall provide the CDPW with field notes of excavation, <br />grade stake setting, and control according to specification called <br />out in Section 12, Survey Work. <br />• 9 <br />