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<br />. <br /> <br />~\~... <br /> <br />. <br /> <br />. <br /> <br />plan be supported by both the public and the local sponsor and is also compatible with existing <br />laws, regulations, and public policies. Each alternative plan shall include measures to mitigate any <br />effects on environmental, cultural, and social features and values. <br /> <br />The quality control CQC) processes described in the QC Plan will be performed for all work, <br />including an independent quality control review of all products. <br /> <br />2.3 SURVEYING AND MAPPING. The necessary flights and work to begin mapping is <br />assumed to be accomplished in conjunction with the study. Purchase of the mapping and digital <br />terrain model will be an initial step in the feasibility process. Checking of the mapping will be <br />performed by the Government to insure accuracy for usage in the study. Horizontal and vertical <br />control will be to the third order accuracy. The minimum scale of 1" = 200' and two-foot contour <br />intervals will be used for all mapping obtained in the valley area, and five-foot contour interval <br />mapping will be used for the mountain area. The larger scale for mapping is required for detail of <br />work included in the technical appendix to the feasibility study. All topographic mapping will <br />meet National Mapping Standards. Coordinate ji'bsitions of control points will be based on state <br />plane coordinates. <br /> <br />The quality control CQC) processes described 'in the.Q€'Plan will be performed for all work, <br />including an independent technical review of all products. <br /> <br />2.4 GEOTECHNICAL INVESTIGATIONS. This task will be performed by the Government. <br />The investigations Cas described herein) will be performed for Oak creek and the resulting <br />analysis and design recommendations will be documented in an appendix to be attached to the <br />subject report. <br /> <br />a. The publications listed below will be referred to for testing and sampling methods as <br />specified in the text: <br /> <br />U.S. Department of the Army, Corps of Engineers, Engineering Manual: <br />EM 1110-2-1906, Laboratory Soils Testing, 20 August 1986 <br />EM 1110-2-1907, Soil Sampling, 31 March 1972 <br /> <br />American Society for Testing and Materials CASTM) Publications: <br />ASTM D-2487 Classification of Soils for Engineering Purposes <br /> <br />b. Preliminary Investigations. Preliminary investigations will include site reconnaissance <br />and research of available' information such as existing design memoranda for existing projects, <br />Natural Resource Conservation Service publications, geological publications, previous work done, <br />and foundation reports for any existing bridges and buildings. The purpose of the preliminary <br />investigation is to identify factors which may affect alignment and design and cost, and also to <br />obtain any information which could possibly reduce the scope of the required field investigations. <br />The information obtained in the preliminllry investigation will be utilized in the design of the <br /> <br />SECTION B,' PAGE 4 <br />