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J 2. To establish top of subgrade grading, provide "point -on point" coordinates and finish grade elevations on a 50 -foot grid and more frequent in irregular areas and along slope grades. 3. Establish stake -out coordinates for the location of each subgrade location for the point -on -point established grid. Subsequent surveys for the verification of the prepared subgrade and subsequent vegetation soil and earthfill layer surface elevations and thickness shall be located at the same point -on -point grid locations, and along LFG pipe trenches and edges of prepared subgrade for geomembrane cover placement, and drainage and operations layers where placed, as outlined in Article 1.04 E.1. 4. Provide one set of offset stakes for the drainage ditches at 25 -foot intervals. SHAW ENVIRONMENTAL, /Nc, San Joaquin County — Extension of Cap Corral Hollow Sanitary Landfill — CH—Closure Cap Ext Proj_Technical Specs -4-19-12 Revl.DocRev. 0, 04/05/2012 ILayout of Work and Surveys 1 01052-3 5. Provide verification surveys on the established point -on -point grid; provide verification surveys for LFG pipe trenches and for drainage take off at flowlines at 25 -foot on center and angle points for future reference and record drawings. Verification surveys shall also be provided along the edge of geomembrane cover placement. 6. The verification survey data for layer surface elevations and the subgrade protection layer, earthfill, vegetative soil layer, and aggregate base thicknesses shall be compiled in tabular format to verify each layer point -on -point grid location surface is within grade tolerance and meets minimum thickness requirements, and shall be submitted to the Engineer for review prior to the placement of the next component. The Engineer shall have up to 5 working days to review the survey data. The Engineer's review does not relieve the Contractor of the responsibility for achieving the specified grades within allowed tolerances and the minimum layer thicknesses. C. Anchor Trench / Liner Limit Survey 1. Stake location of geomembrane cover limit per plan details at 50 -foot on center and angle points. 2. Provide verification survey for geomembrane cover limit location. 3. Survey and calculate the total area on which geosynthetic material was or will be placed. D. Final Soil Layer and Earthfill Soil Layers Survey 1. Upon completion of drainage layer, and subgrade protection layer layer, check layer thicknesses and mark differences on Engineer approved survey markers. SHAW ENVIRONMENTAL, /Nc, San Joaquin County — Extension of Cap Corral Hollow Sanitary Landfill — CH—Closure Cap Ext Proj_Technical Specs -4-19-12 Revl.DocRev. 0, 04/05/2012 ILayout of Work and Surveys 1 01052-3