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C. Review of submittals by the County does not relieve the contractor of responsibility to follow the contract specifications, nor does it relieve the contractor from responsibility for errors or omissions in the submittal. Allowed deviations from the contract specifications, if any, will be specifically and explicitly identified in writing by the County. D. Contractor shall submit proposals for substitutions to the Engineer, and shall obtain approval of those substitutions before proceeding with those substitutions. PART 3 - EXECUTION I. General All work shall be in accordance with applicable regulatory requirements. Work may not start until the work crew is in possession of project design documents, provided by Contractor. A. LFG System Shut Down Contractor shall not shut down the LFG systems without consent of the Engineer. Contractor shall provide minimum of 48 hrs written notice for any need LFG system shutdown and the duration of the shutdown to the Engineer. Engineer will notify San Joaquin Valley Air Pollution Control District(AQMD) before approving any shutdown request. B. Labeling Label well heads, valves, and valve boxes with oil-based paint indicating well number. Clean surfaces prior to painting. Labeling shall be neat and professional in appearance II. LFG Wells Placement of rock, pipe, and other materials in the well bore—collectively referred to as "Installation of the LFG well"- shall be in the presence of EHD. M. Abandoning Boreholes Notify the Engineer if an obstruction prevents the advance of the drill rig. The Engineer may direct the Contractor to abandon the borehole, and drill a replacement borehole. Placement of material within the abandoned borehole shall be in the presence of EDH staff. A. Abandoned boreholes in refuse: place soil within the borehole, moistening the soil and compacting in 2-ft lifts. FH-LFG Well Installation GX-2A 7 Revised 6-14-11