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r" <br /> Sec. 10-1, Construction Details <br /> Std. Spec.Sec 13 <br /> Special <br /> Page 7 of 9 <br /> 1 <br /> 3.06 SOIL GAS WELL INSTALLATION <br /> A. General <br /> 1 Well installations shall be coordinated with EHD inspector. <br /> 2 Contractor shall place items specified in the construction drawings and in <br /> these specifications in the presence of the EHD inspector. <br /> 3 Any boring that collapses during well installation shall be re-drilled to the <br /> specified depth at no additional cost to the County. <br /> B. Probe Pipe Installation <br /> 1 Insert each probe pipe carefully in the well borehole. <br /> 2 Do not bend the probe pipe or make any kinks. <br /> 3 Probe pipes shall be in tension at all times and shall be to a near-straight <br /> position in the borehole. The straightness of the probe pipe can be <br /> checked by shining a flashlight in the borehole. <br /> 4 Maintain probe pipe identification. <br /> C. Backfilling <br /> 1 Measure the depth of the well drilled from surrounding grade in the <br /> presence of the Engineer and EHD inspector before backfilling. <br /> 2 The depth and length of the pea gravel sampling zones may be adjusted <br /> by the Engineer based on geologic data obtained during drilling. <br /> 3 Remove any loose vegetation from the area of the borehole. Do not allow <br /> any organic materials into the borehole. <br /> 4 Place backfill materials in a controlled manner to avoid bridging, <br /> overfilling the boring, or damaging the probe pipes. <br /> 5 Confirm with the Engineer the required depths of sampling intervals. <br /> Periodically measure depths of pea gravel backfill from the existing grade <br /> level with a weighted measuring tape. <br /> 6 Measure the final top pea gravel sampling interval depth of each pipe <br /> probe from surrounding grade with a weighted measuring tape in the <br /> presence of the EHD inspector and the Engineer. <br /> 7 Measure the top depth of each bentionite plug from surrounding grade <br /> with a weighted measuring tape in the presence of the EHD inspector and <br />