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