WORK PLANS - Laserfiche WebLink

Home Browse Search

borehole was air knifed or hand-augured to evaluate the presence of underground structures or utilities. Once pre-drilling efforts to identify subsurface structures was complete, pre-cleaned drill rods were advanced using a drill rig for the purpose of collecting samples and evaluating subsurface conditions. Upon completion of drilling and sampling, the drill rods were retracted, and the boreholes were backfilled with cement grout. In areas where the borehole penetrated asphalt or concrete, the borehole was capped with an equivalent thickness of asphalt or concrete patch to match finished grade. During the drilling process, a physical description of the encountered soil characteristics (i.e. moisture content, consistency, odor, color, etc.), drilling difficulty, and soil type as a function of depth was described on boring logs. The soil cuttings were classified in accordance with the Unified Soil Classification System(USCS). Soil cuttings were temporarily stored on-site in 55-gallon DOT approved drums pending laboratory analysis, waste profiling, and proper disposal. Labels were affixed to the drums indicating the contents of the drums, date of drilling, and location of site. STANDARD PROCEDURE FOR EQUIPMENT DECONTAMINATION Equipment that could potentially contact subsurface media and compromise the integrity of the samples was carefully decontaminated prior to drilling and sampling. Drill augers and other large pieces of equipment were decontaminated using high pressure hot water spray. Samplers, groundwater pumps, liners and other equipment were decontaminated in an Alconox® (or equivalent) scrub solution and double rinsed in clean tap water rinse followed by a final distilled water rinse. The rinsate and other wastewater were contained in 55-gallon DOT-approved drums, labeled (to identify the contents, generation date and project) and stored on-site pending waste profiling and disposal.