Laserfiche WebLink
' Page 3 <br /> Traffic-proof, flush mounted steel well covers will be placed over each well to <br /> provide protection and ensure future access to the well. <br /> All PVC materials will be cleaned with a high-pressure, hot-water washer prior <br /> to being installed to the drive holes <br /> 1 � <br /> BOREHOLE GROUTING <br /> On completion of soil and water sampling, boreholes will be abandoned with a <br /> grout mixture of Type 11 cement with 4% pure sodium bentonite The grout will be <br /> pumped through a 1-inch-diameter grouting tube positioned at the bottom of the <br /> boreholes, prior to withdrawing the outer rods <br /> SOIL VAPOR SAMPLING <br /> Soil vapor samples will be collected using probes constructed of 1 0"-outside- <br /> diameter, 0 80"-inside-diameter stainless steel pipe with expendable steel drive <br /> points The probes are either pushed or vibrated into the ground in three-foot <br /> threaded sections When the prescribed depth is reached, the probe is pulled <br /> ' up to expose the desired sample interval, leaving the expendable tip in place <br /> The top of the vapor probe is then coupled to a Tedlare bag YAthin a sealed <br /> vacuum box using 914"-diameter Teflon tubing. The vacuum box is evacuated <br /> with an electric or hand vacuum pump, allowing the sample bag to tall with soil <br /> vapor from the sample interval A minimum of one probe volume <br /> (approximately 6 cubic inches per vertical foot of probe) will be purged from the <br /> ' probe before a sample is collected <br /> Once the sample is collected, soil vapor probes are removed from the ground <br /> with the sampling rig The resulting hole is then abandoned with a cement- <br /> bentonite grout <br /> 1 <br /> ffwkeMpro&)c <br />