Laserfiche WebLink
r <br /> APPENDIX A <br /> PROTOCOLS FOR WELL DRILLING,COMPLETION, <br /> DEVELOPMENT,AND SAMPLING <br /> A.1 DRILLING AND SOIL SAMPLING <br /> The boreholes were drilled with a B-61 truck-mounted rotary rig using W-inch outside diameter <br /> hollow-stem,continuous-flight augers. The boreholes were drilled 20 feet below static water <br /> level. <br /> t <br /> All augers,sampling rods,samplers,and downhole equipment were steam cleaned before drilling <br /> and between each new well. All drill cuttings were piled on a plastic sheet and covered with <br /> w Plastic on-site,waiting for the results of chemical analysis and appropriate disposal if necessary. <br /> Logs of drilling and the borehole were recorded by an EA gcolog:st overseeing the drilling <br /> operations and well installation. The boring logs are signed and dated and contain detailed <br /> ( `~� geologic information,including descriptions of the soils classified according to the Unified Soil <br /> Classification System, blow counts,OVA readings,moisture content of the soils,and initial and k <br /> static water levels. <br /> A.2 SOIL SAMPLING <br /> ' During drilling soil samples were collected at 5-foot intervals and at any substantial changes of <br /> soil type,beginning at 10 feet below grouted surface,with a 2-inch-diameter, 18-inch modified ' <br /> California split-spoon sampler containing three 6-inch brass liners. The sampler and liners were <br /> t <br /> scrubbed in deionized water and Alconox detergent and rinsed with deionized water after use at <br /> 3 each sampling interval. Soil samples were collected to the total depths of the boreholes. <br /> e <br /> At each sampling depth,the sampler was driven 18 inches ahead of the drill augers into undis- <br /> turbed soil. Typically after the sampler was opened,either the lowermost or tYuddle sample liner <br /> was retrieved,and the ends of the tube covered with aluminum foil and sealed with plastic caps. <br /> The soil-filled liner was labeled with the location, sample number,date,time,depth,sampler, <br /> I and borehole number. The samples were placed in zip lock bags and stored in a cooler contain- <br /> ing ice. <br /> s ice' The remaining soil was.removed from the other two liners and scanned with a Foxboro Century <br /> 128 organic vapor analyzer(FID). OVA readings are noted on the logs. The soils were de- <br /> + scribed and classified according to the Unified Soil Classification System. <br /> C : <br /> i <br /> WM942/bdWi A-1 <br /> 'r <br /> OEM WININE111M I ROOM <br />