Laserfiche WebLink
Soil Vapor Work Plan Addendum <br /> California Tank Lines, Inc.,3501 South El Dorado Street, Stockton,California <br /> Page 2 <br /> Soil vapor points will be constructed by advancing 4-inch diameter Geoprobe MacroCore <br /> sampler to approximately 5-feet bgs. Following ry(noval of the MacroCore®, Teflon tubing fitted <br /> with a porous media and inserted into a 1-inch diameter PVC casing, will be lowered to the total <br /> borehole depth. Approximately 1-foot of sand// ill be placed on top of the screen through the PVC <br /> casing and added as the casing is removed,dllowing the sand evenly distribute in the borehole. <br /> Approximately 1-foot of dry bentonite�pellets will be added on top of the sand through the PVC <br /> casing. The PVC casing will be removed from the borehole and additional bentonite will be added <br /> to approximately 3-inches bgs and slowly hydrated. After sampling the tubing will be removed and <br /> the top of the borehole filled and patched to match the surrounding surface. WRM will wait at least <br /> 30-minutes after well construction to allow for subsurface equilibrium. <br /> For each soil vapor sample, the system will be purged of approximately three system volumes <br /> prior to sampling to ensure that a representative soil vapor sample is collected. Immediately prior <br /> to sampling, a tracer gas will be applied to the sampling tubing at ground level and to the fittings to <br /> check seal integrity. The tracer gas will be included in the analytical suite to verify soil vapor <br /> sample reliability. Each soil vapor sample will be collected in laboratory provided containers at a <br /> flow rate of 100 to 200 milliliters per minute. <br /> Upon completion of the field sampling activities, the samples will be immediately transported to <br /> Torrent Air Toxics, LTD.(CA NELAP - 02110CA) in Folsom, California, for analysis of the TPH-G, <br /> BTEX, MtBE, DIPE, EtBE, TAME, TBA, and 1,2-DCA by EPA Method TO-15 and TPH-D by _ <br /> NIOSH Method 1550. <br /> Scheduling and Reporting <br /> Upon approval of this work plan and submission of the boring permit, WRM will schedule the soil <br /> i vapor sampling. Based on historical data and the results of the soil vapor survey and sensitive <br /> receptor survey, Taber is prepared to conduct the survey on Monday, June 15, 2009. <br /> If you have any questions or concerns, please call us at (916) 371-1690. <br /> Sincerely, <br /> Taber Consultants <br /> Martin A. Wills, REA I <br /> Project Manager <br /> SAL <br /> I � C <br /> Thomas E. Ballard, P.G. a THWASE.IAlL1ED <br /> Senior Geologist iF No. 72qq <br /> F CAI�Fo� Taber Consultants <br /> Engineers and Geologists <br /> i <br /> PI <br />{{y <br />