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Soil Vapor Work Plan Addendum <br /> California Tank Lines, Inc., 3501 South EI 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 r� oval of the MacroCore®, Teflon tubing fitted <br /> with a porous media and inserted into a 1 -inch rameter 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 , . lowing the sand evenly distribute in the borehole . <br /> Approximately 1 -foot of dry bentonitepellets 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 - 0211 OCA) 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 /> I � C <br /> Thomas E. Ballard , P .G . a THWASE. 1AlL1ED <br /> Senior Geologist iF Ny, 7299 <br /> F CAI�Fo� Taber Consultants <br /> Engineers and Geologists <br /> i <br /> PI <br />{{y <br />