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San Joaquin County Motor Pool Facility March 6, 2001 <br /> Supplemental Contamination Assessment Workplan <br /> The geologist will use a Photoionization Detector (PID) to screen the soil samples in the <br /> field for the presence of volatile organic compounds (VOC's) and to select soil samples for <br /> laboratory analyses. Samples retained for laboratory analysis will be collected in 1'/2-inch <br /> diameter by 6-inch long steel sleeves capped with Teflon lined polyethylene caps, properly <br /> labeled and immediately delivered to the on-Site mobile laboratory under chain-of-custody <br /> protocol. <br /> Groundwater samples will be collected from each boring using a new disposable <br /> polyethylene bailer which will be lowered inside the hollow-stem auger string to static <br /> groundwater. Prior to sample collection, the depth to groundwater will be measured using <br /> j a water level indicator (Solinst or equivalent). To allow collection of enough sample to fill <br /> all sample containers at the same time, approximately two feet of water column will be <br /> allowed to-collept ins�the bottom of the hollow-stern"a er string, Thi } rggt re ;— <br /> lifting the hollow-kstem` auger string to allow groundwater Wenter and' col ect inside the <br /> auger string. <br /> T I collecte arriple will be transferred ftorr�-t}ie bailer t ppfopriate laboratory)s plied <br /> s mplej con al er using bottom empt ing device wh ch Iminimizes the loss 4f olotlle <br /> c n it is - a pies'collected I VO analyses imill have t eir respective con inlers <br /> fil ed c pletely ith a convex meni use las to eli in, to any rapped air or heads ate. <br /> p P <br /> T e of ected groundwater samples will � properly Labeled an immediately delivered .to <br /> t e on+ a rno4e laboratory under chain f- ustody protocol_ <br /> The drilling Old Oaii piing equip rr ent will egontaminated betwe n lea�h sampling intery I <br /> and between borinh locations to minimi e jthe possibility ofr ckossticontamination. S i <br /> cuttings and deconta In ion water will b stored in Departmenttof Transportation (DOT <br /> approved 55 gallorr drum until waste cha acterization profiling cah be cf mpleted. <br /> Task 3: Laboratory Analyses <br /> Soil and groundwater samples will be submitted to a State Certified on-Site mobile <br /> laboratory for immediate analysis. The soil and groundwater samples will be analyzed for <br /> Total Petroleum Hydrocarbons as Diesel (TPH-D) and TPH-G using EPA Method No. <br /> M8015 and for BTEX, MTBE, tert-Butanol (TBA), Di-Isopropyl Ether (DIPE), Ethyl-tert- <br /> Butyl Ether (ETBE), and tert-Amyl Methyl Ether (TAME) using EPA Method No. 8260B. <br /> Task 4: Report Preparation <br /> Upon completion of the field work a report will be prepared by TEM. The report will <br /> summarize field activities and will include soil boring logs, site maps showing the boring <br /> locations, figures illustrating the vertical and lateral extent of soil and groundwater <br /> impacted by fuel hydrocarbons, tables summarizing soil and ground-water analytical data, <br /> conclusions based on generated data, recommendations for further assessment work, if <br /> necessary. <br /> i <br /> Page 4 of 5 <br /> N� <br />