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buffild <br /> hydrocarbon impact will be submitted for laboratory analysis. Soil samples submitted for laboratory <br /> analysis will be collected in stainless steel tubes, capped with Teflon TM, labeled, entered onto a <br /> chain-of-custody form, packed on ice, and sent to BC Laboratories, Inc., (BC Lab) of Bakersfield, <br /> California. <br /> 5.7 Laboratory Analysis <br /> Soil samples submitted to BC Lab for laboratory anaylsis will be analyzed for the following: <br /> • TPHg by EPA Method 8260B <br /> • Benzene, toluene, ethylbenzene, and total xylenes (BTEX) by EPA Method 8260B <br /> • Methyl tertiary butyl ether(MTBE), tertiary butyl alcohol (TBA), ethyl tert-butyl ether(ETBE), <br /> diisopropyl ether(DIPE), ethylene dibromide (EDB), 1,2-DCA, tertiary amyl methyl ether <br /> (TAME), ethanol, and naphthalene by EPA Method 8260B <br /> All soil samples will be analyzed on a standard turnaround time. <br /> 5.8 Decontamination <br /> Reusable downhole drilling and sampling equipment will be decontaminated before each use. The <br /> decontamination station will include a self-contained wash bin, steam cleaner, and holding tank to <br /> decontaminate equipment. All equipment will be decontaminated with a pressure washer and <br /> scrubbed with Alconox. Decontamination water will be stored onsite in 55-gallon drums and <br /> managed as described in Section 5.9. <br /> 5.9 Investigation Derived Waste Disposal <br /> Soil cuttings, decontamination rinsate, and groundwater generated during field activities will be <br /> temporarily stored onsite. Soil and water will be segregated and placed in Department of <br /> Transportation compliant 55-gallon drums, labeled, and stored in a designated area onsite. The <br /> drums will be sampled for waste characterization and transported to an approved facility for disposal <br /> following receipt of analytical results. <br /> 5.10 Monitoring Well Development and Survey <br /> After a minimum of 72-hours after installation, the newly installed monitoring wells will be developed <br /> using a combination of groundwater surging and extraction to dislodge fine sediments from the sand <br /> pack and remove sediments from the well. Surging and extraction will continue until at least ten <br /> well casing volumes of groundwater are extracted and sediment volume in the groundwater is <br /> negligible. The wells will be surveyed by a California state licensed surveyor. <br /> 5.11 Groundwater Sampling <br /> Following monitoring well installation, development, and surveying, the wells will be added to the <br /> existing groundwater monitoring and sampling schedule and sampled on a semi-annual basis. Prior <br /> to collecting groundwater samples, at least three well casing volumes of groundwater will be purged <br /> and groundwater pH, conductivity, and temperature parameters have stabilized. Groundwater <br /> GHD I Well Installation Work Plan Addendum 111193145(5)1 Page 5 <br />