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and water-tight protective vault box will be installed on the top of each well The moni- <br /> toring wells will be surveyed for location and elevation (relative to mean sea level <br /> datum) by a licensed surveyor <br /> Well Development <br /> The groundwater monitoring wells will be developed after installation and prior to the <br /> first sampling event The wells will be developed by pumping until the water removed <br /> from the well is relatively free of sediment <br /> Groundwater Sampling Procedures <br /> Groundwater sampling will be performed using techniques approved by the Regional <br /> Water Quality Control Board. The sampling procedure consists of first measuring the <br /> water level in each well, and checking each well for the presence of separate-phase <br /> hydrocarbons using a clear Teflon bailer If none are detected, the wells will be purged <br /> of a minimum of three to four casing volumes of water (or until dryness) After <br /> purging, the wells are allowed to partially recover prior to sampling <br /> During purging, temperature, pH, and electrical conductivity will be monitored until <br /> stable in order to collect a representative sample Groundwater samples will be <br /> collected using a Teflon bailer and placed into appropriate EPA-approved containers <br /> The samples will be labeled, logged onto chain-of-custody documents, and transported <br /> on ice to the laboratory <br /> Decontamination Procedures and Containment <br /> All augers and downhole sampling equipment will be steam-cleaned between bonngs <br /> Groundwater sampling equipment will be steam-cleaned between wells <br /> Soil cuttings generated during drilling will be placed on plastic sheeting Development <br /> and purge water will be contained in labeled drums at the site Soil samples will be <br /> collected from the cuttings and analyzed to determine appropriate disposal Well <br /> development and purge water will be pumped out of the drums and transported by a <br /> licensed hauler to an approved disposal facility <br /> Laboratory Procedures <br /> Selected soil samples from the well borings and groundwater samples from all wells will <br /> be analyzed in the laboratory for the presence of total petroleum hydrocarbons calcu- <br /> lated as gasoline (TPH-g), and benzene, toluene, ethylbenzene and xylenes (BTEX <br /> compounds) Analysis will be performed by the purge-and-trap technique with final <br /> 3104001\WORKPLN C-2 August 6,1993 <br />