ARCHIVED REPORTS XR0002734 - Laserfiche WebLink

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i S E C O R ATTACHMENT B FIELD AND LABORATORY PROCEDURES Sampling Procedures Sampling equipment is thoroughly cleaned prior to each sample The sampling procedure for each well includes measuring the water level and checking for the presence of liquid-phase hydrocarbons (LPH), using either an electronic indicator and a clear Teflon® bailer or an oil-water interface probe Wells not containing LPH are purged of approximately three casing volumes of water (or to dryness) using a clean submersible pump, centrifugal pump, gas displacement pump, or bailer The equipment and purging methods used for the current sampling event are noted on the attached field data sheets During purging, temperature, pH, and electrical conductivity are monitored in order to document that these parameters are stable prior to collecting samples After purging, water levels are allowed to partially recover Groundwater samples are collected using a clean Teflon@) bailer, placed into appropriate EPA-approved containers, labeled, logged onto chain-of-custody documents, and transported on ice to a California state- certified laboratory Laboratory Procedures The groundwater samples are analyzed for the presence of TPHg, benzene, toluene, ethylbenzene, xylenes (total), and MtBE using EPA Methods 8015 (modified)18021 or 82606, and fuel oxygenates using EPA Method 8260B The methods of analysis for the groundwater samples are documented in the certified laboratory analytical reports The certified laboratory analytical reports, chain-of-custody documentation, and field data sheets are presented as Attachment B Purge and Rinsate Water Disposal Water generated during well sampling and equipment cleaning is pumped into a SECOR truck-mounted water tank The water is then pumped through the on-site groundwater extraction system for treatment and disposal i