ARCHIVED REPORTS XR0012481 - Laserfiche WebLink

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ATTACHMENT B FIELD AND LABORATORY PROCEDURES Sampling Procedures The sampling procedure for each well consists of measuring the water level and checking for the presence of separate-phase hydrocarbons (SPH), using either an electronic indicator and a clear Teflon® bailer or an oil-water interface probe Wells not containing SPH are then purged of approximately three casing volumes of water (or to dryness) using a clean centrifugal pump, gas displacement pump, or bailer The equipment and purging method 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 pnor to collecting samples After purging, water levels are allowed to partially recover Groundwater samples are collected using either a clean Teflon bailer or a dedicated submersible pump, 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 Groundwater samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg) and methanol by EPA Method 8015, benzene, toluene, ethyl-benzene, xylenes (BTEX compounds), methyl-tertiary-butyl-ether (MtBE), ethyl-tertiary-butyl-ether (EtBE), di-isopropyl ether (D1PE), tertiary-amyl-methyl-ether (TAME), tertiary-butyl-alcohol (TBA), 1,2-dichloroethane (1,2- DCA), and ethylene dibromide (EDB), and ethanol by EPA Method 8260 The laboratory analytical report and chain-of-custody documentation are presented as Attachment C Purge and Rinsate Water Disposal Water generated during well sampling and equipment cleaning was pumped into a SECOR truck mounted water tank The water was then transferred to the operating GWE system where it was treated and then discharged under permit to the industrial wastewater stream