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I MW-8 2 MW-6 3 MW-5 4 MW-4 5 MW-7 ' To sample each well, a teflon bailer was attached to new nylon line and lowered into the well by hand The bailer was filled, brought to the surface and the water was carefully poured into laboratory prepared glass and plastic bottles and capped with teflon- lined caps Samples were labeled with stick-on labels filled out in indelible ink, with the following information Site name Date collected Time collected ' Sample ID Sampler's initials Analysis required ' Quality control/quality assurance procedures consisted of the collection of a blind duplicate and an equipment decontamination ansate sample The duplicate was collected concurrently with ' Sample MW-7 and was given the fictitious well/sample name MW-10 The decontamination sample (labeled MW-11) was collected from a bailer which had been cleaned by the normal decontamination procedure De-ionized water was poured into the decontaminated bailer and then the water was poured from the bailer into the sample bottles This sample serves as a check on the decontamination procedures for the bailer, ensuring that it has been effectively cleaned ' Samples were placed with ice in an insulated chest for delivery with a chain-of-custody document to the WESTON Analytics' laboratory in Stockton, California This laboratory is certified by ' the State of California to perform the required analyses Samples were submitted for analysis by EPA Method 8015 (Modified) for total petroleum hydrocarbons as gasoline (TPH-G), EPA Method 8015 (Modified) for total petroleum hydrocarbons as diesel (TPH-D), EPA Method 7421 ' for total lead, EPA Method 8020 for benzene, toluene, ethylbenzene and xylenes (BTEX) and EPA Method 504 for ethylene dibromide (EDB) The equipment decontamination sample and the duplicate scheduled for analysis of only BTEX (Table A-4) Decontamination and Health and Safety Procedures edu es ' All devices used to purge the wells and collect the water samples (including bailers, pumps, purge lines, etc ) were decontaminated prior to the first use and between used for each sampling The pump that was used to purge the wells was decontaminated by inserting it into a barrel containing an alconox-water mixture The pump was then turned on and allowed to pump the alconox-water mixture through the pump and purge lines The exterior of the pump and associated lines were also washed at this time The bailer was decontaminated by washing it in an alconox-water mixture with a stiff bristle brush, rinsing it with potable water and giving it a final spray rinse with distilled water The new, thin nylon line used to lower the bailer into the well was disposed of after each use SMWTSWC IST WP A - 3 0511 RM