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�: -A 4 Decontamination I tr;i Friar to commencing sampling or purging, all bailers, pumps, tubing, cables, And Ifncs willbe decontaminated. Decontamination will include trisodium phosphate wash, tap water rinse, and deiomzed water final rinse. A bailer blank will be taken after initial decontamination is performed. The bailer blank is obtained by filling the bailer with deionized water and t ransferring ¢ the water into appropriate containers. The sample is to be labelled"Bailer Blank" and"Flold" is to he indicated in the analysis sections of the label and the Chain-of-Custody record. All t.., equipment will be thoroughly decontaminated after sampling each well. i Gauging The water I-vel in cacti well will be gauged prior to purging. 4n oillwatcr interface probe will be used to determine the depth to water, depth to product, and total well depth. 'flte data �., collected will be recorded on the Groundwater Monitoring Data form. The interface probe and tape will be decontaminated prior to gauging each well. Purging The well will be bailed or pumped to remove at least three well casing volumes prior to sampling or until the pH, temperature, and conductivity have stabilized. "Stabilized is defined asnd condu three consecutive readings within 15 percent of one another. Temperature,pH,, y � . be measured with field instruments after each well casing volume is removed. The data will be recorded on Purge Data form. A casing volume will be based an actual measurements made on the day of sampling. If the well is purged dry before three well casing volumes are removed, the sample will be taken when thv water level in the well recovers to S0 percent of its initial water level. If the length of time for the well to recover 80 percent of its initial water level exceeds two hours, the sample will be obtained as soon as sufficient volume is available. All water purged from the well will be placed in labelled,55-gallon,closed-top drums. Sampling uired volume from well, the sample will be obtained with a Following the removal of the req clean, tclIon or stainless steel bailer. All samples will be logged on the Chain-of-Custody record form. Samples will be placed in appropriate containers provided by the laboratory. Labels name, projec 'Me number, date, sample identification, sampler, and analytical specifying project affixed, r each sample container. e samples will be placed in a cooler with parameters will be nam dry or blue ice for delivery to the analytical laboratory. 3.5 Sampling Schedule �. Periodic sampling of the monitoring wells may become necessary. Sampling will be addressed in _.. after the mitia: investigations. the-remedial action pl.ut which will be-prepared. Steffen Robeaw and KiMe- t