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October 1, 2004 NOA Project Number: LE03-034 Soil sampling is not proposed and is not applicable to this workplan. ' The ground water sampling criteria are presented next. ' 6.1 QA/QC Procedures QA/QC procedures will be used to mimmie the potential for contaminat on of ground water samples taken from the monitoring wells. The QA/QC procedures include decontamination of the ' sampling pumps,if needed,before sampling,use of one duplicate sample pet day;changing latex nd recording sample information on chaition custody protective gloves after each sampling event, a ' forms. The QA/QC sample may also consist of either a trip blank of cross contamination sample where equipment is reused. ' 6:2 Post Well Development Time A sample of:first encountered ground water will be taken from each monitoring well within.a ' minimum of 48 hours following well development completion. 6.3 Well Purging Method ' A minimum of three (.3) wetted casing volumes of ground water will be purged from the well with a disposable bailer prior to obtaining ground water samples. Three (3) wetted casing volumes in a 2-in diameter well with 1.5 feet of wetted casing is about 2.5 gallons. During the water level measurement and well purging,a specifically designed field.form will be used ' to keep a record of the water level and some physical properties of the purge water. The purge water will be tested once for each casing volume removed for basic water quality parameters including pH, electrical conductivity, and TDS. Our portable water quality meter is a Ultrameter 6P by Myron L. Company, sena] number 616892. The portable meter will require decontamination between wells. The required meter calibration period for pH is every two weeks and for TDS is every month. The well is ready for sampling when all the parameters are within±5 percent on three (3) consecutive readings. 6.4 Water Sample Collection And Preservation Method ' Ground water samples will be taken from the monitoring wells using either disposable bailers of submergible pumps which are decontaminated before and after each sampling event. The ground water samples will be placed in containers with appropriate preservatives. The containers and preservatives will be supplied by a chemical analytical testing laboratory. The ground water samples will then be placed on ice inside an insulated storage chest and transported to a testing laboratory ' within 24 hours of collection. 8 f