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�� h-5-.. �LL OM1' •++. m Ni' ,� � �r �e.4E', � f. .Y during field activities as described in Quality Assurance/Quality Control section of this work plan to maintain accuracy. Water quality measurements will be made as follows: o The beaker used to collect the purge water obtained during well sampling will be rinsed with sample water prior to filling. O Probes will be thoroughly rinsed with distilled water prior to measurement, immediately submerged in the beaker, and then measurements taken. o All field measurements will be recorded on the field data sheet and field memos along with the sample location, time, date and initial water elevation. o After measurements are made, the beaker and probes will be decontaminated by rinsing with distilled water. o Water obtained during well development will be placed in -- a baker tank or other appropriate container for onsite treatment through biodegradation or other recognized treatment process. The general monitoring well sampling procedures are as - follows: o Check all equipment to ensure that it is properly decontaminated. o Determine the static nater level as described above. o Calculate the volume of water in the casing based on the static water level, well depth, ;-rd well diameter. o Prior to sampling, excavate each well by pumping with a centrifugal or submersible pump, or bailer. Measure - temperature, pH, and electrical conductivity during the excavation period using portable field meters calibrated with bottled standards. After the first well volume is removed, measure these parameters once per minute until the measurements stabilize. A minimum of three casing volumes will be excavated prior to sampling. if conductivity, temperature znd pH have not stabilized - after five well volumes, a sample will be taken. o store and treat purged water onsite in a baker tank using biodegradation or other recognized treatment process. hD01.064 7