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i <br /> 1 <br /> 2.0 GROUNDWATER MONITORING WELL SAMPLING METHODOLOGY <br /> 2.1 Groundwater Measurements <br /> ' <br /> Depth to groundwater measurements were made using a Slope Indicator Company, water <br /> P <br /> level indicator Model No 51.453 The depths were measured from the top of the surveyed <br /> ' well casings Groundwater measurements from September 29, 1992, January 25, June 30, <br /> and September 15, 1993 are presented in the following table <br /> ' GROUNDWATER MEASUREMENT DATA <br /> ' Well Date Elevation Depth to Elevation of <br /> Number Measured Top of Casing Groundwater Groundwater <br /> (ft-MSL) (ft) (ft-MSL) <br /> MW-1-P 9129/92 2545 7641 -5096 <br /> 1/25/93 7644 -5099 <br /> 6/30/93 73 96 -4851 <br /> ' 9/15/93 75 04 -4959 <br /> MW-2-P 9/29/92 25 65 76 33 -50 68 <br /> ' 1/25/93 75 93 -5028 <br /> 6/30/93 73 60 -47 95 <br /> 9/15/93 7489 -4924 <br /> MW-3_p 9/29192 2505 75 11 -5006 <br /> 1125/93 7549 -5044 <br /> 6/30/93 7311 -4806 <br /> 9/15/93 7420 -49 15 <br /> MSL - Mean Sea Level <br /> ' 2.2 Monitoring Well Purging <br /> ' Each monitoring well was purged with a 4-inch submersible pump until at least three <br /> equivalent well volumes of water had been removed All purging and sampling equipment <br /> was washed in an Alconox solution and rinsed with distilled water prior to each usage to <br /> ' reduce the potential for cross contamination between wells As groundwater was removed <br /> from the wells, pH, temperature and conductivity were monitored and recorded on a field <br /> data sheet These field documents are kept in a permanent project file The wells were <br /> ' allowed to stand for a period of time to regain equilibrium prior to sampling Groundwaters <br /> purged from the wells were placed in DOT-approved 55 gallon drums Once the drums <br /> analytical results are evaluated, the drum contents will be disposed of using proper methods <br /> and protocol <br /> 500713 2 <br /> 1 I <br />