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16 APPENDIX A <br /> FIELD PROTOCOL <br /> i <br /> The static water level and floating product level, if present, in each well that contained water <br /> was measured with an ORS Interphase Probe Model No 1068018 or Solonist Water Level <br /> Indicator, these instruments are accurate to the nearest 0 01 foot These groundwater <br /> depths were subtracted from wellhead elevations, including corrections for product <br /> thickness, when necessary, for gradient evaluation by multiplying product thickness (PT) by <br />' a correction factor 0 8 and subtracting from the DTW (Adjusted DTW= DTW- [PT x 0 8]) <br /> Water samples collected for subjective evaluation were collected by gently lowering <br /> approximately half the length of a new disposable or Teflon® bailer past the air-water <br /> interface (if possible) and collecting a sample from near the surface of the water in the well <br /> The samples were checked for measurable floating hydrocarbon product All Teflon® <br /> bailers are triple washed with Alconox®and triple rinsed with distilled water prior to use <br /> Before water samples were collected from the groundwater Monitoring Wells, the wells <br /> were purged until stabilization of the temperature, pH, and conductivity were obtained <br /> Approximately three well casing volumes were purged before those characteristics <br /> stabilized The quantity of water purged from each well was calculated as follows <br /> 1 well casing volume = Tceh(7 48)where <br /> r--radius of the well casing in feet <br /> h=column of water in the well in feet <br /> (depth to bottom -depth to water) <br /> 7 48=conversion constant from cubic feet to gallons <br /> Gallons of water purged/gallons in 1 well casing volume = well casing volumes removed <br /> • <br /> SN�TH <br />