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i•� <br /> i <br /> �a <br /> M. <br /> FA <br /> i <br /> ~-� Static water level measurements for each monitoring well will be taken and referenced <br /> to the top of the casing. The wetted tape method or the electric sounder method will <br /> be used to take the measurement to the nearest 0.01 foot. Sounder cable or tape will <br /> be decontaminated before and after use at each well. Soil borings and well locations <br /> �- will be surveyed. <br /> 43.2 FIELD MEASUREMENTS <br /> Electrical conductivity, temperature, and pH measurements will be made during the <br /> collection of each groundwater sample. A pH meter with a combination gel-filled elec- <br /> trode or equivalent will be used for field pH determinations. A combination electrical <br /> conductivity-temperature-salinity meter or equivalent measuring device will be used to <br /> determine the conductivity and temperature. All instruments will be calibrated daily <br /> during field activities to maintain accuracy. <br /> The measurements will be made as follows; <br /> • The cell or container used to collect the purge water obtained during well <br /> sampling will be rinsed with sample water before filling. <br /> • Probes will be thoroughly rinsed with distilled water before measurement, <br /> then submerged in the flow-through cell and measurements taken. <br /> • All field measurements will b-� recorded in the field data sheet notebook <br /> p-= <br /> along with the sample location, time, and date of measurement, <br /> After measurements are made the <br /> probes will be decontaminated by <br /> 4:E rinsing with distilled water. <br /> HNu readings will be taken during field activities as described in the Site Safety PIan <br /> (Appendix A). In addition, the HNu will be used to monitor vapors f,om the drill <br /> cuttings and soil samples. HNu readings will be recorded in the drilling log. <br /> 433 EQUIPMENT DECONTAMINATION <br /> Near the drilling locations, an area will be established for equipment decontamination. <br /> -a Personnel decontamination is addressed in the Site Safety Plan (Appendix A). <br /> The auger and rear portion of the drill rig will be steam-cleaned before drilling each <br /> soil boring. The entire drill rig will be steam-cleaned before it leaves the drill site, if <br /> requested by the field-.hydrologist. Well..casing..and screens will be steam-cleaned be- -- - - <br /> fore they are placed in the wells or will arrive on site already cleaned and wrapped. <br /> All soil and water sampling equipment will be cleaned prior to use, between use, and <br /> before it leaves the site. Cleaning will consist of a detergent wash followed by rinses <br /> 3 , <br /> sF031634%WP0451 4-7 <br /> dr <br />