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t PROTOCOL FOR SAMPLING WELLS WITH DOWN HOLE PUMP - GROUNDWATER MONITOR WELLS _ I Gauging and Measuring Monitor Wells Prior to sampling the wells, WEGE personnel obtain three measurements for each well The depth to groundwater(DTW), The product thickness using a battery powered depth to water-product interface probe and/or by using a specially designed bailer, The total depth of casing, to calculate the total water volume in the well The DTW-product interface probe is lowered into the well casing until the instrument signals when the top of free phase floating product(if present)and/or the top of water is reached The distance from the top of free phase floating product and/or water to the top of casing is read from the tape that is attached to the probe The probe is then lowered to the bottom of the well and the tape is read again The tape is calibrated in 0 01-foot intervals for accuracy to 0 01 foot The measured distance is subtracted from the established elevation at the top of casing to deterrmne the elevation of groundwater with respect to mean sea level The difference between the top of groundwater and the base of the well is noted to establish water volume in the well The probe and tape is washed with TSP(Tn Sodium Phosphate)and rinsed with distilled water before each measurement WEGE has designed and built bailers that will collect a sample of the contents of a well to show the exact thickness of any floating product Some of the abbreviations used in water sampling and or measuring or monitoring are BGS,Below Ground Surface, DTW, Depth to Water(from surface reference s e usually TOC), TOC, Top of Casing, MSL, Mean Sea Level, AMSL and BMSL, Above and Below MSL, BS, Below Surface, TOW, Top of Water, TSP, Tri Sodium Phosphate Purging Standing Water from Monitor Wells 2 Purging Wells If no product is present, WEGE personnel purge the well by removing groundwater until the water quality parameters (temperature, pH, and conductivity) stabilize, or until the well is emptied of water Periodic measurements of groundwater temperature, pK and conductivity are taken'with a Hydac Monitor or other meter and recorded along with the volume of groundwater removed from the well Purging is done with a down hole electric sample pump The pump is lowered into the well to a position approximately two feet below the top of water in a 4 inch well and 5 feet below the top of