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APPENDIX D. METHODS AND PROCEDURES, OA/OC This Appendix documents the specific methods, procedures, and materials used to collect and analyze ground water samples and monitoring the vapor recovery system Gauging and Measuring Monitor Wells Prior to sampling a well, WEGE personnel obtain three measurements : the depth to ground water (DTW) and the product thickness using a battery powered depth to water-product interface probe and or by using a specially designed bailer And the vacuum influence at the well head, using a water manometer that is attached to a sample port in the well head. The DTW probe is lowered into the well casing until the instrument signals that the top of water has been reached. The distance from the top of water to the top of casing is read from the tape that is attached to the probe 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 - determine the elevation of ground water with respect to mean sea level . The probe is washed with TSP (Tri Sodium Phosphate) and rinsed in 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 DTW, Depth to Water (from surface reference ie 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 Pur in Standing Water from Monitor Wells If no product is present, WEGE personnel purge the well This is accomplished by removing ground water from the well until the water quality parameters (temperature, pH, and conductivity) stabilize, or until the well is emptied of water Periodic measurements of ground water temperature, pH, and conductivity were taken with a iiy" ieonitvr or o ner meter and recorded along with the volume of ground water removed from the well . Purging is done by one or more methods singularly or in combination. Bailers, pneumatic or electric sample pumps, or vacuum pump tanks or trucks may be used. The usual amount of water removed is three well. vol.mes . The water c oliecced during purging is either safely stored onsite for later disposition, transported to an approved onsite or offiste sewer discharge system, or an approved onsite or offsite treatment system. Z R603 APPEND. D