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f-:A AEGIS ENVIRONMENTAL, INC. STANDARD OPERATING PROCEDURE RE: MEASURING LIQUID LEVELS USING WATER LEVEL OR INTERFACE PROBE SOP-12 ui used far liquid level gauging typically includes the measuring probe Field equipment ht filters , and product bailer(s). The field kit also includes (water level or interface), lig { )spray bottles, and deianized water) to be used in cleaning supplies (buckets, TSP, sp Y cleaning he equipment between wells. point, the probe cord (or halyard) is Prior to measurement,the probe tip is lowered into he well until it touches uottom. Using the previously established top-of-casting (TOC) a e (graduated in hundredths of a foot) is used to determine marked and an measuring tap This the distance between the probe end and the marking on to cord.r (DW)measurement is then retarded on the liquid level data sheet as the dept round When using the interlace probe tc measure liquid levels, the probe is fi. When no rst electrically grounded to either the metal stove pipe or anotherobtainedetal object by clipping ythe ground Bead to is available, reproducible measurements can e the top of the well the handle of he interface probe case. After grounding the probe, ith the casing is fitted with a light filter to insure that sunlight dost�en lowered intointerfere of the owell aand g tical mechanisms. The probe p of the p��obe's optical in to indicates that the probe is submerged in the groundwater, An oscillating (beeping) in water. The probe is slowly raised until either he h{coilVaat g tone and r the DTV a steady tone. 1n either case, this is the cly steaones hydrocarbons. In measurement is made accordingly. The the steady Itonleaceases.tl This is the depth-to- this case, the probe is slowly depth-to- raised product (DTP) indicator and the DTP measurement is made accordingly. N The recess of lowering and raising the probe must be repeated several times to ensure Process product ' to measurements. The DTW and D7P measurements respondsen a the liquid accurate level data sheet. When floating product edu duct-water interface to confirm the product on bailer is lowered partially through the p articularly in cases the water surface, and as further indication measof uorementduct hs recorded on the data sheet where the product layer is quite thin as product thickness (PT). In order to avoid cross contamination of wells during i the liquid w erelsuch information is proce�„ wells are measured in the order of clean available). In addition, all measureme beforepuse betweenment is nmeas�ure TSP solution respect! thoroughly rinsed with diet a of he days use. ve wells and at the comp Ai fACHMENFISCP-17/June 195C 1-c Mill „Is