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_ L AEGIS ENVIRONMENTAL, PRINC. STANDARD OPERATING l WATER LEVEL OR INTERFACE PROBE RE: MEASURING LIQUID LEVELS USING SOP-12 typically includes the measuring probe Field equipment used for liquid-level gauging typ y The field kit also includes (water level or interface), light filter(s), and product bailer(s). z F claQ;,i;,5 supplies (buckets, TSP, spray bottles, end deionized water) to be used in cleaning the equipment between wells. l ; Prior to measurement,the probe tip is lowered into the well until it touches bottom. Using the previously established top-of-casting (TOC) point, the probe cord (or halyard) is marked and an measuring tape (graduated in hundredths of a foot)is used to determine 1 the distance between the probe end and the marking on the cord. This measurement is depth to water (DTW). then recorded on the liquid-level data sheet as the dep ( y Ithe probe is first electrically i When using the interface probe to measure liquid levels, grounded to either the metal stove pipe or another metal object Hearne around gleed to is available, reproducible measurements can be obtained by clipping g l -ml the handle of the interface probe case. After grounding the probe, the top of the well casing is fitted with a light filter to insure that sunlight does not interfere with the operation 7. of the probe's optical mechanisms. The probe tip is then lowered into the well and m tone indicates that the probe is t 1 submerged in the groundwater. An oscillating (beeping) in water. The probe is slowly raised un ils the t oscillating water indicator tone s and r becomes DTW i l a steady tone. 1n either case, thisdepth-to measurement is made accordingly. The steady tone indicates floating hydrocarbons. In this case, the probe is slowly raised until the steady tone ceases. This is the depth-to- - roduct (DTP) rement is made accordingly indicator and the DTP measu , p The process of lowering and raising the probe must be repeated several times to ensure accurate measurements. The DTW and DTP measurements are recorded on the liquid .. leve! data sheet. When floating product is indicated by the probe's response, a product bailer is lowered partially through the product-water interface to confirm the product on ,$, ; the water surface, and as further indication of product thickness, particularly in cases where the product layer is quite thin. This measurement is recorded on the data sheet as product thickness (PT). 4 - l-measurement- - - - - --- in order to avoid cross contamination-cf-wells-during-the_ garelsuctl reformation s 4 process, wells are measured in the order of clean to dirty ( L i available). In addition, all measurement equipment is cleaned with TSP solution and thoroughly rinsed with deionized water be5e use, between measurements in respective ,. wells and at the completion of the day's 4 { ATTTACHMEN7/50P•12IJunn 1990 ,.