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[:b AEGIS ENVIRONMENTAL, INC- STANDARD OR INTERFACE PROBE . STANDARD OPE u®UID LEVELS USING TING PROCEDURE WATER-LEV RE: MEASURING SOP-12 typically includes the measuring probe Field equipment used for liquid-levet gauging bailer(s). The field kh also includes (water-level or interface), light filter{s), and product lies buckets, TSP, spray bottles, and deionized water) to be used in cleaning Supp' { cleaning the equipment between wells. hint, the probe cord (or halyard) is ing Prior to measurement,the Probe tip is lowered into the well until it touches bottom. Us the previously established top-of-cast+ng C1' P �, (graduated in hundredths of a toot)is used to determine marked and an n1easurir .ape (g e cord. the distance between tha probe end and thea the depth to water This measurement is then recorded on the liquid-level data sheet robe is first electrically the p When using the interface probe to measure liquid levels, ect nearby. When no ground c!i in the ground lea.t0 grounded to eithed�c b eemeasurem�ents can be obtainedal bby pP g of the well is available, repro the probe, the top the handle of the interface pro be�su�e thae. ttsun fight dog not interfere with toperation elland casing is fitted with a light filter to of the probe's optical mechanisms. The probe Pthen tone indicates that the probe is submerged in the groundwater. An oscillating (beeeping) tar and be ti3T s in water. The Probe is slowly raised until ei ieerdtehpth tolwater t indicator or becomes tone. In either case, this is hydrocarbons. In a steady The shady tone indicates floating measurement is made accordingly• tone ceases. This is the depth to- this case, the probe is slowly raised until the steady product (nTP) indicator and the DTP measurement is made accordingly.,mes to ensure the robe must be repeated severs The process of lowering and raising P 's response, a e liquid ants The ©TW and DTP measurements are recorded on the liquid accurate measurements. the P level data sheet. When floatict ng product is indicated by lowered Partially through the product-water interface to confirm the product on bailer is and as further indication of product thickness, particularly in cases the water surface, the product Payer is quite thin. This measurement is recorded on the data sheet where as product thickness (PT). ° r "dirty" (where such informatior.is In ordTSP solution er to avoid cross contamination of wellanduring the liquid-level mcasurementd process, wells are measured in the order of"clean" In addition, all m_ easuremen.t. equipment icleaned with gri s in respective avaiiable)• nized water before between mea thoroughly rinsed with deioofthe day's s use.-wells_and at the completion SOP-42/0ct. 1990