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AEGIS ENVIROMENTAL' YNC. ... STANDARD OPERATING PROCEDURE+ i4ATER-L� TEL OR INRFACE: pROBB RE: MEASURI% LIQUID T,.-WLS USIHO SOP-12 w or liquid-level gauging icail includes face) ► Field equipment used ftight filter(s) , the measuring probe (water-level ar inter •- product bailer(s) . The field skit also includes cleaning and P spray bottles, and deionized water) supplies (buckets, TSP, sp Y used in cleaning the equipment between wells. �. is lowered into the well until E Prior to measurement, ..he probe tip established top-0--casting it touches bottom. Using the previously is marked and an measuring (TOC} point, the probe cord (or halyard) �. raduated in hundredths of a foot) is usedontohdee�eo determine eThis tape (g distance between the probe end and the marking 1 data sheet as the measurement is then recorded an the liquid-level depth to water ( the probe when using the interface probe to measure liquid levels, is first electrically grounded to either the roundl stove available another metal object nearby. When nc g in the ground clipping reproducible measurementsef the interfac obtainedcan be probe case. After grounding lead to the handl is fitted with a light filter the probe, the top of the well casing the to insure that sunlight does sno Z'h�probe tiprfere lis then operation into the probe's optical mechanism roundwater. An oscillating the well and submerged in the , robe is t water. The probe is (beeping) tone indicates that the p tone ceases or becomes slowly rased until either the oscillating is the depth-to-water a steady tone. In either case, The steady indicator and the D' measurement drocax ons. In accordingly. this case, pr -toos tone indicates floating Y tone ceases. This is the depth slowly raised until the steady product (DTP) indicator and the DTP measurement is made accordingly. The process of st he repeated lowering and raising the probe mu several times to ensaccurate measurements• The eand DTP ensu. measurements are rrecorded on the liquid level data shheeet. When product indicated by the prots's response, a product r floating p partially through the product further interface to f bailer is lowered g and as further indication t confirm the Product on the water surface, of product thickness, particularly in cases where the product layer is quite thin.Th s measurement is recorded on the data sheet as ' product thic . k _ In order to avoid cross contamination 0 mwells scared an during order oaf level measurement process, wells In "clean" to "did �^Y11 (where such information is available) . all measurement equipment is cleared with TSP solution addition, rinsed with deionized watar before use, between - and thoroughly .a