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w _ R r d i i e ..- AEGIS ENVIRONMENTAL, INC. STANDARV OPERATING PROCEDURE wNG LiGIUI©1-EVES USING WATER LEVEL OR INTERFACE PROBE RE: MEASUR- SOP-'12 ' icall Or the measuring probe 5 The Meld kit also includes Field equipment used for liquid-Ievei gauging tyR y (water-level Or inteiface), light filter(s), and product baller{s). supplies {buckets, TSP, spray bottles, and deionized water) to be used in cleaning pp cleaning the equipment between wells. is lowered into the well until if touches bottom. sthe Prior to measurement,the probe tip i e Wellhead vault) the reviausiy established top-of-casing or top-at-box ((graduated in hundredths of a R _ probe cord (Or halyard) is marked and a measuring tape g and the used to determine the distance between ethe U robe ed� sheet asthe "depth to foot) This measurement is then recorded on tri q i water (DTW). robe is first electrically the p When no ground When using the interface probe to measure ther�metaa)Is ohle cinearby.trie ground lead to grounded to either the metal Is pip the probe. the top of the well is available, reproducible measurements Aft be ounding the clipping with the operation the handle of the interface probe Case and �. . casing is fitted with a light filter to insure heat sunlight t A se then lowerred int Otthe wi is n of the probe's optical mechanisms. probe tone indicates t probe submerged in the groundwater. An Oscillating (beeping) tone ceases or becomes a TW water. The probe is slowly raisedeh stili i the the oscillating indicator d�ocarbanthe Q steady tons. In either Cas 1 The steady tone indicates floating y th-to- measurement is made accordingly. tone Ceases- this is the dep i this case, the probe is slowly raised until the steady product (DTP) indicator and the DTP measurement is mads accordingly. robe must be repeated several times to ensure The process of lowering and raising the p probe's response, a proc!Jct S meng The ()TW and DTP measurements o e recorded on the liquid accurate measure roduct is Indicated by t P prod on level data sheat. When floating p articularly,,'•n cases bailer is lowered partially through the ps of araduct thickness, ter in confirm the p sheet the water surface, and as further indication s where the product layer is quite thin. This measurement is recorded on the;rJata as "product thickness." • ontamination of wells during the liquid-level r,ieasurement In order to avoid cross C " where such`information is process, wells are measured in the order Of"clean"to "dirty — ment is cleaned — �i solution and Ila V3 . In-addition.-allm.easurementfoegeuuse-between-measuremen s in resile ive ova ) rinsed with delonized water ba thoroughly completion of the day's use. r' ri wells, and at the 1 J_l - 121JUNE199Y � _ 1 _ ATTACHMENTIS '. '¢1 1