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�i _i`t7 - ��r, �ra.�ro.r-7 `� ��;� aS � "o:=`. ��r ,r.P'-C�• x§_..� 3 A��.�- w -.�'..s. s��k`S:i�k�i:,a4. A�' ' y AEGIS ENVIRONMENTAL, INC. STANDAnD OPEFIAT114G PROCEDURE RE: FAEASURING LIQUID LEVELc USING WATER LEVEL OB INTERFACE PROBE SOP-12 FiCd oquipment O'Jed for fiquid-tevel gaurjintj typically inclurlc, Iter mors: r;nr} proba (water tevel or interface), l:rht Nter(s), and product ba0er(O. 'Ilse field k+t arca is c!udes cleaning supplies (buckets, TSP, spray bottles, and deionized viater) to tie a asci in cleaning th€: Cqupment belwclen wells. Prior 10 measurement,tho probe tip i;lowered irito the Well unt;!;t tet!che:;bolterm US09 the previously established top-OI.~ast,nrg (''QC) point, thr_ ^robe cord (cr halyarrf; is marked and an measuring tape (graduated in hundredths of a ioot) �s Used to dc'.Mer"res the distance beracen t." probe end and tnc marking on the cord. This mCasurerrt nt i5 then recorded on the liquid-level data sheet as the: depth to s•rtIM (Dwq, ."hien using the Interface probe~ to treasure tigv�d levels, the probe is 1;rst Ei',E+C.rrC7�Iy grounded to either the metal stove Pipe or another metal ob;ect nearby. When no r;rcund is available, reproduc.ble measurements can be obtained by clipping the ground lead to the handle of tha interface probe case. After grounding the probe, the top of ere WO casing is fitted with a light filter to insure that sunlight does not interfere w,th the operas=G+1 of the probe's optical mechanisms. The probe tip is then lowered into era rrc ll ar•d KM submerged in tho groundwater. An oscillating (beeping) tone indicates that the prc"e is in wat;r. T'ie probe is slowly raised until either the oscillating tone ceases or becomes a s1eady tone. In either case, this is the depth-tp•waler idiCator and the DM measurement is made accordingly. —she steady tone indicates floating hydrocarbons. In this case, the probe is ,low;y raised until the steady tone ceases. This is the depth-10• product (DTP) indicator and the DTP measurement is made accord;ngiy. The process of lowering and raising ine probe must be rppeated several times to ensure accura'a measurements. The DTVI and DTP measurements are recorded on the I:quici level data sheet. When floating product is indicated by the probe's response, a r)"roduG bailer is lowered partially through the prod uc",.water interface to confirm the pro.:uct on the water surface, and as further indication of product thickness, particularly in cases vrhere the product layer is quite thin. This measurement is recorded ors the data sheet as product thickness (PT). In order to avoid cross contamination of wells during the liquid-level measurement process, wells are measured in the order of"clean" to 'dirty' (where such information is available). In addition, all measurement equipment is cleaned with TSP sctuticn and :hcroughiy rinsed with deicnized water before use.between rngasurements in resile;:ive y0ells and at tt10 completion of the day's vse-