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The sampling equipment consists of a"Tedler bag(available The probe tip is then lowered Into the well and submerged in in 1 3,5 and 10 Inter sizes) a diaphragm pump and 1/4-mch- the groundwater An oscillating(beeping)tone indicates the diameter polyethylene tubing(apprommsitely 1 foot long) probe is in water The probe is slowly raised until either the oscillating tone mases or becomes a steadytone in either The sampling ports are brass connections fitted with a silicone case,this is the depth-to-water(DTW)indication and the DTW septa and threaded into a tapped hole in the system piping measurement is made accordingly The steady tone indicates The sampling procedure requires one end of the tubing be floating liquid hydrocarbons(FLH) In this case the probe m slipped over the sampling port and the other end over the slowly raised until the steady tone ceases This Is the depth-to- diaphragm pump to acquire an air-tight connection The product(DTP)indication and the DTP measurement is made sampling pump is purged for 1 minute with the e)tmcted vapor accordingly to be sampled Following purging the discharge of the pump is then diverted through a two-way valve into the"Tedlar"bag The process of lowering and raising the probe must be which should be filled to 314 of volume capacity Caution repeated several times to ensure accurate measurements The should betaken not to overfill the sampling bag The sample is DTW and DTP measurements are recorded on the Irquid4evel placed in a non-refrigerated dry cooler with sufficient packing to data sheet When FLH are indicated by the probe's response, eliminated damage during transport Cooling samples will a product bailer is lowered partmilythrough the FLH-water cause condensation of moisture within the sample thereby interface to confirm the FLH on the water surface and as distorting laboratory analysis further indication of the FLH thickoiess particularly in cases where the FLH layer is quite thin This measurement is For quality control purposes a duplicate vapor sample should recorded on the data sheet as"FLH thickness" be collected from each sampling port This sample is then put on hold at the laboratory pending initial analysis To ensure In order to avoid cross-contamination of wells during the liquid- quality control and minimize the potential for cross- level measurement process wells are measured in the order of contamination prior to and during sampling the diaphragm "clean"to"dirty'(where such information is available) in pump is thoroughly purged for approiamately 5 minutes with addition all measurement equipment is cleaned with solution nitrogen or clean air(i a compressed clean air) A"blanW and thoroughly rinsed with deconized water before use between sample of the discharged air is captured in a"Tedlar• bag at measurements in respective wells and at the completion of the the end of the purging procedure and may be analyzed to days use ensure the purging was effective To minimize the potential for cross-contemination between air samples the polyethyiene tubing if not sample dedicated is thoroughly cleaned and rinsed Vapor samples are subject to very limited holding times typically 48 hours Thus care must taken to avoid delays in • submittal of vapor samples to the laboratory In the evert the vapor samples cannot be submitted to the analytical laboratory on the same day they are collected they are to be temporarily stored in the dry non-refrigerated packed cooler until the very first opportunity for submittal veli within the required holding time taking into account the time needed for shipment to and receipt by the laboratory SOP-11 2 MEASURING LIQUID LEVELS USiNG WATER LEVEL METER OR INTERFACE PROSE Field equipment used for liquid-level gauging typically includes the measuring instrument(water-level meter or interface probe) and product bailer(s) The field iat also includes cleaning supplies(buckets solution spray bottles and deionized water) to be used in cleaning the equipment between wells Prior to measurement the instrument tip is lowered into the well until a touches bottom Using the previously established top-of- casing or top-of-box(i a wellhead vault)point the probe cord (or halyard)is marked and a measuring tape(graduated in hundredths of a foot)is used to determine the distance between the probe end and the marking on the cord This measurement is then recorded on the irquid-level data sheet as the"Measured Total Depth"of the well When necessary in using the interface probe to measure liquid levels the probe is first electrically grounded to either the metal stove pipe or another metal object nearby When no ground is available reproducible measurements can be obtained by clipping the ground lead to the handle of the interface probe case Page 2-SDP Operation&Maintenance