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APEX EIVViROTECH, INC. STANDARD OPERATING PROCEDURES Quarterly Monitoring Reports SOP - 4 When practical,the groundwater sample should be collected SAMPLE IDENTIFICATION AND CHAIN- when the water level in the well recovers to at least 60 percent OF-CUSTODY PROCEDURES of its static level The sampling equipment consists of either a"Teflon"bailer, Sample identification and chain-0f-custody procedures ensure PVC bailer,or stainless steel bladder pump with a"Teflon' a sample integrity as well as document sample possession from bladder if the sampling system is dedicated to the well,then the bme of collection to ultimate disposal Each sample the bailer Is usually"Teflon,"but the bladder pump is PVC with container submitted for analysis is labeled to identify the job a polypropylene bladder In general and depending on the number,date,time of sample collection,a sample number intended laboratory analysis,40-millilder glass,volatile organic unique to the sample,any in-field measurements made, analysis(VOA)vials,with'Teflon"septa,are used as sample sampling methodology,name(s)of on-site personnel,and any containers other pertinent field observations also recorded an the Field excavation or boring log SOP - 12 MEASURING LIgU1D LEVELS USING Chain-of-custody forms are used to record possession of the WATER LEVEL METER OR INTERFACE sample from time of collection to arrival at the laboratory PROBE During shipment,the person with custody of the samples wilt Field equipment used for liquid-level gauging typically includes relinquish them to the next person by signing the chain-of- the measuring instrument(water level meter or interface probe) custody form(s)and noting the date and time The sample control officer at the laboratory will verify sample Integrity, and product bailer(s) The field kit also includes cleaning correct preservation,confirm collection In the proper supplies(buckets,solution,spray battles,and deianized water) container(s),and ensure adequate volume for analysis to be used in cleaning the equipment between wells If these conditions are met,the samples will be assigned Prior to measurement,the instrument tip is lowered into the well unique laboratory log numbers for identification throughout until d touches bottom Using the previously established top-of- analysis and reporting The log numbers will be recorded on casing or top-of-box(e,wellhead vault)point,the probe cord (or halyard)Is marked and a measuring tape(graduated In the maintained the la forms and a the legally-required log book hundredths of a foot)is used to determine the distance maintained in the laboratory The sample description.date between the probe end and the marking on the cord This received, lient's name and any other relevant information will measurement is then recorded on the liquid-level data sheet as also be reccorded the"Measured Total Depth"of the well SOP - S When necessary in using the interface probe to measure liquid LABORATORY ANALYTICAL QUALITY levels,the probe is first electncalty grounded to either the metal ASSURANCE AND CONTROL 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 In addition to routine instrument calibration,replicates,spikes, case blanks,spiked blanks,and certified reference materials are routinely analyzed at method-specific frequencies to monitor The probe tip is then lowered into the well and submerged In precision and bias Additional components of the laboratory the groundwater An oscillating(beeping)tone indicates the Quality Assurance/Quality Control program include probe Is In water The probe is slowly raised until either the I Participation in state and federal laboratory oscillating tone ceases or becomes a steady tone In either accreditation/certification programs, case,this is the depth-to-water(DTW)Indication and the IDTW measurement is made accordingly The steady tone indicates U S EPA Performance floating liquid hydrocarbons(FLH) In this case,the probe Is 2 Participation in both Evaluation studies US and WP studies)and inter- slowly raised until the steady tone ceases This Is the depth-to- product(DTP)Indication and the DTP measurement Is made laboratory performance evaluation programs, accordingly 3 Standard operating procedures describing routine The process of lowering and raising the probe must be and periodic Instrument maintenance, repeated several times to ensure accurate measurements The "Out-of-Control"1Corrective Action documentation DTW and DTP measurements are recorded on the riqufd-level q data sheet When FLH are Indicated by the probe's response, procedures,and, a product bailer is lowered partially through the FLH-water 5 Muhl-level review of raw data and client reports Interface to confirm the FLH on the water surface and as further Indication of the FLH thickness,particularly In cases where the FLH layer Is quite thin This measurement Is SOP - 7 recorded on the data sheet as"FLH thickness" GROUNDWATER PURGING AND SAMPLING In order to avoid cross-contamination of wells during the(squid- Prior to water sampling,each well is purged by evacuating a level measurement process,wells are measured in the order of "clean"to"dirty'(where such information Is available) In minimum of three wetted well-casing volumes of groundwater addition,all measurement equipment is cleaned with solution When required,purging will continue until either the discharge and thoroughly rinsed with deianized water before use,between water temperature,conductivity,or pH stabilize,a maximum of measurements in respective wells,and at the completion of the ten wetted-casing volumes of groundwater have been days use recovered,or the well is bailed dry