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APEX ENVIROTECH, INC. '- STANDARD OPERATING PROCEDURES Quarterly Monitoring Reports recovered,or the well is bailed,dry. When practical,the groundwater sample should be collected when the water level in SOP 4 SAMPLlI lQtN711F1OATION AND•OIHAIN- the well recovers to at least 80 percent of its static level. OF-OUSTODY PROOBDURAS The sampling equipment consists of either a"Teflon'bailer,PVC Sample identification and chain-of-custody procedures ensure bailer,or stainless steel bladder pump with a`Teflon'bladder. If sample Integrity as well as document sample possession from the the sampling system is dedicated to the well,then the bailer is time of collection to ultimate disposal. Each sample container usually"Teflon;but the bladder pump is PVC with a submitted for analysis Is labeled to Identify the job number,date, polypropylene bladder. In general and depending on the intended time of sample collection,a sample number unique to the sample, laboratory analysis,40-milliliter glass,volatile organic analysis any In-field measurements made,sampling methodology,name(s) (VOA)vials,with"Teflon'septa,are used as sample containers. of on-site personnel,and any other pertinent field observations also recorded on the field excavation or boring log. SOP - In MAEASUPING LiQUID LKVRLS USING Chair-of-custody forms are used to record possession of WATi1;R LILNEL IV KTKR OR-IN7ERFAOB thasample from time of collection to arrival at the laboratory. PROM During shipment,the person with custody of the samples will relinquish them to the next person by signing the chain-of-custody Field equipment used for liquid-level gauging form(s)and noting the date and time. The sample-controt officer p q 9 9 g typically includes the at the laboratory will verify sample Integrity,correct preservation, measuring instrument(water-level meter or Interface probe)and confirm collection in the proper container(s),and ensure adequate product bailer(s). The field kit also includes cleaning supplies volume for analysis. (buckets,solution,spray bottles,and deionized water)to be used In cleaning the equipment between wells. If these conditions are met,the samples will be assigned unique laboratory log numbers for identification throughout analysts and Prior to measurement,the instrument tip is lowered Into the well reporting. The log numbers will be recorded on the chain-0f- until it touches bottom. Using the previously established top-of- custody forms and In the legally-required log book maintained in casing or top-of-box(i.e.,wellhead vault)point•the probe cord(or the laboratory. The sample description,date received,client's halyard)is marked and a measuring tape(graduated In hundredths name,and any other relevant information will also be recorded. of a foot)is used to determine the distance between the probe and _ and the marking on the cord. This measurement is then recorded SOP 6 on the liquid-level data sheet as the'Measured Total Depth'of the �j�'✓f LABORATORY ANALYTICAL QUALITY well. ASSURANCK AND CONTROL In addition to routine instrument calibration,replicates,spikes, When necessary in using the Interface probe to measure liquid blanks,spiked blanks,and certified reference materials are levels,the probe is first electrically grounded to either the metal routinely analyzed at method-specific frequencies to monitor stove pipe or another metal object nearby. When no ground is precision and bias. Additional components of the laboratory available,reproducible measurements can be obtained by clipping Quality AssurancelQuality Control program Include: the ground lead to the handle of the Interface probe case. I. Participation in state and federal laboratory The probe tip is then lowered Into the well and submerged in the accreditationlcertification programs; groundwater. An oscillating(beeping)tone indicates the probe is in water. The probe is slowly raised until either the oscillating tone 2. Participation in both U.S.EPA Performance Evaluation ceases or becomes a steady tone. In either case,this is the studies(WS and WP studies)and inter-laboratory depth-to-water(DTW)indication and the DTW measurement is performance evaluation programs; made accordingly. The steady tone indicates floating liquid 3. Standard operating procedures describing routine and hydrocarbons(FLH). In this case,the probe Is slowly raised until periodic Instrument maintenance; the steady tone ceases. This Is the depth-to-product(DTP) indication and the DTP measurement Is made accordingly. 4. "Out-of-Control'/Corrective Action documentation procedures;and, The process of lowering and raising the probe must be repeated several times to ensure accurate measurements. The DTW and 5. Multi-level review of raw data and client reports. DTP measurements are recorded on the liquid-level data sheet. When FLH are Indicated by the probe's response,a product bailer SOP - 7 is lowered partially through the FLH-water interface to confirm the QROUNDWA78R PURGING AND FLH on the water surface and as further indication of the FLH SAMPLING thickness,particularly In cases where the FLH layer is quite thin. This measurement is recorded on the data sheet as*FLH Prior to water sampling,each well is purged by evacuating a thickness.' minimum of three wetted well-casing volumes of groundwater. When required,purging will continue until either the In order to avoid cross-contamination of wells during the liquid- , dischargethree wetted well-casing volumes of groundwater. level measurement process,wells are measured in the order of When required,purging will continue until either the discharge 'clean'to'dirty'(where such information is available). In addition, water temperature•conductivity,or pH stabilize,a maximum of all measurement equipment Is cleaned with solution and ten wetted-casing volumes of groundwater have boon thoroughly rinsed with deionized water before use,between measurements in respective wells,and at the completion of the days use.