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APEX ENVIROTECH, INC. STANDARD OPERATING PROCEDURES . Quarterly Monitoring Reports fSOP - .4 When practical,the groundwater sample should be collected SAMPLE IDENTIFICATION AND CHAIN- when the water level in the well recovers to at least so percent OF-CUSTODY PROCEDUR»; of its static level. Sample identification and chain-of-custody procedures ensure The sampling equipment consists of either a"Teflon"bailer, sample integrity as well as document sample possession from PVC bailer,or stainless steel bladder pump with a"Teflon" bladder. If the sampling system is dedicated to the well,then the time of collection to ultimate disposal. Each sample the bailer is usually"Teflon,"but the bladder pump Is PVC with container submitted for anatysis 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-milliliter glass,volatile organic unique to the sample,any in-field measurements made, analysis(VQA)vials,with'Teflon"septa,are used as sample sampling methodology,name(s)of an-site personnel,and any containers, other pertinent field observations also recorded an the field excavation ar baring log. SOP _ 12 MEASURING LIgUID LEVELS USING Chain-cf-custody forms are wised to record possession of the WATER LEVEL METEF1 OR INTERFACE- sample NTERFACEsample from time of collection to arrival at the laboratory, PR o SEE During shipment,the person with custody.af the samples will relinquish them to the next person by signing the chain-cf- Field equipment used for Liquid-level gauging typically includes E. custody form(s)and noting the date and time. The sample- the measuring instrument(water-level meter or interface probe) control afrcer at the laboratary will verify sample Integrity, and product bailer(s). The field kit also includes cleaning correct preservatian,confirm collection in the proper supplies(buckets,so[utien,spray bottles,and deianiied water) centainer(s),and ensure adequate volume far analysis. to be used in cleaning the equipment between wells. If these-conditions are met,the samples wit!be assigned Prior to measurement, the instrument tip is lowered into the well unique laboratory log numbers for identification throughout until it touches bottom. Using the previously established tap-af- analysis and reporting. The tog numbers will be recorded on casing or top-af-box(.e.,wellhead vault)point,the probe cord the chain-of-custody forms and in the legally-required log book (or halyard)is marked and a measuring tape(graduated in maintained in the laboratory. The sample description,date hundredths of a fact)is used to determine the distance received,client's name,and any other relevant information will behveen the probe and and the marking an the cord, This also be recorded. measurement is then recorded an the liquid-level data sheet as the"Measured Total Depth"of the well. SOP 5 When necessary in using the interface probe to measure liquid 80 LA RATORY ANALYTICALLITY UA g levels, probe rote is first electricaltygrounded to either the metal ASSURANCE AND CONTROL slave i eoranothermetalobj3ectnearh . Whenno ground is pipe Y available,reproducible measurements can be obtained by In addition to routine instrument calibration,replicates,spikes, clipping the ground lead to the handle of the interface Probe blanks,spiked blanks,and certified reference materials are case. routinely analyzed at method-specific frequencies to mard#ar 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 AssurancelQuality Cancra!program include: probe is in water. The probe is slowly raised until either the oscillating tone ceases or becomes a steady tone. In either accreditatiarYcertification programs; I Participation state and federal laboratory case,this is the depth-ta-water(❑TW)indication and the D'iW ' measurement is made accordingly. The steady tone indicates 2 Participation in both U,S.EPA Performance floating liquid hydrocarbons(FLH)- In this case,the probe is Evaluation studies(WS and WP studies)and inter- slawty raised until the.steady tone ceases, This Is the depth-to- laboratory performance evaluation programs- product(DTP)Indication and the❑TP measurement is made accordingly. 3. Standard operating procedures descnbing routine and periodic instrument maintenance; The process of lowering and raising the probe must be repeated several times to ensure accurate measurements. The 4. "Out-of-Contrai"lCorrectr're Action documentation OTW and DTP measurements are recorded on the Liquid-level procedures;and, data sheet. When FLH are indicated by the probe's response, a product bailer Is lowered partialty through the FLH-water 5. Multi-level review of raw data and client reports, interface to confirm the FLH an the water surface and as, further indication of the FLH thickness,particularly in cases Sap _ -7 where the FLH layer is quite thin. This measurement]s I GROUNDWATER PURGING AND recorded on the data sheet as 71,1-1 thickness." SAMPLING In order to avoid cross-contamination at wells during the liquid. Prior to water sampling,each well is purged by evacuating a level measurement process,wells are measured In the order of minimum of three wetted well-casing volumes of groundwater, "clean"to'dirty'(where such information is available). In I When required,purging will continue until either the discharge addibcn,all measurement equipment Is cleaned with solution water temperature,conductivity,or pH stabilize,a maximum of and thoroughly rinsed with deianized water before use,between ten wetted-casing volumes of groundwater have been measurements in respective wells,and at the completion of the i recovered,or the well is bailed dry, day's use.