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APEX ENVIROTECH, INC. _ STANDARD OPERATING PROCEDURES i ( i Quarterly Monitoring Reports 4� f SOP - 4 When practical,the groundwater sample should be collected SAMPLE IDENTIFICATION AND CHMN_ when the water level in the well recovers to at least 80 percent .OF-CUSTODY PROCEDURES of its static level. Sample identification and chain-0r-custody procedures ensure The sampling equipment consists of either a'Teflon"bailer, sample integrity as well as document sample possession from FVC bailer,or stainless steel bladder pump with a"Teflon` the time of collection to ultimate disposal. Each sample bladder. If the sampling system is dedicated to the well,then . container submitted for analysis is labeled to Identify the job the bailer Is usually"Teflon,"but the bladder pump is PVC with number,date,time of sample collection,a sample number a polypropylene bladder. In general and depending on the unique to the sample,any in-field measurements made, intended laboratory analysis,40-milliliter glass,volatile organic sampling methodology,name(s)of on-site personnel,and any analysis(VOA)vials,with"Teflon'septa,are used as sample containers. other pertinent field observations also recorded on the field excavation or boring lag. SOP - in MEASURING LIQUID LEVELS WING Chain-at-custody forms are used to record possession of the WATER LEVEL METIER OR INTERFACE sample from time of collection to arrival at the laboratory. PROBE During shipment,the person with custody of the samples will relinquish them to the next person by signing the chain-or- Field equipment used for liquid-levet gauging typically Includes custody form(s)and noting the date and time. The sample- the measuring instrument(water-level meter or interface probe) 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 bottles,and deionized water) container(s),and ensure adequate volume for analysis, to be used in cleaning the equipment between wells. E 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 it touches bottom. Using the previously established top-of- analysis op-0(analysis and reporting. The log numbers will be recorded on casing or top-of-box(i.e.,wellhead vault)point,the probe cord the chain-afmcustody forms and in the legally-required lag 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,clienrs name,and any other relevant information will between the probe end and the marking on the cord. This f also be recorded. measurement Is then recorded an the liquid-level data sheet as the'Measured Total Depth"of the well SOP - S When necessary in using the interface probe to measure liquid LABORATORY ANALYTICAL qUALrTY levels,the probe is first electrically grounded to either the metal ASSURANCE AND CONTROL stave pipe or another metal object nearby- When no ground Is 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 monitor precision and bias. Additional components of the laboratory The probe tip is then lowered into the well and submerged In Quality Assurance/Quality Control program include. the groundwater. An oscillating(beeping)tone indicates the probe is in water. The probe Is slowly raised until either the oscillating tone ceases at becomes a steady tone. In either 1. participation instate and federal laboratory g dY accreditation/certification programs; case,this Is the depth-to-water(OTW)Indication and the DTW measurement is made accordingly. The steady tone lndicates Participation in both U.S.EPA Perfornmrnce floating liquid hydrocarbons(FLH). In this case,the probe Is Evaluation studies(WS and WP studies)and Inter- slowly raised until the steady tone ceases. This Is the depth-to- laboratory performance evaluation programs; product(DTP)Indication and the DTP measurement Is made . accordingly. 3. Standard operating procedures describing 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-af-Contrar/Corrective 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 towered partially through the FLH-water 5. Mufti-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 SOP - 7 where the FLH layer is quite thin. This measurement is GROUNDWATER PURGING AND recorded on the data sheet as"FLH thickness." SAMPLING In order to avoid crass-contamination of welts 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-dirV(where such information Is available). In When required,purging will continue until either the discharge addition,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 recovered,or the well is bailed dry, day's use. I