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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 the well recovers to at least 80 percent of its static level, SAMPLit~ 1K)KNTIFIOA1rION AND•OFiA1N- OlR-oU STODY PROO>4DIrRxis The sampling equipment consists of either a'Teflori bailer.PVC p dy procedures ensure bailer,or stainless steel bladder pump with a'Teflon'bladder. If Sample n egrity as and documents a the sampling system is dedicated to the well,then the bailer is sample Integrity es well as document sample possession from the time or collection to ultimate disposal. Each sample container usually`Teflon;but the bladder pump 4 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 - 7 3z MILASURINQ L1Q1UJD Lt♦1i►rMLS USING Chain-of-custody forms are used to record possession of WATMER LttdVAEL MIKTHR OR 1NTBF1PrAOIt thosample from time of collection to arrival at the laboratory. PR OIIH During shipment,the person with custody of the samples Wit relinquish them to the next person by signing the chaln-okustody Field equipment used for ti uid-level au in g typically includes the form(s)and noting the date and time. The sample-control officer measuring instrument(water-tevel meter or interfacerobe)and at the laboratory will verify sample integrity,correct preservation, product bailer(s). The field kit also includes cleaning su confirm collection in the proper container(s),and ensure adequate 9 pplies (buckets,solution,spray bottles,and deiontzed water to be used volume for analysis. In cleaningthe ) equipment between welts. If these conditions are met,the samples Wit be assigned unique laboratory log numbers for Identification throughout analysis and Prior to measurement,the Instrument tip is lowered Into the well reporting. The log numbers will be recorded on the chaln-of- until it touches bottom. Using the previously established top-of- custody op-0tcustody forms and in the Inalty-required log book maintain ad in casing or top-of-box(.e.,wellhead vault)point,the probe cord(or r ` the laboratory. The sample description,date received,client's halyard)Is marked and a measuring tare(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 end and the marking on the cord. This measurementdsthen recorded SOP - G on the liquid-level data shoot as the*measured Total Depth`of the LA13ORA'rORY ANALYTIOAL QUALITY welt. ASSURANOR AND OONTROL 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. 1. Participation to state and federal laboratory The probe tip Is then lowered into the wall and submerged In the accreditation/certification 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 lase,this Is the studies(WS and WP studies)and inter-laboratory depth-to-water(OTM Indication and the DTW measurement 4 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-orControl'iCorractive Action documentallon procedures;and. The process of lowering and raising the probe must be repeated several times to ensure accurate measurements. The DTW and S. Multi-levet 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 - q Is lowered partially through the FLH water Interface to confirm the GROUNDWATER PURGING AND FLH on the water surface and as further Indication afthe FLH SAMPLING thickness,particularly In cases where the'FLH layerls 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 wall-casing volumes of groundwater. When required,purging will continue until either the In order to avoid eress-contamination of wells during the Gquid- dischargethree wetted wall-casing volumes of groundwater. level measurement process,wells are measured in the order or When required,purging will continue until either the discharge 'clean'to'dirty'(where such information is available). Inaddition, water temperature,conductivi-[y,or pH stabilize,a maximum of all measurement equipment is cleaned with solution and ten wetted-casing volumes of groundwater have been thoroughly rinsed with dsionized water t)-afore use,between measurements in respective wells,and at the completion of the day's use.