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r APEX ENVIROTECH, INC. STANDARD OPERATING PROCEDURES Quarterly Monitoring Reports recovered;or the well is baited dry, When practical,the groundwater sample should be collocted when the water level in SOP - 4 the well recovers to at least 80 percent of its static levet. SAMPLE IDKNYII■IOATION AND,OliAIN- OF-OU STODY PROOi3DU RK23 The sampling equipment consists of either a`Teflon'bailer,PVC bailer,or stainless steel bladder pump vrith a'Teflon'bladder. if sample Integrity as well as docummenteats sample possession from the Sample identification and chain procedures ensure 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,votatite organic analysis any In-field measurements made,sampling methodology,names) (VOA)vials,with*Teflon"septa,are used as sample containers. or on-she personnel,and any other pertinent field observations also recorded on the field excavation or boring log. SOP - i R MKA23URIN43 LIQUID Li'NHLS USING Chain-of-custody forms are used to record possession of WATAR LEWRL MKTKR OR iNTIERIrAOE thesample from time of collection to arrival at the laboratory. PROIII� 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 li uid level gauging typically includes the form(s)and noting the data and time. The sample- ontrol officer measuring instrument(water-level metinterface and at the laboratory will verify sample integrity,correct preservation, meter or probe) confirm collodion in the proper containers product bailer(s). The field kit also includes cleaning supplies p p {),and ensure aduate (buckets,solution,spray bottles,and deiontzed water)to be used volume for analysis. In cleaning the equipment between wells. k If these conditions are mot,the samples will 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 chain-of- until it touches bottom. Using the previously established tap-of- { custody forms and in the legally-required log book maintained In casing or top-of-box(.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 wilt also be recorded. of a foot)is used to determine the distance between the probe end and the marking on the cord. This measurement is then recorded SOP - & on the liquid-level data shoot as the'Measured Total Depth'of the LABORATORY ANALYTIOAL QUALITY well. ASSURANOSE 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 electricalty 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 Assurance/Quality Control program include: the ground lead to the handle of the Interface probe case. 1. Participation In state and federal laboratory The probe tip Is then lowered Into the well 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 case,this Is the studies(WS and WP studios)and Inter-laboratory depth-to-water D performance evaluation programs; p ( �Indication and the DTW measurement is 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'lCorrective Action documentation procedi:res;and. The process of lowering and raising the probe must be repeated several times to ensure accurate measurements. The DTW and 5. Mufti-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 GROUNDWATER 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 crass-contamination of wells during the Trquid- 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, L water ,tem eratureconductivity, all measurement equipment Is cleaned wfth solution and p vizy,or pH stabilize,a maximum of ton wetted-casing volumes of groundwater have been thoroughly rinsed with doionized water before use,between measurements in respective wells,and at the completion of the days use.