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f i ' APEX ENVIROTECH. INC. remains in the cooler during transport,and is analyzed by the laboratory along with the groundwater samples. In addition,a field blank may be STANDARD OPERATING PROCEDURES prepared in the field when sampling equipment is not dedicated. The field blank is prepared after a pump or baler has been either steam cleaned or Quarterly Monitoring Reports properly washed.prior touse inthis next well.and isanalyzed along with the other samples. The field blank analysis demonstrates the OP-4 effectiveness of the in-field cieaning procedures to prevent aoss- contamintatlon. QAMPLE IDENTIFICATION AND CHAIN-017- To minimize the potential for cross-contamination between wells,all wed CUSTODY PROCEDURES development and water sampling equipment not dedicated to a well is either steam cleaned or properly washed between use. As a secondary Sample identification and chain-ot—custody procedures ensure sample precautionary measure,wails ate sampled In order of least to highest integrity as well as document sample possession from the lima of concentrations asestablished by available previous analytical data. collection to ultimate disposal. Each sample container submitted for In the event the watersa les cannot be submitted to the analytical analysis is labeled 10 identify the lob number.date,time of sample samples collection,a sample number unique to the sample,any in-11M laboratory on the same day they are collected(e.g..due 10 weekends or measurements made.sampling methodology,name(s)of on-site holidays),the samples are temporarily stored until the first opportunity for personnel,and any other pertinent field observations also recorded on the submittal either on water inti in a cooler,such as when in the field,or in fletd excavation or boring log. refrigerator at Apex's office. Chain-ot-custody loins are used to record possession of the sample from SOP-12 time of collection to amivai at the laboratory. touring shipment,the person with custody of the samples will relinquish them to the next personby MEASURING LIQUID LEVELS USING WATER signing the chain-of-custody form(s)and noting the date and time. The LEVEL METER OR INTERFACE PROBE sample-control officer at the laboratory will verily sample integrity, correct preservation,confirm colledion in the proper coniatner(s).and ensure adequate volume for analysis. Fleld equipment used foriiquid-level gauging typically includes the measunng instrument (water-avec meter or iriterface probe)and product It these conditions are met,the samples will be assigned unique laboratory bailar(s}. The field kit also includes cleaning supplies(buckets,solution. log numbers for identification throughout analysis and reporting. The log spray bottles,and deiontzed water)to be used in cisarvrig the equipment numbers will be recorded on the chainrof-custody loans and in the legally- between weds. required log book maintained in the laboratory. The sample description, date received,cfieenl's name,and any other relevant information will also Prior to measurement,the instrument tip is lowered Into the well untll d be recorded, touches bonom. Using the previously established top-of-casing or top-ol- box(i.e.,wellhead vault)point, the probe cord(or halyard) is marked and a measuring tape(graduated in hundredths of a toot) is used to determine SOP-5 the distance between the probe end and the marking on the cord. This LABORATORY ANALYTICAL QUALITY measurement is then recorded on the liquid-level data sheet as the ASSURANCE AND CONTROL 'Measured Total Depth*of the wait. When necessary in using the interface probe to measure liquid levels,the In addition to routine instrument calibration,replicates,spikes,blanks, probe is first electrically grounded to either the metal stove pipe or another spiked blanks,and certified reference materials are routinely analyzed at metal object nearby. When no ground Is available,reproducible method-specific frequencies to monitor precision and bias. Additional measurements can be obtained by clipping the ground lead to the handle components of the laboratory Quality Assurdnce/Quality,Control program of the interface probe case. include: The probe tip is then lowered Into the wed and submerged in the / Ni. Participation in state and federal laboratory grvundw�atier. An oscillating(beeping)tore indicates the probe is in water. \* , aaxeditatkinicartiricalion programs: The probe is slowly raised unit either the oscillating tone ceases or becomes a steady lone. In either case,this is the depth-to-water(DTW) 2. Participation in both U.S. EPA Performance Evaluation studies indication and the OTW measurement is made accordingly. The steady (WS and WP studies)and inter-laboratory performance tone indicates floating liquid hydrocarbons(FILH). In this case,the probe is evaluation programs; slowly raised until the steady tons ceases. 1-hl6 is the depth-to-product (DTP)Indication and the DTP measurement is made accordingly. 3. Standard operating procedures describing roullne and periodic Instrument maintenance: The process of lowering and raising the probe must be repeated several times to ensure accurate measurements. The DTW and DTP 4. out-of-controricorrective Action documentation procedures: measurements are recorded on the liquid-level data shoat. When Fiji are and. indicated by the probe's response,a product baiter is lowered partially through the FLH-water inMeAace to contlrm the FL4 on the water surface 5. Mull-level review of raw data and client reports, and as further Indication of the FLH thickness,particularly in cases where the FLH layer Is quite thin. This measurement is recorded on the data SOP-7 sheet as'FLH thickness.* GROUNDWATER PURGING AND SAMPLING In order to avoid cross-contamination of walls during the NgWd•level measurement process.wells are measured in the order of'clean' to'dirty" Prior to water sampling,each wet ls u evacuating (where such information is available). In addition.all measurement [tree wetted n9. purged Ing a minimum of equipment is cleaned with solubon and thoroughly rinsed with detontized weg volumes of groundwater. When requited,purging water before use,between measurements in respective wells,and at the will continue until either the discharge water temperature,conductivity,or completion of the days.use. pH stabilize.a maximum of ten wetted-casing volumes of groundwater have been recovered.or the wed Is trailed dry. When practkxal,the groundwater sample should be collected when the water levet in the well recovers to at least 80 percent of Its static level. The sampling equipment consists of either a'Teflon'bailer,PVC bailer,or stahiess steel bladder pump with a'Teflon'bladder. If the sampling system is dedicated to the wel,then the baikw is usually'Teflon,'but the bladder pump is PVC with a polypropdependg on the intendedryylera bladder. In general arid_ gan oric analysis(VOA)vials.with Tafl are used samanalysis,40-millifillw ple containers. The groundwater sample is decarded Into each VOA vial In such a manner that there is no meniscus all the top of the vial A cap is qukddy secured 10 the top of the vial The vial Is then inverted and gently tapped to see l air bubbles are present, h trona are present.the vial Is labeled and refrigerated for delivery,under sulk dceikwf-custody.to the analytical laboratory. Lebed Information should irgduds a unique sample identification number,job kdentlflcation number.date.time,type of analysis requested,and the sarrpier's name. For quality control purposes, a duplicate water sample is coleded from each wall. This sample may also be analyzed or put on hold at the { laboratory. When required,a trip blank,prepared at the laboratory, is i plated in the transport cooler. It is labeled 3imiierto the wed samples.