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Z. 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 fleld When sampling equipment Is not dedicated. The field Quarterly Manitorin Reports blankisPreparedafterapumporbaderhasbeenethersteamcleanedor g pOrproper/washed,prior to use in the next well.and a analyzed along with the other samples. The field blank analysts demonstrates the $n1 0-4 effectiveness of the In-lieid cleaning procedures to prevent cross- ;PLE IDENTIFICATION AND CHAIN-OF- contamination. G"&3T O DY PROCEDURES To minimize the potential for cross-contamination between wells,aft wet development and water sampling equipment not dedicated to a well is either steam cleaned or property washed between use. As a secondary Sample Identification and chain-of-Custody procedures ensure sample precautionary measure.walls are sampled In order of least to highest Integrity as well as document sample possession from the tins of concentrations as established by available previous analytical data- collection to ultimafe dlsposaL Each sample container submitted for analysis is labeled 10 identify the lob number,date,time of sample in the event the water samples cannot be submitted to the analytical collection,a sample number unique to the sample, any In•fleid laboratory on the same day they ane collected(a.g..due to weekends or measuremettts made.sampling methodology.names)of on-sxa holktaYs)i,the samples are lemporany stored until the first Opportunity for personnel,and any other pertinent"Old ofxeanvatbns also recorded on the submittal either on water toe in a cooler,such as when in the Heid,of it Reid excavation or boring log refrigerator at Apex's oftim Chain-of-custody,tortes ars used to record poseaadon of the sample from SOP-j Z time of collection to arslval at the laboralory. During shiprnarf,the person Yam custody of the samples wd relinquish them to the nest person by MEASURING LIQUID C E Y E L S USING WATER signing the&MO-ol-cuslody tof fX*and noting the date and time. The LEVEL METER OR INTERFACE PROBE sample-contort otflicer at the laboratory wd verity sample integrity, carred preservation.confirm collection in the proper container(s).and ensure adequate volume for afmuy m& Field equipment used for liquid-levelau u 9 9 ng typkaty includes the measuring Instrument (willfw- velme(ef Or Interface probel and Product it these conditions are met, tate samples will be assigned unique laboratory barier(a). The field Idt alio incudes cleaning supplies rbuckars.sounion. log numbers for tdertlltcatfon throughout analvses and reponlrq. The bq spray bathes.and deioruzed water)to be used in cjsannq the equipment numbers wd be recorded on the chain-of-anfody forms and in the legally- between weft required log book maintained in the laboratory. The sample descfltion. date received.cient5 name.and any other relevant Information will also Prior to measurement.the instrument 11P is lowered Into the ureic until I be recorded. !ouches bottom. Using the previously esiablbtned tOp o-casing or tov-of- box(i.e..wellhead vautil part, the Prone cora(or hayard) is marked and a SOP-5 measuring tape (graduated in hundredths of a foal is used to determine Ills distance between the probe end and the mandnq an the cora. This LA130RATORY ANALYTICAL QUALITY measurement is than recorded on the liqurd•leveldata&meet as the ASSURANCE AND CONTROL 'Measured Total Depth`of thewefL When necessary In us"the interface probe to measure Ikttrd levels,the In addition to routine instrument callbadlion.repYeates.spikes,blanks. Probe Is tlrst electrically grounded to either the metal slave PCs or another spiked blanks.and cartMfed reference materials am routinecy anitfyzed at metal oblsct nearby. When no ground Is available.reoroauble methoC-svecflc irequarmlm to momor precision and blas. additional measurements can be obtained by clipping the ground teaq to the handle components of the laboratory Quality Assuran e4witily Control program of the Interlace probe case. Include: The probe tip b then Towered into the wed and submerged in the Paritdpation in state arta federal laboratory groundwatw• An owifti ng ibeitoM torte indkates the probe b In water. accredi ationVaeAUk�tbn programs: M probe a sfowry rafted until either the oarillating tone ceases or becomes a steady tore. In ether cess,this is the CeprrWwwar fOTW) 2. Participation In both U.S. EPA PeAormance Evaluation studles Inckabon and the DTW measurement is made adsmdlxjy. The steady (WS and WP studMs)and inter-laboratory perfomtarm tone ingkates floating Iktuud hydrocarbons(FLM). In aha we,the Prat*as evaluation programs; slowty rafted until the sloom torts ceaeea. This Is the down4o-prodttc2 (l7TP)Inak aWn and the OTP meawrsrrem if made aacafdngly. 3. Standard t mai t maintenance. desoribkng routine artd P*rtodlc The process of kaweNtq and Mill"the probe must be revealed several Instrument marmenartor times to ensure accurate measurements The DTW and DTP 4. 'Out-0f-controricorrectbe Action doeumemailon procedures: measurements an recorded on the tkpad-level data sheet. When FLH ars arid. Indicated by the probe's response.a product baler is lowered partially througn the FLMwrater Intertaim to confirm the FLM on the water surface 5. Muabtevei narrow of raw data and client reports. and as further Indication of the FLJ4 thlomesa.partiesdany in puss wnin the FI.lt layer Is quit*thin. This nmssfursmem ks recoraw on the data SOP-7 sheet as TFLH thfdinsss• GROUNDWATER PURGING AND SAMPLING In Draw to avow nof waft during tterdfliWevel measurement process.webs are measured in the order at•clean• to'dl'!y (where such information is available). In addltlom.ale measurement Pea to water sartprng,suM war Is Purged by evecuaabug a minimum of equipment is deared with solution and thoroughly misedt wedwormtzad thras waded weYrafing vokunes of groundwater. When raquirsd.Purglhg water before use,between measnnllents n refpoWnweft and at the ,Ad continue until edner the disddtargf water temperature.conawctivity,or oompiatbn of the days uss. pH stablue.a maximum of ten wetted-casing volumes at grountlwmer hate teen recovet'ed.or the well Is blued dry. When practical.the gpotirtdwetor sample Should be collected when the widw level in the wad recovars to at local 80 percent of Its Static 1fvsL The sampling equlpm i l oonsista at sithfr a Teflon'bOw.PVC bailer,or soutrtefa sleet bM erpump with a T*florY bleddfr. a the s impoig "mom Is dsdiddaA to the war,then On borer ft ulnar)-Teflon.-but the bladder pup is PVC with a pagpropyfelf blsrddfr. In general and dfperudIng on the intended anelyele.40-nrrrlar glass.voiatlM org f>!c analysis(VOA)vials.w 0 T sepia,ate used as sample ooflaknrs. The gmurndwator sm. I*is decanted Irt10 each VOA vW In such a manner that them a no mmentectu at the top of the vial. A cap Is quickly secured to the top of the vial. The vial Is than tw 04 and gently tapped to see f air bubbles are presMt. M normo are piesert.ON vial a labelled and rtdrtq&rW*d for delivery.under Stott ctsslr**$custody,to the artatyfkal �ry. Label Information should include a unique sample irattan mrmtber,lob Iomilleabon numtbl r,dais,tWm.type at requested.and the sartphrf name. For qualtty control purposes, a dcplkale water sample is collected from eacn wed. This sample may abo b*aralyaed or put an hold at the laboratory. When required.a trip biartk.prepared at the laboratory, is placed in the tnyepaf cooter. It is labeled setrurto the well tar pies,