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APEX E1YV7R0TECH, INC. STANCIARD OPERATING PROCEOURES Quarterly Monitoring Reports SOP - .4 When practical,the groundwater sample should be collected SAMPLE IDENTIFICATION AND C HAI N- when the water Ievel in the well recovers to at least FA percent OF-CUSTODY PROCEDURES e(Rs static levet. docume The sampling equipment consists of either a'Teflon"bailer, Sample identification and . ustody procedures ensure PVC bailer,or staisiiess steel bladder pump with a'Teflon' sample integrity as well as ocument sample possession from bladder. If the sampling system is dedicated to the well,then the time of coffecticn to ultimate disposal. Each sample the bailerls usually-Teflon,'but the bladder pump is PVC with. container submitted for analysis is labeled to Identity the job a polypropylene bladder. In general and depending an the number,date,time of sample collection,a sample number intended laboratory analysis,40-milliliter glass,volatile organic unique to the sample,any in-field measurements made, analysis(VOA)vials,with'Teflon'septa,are used as sample sampling methodology,name(s)of on-site personnel,and any containers, other pertinent held observations also retarded on the field excavation or baring lag. SOP " 12 MEASURING LIgUID LEVELS USING Chain-af-custody farms are used to record passessian of the WATER LEVEL ME: EFS O1q 1NT•EFgFAcE sample(ram 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-0f- Field equipment used for liquid4evel 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 labaratorywiil verify sample Integrity, and product bailer(s).-The field kit also includes cleaning correct preservation,confirm collection in the proper supplies(buckets,salutian,spray battles,and deianized water)' . container(s),and ensure adequate volume for analysis. to be used in cleaning the equipment between wells. If these conditions are met,the samples will be assigned Prior to measuremerit,the instrument tip is lowered into the well unique laboratory log numbers far identification throughout until a touches hattam. Using the previously established top-of= analysis and reporting. The log numbers will be recorded an casing or top-of-box(i.e.,wellhead vault)point,the probe card the chain-a(custedy forms and in the legally-required log back (or halyard)is marked and a measuring tape(graduated in . maintained in the labaratory. The sample description,date hundredths of a foot)is used to determine the distance . received,client's name,and any other relevant information will behveen the probe end and the marking on the card. This also he recorded.. measurement is then recorded on the liquid-level data sheet as J the'hleasured Total Cepth'of the well. SOP - S When necessary in using the interface probe to measure liquid LASORATORY ANALYTICAL QUALITY levels,the probe is first electrically grounded to either the metal S AS U RAN C E AND CONTROL stove 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 The probe tip is then lowered into the well and submerged In l precision and bias. Additionaf ccmpanents'a€the laboratory the groundwater. An oscillating(beeping)tone indicates the 4uatifiy AssurancelQuality Control program include; probe is in water. The probe is slowly raised until either the oscillating tone ceases or becomes a steady tone. In either t 1, Participation in state and federal laboratory case,this is the depth-to-water(p M!)indication and the OTW accreditationlcertification programs; measurement is made accordingly. The steady tone indicates 2 Participation in both U.S.EPA Performance 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(7TP)Indication and the DTP measurement Is made accordingly, 3.. Standard operating procedures describing roudne and periodic instrument maintenance; The process of lowering and raising the probe must be repeated several times to ensure accurate measurements. The 4. 'Out-cf-Control-lCarrective Action documentadcri DTW and DTP measurements are recorded an the liquid-.level procedures;and, data sheet. When FLH are indicated by the probe's response, a praduct bailer Is layered partially through the FLH-water 5, Mutti-level review at raw data and client reports. Interface to confirm the FLH an the water surface and as, €urther indication of the FLH thickness,particularly in cases SOP - 7 where the Fi.H layer is quite thin. This measurement is GROU[NOWATER PURGING AND recorded on the data sheet as-FLH thickness.' SAMPLING In order to avoid cross-contamination of wells durtng the liquid- Prior to water sampling,each well is purged by a racuating a level measurement process,wells are measured In the order of _ minimum of three wetted well-casing volumes of groundwater, 'clean"to'dirty (where such information is available}, In When required,purging will continue until either the cftscharge addition,all measurement equipment is cleaned with solution water temperature,conductivitly,or pH stabilize,a maximum of and thoroughly rinsed with deianized avatar before use,between ten wetted-casing volumes of grounu rater have been measurements in respective wells,and at the completion of the recovered,or the well is bailed dry. days use.