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APEX ENVIROTECH, INC„ STANDARD OPERATING PROCEDURES Quarterly Monitoring Reports SOP - A. When practical,the groundwater sample should be collected t SAMPLE IDENTIFICATION AND CHAIN- when the water level in the well recovers to at least 80 percent OF-CUSTODY PROCEDURES of its static level. N Sample identification and chain-0f custody procedures ensure The sampling equipment consists of either a"T'erlon"bailer, PVC bailer,or stainless steel bladder pump with a'Terion" sample integrity as well as document sample possession from bladder, If the sampling system is dedicated to the well,then the time of collection to uitimate disposal. Each sample the bailer Is usually"Tenon,"but the bladder pump Is PVC with container submitted for analysis is labeled to identify 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 field observations also recorded on the field excavation or boring log. SOP - 12 MEASURING LIQUID LEVELS USING Chain-of-custody forms are used to retard possession of the WATER LEVEL METER OR INTERFACE sample from time of collection to arrival at the laboratory. PROSE During shipment,the persaA with custody of the samples will relinquish them to the next person.by signing the chain-af- Field equipment used for liquid-level gauging typically in m custody form(s)and noting the date and time. The sample- the measuring instrument(water-level meter or interface probe) control officer at the laboratory will verify sample Integrity, and product bailer(s). The field kit also includes cleaning correct preservation,confirm collection in the proper supplies(buckets,solution,spray betties,and deian¢ed water) cantainer(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 measurement,the instrument tip is lowered into the well unique laboratory log numbers for identification throughout until it touches bottom. Using the previously established tap-of- analysis and reporting, The log numbers will be recorded on_ casing or tap-of-box(.e.,wellhead vault)point,the probe card the chain--df-custody farms and in the legally-requ€red log book (or halyard)is marked and a measuring tape(graduated in maintained in the laboratory. The sample description,date hundredths of a feat)is used to determine the distance received,client's name,and any other relevant€nformation will between the probe end and the marking an the card. This also be recorded, measurement is then recorded on the liquid-level data sheet as the"Measured Total Depth'of the well, SOF' - S When necessary in using the Interface probe to measure liquid LABORATORY ANALYTICAL QUALITY levels,the probe is first electricallygrounded to either the metal ASSURANCE AND CONTROL stave pipe or another metal abject 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 methed-specifc frequencies to monitor The probe tip is then lowered into the well and submerged in precision and bias. Additional components of the laboratory the groundwater. An oscillating(beeping)tone indicates the Quality Assurance/Quality 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 I Participation in state and federal laboratory case,this is the depth-to-water(dTW)indication and the DTW accreditation/certification programs; measurement is made accordingly. The steady tone indicates Z Participation in both U.S.EPA Performance floating liquid Hydrocarbons(FLH). in this case,the probe is Evaluation studies(IIVS and WP studies)and Inter- slowly raised until the steady tone ceases. This is the depth-to- laboratory performance evaluationi programs; product(DTP)Indication and the DTP measurement Is made accordingly. 3. Standard operating procedures describing routine and periodic instrument maintenance; The process of lowering and raising the probe must be [ repeated several times to ensure accurate measurements. The 4. 'Out-of-Control"ICorrective Action documentation DTW and DTR measurements are recorded an the liquid-level data sheet. When FLH are indicated by the probes response, procedures;and, a product bailer Is lowered partially through the FLH-water liInterface to confirm the FLH an the water surface and as, 5. Matti-level review of raw data and client reports. further indication of the FLH thickness,particularly in cases SOP - 7 where the FLH layer is quite thin. This measurement Is' GROUNDWATER PURGING ANIS recorded on the data sheet as"FLH thickness. SAMPLING ' in order to avoid cross•contamination of wells during the liquid- Prior to water sampling,each well is purged by evacuating 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 wll continue until either the discharge addition,all measurement equipment Is cleaned with slLrUcn and thoroughly rinsed with derenh2ed water before use,between ter wetted-casing volumes of groundwater have been water temperature,conductivity,or stabilize,a maximum of measurements in respective wells,and at the completion of the recovered,or the well is bailed dry. days use. r