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SAMPLE IDENTIFICATION AND CHAIN-OF-CUSTODY PROCEDURES should include a unique sample identification number,job identification number. date,time.type of analysis requested,and the sampler's name. SOP-4 Sample identification and chain-of-custody procedures ensure sample integrity. For quality control purposes, a duplicate water sample is collected from each and document sample possession from the time of collection to its ultimate well- This sample is put on hold at the laboratory. When required.a trip blank disposal. Each sample container submitted for analysis is labeled to identify the is prepared at the laboratory and placed in the transport cooler- It is labeled job number, date, time of sample collection, a sample number unique to the similar to the well samples. remains in the cooler during transport, and is sample.any in-field measurements made.sampling methodology,name(s)of on- analyzed by the laboratory along with the groundwater samples. In addition.a site personnel and any other pertinent field observations also recorded on the field field blank may be prepared in the field when sampling equipment is not excavation or boring log. dedicated. The field blank is prepared after a pump or bailer has been either steam cleaned or properly washed,prior to use in the next well.and is analyzed Chain-of-custody forms are used to record possession of the sample from time of along with the other samples. The field blank analvsis demonstrates the collection to its arrival at the laboratory. [hiring shipment. the person with effectiveness of the in-field cleaning procedures to prevent cross-contamination, custody of the samples will relinquish them to the next person by signing the chain-of-custody form(s) and noting the date and time. The sample-control To minimize the potential for cross-contamination between wells. all well officer at the laboratory will verify sample integrity.correct preservation.confirm development and water sampling equipment not dedicated to a well is either collection in the proper container(s), and ensure adequate volume for analvsis, steam cleaned or properly washed between use. As a second precautionary measure. wells are sampled in order of least to highest concentrations as If these conditions are met,the samples will be assigned unique laboratory log established by available previous analytical data. numbers for identification throughout analysis and reporting. The log numbers will be recorded on the chain-of=custody forms and in the legally-required log In the event the water samples cannot be submitted to the analytical laboratory book maintained in the laboratory. The sample description.date received,client's on the same day they are collected (e.g., due to weekends or holidays), the name,and any other relevant information will also be recorded. samples are temporarily stored until the first opportunity for submittal either on ice in a cooler,such as when in the field.or in a refrigerator at Aegis'office. LABORATORY ANALYTICAL QUALITY ASSURANCE AND CONTROL MEASURING LIQUID LEVELS USING WATER LEVEL OR INTERFACE SOP-5 PROBE In addition to routine instrument calibration, replicates, spikes, blanks, spiked blanks.and certified reference materials are routinely analyzed at method-specific SOP-12 frequencies to monitor precision and bias. Additional components of the Field equipment used for liquid-level gauging typically includes the measuring laboratory Quality AssurancciQuality Control program include: probe(water-level or interface)and product bailer(s). The field kit also includes cleaning supplies(buckets.TSP,spray bottles.and deionized water)to be used I. Participation in state and federal laboratory accreditationi certification in cleaning the equipment between wells. programs: Prior to measurement, the probe lip is lowered into the well until it touches 2. Participation in both U.S. EPA Performance Evaluation studies(WS bottom. Using the previously established top-of-casing or top-of-box (i.e.. and WP studies) and inter-laboratory performance evaluation wellhead vault)point,the probe cord(or halyard)is marked and a measuring tape programs; (graduated in hundredths of a foot)is used to determine the distance between the probe end and the marking on the cord. This measurement is then recorded on 3. Standard operating procedures describing routine and periodic the liquid-level data sheet as the "Measured Total Depth"of the well. instrument maintenance_ When necessary in using the interface probe to measure liquid levels.the probe 4. "Out-of-Control"/Corrective Action documentation procedures: and. is first electrically grounded to either the metal stove pipe or another metal object nearby. When no ground is available, reproducible measurements can be 5. %fulti-level review of raw data and client reports, obtained by clipping the ground lead to the handle of the interface probe case. GROUNDWATER PURGING AND SAMPLING The probe tip is then lowered into the well and submerged in the groundwater. .An oscillating(beeping)tone indicates the probe is in water. The probe is slowly SOP-7 raised until either the oscillating tone ceases or becomes a steady tone. In either Prior to water sampling,each well is purged by evacuating a minimum of three case.this is the depth-to-water(DTW)indicator and the DTW measurement is wetted well-casing volumes of groundwater. When required. purging will made accordingly. The steady tone indicates floating hydrocarbons. In this case- continue until either the discharge water temperature. conductivity. or pH the probe is slowly raised until the steadv tone ceases. This is the depth-to- stabilize. a maximum of ten weil-bore volumes of groundwater have been product(DTP)indicator and the DTP measurement is made accordingly. recovered, or the well is bailed dry. When practical.the groundwater sample should be collected when the water level in the well recovers to at least 80 The process of lowering and raising the probe must be repeated several times to percent of its static level, ensure accurate measurements. The DTW and DTP measurements are recorded on the liquid-level data sheet. When floating product is indicated by the probe's The sampling equipment consists of either a "Teflon" bailer, PVC bailer, or response.a product bailer is lowered partially through the product-water interface stainless steel bladder pump with a"Teflon"bladder. If the sampling system is to confirm the product on the water surface,and as further indication of product dedicated to the well.then the bailer is usuaifv"Teflon." but the bladder pump thickness. particularly in cases where the product laver is quite thin. This is PVC with a polypropylene bladder. In general and depending on the intended measurement is recorded on the data sheet as "product thickness." iahoratory analvsis.40-milliliter glass,volatile organic analysis(VOA)vials.with "Teflon" septa. are used as sample containers. In order to avoid cross-contamination of wells during the liquid-level The groundwater sample is decanted into each VOA vial in such a manner that measurement process,wells are measured in the order of"clean"to"dim,"(where there is no meniscus at the top of the vial. A cap is quickly secured to the top such information is available). In addition.all measurement equipment is cleaned of the vial. The vial is then inverted and gently tapped to see if air bubbles are kith TSP or similar solution and thoroughly rinsed with deionized water before present. If none are present, the vial is labeled and refrigerated for deliver, use,between measurements in respective wells.and at the completion of the day's under strict chain-of-custody. to the analytical laboratory. Label information use. AEGIS ENVIORNMENTAL,INC. ULTRAMAR OM SOP-d,5.7,171OCTOSER 1.1993