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SAMPLE IDENTIFICATION AND CHAIN-OF-CUSTODY PROCEDURES similar to the well samples, remains in the cooler during transport, and is analyzed by the laboratory along with the groundwater samples In addition,a SOP-4 field blank may be prepared in the field when sampling equipment is not pie identification and chain-ofcustody procedures ensure sample ustegrty, dedicated The field blank is prepared after a pump or bailer has been either document sample possession from the tune of collection to As ultimate steam cleaned or property washed,prior to use in the next well,and is analyzed poral. Each sample container submitted for analysis is labeled to identify the along with the other samples The field blank analysis demonstrates the job number, date, time of sample collection, a sample number unique to the effectiveneas of the m-fieid cleaning procedures to prevent cross-comantmabOn- sample,any in-field measurements made,sampling methodology,name(s)of on- site personnel and any other pertment field observations also recorded on the field To minimize the potential for cmas-eontarnmation between wells, all well excavation or boring log, development and water sampling equipment not dedicated to a well is either steam cleaned or properly washed between use As a second precautionary Chain-of-custody forms are used to record possession of the sample from time of measure, wells ars sampled in order of least to highest concentrations as collection to its arrival at the laboratory During shipment, the person with established by available previous analytical data. custody of the samples will relinquish them to the neia person by signing the chain-of-custody form(s) and noting the date and tune The sample-control In the event the water samples cannot be submitted to the analytical laboratory officer at the laboratory will verify sample integrity,correct preservation,confirm on the same day they are collected (c g, due to weekends or holidays), the collection in the proper contamer(s),and ensure adequate volume for anaivsis samples are temporarily stored until the Cost opportunity for submittal either on ice in a cooler,such as when in the field,or in a refrigerator at Aegis'office If therm conditions are met,the samples will be assigned unique laboratory log numbers for identification throughout analysis and reporting. The log numbers ALEASURING LIQUID LEVELS USING WATER LEVEL OR INTERFACE Will be recorded on the chats-of-custody forms and in the legally-required lag PROBE book maintained in the laboratory The sample description,date received,client's name,and any other relevant information will also be recorded SOP-12 Field equipment used for liquid-level gauging typically includes the measuring LABORATORY ANALYTICAL QUALITY ASSURANCE AND CONTROL, probe(water-level or interface)and product bailers} The field kit also includes ,.leanmg supplies(buckets,TSP spray bottles,and detonized water)to be used SOP-5 in cleaning the equipment between wells In addition to routine instrument calibration, replicates,spikes, blanks spiked blanks,and certified reference materials are routinely analyzed at method-specific Pnor to measurement,the probe tip is lowered into the well until it touches frequencies to monitor precision and bias Additional components of the bottom Using the previously established top-of-casing or top-of-box (i e. laboratory Quality Assurance/Quality Control program include wellhead vault)point,the probe cord(or halyard)is marked and a measuring tape (graduated in hundredths of a foot)is used to determine the distance between the 1 Participation in state and federal laboratory accreditation/certification probe end and the marling on the cord This measurement is then recorded on programs, the liquid-level data sheet as the"Measured Total Depth"of the well. Participation in both U S EPA Performance Evaluation studies(WS and WP studies)and inter-laboratory performance evaluation programs, When necessary in using the interface probe to measure liquid levels,the probe 3 Standard operating procedures describing routine and periodic instrument is first elecurcally grounded to either the metal stove pipe or another metal object maintenance, nearby When no ground is available, reproducible+ measurements can be 4 'Out-of-Control"ltorrectrve Action documentation procedures,and obtained by clipping the ground lead to the handle of the interface probe case S Multi-level review of raw data and client reports The probe tip is then lowered into the well and submerged in the groundwater GROUNDWATER PURGING AND SAMPLING An oscillating(beeping)tone indicates the probe is in water The probe is slowly raised until chlor the oscillating tone ceases or becomes a steady tone In either SOP-7 case this is the depth-to-water(DTW)indicator and the DTV measurement is Prior to water sampling,each well is purged by evacuating a minimum of three made accordingly The steady tone indicates floating hydrocarbons In this case, wetted well-casing volumes of groundwater When required, purging will the probe is slowly raised until the steady torte ceases This is the depth-to- continue until either the discharge water temperature, conductivity, or pH product(DTP)indicator and the measurement of DT?to recorded. A corrected stabilize, a maximum of ten well-bore volumes of groundwater have been groundwater elevation for floating hydrocarbons can be calculated by using the recovered,or the well is balled dry When practical,the groundwater sample following formula. snould be collected when the water level in the well recovers to at least 90 percent of its static level. Corrected groundwater elevation-CDTW =DTW-(SP G x LHT). CDTW=Corrected depth to water The sampling equipment consists of either a "Teflon" bailer, PVC batter or DTW = Measured depth to water stainless sisal bladder pump with a"Teflon"bladder If the sampling system is SP G= Specific gravity unweathered gasoline=0 75,dread =0 90 dedicated to the well,then the bailer is usually"Teflon,"but the bladder pump LHT= Measured liquid hydrocarbon thickness is PVC with a polypropylene bladder In generai and depending on the intended laboratory analysis,40-milliliter glass,volatile organic analysis(VOA)vials with The process of lowering and raising the probe must be repeated several tunes to "Teflon"septa,are used as sample containers 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 groundwater sample is decanted into each VOA vial in such a maturer that response,a product bailer is lowered partially through the product-water interface there is no meniscus at the top of the vial. A cap a quickly secured to the top to confum the product on the water surface,and as further indication of product of the vial The vial is then inverted and gently tapped to see if air bubbles are thickness, particularly in cases where the product layer is quite thin. This present If none are present,the vial is labeled raid refrigerated for delivery measurement is recorded on the data sheet as"product thickness' under strict chain-of-custody, to the analytical laboratory Label information oId include a unique sample identification number,Job identification number, In order to avoid cross-contamination of wells daring the liquid-level time type of analysis requested,and the samplers name measurement process,wells are measured in the order of"clean"to"duty"(where such information is evadable) In addition,all measurement equipment is cleaned For quality control purposes a duplicate water sample is collected from each with TSP or similar solution and thoroughly rinsed with deionized water before well This sample is put on hold at the laboratory When required,a inp blank use between measurements in respective wells and at the completion of the day's is prepared at the laboratory and placed in the transport cooler It is labeled use Aopis Enwonnontal InG OMR SOPa 4 5 7 121NOVEMBER 190