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SArtPLE IDFNTJFICATION AND CHAQV-OF-C'UST'ODY PROCEDURES demonstrates the effectiveness of in-field cleaning procedures to prevent cross SOP—! 4, . contamination Sample identification and chamrof-custody procedures ensure sample integrity, and document sample possession from the time of collection to its ultimate To minimize the potential for cross-contamination between wells, all well disposal Each sample container submitted for analysis a labeled to identify the development and water sampling equipment not dedicated to a well is either lob number, date, time of sample collection, a sample number unique to the steam cleaned or properly washed between use As a second precautionan Sample any name(s) of on-site personnel and any other pertinent field measure wells are sampled in order of lowest to highest concentrations as observations also recorded on the field excavation or boring log established by available previous analytical data Chain-of-custody fomts are used to record possession of the sample from time of In the event the water samples cannot he submitted to the analytical Iaboraton collev tion to its arrival at the laboratory During shipment, the person with on the same day they are collected (e g, due to weekends or holidays) tit, custod-. of the samples will relinquish them to the next person by signing the samples are temporarily stored until the fust opportunity for submittal either on Jhaur-of custody form(s) and noting the date and time The sample-control ice in a cooler such as when in the field or in a refrigerator oil icer at the laboratory will venfy sample mtegnty,cornet preservation confirm Lollection in the proper contamer(s) and ensure adequate volume for analysis MEASURING LIQUID LEVELS USING WATER LEVEL INDICATOR OR INTERFACE PROBE If these conditions are met,the samples will be assigned unique laboratory log SOP-12 numbers for identification throughout analysis and reporting The log numbers Field equipment used for]squid-level gauging typically includes the measuring %%ill be recorded on the chain-of-custody forms and in the legally-required log probe(water level or interface)and a clean product bailer(s) The field kit also hook maintained in the laboratory The sample description,date received,client's includes cleaning supplies(buckets,TSP spray bottles,and detonized water)to name and any other relevant information will also be recorded be used in cleaning the equipment between wells LABORATORY ANALYTICAL QUALIFY ASSURANCE AND CONTROL Prior to measurement, the probe tip is lowered into the well until it touches SOP-5 bottom Using the previously established top-of-casing or top-of boa (t c In addition to routine instrument calibration replicates spikes, blanks, spiked wellhead vault)point,the probe cord(or halyard)is marked and a measuring taps blanks and certified reference materials are routinely analyzed at method-specific (graduated in hundredths of a foot)is used to determine the distance between th, frequencies to monitor precision and blas Additional components of the probe end and the marking on the cord This measurement is then recorded on I iboraton Quality Assurance/Quality Control program include the liquid-level data sheet as the Measured Total Depth'of the well 1 Partiwpation in state and federal laboratory accreditation/certification When necessary in using the interface probe to measure liquid levels the prob, programs, is first electrically grounded to either the metal stove pipe or another metal object 2 Participation in both U S EPA Performance Evaluation studies (WS and nearby When no ground is available, reproducible measurements can be WP studies)and inter-laboratory performance evaluation programs obtained by clipping the ground lead to the handle of the interface probe case I Standard operating procedures describing routine and periodic instrument maintenance The probe tip is then lowered into the well and submerged in the groundwater 4 Out-of-Control"/Corrective Action documentation procedures and, An oscillating(beeping)tone indicates the probe is in water The probe is siowlv btulti-level review of raw data and client reports raised until either the oscillating tone ceases or becomes a steady tone In either �,. case,this is the depth-to-water(DTW)indicator and the DTW measurern6ni rs GROUNDWATER PURGING AND SAMPLING made accordingly The steady tone indicates floating hydrocarbons In this cash, SOP 7 the probe is slowly raised until the steady tone ceases This is the depth to Prior to water sampling,each well is purged by evacuating a minimum of three product(DTP)indicator and the measurement of DTP is recorded 4 corrected %%etied well-casing volumes of groundwater When required, purging will depth to groundwater to account for floating hydrocarbons can be calculated b% continue until either the discharge water temperature conductivity,orpHstabiltze using the following formula to %Whin 10% of previously measured values, and a maximum of ten wetted basing volumes of groundwater have been recovered or the well is bailed dry CDTW = DTW-(SP G x LHT) IU lien practical,the groundwater sample should be collected when the water level CDTW =Corrected depth to groundwater in the well recovers to at least 80 percent of its static levet Field measurements DTR' =Measured depth to groundwater observations and procedures are noted SP G=Specific gravity unweathered gasoline=0 75 diesel -0 80 LHT M Measured liquid hydrocarbon thickness The sampling equipment consists of a clean bailer,or stainless steel bladder pump with a Teflon"bladder If the sampling system is dedicated to the well,then the The corresponding groundwater elevation is the difference between a previously bailer is usually "Teflon," but the bladder pump may be PVC with a determined well reference elevatton and either the depth to groundwater or thL poly propylene bladder Sample container type,preservation,and volume depends corrected depth to groundwater on the intended analyses The process of lowering and raising the probe must be repeated several times to I he groundwater sample is decanted into each VOA vial in such a manner that ensure accurate measurements The DTW and DTP measurements are recorded there is no meniscus at the top of the vial A cap is quickly secured to the top on the liquid-level data sheet When floating product is indicated by thL probe, til the N r It The vial is then inverted and gently tapped to see if air bubbles are response,a product bailer is lowered partially through the product-water interfact present if none are present, the vial is labeled and refrigerated for dehver�, to confirm the product on the water surface and as further indication of product under strict chain-of-custody, to the analytical laboraton Label information thickness particularly in cases where the product laver is quite thin Eaher this should include a unique sample identification number,job identification number, measurement or the difference between DTW and DTP is recorded on the data d tie time and the sampler's initials sheet as'product thickness ' Ior quality control purposes,a duplicate water sample may be collected from a In order to avoid cross-contamination of wells during the liquid-level u ell When required a trip blank is prepared at the laboratory and placed in the measurement process,wells are measured in the order of"clean"to duty (where transport cooler It is labeled similar to the well samples remains in the cooler such information is available) In addition,all measurement equipment as cleaned during transport,and is analyzed by the laboratory along with the groundwater with TSP or similar solution and thoroughly rinsed with deionized water before *,!quipment amples In addition a field blank may be prepared in the field when sampling rue,between measurements in respective wells,and at the completion of the day s is not dedicated The field blank is prepared after a pump or bailer activities has hecn either steam cleaned or properly washed prior to use in the next well, and i. analyzed along with the other samples The field blank analysis c , a i Fugro QMR SOPS 4 5 7 1211994 � i