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i APEX FWARCTECH, INC. STANDARD OPERATING PROCEDURES Oaembon&Mgrrten@M(OM SOP-4 SAMPLE IDENTIPfICATION AND CHAIN- water temperature,conductivity,or pH stabilize,a mmomum of OF-CUSTODY PROCEDURES ten wafted-casing volumes of groundwater have been recovered,or the well is bailed dry When practical,the Sample iderdifk abon and chain-of-custody procedures ensure groundwater sample should be collected when the water level sample integrity as well as document sample possession from In the well recovers to at least BD percent of its static level the time of collection to ultimate disposal Each sample container submitted for analysis is labeled to identifythe fob The sampling equipment consists of either a"Teflon"hailer, number,date,time of sample collection a sample number PVC bailer,or stainless steel bladder pump with a'Teflon" unique to the sample any in-field measurerttents made bladder If the sampling system is dedicated to the wall,then sampling methodology,name(s)of on-site personnel,and any the bailer is usually"Teflon,"but the bladder pump is PVC with other pertinent field observations also recorded on the field a polypropylene bladder In general and depending on the excavation or boring log Intended laboratory analysis 40-milliliter glass,volatile organic analysis(VOA)vsais with"Teflon"septa are used as sample Cham-of-custody fortes are used to record possession of the containers sample from time of collechon to omvel at the laboratory During shipment,the person with custody of the samples will The groundwater sample is decanted into each VOA vial in relinquish them to the nein person by signing the chain-of- such a manner that there is no meniscus at the top of the vial custody fomn(s)and noting the date and bme The sample- A cap is quickly secured to the top of the vie[ The vial is then control officer at the laboratory will venfy sample Integrity Inverted and gentiytapped to see If air bubbles are present If correct preservation confirm collection in the proper none are present the vial is labeled and refrigerated for container(s),and ensure adequate volume for analysis delivery under strict chain-of-custody to the analytical laboratory Label information should Include a unique sample If these conditions are met the samples will be assigned Identification number fob identification number date time,type unique laboratory log numbers for Identification throughout of analysis requested and the sampler's name analysis and reporting The log numbers will be recorded on the chain-of-custody forms and In the legally-reywred log book For quality control purposes,a duplicate water sample Is maintained in the laboratory The sample description,date collected from each well This sample may also be analyzed or recerved clients name and any other relevant intormation will put on hold at the laboratory When required a trip blank also be recorded prepared at the laboratory,is placed in the transport cooler It is labeled similar to the well samples remains in the cooler SOP-5 during transport and is analyzed by the laboratory along with LABORATORY ANALYTICAL QUAI.ITIP the groundwater samples In addition a field blank may be ASSURANCE AND CONTROL prepared in the field when sampling equipment is not dedicated The field blank is prepared after a pump or bailer In addition to routine instrument calibration replicates spikes, has been either steam cleaned or properly washed prior to use blanks,spiked blanks and certified reference materials are in the next well,and is analyzed along with the other samples routinely analyzed at method-specific frequencies to monitor The field blank analysis demonstrates the effectiveness of the precision and bias Additional components of the laboratory infield cleaning procedures to prevent cross-contamination Quality Assurance/Quality Control program include To minimize the potential for cross-corsaminstion between 1 Participabon In state and federal laboratory wells, all well development and water sampling equipment not acoreditation/certification programs, dedicated to a well is either steam cleaned or properly washed between use As a secondary precautionary measure wells 2 Partirapetion 4n both US EPA Performance are sampled in order of least to highest concentrations as Evaluation studies(W5 and WP studies)and inter- established by available previous analytical data laboratory performance evaluation programs, In the event the water samples cannot be submitted to the 3 Standard operating procedures describing routine analytical laboratory on the same day they are collected(e g, and periodic instrument maintenance due to weekends or holidays) the samples are temporarily stoned until the first opportunity for submittal either on water ice 4 "Out-of-Control"/Corrective Action documentation in a cooisr such as when in the field or in refrigerator at procedures and AWs office 5 Multi-level review of raw data and client reports SOP-9 VAPOR SAMPLING : " IML.AR" SAG SAMPLING TECHNIQUE SOP-7 Prior to vapor sampling,the vacuum system must reach a GROUNDWATER PURGING AND stabilized air flow(cubic feet per minute)for approwmately 15 SAMPLING minutes Prior to the actual collection of the vapor sample the following data is recorded air flow,temperature,and pressure Prior to water sampling,each well is purged by evacuating a at collection ports and gauges minimum of three wetted well-casing volumes of groundwater When required,purging will continue until either the discharge