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r APEX ENVIROTECH, INC, STANDARD OPERATING PROCEDURES 4 eraton & Maintenance O&M SOP-4 SAMPLE IDENTIFICATION AND CHMN- w OF-CUSTODY PROCEDURES water temperature,conductivity,or pH stabilize a maximum of ten wetted-casing volumes of groundwater have been o' recovered,or the well is bailed dry When practical the Sample identification 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 80 percent of its static level the time of collection to ultimate disposal Each sample container submitted for analysis is labeled to identify the job The sampling equipment consists of ether a"Teflon"bailer, 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 measurements made, bladder if the sampling system is dedicated to the well,then sampling methodology name(s)of on-site personnel and any the bailer is usual[y'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 excavabon or boring log intended laboratory analysis 40-milliliter glass volatile organic analysis(VOA)vials with"Teflon' septa are used as sample Chain-of-custody forms are used to record possession of the containers sample from time of collection to arrival at the laboratory During shipment,the person with custody of the samples will The groundwater sample is decanted into each VOA via]in relinquish them to the next person by signing the chain-of- such a manner that there is no meniscus at the top of the Hal custody form(s)and noting the date and time The sample- A cap is quickly secured to the top of the via] The vial is then control officer at the laboratory will verity sample Integrity inverted and gently tapped to see if atr bubbles are present It 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 delnery,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,lob 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-required 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 received client s name,and any other relevant information 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 bythe laboratory along with LABORATORY ANALYTICAL QUALITY 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 mashed 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 in-field cleaning procedures to prevent cross-contamination Qualty Assurance/Quality Control program include To minimize the potential for cross-contamination between 1 Participation in state and federal laboratory wells,all well development and water sampling equipment not accreditation/certification programs, dedicated to a wall is either steam cleaned or property washed between use Asa secondary precautionary measure wells 2 Participation in both U S EPA Performance are sampled in order of least to highest concentrations as Evaluation studies(WS and WP studies)and inter- established by evadable previous analytical data laboratory performance evaluation programs, In the event the water samples cannot be submitted to the 3 Standard operating procedures describing routine analyboal laboratory on the same day they are collected(e g, and periodic instrument maintenance, due to weekends or holidays),the samples are temporarily stored until the first opportunity for submittal either on water lee 4 "Out-of-Control"/Corrective Action documentation in a cooler,such as when in the field or in refrigerator at procedures,and, Apexes office 5 Multilevel review of raw data and client reports SOP-8 VAPOR SAMPLING: 'TEDLAR' BAG 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 approximately 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