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APF_X ENVI ROTECH, INC. 3116-inch diameter polyethylene tubing. The soil vapor screens STANDARD OPERATING PROCEDURES will be installed to the spec€ficized depth. The soil vapor Soil Vapor Sampling screen should be surrounded by sand and the polyethylene tubing sealed to surface using a bentonite plug. The subsurface polyethylene tubing should be connected to a 'Tedlar bag of known volume located within a vacuum SOP-4 sampling chamber such that no cross contamination occurs SAMPLE IDENTIFICATION AND CHAIN- between the vacuum source and the`Tedlar'bag. A vacuum OF-CUSTODY PROCEDURES should be applied to the vacuum sampling chamber such that three tubing and vapor screen volumes are purged prior to Sample identification and chain-of-custody procedures ensure sample collection. For sample collection,a new Tedlar bag sample integrity as well as document sample possession from should be used. The"Ted lar'bag should be filled to 314 of the time of collection to ultimate disposal. Each sample volume capacity. Caution should be taken not to overfill the container submitted for analysis is labeled to identify the job sampling bag. The sample is placed in a non-refrigerated dry number,date,time of sample collection,a sample number cooler with sufficient packing to eliminate damage during unique to the sample,any in-rield measurements made, transport. Cooling samples should be avoided since sampling methodology,name(s)of on-site personnel,and any condensation of moisture within the sample may occur, other pertinent field observations also recorded on the field distorting laboratory analysis. excavation or boring log. For quality control purposes,a duplicate vapor sample may be Chain-of-custody forms are used to record possession of the collected from each sampling port. This sample is then put on sample from time of collection to arrival at the laboratory. hold at the laboratory pending initial analysis. During shipment,the person with custody of the samples will relinquish them to the next person by signing the chain-of- Vapor samples are subject to very limited holding times, custody form(s)and noting the date and time. The sample' typically 48 hours. Thus,care must taken to avoid delays in control officer at the laboratory will verify sample integrity, submittal of vapor samples to the laboratory. In the event the correct preservation,confirm collection in the proper vapor samples cannot be submitted to the analytical laboratory container(s),and ensure adequate volume for analysis, on the same day they are collected,they are to be temporarily stored in the dry,non-refrigerated,packed cooler until the very If these conditions are met,the samples will be assigned first opportunity for submittal well within the required holding unique laboratory log numbers for identification throughout time,taking into account the time needed for shipment to and analysis and reporting. The log numbers will be recorded on receipt by the laboratory, the chain-of-custody forms and in the legally-required log book maintained in the laboratory. The sample description,date received,client's name,and any other relevant information will also be recorded. SOP-S %W,/ LABORATORY ANALYTICAL QUALITY ASSURANCE AND CONTROL In addition to routine instrument calibration,replicates,spikes, blanks,spiked blanks,and certified reference materials are routinely analyzed at method-specific frequencies to monitor precision and bias. Additional components of the laboratory Quality Assurarnce/Quality Control program include: 1. Participation in state and federal laboratory accreditationlcertifiication programs; 2. Participation in both U.S.EPA Performance Evaluation studies(WS and WP studies)and inter- laboratory performance evaluation programs; 3. btandard operating procedures describing routine and periodic instrument maintenance; 4. "Out-of-Control"/Corrective Action documentation procedures;and, 5. Mufti-level review of raw data and client reports. SOP-1:3 SOIL VAPOR SAMPLING; 'TEDLAR" BAG SAMPLING TECHNIQUE Prior to soil vapor sampling,soil vapor screens must be installed. Soil vapor screens wi€f typically consist of a 6-inch long by'/cinch diameter stainless steel screen attached to a