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V WESTERN RESOURCE MANAGEMENT STANDARD OPERATING PROCEDURES Soil Vapor Sampling TEMPORARY SOIL VAPOR PROBE INSTALLATION Soil vapor probes will be installed by drilling a shallow boring SAMPLE IDENTIFICATION AND CHAIN-OF- to a minimum of 5-feet below ground surface. The drilling CUSTODY PROCEDURES rod will act as a temporary casing with disposable Sample identification and chain-of-custody procedures polyethylene tubing threaded through the drill rods to a ensure sample integrity as well as document sample retractable screen section in the drill tip. The annular space - possession from the time of collection to ultimate disposal. will be sealed with bentonite which will be allowed to hydrate Each sample container submitted for analysis is labeled to for approximately 20 minutes prior to system purging and identify the job number, date, time of sample collection, a sample collection. Modeling clay or equivalent will be used sample number unique to the sample, any in-field to form an air tight seal around the drill rod at the ground measurements made, sampling methodology, name(s) of surface. Sufficient tubing will be exposed to allow for on-site personnel,and any other pertinent field observations extraction of soil vapor by an air sampling pump. Excess also recorded on the field excavation or boring log. Chain- tubing will be Where soil vapor samples are required from of-custody forms are used to record possession of the multiple depths, the probe rod will be driven to each sample from time of collection to arrival at the laboratory. designated sampling depth and sealed with hydrated During shipment,the person with custody of the samples will bentonite prior to purging and collection of each soil vapor relinquish them to the next person by signing the chain-of- sample. custody form(s) and noting the date and time. The sample control officer at the laboratory will verify sample integrity, SOIL VAPOR PROBE PURGING AND SAMPLING correct preservation, confirm collection in the proper The soil vapor sampling protocols will be implemented in container(s), and ensure adequate volume for analysis. If accordance with the California Department of Toxic these conditions are met, the samples will be assigned Substances Control(DTSC)Guidance for the Evaluation and unique laboratory log numbers for identification throughout Mitigation of Subsurface Vapor Intrusion to Indoor Air,dated analysis and reporting.The log numbers will be recorded on December 15,2004(revised February 7,2005). Prior to soil the chain-of-custody forms and in the legally-required log vapor sampling, each temporary soil vapor probe is purged book maintained In the laboratory. The sample description, by evacuating a minimum of three system volumes using an date received, client's name, and any other relevant air pump adjusted to provide a constant flow rate of less than information will also be recorded. 200 milliliters per minute at a pressure of less than 25 inches of water column. Once the system has been purged, LABORATORY ANALYTICAL QUALITY ASSURANCE samples are extracted from the vapor probe using a syringe, AND CONTROL glass bulb,Summa's canister or are captured and stored in a In addition to routine instrument calibration, replicates, Tedlar bag at the same flow rate and pressure used for spikes, blanks, spiked blanks, and certified reference purging. Immediately prior to sampling, a tracer gas materials are routinely analyzed at method-specific (typically 1,1-diflouroethane)is applied to the drill rod at the frequencies to monitor precision and bias. Additional ground seal to check seal integrity and to the sample components of the laboratory Quality Assurance/Quality manifold to evaluate ambient air intrusion. Control program include: SOIL PROBE BORING ABANDONMENT 1. Participation in state and federal laboratory Upon completion of soil vapor sampling activities, drilling accreditation/certification programs; rods will be removed from the boring and the borehole will 2 Participation in both U.S. EPA Performance Evaluation be abandoned by filling it for its entire depth with a neat studies (WS and WP studies) and inter-laboratory cement grout in accordance with applicable regulatory performance evaluation programs; guidelines. 3. Standard operating procedures describing routine and VAPOR SAMPLE DELIVERY periodic instrument maintenance; Following vapor sampling, the sample containers are 4. "Out-of-Control"/Corrective Action documentation transported under chain-of-custody documentation to an procedures;and, ELAP accredited laboratory for analysis within the applicable holding time for the sample method and containers used. 5. Multi-level review of raw data and client reports.