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APIEX ENVIROTECH, INC. STANDARD OPERATING PROCEDURE Excavation I UST Remov I If these conditions are met,the samples will be assigned unique laboratory log numbers for identification throughout err analysis and reporting. The log numbers will be recorded on SOP - 2 the chain-of-custody forms and in the legally-required log book SOIL EXCAVATION ANIS SAMPLING maintained in the laboratory. The sample description,date Excavation and subsequent soil sampling Is performed under received,client's name,and any other relevant information will also be recorded. the direction of a registered geologist or civil engineer. To reduce the potential for cross-contamination,all excavation equipment is either steam cleaned or washed prior to use and SOP - 5 between excavations. Soil samples for chemical analysis are LABORATORY ANALYTICAL QUALITY collected in cleaned,thin-walled brass tubes of varying ASSURANCE AND CONTROL diameters and lengths(e.g.,6 inches long by 2 inches outside diameter)or other appropriate cleaned sample container. If In addition to routine instrument calibration,replicates,spikes, used,one tube may be set in a 2-inch inside diameter,hand- blanks,spiked blanks,and certified reference materials are driven sampler. To reduce the potential for cross- contamination between samples,the sampler is washed in a routinely analyzed at method-specific dnal cofrequencies la monitor solution and doubly rinsed between each sampling event. precision and bias. Additional components of the laboratory Quality Assurance/Quality Control program include: Upon recovery,a portion of the soil sample is sealed for later Participation in state and federal laboratory screening with either a portable photoionization detector,flame accreditationlcertification programs; ionization detector,or an explosimeter. Another portion of the sample is used for description of the excavated materials. A 2. Participation in both U.S.EPA Performance third portion of the sample is hermetically sealed,labeled andEvaluation studies(WS and WP studies)and inter- refrigerated for delivery,under strict chain-of-custody,to the laboratory performance evaluation programs; analytical laboratory. These procedures minimize the potential for cross-contamination and volatilization of volatile organic g Standard operating procedures describing routine compounds prior to chemical analysis. and periodic instrument maintenance; In the event the soil samples cannot be submitted to the q. "Out-of-Control"/Corrective Action documentation analytical laboratory on the same day they are collected(e.g., procedures;and, due to weekends or holidays),the samples are temporarily stored until the first opportunity for submittal either on ice in a S. Multi-level review of raw data and client reports. cooler,such as when in the field,or in a refrigerator at Apex's office. SOP - 3 SOIL CLASSIFICATION Soil samples are classified according to the Unified Soil Classification System. Representative portions of the samples may be submitted,under strict chain-of-custody,to an analytical laboratory for further examination and verification of the in-field classification and analysis of soil mechanical andlor petrophysical properties. The soil types are indicated on logs of either excavations or borings together with depths corresponding to the sampling points and other pertinent information. SOP - 4 SAMPLE IDENTIF[CATION AND CHAIN- OF-CUSTODY PROCEDURES Sample identification and chain-of-custody procedures ensure sample integrity as well as document sample possession from the time of collection to ultimate disposal. Each sample container submitted for analysis is labeled to identify the job number,date,time of sample collection,a sample number unique to the sample,any in-field measurements made, sampling methodology,name(s)of on-site personnel,and any other pertinent field observations also recorded on the field excavation or boring log. Chain-of-custody forms are used to record possession of the sample from time of collection to arrival at the laboratory. During shipment,the person with custody of the samples will relinquish them to the ne)d person by signing the chain-of- custody form(s)and noting the date and time. The sample- control officer at the laboratory will verify sample integrity, correct preservation,confirm collection in the proper co"ner(s),and ensure adequate volume for analysis.