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APEX ENV]ROTECH, INC. .. STANDARD OPERATING PROCEDURES Soil Sampling SOP - 2 SOP - 5 SOIL iEXCAVATION AND SAMPLING LABORATORY ANALYTICAL QUALITY ASSURANCE AND CONTROL Excavation and subsequent soil sampling is performed under the direction of a registered geologist or civil engineer. To In addition to routine instrument calibration,replicates, reduce the potential for cross contamination,all excavation spikes,blanks,spiked blanks,and certified reference equipment is either steam cleaned or washed prior to use materials are routinely analyzed at method-specific and between excavations. Soil samples for chemical frequencies to monitor precision and bias. Additional analysis are collected in cleaned,thin-walled brass tubes of components of the laboratory Quality Assurance/Quality varying diameters and lengths(e.g.,6 inches tong by 2 Control program include; inches outside diameter)or other appropriated cleaned sample container. If used,one tube may be set in a 2-inch f. Participation in state and federal laboratory inside diameter,hand-driven sampler. To reduce the accreditatioNcer0scation programs; potential for cross-contamination between samples,the sampler is washed in a solution and doubly rinsed between 2. Participation in both U.S.EPA Performance each sampling event. Evaluation studies(WS and WP studies)and interlaboratory performance evaluation programs; Upon recovery, a portion of the soil sample is sealed for later screening with either a portable photoianization 3. Standard operating procedures describing routine detector,flame ionization detector,or an explosimeter, and periodic instrument maintenance; Another portion of the sample is used for description of the excavated materials. A third portion of the sample is 4. "Out-of-ControllCarrective Action documentation hermetically sealed,iabeled.and refrigerated for delivery, procedures;and. under strict chain-of-custody,to the analytical laboratory. These procedures minimize the potential for cross- 5. Mufti-level review of raw data and client reports, contamination and volatilization of volatile organic compounds prior to chemical analysis. In the event the soil samples cannot be submitted to the analytical laboratory on the same day they are collected(e.g. due to weekends or holidays),the samples are temporarily stared until the first opportunity for submittal either on Ice in a cooler,such as when in the field,or in a refrigerator at Apex's office. SOP - .4 SAMPLE IDENTIFICATION AND CHAIN- OF-CUSTODY PROCEDURES Sample identification and chain-0f-custodyprocedures t 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-0f-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 next 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 container(s),and ensure adequate volume for analysis. If these conditions are met,the samples will be assigned unique laboratory fog numbers for identification throughout analysis and reporting. The log numbers will be recorded on 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.