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APEX ENVIROTECH, INC. STANDARD OPERATING PROCEDURES *_ Soil Barings � I SOP-4 ' SOP-1 SAMPLE IDENTIFICATION AND CHAIN- j SOIL BORING SAMPLING OF-CUSTODY PROCEDURES During drilling,soil samples for chemical analysis are- Sample identification and chain-of-custody procedures collected in thin-walled brass tubes,of varying diameters and ensure sample integrity as well as document sample f lengths(e.g.,4 or 6 inches long by 2 inches outside possession from the time of collection to ultimate disposal. diameter). Three or four of the selected tubes,plus a spacer Each sample container submitted for analysis is labeled to tube,are set in an 16-inch long split-barrel sampler of the identify the job number,date,time of sample collection,a appropriate inside-diameter, sample number unique to the sample,any in-field measurements made,sampling methodology,name(s)of on- Where possible,the split-barrel sampler is driven its entire site personnel,and any other pertinent field observations length either hydraulically or using a 140-pound drop also recorded on the field excavation or boring log. hammer. The sampler is extracted from the borehole and the + brass tubes,containing the soil samples,are removed. Upon Chain-of-custody forms are used to record possession of the a removal from the sampler,the selected brass tubes are sample from time of collection to arrival at the laboratory. either immediately trimmed and capped with aluminum foil or During shipment,the person with custody of the samples will f 'Teflon"sheets and plastic caps or the samples are extruded relinquish them to the next person by signing the chain-of- from the tubes and sealed within other appropriate,cleaned custody form(s)and noting the date and time. The sample- sample containers. The samples are then hermetically control officer at the laboratory will verify sample integrity, sealed,labeled,and refrigerated for delivery,under strict correct preservation,confirm collection in the proper chain-of-custody,to the analytical laboratory. These container(s),and ensure adequate volume for analysis.— procedures minimize the potential for cross-contamination and volatilization of volatile organic compounds(VOC)prior If these conditions are met,the samples will be assigned to chemical analysis. unique laboratory log numbers for identification throughout analysis and reporting. The log numbers will be recorded on One soil sample collected at each samplirig interval is the chain-of-custody forms and in the legally-required log analyzed in the field using either a portable photoionization book maintained in the laboratory. The sample description, detector(PID),flame ionization detector,organic vapor date received,client's name,and any other relevant analyzer,catalytic gas detector,or an explosimeter. The information will also be recorded. i purpose of this field analysis is to qualitatively determine the presence or absence of hydrocarbons,and the samples to be SOP-5 +, analyzed at the laboratory. The soil sample is sealed In LABORATORY ANALYTICAL,QUALITY } either a brass tube,glass jar,or plastic bag to allow for same ASSURANCE AND CONTROL volatilization of VOC. The PID is then used to measure the concentrations of hydrocarbons within the containers's In addition to routine instrument calibration,replicates, f headspace. The data is recorded on both field notes and the spikes,blanks,spiked blanks,and certified reference boring logs at the depth corresponding to the sampling point, materials are routinely analyzed at method-specific frequencies to monitor precision and bias. Additional Other soil samples are collected to document the soil and/or components of the laboratory Quality Assurance/Quality I stratigraphic profile beneath the project site,and estimate the Control program include: relative permeability of the subsurface materials. A1I drilling i and sampling equipment are either steam cleaned orwashed 1. Participation in state and federal laboratory t in solution and doubly rinsed in deionized water prior to use accreditation/certification programs; at each site and between boreholes to minimize the potential i for cross-contamination. 2. Participation In both U.S.EPA Performance In the event the sail samples cannot be submitted to the Evaluation studies(WS and WP studies)and Inter- analytical laboratory on the same day they are collected(e.g., due to weekends or holidays),the samples are temporarily 3. Standard operating procedures describing routine stored untii the first opportunity for submittal either an Ice In a and periodic Instrument maintenance; cooler,such as when in the field,or in a refrigerator at Apex's office. 4. "Out-of-Control'%Corrective Action documentation j 50P-3 procedures;and, i SOIL CLASSIFICATION 5. Multi-level review of raw data and client reports. 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 j 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.