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APEX ENVIROTECH, INC. STANDARD OPERATING PROCEDURES Soil Borings SOP-4 SOP-7 SAMPLE IDENTIFICATION AND CHAIN- SOIL BORING SAMPLING OF-CUSTODY PROCEDURES During drilling sod samples for chemical analysts are collected Sample identification and chain-of-custody procedures ensure in thin-walled brass tubes,of varying diameters and lengths sample integrity as well as document sample possession from (e g,4 or 6 inches long by 2 inches outside diameter) Three the time of collection to ultimate disposal Each sample or four of the selected tubes,plus a spacer tube,are set in an container submitted for analysis is labeled to identify the lob 18-inch long split-barrel sampler of the appropriate inside- number,date,time of sample collection,a sample number diameter unique to the sample,any in-field measurements made, sampling methodology name(s)of on-site personnel and any Where possible the split-barrel sampler is driven its entire other pertinent field observations also recorded on the field ' length either hydraulically or using a 140-pound drop hammer excavation or boring log The sampler is extracted from the borehole and the brass tubes,containing the soil samples,are removed Upon removal Cham-of-custody forms are used to record possession of the from the sampler,the selected brass tubes are either sample from time of collection to arrival at the laboratory immediately trimmed and capped with aluminum foil or"Teflon" During shipment,the person with custody of the samples will sheets and plastic caps or the samples are extruded from the relinquish them to the next person by signing the chain-of- tubes and sealed within other appropriate,cleaned sample custody form(s)and noting the date and time The sample- containers The samples are then hermetically sealed,labeled, control officer at the laboratory will verify sample integrity, and refrigerated for delivery,under strict chain-of-custody,to correct preservation,confirm collection in the proper ' the analytical laboratory These procedures minimize the container(s),and ensure adequate volume for analysts potential for cross-contamination and volatilization of volatile organic compounds(VOC)prior to chemical analysis If these conditions are met,the samples will be assigned unique laboratory log numbers for identification throughout One soil sample collected at each sampling interval is analyzed analysis and reporting The log numbers will be recorded on In the field using either a portable photoionization detector the chain-of-custody forms and in the legally-required log book (PID),flame ionization detector,organic vapor analyzer, maintained in the laboratory The sample description date catalytic gas detector,or an ex plosimeter The purpose of this received,client's name,and any other relevant information will M field analysts is to qualitatively determine the presence or also be recorded absence of hydrocarbons and the samples to be analyzed at the laboratory The sod sample is sealed in ether a brass tube, SOP-5 glass jar,or plastic bag to allow for some volatilization of VOC LABORATORY ANALYTICAL gUALITY The PID is then used to measure the concentrations of ASSURANCE AND CONTROL ' hydrocarbons within the containers's headspace The data is recorded on both field notes and the boring logs at the depth In addition to routine instrument calibration,replicates,spikes corresponding to the sampling point blanks,spiked blanks,and certified reference materials are routinely analyzed at method-specific frequencies to monitor Other soil samples are collected to document the soil andlor precision and bias Additional components of the laboratory stratigraphic profile beneath the project site,and estimate the Quality Assurance/Quality Control program include relative permeability of the subsurface materials All drilling and sampling equipment are ether steam cleaned or washed in 1 Participation in state and federal laboratory ' soiuhon and doubly rinsed in deionized water prior to use at sccreddation/certification programs, each site and between boreholes to minimize the potential for cross-contamination 2 Participation in both U S EPA Performance Evaluation studies(WS and WP studies)and inter- In the event the soil samples cannot be submitted to the laboratory performance evaluation programs, ' 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 until the first opportunity for submittal ether on ice in a and periodic instrument maintenance, cooler,such as when In the field or in a refrigerator at Apexes ' office 4 "Out-of-Control'ICorrective Action documentation SOP-3 procedures,and, SOIL CLASSIFICATION 5 Multi-level review of raw data and client reports ' Sod samples are classified according to the Unified Sod Classification System Representative portions of the samples may be submitted,under strict chain-of-custody,to an analytical laboratory for further examination and venficabon of the in-field classification and analysts of sod mechanical and/or petrophystcal 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 1