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APEX ENVIROTECH, INC. — STANDARD OPERATING PROCEDURES S011 Borings SOP-4 SOP.-I SAMPLE IDENTIFICATION AND CHAIN- SOIL BORING SAMPLING OF-CUSTODY PROCEDURES During drilling soil samples for chemical analysts 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 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 analysts is labeled to tube,are set in an 18-inch long split barrel sampler of the identify the lob number,date,time of sample collection,a appropriate inside-diameter sample number unique to the sample,any to-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 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 "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 analysts unique laboratory log numbers for identification throughout analysis and reporting The log numbers will be recorded an One soil sample collected at each sampling 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 purpose of this field analysts 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 LAC30RATORY ANALYTICAL QUALiTY ether a brass tube,glass far,or plastic bag to allow for some ASSURANCE AND CONTROL volatillzation of VOC The PID is then used to measure the concentrations of hydrocarbons within the containers's In addition to routine instrument calibration,replicates, 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 stratigraphic profile beneath the project site,and estimate the Control program include relative permeability of the subsurface materials All drilling and sampling equipment are either steam cleaned or washed 1 Participation In state and federal laboratory in solution and doubly rinsed in detonized water prior to use accreditation/certification programs, at 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 either on fee 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 procedures,and, SOP-3 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 verification of the In-field classification and analysis of soil mechanical and/or 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