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�= 4- APEX ENVIROTECH, INC. STANDARD OPERATING PROCEDURES SOP-1 volatile organic compounds prior to chemical analysis. SOIL BORING SAMPLING In the event the soil samples cannot be submitted to the analytical During drilling,soil samples for chemical analysis are collected in laboratory on the same day they are collected(e.g.,due to weekends thin-walled brass tubes,of varying diameters and lengths(e.g.,4 or 6 or holidays),the samples are temporarily stored until the first inches long by 2 inches outside diameter). Three or four of the opportunity for submittal either on ice in a cooler,such as when in selected tubes,plus a spacer tube,are set in an 18-inch long split- the field,or in a refrigerator at Apex's office, barrel sampler of the appropriate inside-diameter. SOP-3 Where possible,the split-barrel sampler is driven its entire length SOIL CLASSIFICATION I either hydraulically or using a 140-pound drop hammer. The sampler is extracted from the borehole and the brass tubes,containing the Soil samples are classified according to the Unified Soil soil samples,are removed. Upon removal from the sampler,the Classification System. Representative portions of the samples may selected brass tubes are either immediately trimmed and capped be submitted,under strict chain-of-custody,to an analytical with aluminum foil or"Teflon"sheets and plastic caps or the samples laboratory for further examination and verification of the in-field are extruded from the tubes and sealed within other appropriate, classification and analysis of soil mechanical and/or petrophysical cleaned sample containers. The samples are then hermetically properties. The soil types are indicated on logs of either excavations sealed,labeled,and refrigerated for delivery,under strict chain-of- or borings together with depths corresponding to the sampling points custody,to the analytical laboratory. These procedures minimize the and other pertinent information. potential for cross-contamination and volatilization of volatile organic compounds(VOC)prior to chemical analysis. SOP-4 SAMPLE IDENTIFICATION AND CHAIN-OF-CUSTODY One soil sample collected at each sampling interval is analyzed in PROCEDURES the field using either a portable photoionization detector(PID),flame ionization detector,organic vapor analyzer,catalytic gas detector,or Sample identification and chain-of-custody procedures ensure an explosimeter. The purpose of this field analysis is to qualitatively sample integrity as well as document sample possession from the determine the presence or absence of hydrocarbons,and the time of collection to ultimate disposal. Each sample container samples to be analyzed at the laboratory. The soil sample is sealed submitted for analysis is labeled to identify the job number,date,time in either a brass tube,glass jar,or plastic bag to allow for some of sample collection,a sample number unique to the sample,any in- volatilization of VOC. The PID is then used to measure the field measurements made,sampling methodology,name(s)of on- concentrations of hydrocarbons within the containers's headspace. site personnel,and any other pertinent field observations also The data is recorded on both field notes and the boring logs at the recorded on the field excavation or boring log. depth corresponding to the sampling point. Chain-of-custody forms are used to record possession of the sample Other soil samples are collected to document the soit and/or from time of collection to arrival at the laboratory. During shipment, stratigraphic profile beneath the project site,and estimate the relative the person with custody of the samples will relinquish them to the permeability of the subsurface materials. All drilling and sampling next person by signing the chain-of-custody form(s)and noting the equipment are either steam cleaned or washed in solution and date and time. The sample-control officer at the laboratory will verity doubly rinsed in deionized water prior to use at each site and sample integrity,correct preservation,confirm collection in the proper between boreholes to minimize the potential for cross-contamination. container(s),and ensure adequate volume for analysis. i In the event the soil samples cannot be submitted to the analytical If these conditions are met,the samples will be assigned unique laboratory on the same day they are collected(e.g.,due to weekends laboratory log numbers for identification throughout analysis and or holidays),the samples are temporarily stored until the first reporting. The log numbers will be recorded on the chain-of-custody opportunity for submittal either on ice in a cooler,such as when in forms and in the legally-required log book maintained in the the field,or in a refrigerator at Apex's office. laboratory. The sample description,date received,client's name, and any other relevant information will also be recorded. 50P-2 SOIL EXCAVATION AND SAMPLING SOP-5 Excavation and subsequent soil sampling is performed under the LABORATORY ANALYTICAL QUALITY ASSURANCE AND direction of a registered geologist or civil engineer. To reduce the CONTROL potential for cross-contamination,all excavation equipment is either steam cleaned or washed prior to use and between excavations. In addition to routine instrument calibration,replicates,spikes, Soil samples for chemical analysis are collected in cleaned,thin- blanks,spiked blanks,and certified reference materials are routinely walled brass tubes of varying diameters and lengths(e.g.,6 inches analyzed at method-specific frequencies to monitor precision and long by 2 inches outside diameter)or other appropriate cleaned bias. Additional components of the laboratory Quality sample container. If used,one tube may be set in a 2-inch inside Assurance/Quality Control program include: diameter,hand-driven sampler. To reduce the potential for cross- contamination between samples,the sampler is washed in a solution 1, Participation in state and federal laboratory and doubly rinsed between each sampling event. accreditation/certification programs; Upon recovery,a portion of the soil sample is sealed for later 2. Participation in both U.S:EPA Performance Evaluation screening with either a portable photoionization detector,flame studies(WS and WP studies)and inter-laboratory ionization detector,or an explosimeter. Another portion of the performance evaluation programs; sample is used for description of the excavated materials, A third portion of the sample is hermetically sealed,labeled and refrigerated 3. Standard operating procedures describing routine and for delivery,under strict chain-of-custody,to the analytical laboratory. periodic instrument maintenance; These procedures minimize the potential for crass-contamination and volatilization of