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��.. %"NO, INC. sampler is washed in a solution and doubly rinsed between APEX ENVI ROTEC H each sampling event. STANDARD OPERATING PROCEDURES Upon recovery,a portion of the soil sample is sealed for later SOP-1 screening with either a portable PID,FID,or an SOIL BORING SAMPLING explosimeter. Another portion of the sample is used for description of the excavated materials. A third portion of the During drilling,soil samples for chemical analysis are sample is hermetically sealed,labeled and refrigerated for collected in thin-walled brass tubes,of varying diameters delivery,under strict chain-of-custody,to the analytical and lengths(e.g.,four or six inches long by two inches laboratory. These procedures minimize the potential for outside diameter). Three or four of the selected tubes,plus cross-contamination and volatilization of volatile organic a spacer tube,are set in an 18-inch long split-barrel sampler compounds prior to chemical analysis. of the appropriate inside-diameter. In the event the soil samples cannot be submitted to the Where possible,the split-barrel sampler is driven its entire analytical laboratory on the same day they are collected length either hydraulically or using a 140-pound drop (e.g.,due to weekends or holidays),the samples are hammer. The sampler is extracted from the borehole and temporarily stored until the first opportunity for submittal the brass tubes,containing the soil samples,are removed. either on ice in a cooler,such as when in the field,or in a Upon removal from the sampler,the selected brass tubes refrigerator at Apex's office. are either immediately trimmed and capped with aluminum foil or"Teflon"sheets and plastic caps or the samples are extruded from the tubes and sealed within other appropriate, SOP-3 cleaned sample containers. The samples are then SOIL CLASSIFICATION hermetically sealed, labeled,and refrigerated for delivery, under strict chain-of-custody,to the analytical laboratory. Soil samples are classified according to the Unified Soil These procedures minimize the potential for cross- Classification System. Representative portions of the contamination and volatilization of volatile organic samples may be submitted,under strict chain-of-custody,to compounds(VOC)prior to chemical analysis. an analytical laboratory for further examination and verification of the in-field classification and analysis of soil One soil sample collected at each sampling interval is mechanical and/or petrophysical properties. The soil types analyzed in the field using either a portable photo ionization are indicated on logs of either excavations or borings detector(PID),flame ionization detector(FID),organic vapor together with depths corresponding to the sampling points analyzer,catalytic gas detector,or an explosimeter. The and other pertinent information. purpose of this field analysis is to qualitatively determine the presence or absence of hydrocarbons,and the samples to be analyzed at the laboratory. The soil sample is sealed in SOP-4 either a brass tube,glass jar,or plastic bag to allow for some SAMPLE IDENTIFICATION AND CHAIN-OF-CUSTODY volatilization of VOC. The PID is then used to measure the PROCEDURES concentrations of hydrocarbons within the container's headspace. The data is recorded on both field notes and the Sample identification and chain-of-custody procedures boring logs at the depth corresponding to the sampling point. ensure sample integrity as well as document sample possession from the time of collection to ultimate disposal. Other soil samples are collected to document the soil and/or Each sample container submitted for analysis is labeled to stratigraphic profile beneath the project site,and estimate identify the job number,date,time of sample collection,a the relative permeability of the subsurface materials. All sample number unique to the sample,any in-field drilling and sampling equipment are either steam cleaned or measurements made,sampling methodology,name(s)of washed in solution and doubly rinsed in deionized water on-site personnel,and any other pertinent field observations prior to use at each site and between boreholes to minimize also recorded on the field excavation or boring log. the potential for cross-contamination. Chain-of-custody forms are used to record possession of the In the event the soil samples cannot be submitted to the sample from time of collection to arrival at the laboratory. analytical laboratory on the same day they are collected During shipment,the person with custody of the samples will (e.g.,due to weekends or holidays),the samples are relinquish them to the next person by signing the chain-of- temporarily stored until the first opportunity for submittal custody form(s)and noting the date and time. The sample- either on ice in a cooler,such as when in the field,or in a control officer at the laboratory will verify sample integrity, refrigerator at Apex's office. correct preservation,confirm collection in the proper SOP-2 container(s),and ensure adequate volume for analysis. SOIL EXCAVATION AND SAMPLING If these conditions are met,the samples will be assigned unique laboratory log numbers for identification throughout Excavation and subsequent soil sampling is performed analysis and reporting. The log numbers will be recorded on under the direction of a registered geologist or civil engineer. the chain-of-custody forms and in the legally-required log To reduce the potential for cross-contamination,all book maintained in the laboratory. The sample description, excavation equipment is either steam cleaned or washed date received,client's name,and any other relevant prior to use and between excavations. Soil samples for information will also be recorded. chemical analysis are collected in cleaned,thin-walled brass tubes of varying diameters and lengths(e.g.,six inches long by two inches outside diameter)or other appropriate cleaned sample container. If used,one tube may be set in a two inch inside diameter,hand-driven sampler. To reduce the potential for cross-contamination between samples,the