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L:_, 292«0 APEX ENVIROTECH INC . Upon removal from these„epl �app� lrgafQiy, tFte "ttpnr _ I six inches of each tube is cut qff and-c Aped -tq -pe , pote�tially STANDARD OPERATING PROCEDURES submitted for analysis . The t 1: c'ap�6 h`aihLkh foil or "Teflon" sheets and plastic caps or the samples are SOP-1 extruded from the tubes and sealed within other appropriate , HOLLOW STEM AUGER SOIL BORING SAMPLING cleaned sample containers . The samples are then hermetically sealed , labeled , and refrigerated for delivery, During drilling , soil samples for chemical analysis are under strict chain-of-custody, to the analytical laboratory, collected in thin-walled brass tubes , of varying diameters These procedures minimize the potential for cross- and lengths (e. g . , four or six inches long by two inches contamination and volatilization of volatile organic outside diameter) . Three or four of the selected tubes , plus compounds (VOC) prior to chemical analysis , a spacer tube , are set in an 18-inch long split-barrel sampler of the appropriate inside-diameter. The remaining portion of the plastic tube is cut open and a portion of the soil sample collected at each sampling interval Where possible , the split-barrel sampler is driven its entire is analyzed in the field using either a portable PID, FID , length either hydraulically or using a 140-pound drop organic vapor analyzer, catalytic gas detector, or an hammer. The sampler is extracted from the borehole and explosimeter. The purpose of this field analysis is to the brass tubes , containing the soil samples , are removed, qualitatively determine the presence or absence of Upon removal from the sampler, the selected brass tubes hydrocarbons , and the samples to be analyzed at the are either immediately trimmed and capped with aluminum laboratory. The soil sample is sealed in either a glass jar or foil or "Teflon" sheets and plastic caps or the samples are plastic bag to allow for some volatilization of VOC . The PID extruded from the tubes and sealed within other appropriate, is then used to measure the concentrations of hydrocarbons cleaned sample containers . The samples are then within the container's headspace. The data is recorded on hermetically sealed , labeled, and refrigerated for delivery, both field notes and the boring logs at the depth under strict chain-of-custody, to the analytical laboratory, corresponding to the sampling point. These procedures minimize the potential for cross- contamination and volatilization of volatile organic Other soil samples are collected to document the soil and/or compounds (VOC) prior to chemical analysis , stratigraphic profile beneath the project site, and estimate the relative permeability of the subsurface materials . All One soil sample collected at each sampling interval is drilling and sampling equipment are either steam cleaned or analyzed in the field using either a portable photo ionization washed in solution and doubly rinsed in deionized water detector (PID) , flame ionization detector (FID) , organic vapor prior to use at each site and between boreholes to minimize analyzer, catalytic gas detector, or an explosimeter. The the potential for cross-contamination, purpose of this field analysis is to qualitatively determine the presence or absence of hydrocarbons , and the samples to in the event the soil samples cannot be submitted to the be analyzed at the laboratory. The soil sample is sealed in analytical laboratory on the same day they are collected either a brass tube , glass jar, or plastic bag to allow for some (e .g . , due to weekends or holidays) , the samples are volatilization of VOC. The PID is then used to measure the temporarily stored until the first opportunity for submittal concentrations of hydrocarbons within the container's either on ice in a cooler, such as when in the field , or in a headspace . The data is recorded on both field notes and the refrigerator at Apex's office , boring logs at the depth corresponding to the sampling point. SOP-3 Other soil samples are collected to document the soil and/or SOIL EXCAVATION AND SAMPLING stratigraphic profile beneath the project site, and estimate the relative permeability of the subsurface materials . All Excavation and subsequent soil sampling is performed drilling and sampling equipment are either steam cleaned or under the direction of a registered geologist or civil engineer, washed in solution and doubly rinsed in deionized water To reduce the potential for cross-contamination , all prior to use at each site and between boreholes to minimize excavation equipment is either steam cleaned or washed the potential for cross-contamination, prior to use and between excavations . Soil samples for chemical analysis are collected in cleaned , thin-walled brass In the event the soil samples cannot be submitted to the tubes of varying diameters and lengths (e .g . , six inches long analytical laboratory on the same day they are collected by two inches outside diameter) or other appropriate cleaned (e . g . , due to weekends or holidays) , the samples are sample container, if used , one tube may be set in a two inch temporarily stored until the first opportunity for submittal inside diameter, hand-driven sampler. To reduce the either on ice in a cooler, such as when in the field , or in a potential for cross-contamination between samples , the refrigerator at Apex's office , sampler is washed in a solution and doubly rinsed between SOP-2 each sampling event. DIRECT PUSH SOIL BORING SAMPLING Upon recovery, a portion of the soil sample is sealed for later screening with either a portable PID , FID , or an During drilling , soil samples for chemical analysis are explosimeter. Another portion of the sample is used for collected in thin-walled plastic tubes , of varying diameters description of the excavated materials . A third portion of the and lengths (e.g . , two inches outer diameter by four feet sample is hermetically sealed , labeled and refrigerated for long) . The plastic sampling tube is placed inside a steel rod delivery, under strict chain-of-custody, to the analytical and driven into the subsurface to the desired depth using a laboratory . These procedures minimize the potential for direct push drill rig . The steel rod is then removed from the cross-contamination and volatilization of volatile organic subsurface and the plastic tube containing the soil sample compounds prior to chemical analysis , are removed from the steel rod . The process is repeated until the desired depth of the boring is reached . In the event the soil samples cannot be submitted to the analytical laboratory on the same day they are collected (e .g . , due to weekends or holidays) , the samples are