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1 APEX ENVIROTECH, INC. ( �`x STANDARD OPERATING PROCEDURE i Monitoring Wells I SOP - 4 SOP z SAMPLE iDEN-ru=iCATION AND CHA1N- SOIL BORING SAMPLING OF-CUSTODY:PROCI=pURFS During drilling, sail samples for chemical analysis are collected Sample identification and chain-01-custody procedures ensure in thin-vralled brass tubes,of varying diameters and lengths sample irdegriy as vr:ll as document sample possession from (e.g..4 or 5 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 far analysis is labeled to identify the job 18-inch long split-barrel sampler or 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 lag. The sampler is extracted from the borehole and the brass tubes,containing the soil samples,are removed. Upon removal Chain-of-custody forms are used to record possession of the [ from the sampler,the selected brass tubes are either I p sample from time of collection to arrival at the laboratory, ' immediately trimmed and capped%-,,,h aiuminum foil or"Teflon" During shipment,the person vrith custody of the samples vrili sheets and plastic caps or the samples are extruded from the relinquish them to the ne)d 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-otcustody,to correct preservation,confirm collection in the proper the analytical laboratory. These procedures minimize the container(s),and ensure adequate volume for analysis. potential far cross-contamination and volatilization of volatile organic compounds(VOC)prior to chemical analysis. It these conditions are met,the samples will be assigned unique laboratory Icg 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 phctaiozization detector the chain-of-custody forms and in the legally-required log book (PID), flame ionization detector, �a or organic analyzer,9 A YL , maintained in the laboratory. The sample description,date catalytic gas detector,or an explasimeter. The purpose of this received,client's name.and any other relevant information will field analysis is to qualitatively determine the presence or also be recorded, absence of hydrocarbons,and the samples to be analyzed at the laboratory. The soil sample is sealed in either a brass tube, glass jar,or plastic bag to allow for some volatilization of VOC. SOP _ ,S The PID is then used to measure the concentrations of LASO RATOI3Y ANALYTICAL CIUAL17Y hydrocarbons within the containers's headspace. The data isSUR41,,1Cg AND CONTROL recorded on bath field notes and the boring logs at the depth f corresponding to the sampling point. In addition to routine instrument calibration,replicates,spikes, blanks,spiked blanks,and certified reference materials are Other soil samples are collected to document the soil and/or routinely analyzed at method-specific frequencies to monitor ' s{ratigraphic profile beneath the project s tee,and estimate the, precision and bias. Additional components of the laboratory relative permeability of the subsurface materials. All drilling Quality AssurarcelOuality Control program. include: r and sampling equipment'are either steam cleaned or washed In solution and doubly rinsed in deianized ureter prior to use at �, Participation in state and federal laboratory each site and between bareholes to minimize the potential for accred!<ationtcertificationm ra ra s. ' cross-contamination. P 9 2- Participation in both U.S.EPA Performance In the event the soil samples cannot be submitted to the Evaluation studies(WS and WP studies)and Inter- analytical laboratory on the same day they are collected(e.g., laboratory performance evaluation programs; due to weekends or holidays),the samples are temporarily stored until the first opportunity for submittal either on Ice In a 3. Standard operating procedures describing routine h cooler,such as when in the field,or in a refrigerator at Apex's and periodic instrument maintenance; office. 4, "Out-0f-Central"/Corrective Action documentation procedures-and, SOP - 3 SOIL C L/ S7 i=KATION S. Multi-level review of raw data and client reports. Sail samples are classified according to the Unified Sail ' Classification System, Representative portions of the samples 5015 _ 6 may besubmitted,understrictchain-0f-custody,toan HOLLOW-STEM AUGER MONITORING analytical laboratory for further examination and verification of WELL 1NSTA>_LATION AND the In-field classification and analysis of sail mechanical and/or DEV-ELO Pi'S ENT petrophysical properties. The soil"_ are indicated on logs of either excavations or borings together with depths Boreholes for monitoring walls aro drilled using a truck- corresponding to the sampling pcirts and other pertinent mounted,hollow-stem auger drill rig. The borehole diameter information. brill bs a minimum of 4 inches larger than the outside diameter of the casing when installing yeti screen. ,The hallaw stem i auger provides minimal interruption of drilling vvhilo permibing I