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APEX ENVIROTECH, INC. STANDARD OPERATING PROCEDURE Mcnitorinq Wells SOP SOP 4 - 1 SAMPLE IDENTIFICATION ANO CHAIN- SOIL 13OR1NG SAMPLING 'OF-CUSTODY PROOEDt.1RES Curing drilling, soil samples for chemical analysis are collected'. Sample identification and chain-0f-ustcdy procedures ensure in thin-vfalled brass tubes,of varying diameters and lengths sample irtegrty as v all as documard sample pcssessian from (e.g,.4 or 6 inches long by 2 inches outside diameter). Three the time of collection to ultimate disposal. Each sample E or four of the selected tubes,plus a spacer tube,are set in an container submitted for analysis is labeled to identify the jab 1 5-inch long split-barye[sampler of the appropriate inside- number,date,time of sample collection,a sample number diameter. unique tdthe sample,any in-Field measurements made, sampling methodology,name(s)of on-site personnel,and any Whore possible,the split-barrel sampler;s driven its entire other pertinent field observations also recorded on the field length either hydraulically or using a 140—pound drop hammer. excavation or baring log. The sampler is extracted from the borehoia and the brass tubes,containing the sail samples,are removed. Upon removal Chain-of-custody ferrns are used to record possession of the tram the sampler,the selected brass tubes are either sample from time of collection to arrival'at the laboratory, + immediately trimmed and capped ti.'h aluminum foil or"Teflon" During shipment,the person with custody of the samples vdll sheets and plastic caps or the samples are extruded from the relinquish them to the next person by signing the chain-of-tubes and sealed vAhin other appropriate,cleaned samp3e 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 af�ustody,to correct preservation,confirm collection in the proper the analytical laboratory. These procedures minimize the container(s),and ensure adequate volume for analysis. j potential for 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 Ing numbers far identification throughout i One soil sample collected at each sampling interval is analyzed analysis and reporting. The lag numbers will be retarded an in the field using either a portable photoianization detector the chain-0f-custody forms and in the legally-required log book f { (PID), (lame ionization detector,organic%apor analyzer, maintained in the laboratory. The sample description,data catalytic gas detector,or an explosimeter. 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 sail sample is sealed in either a brass tube, glass jar,or plastic bag to allow for soma volatilization of VOC, The P10 is then used to measure the concentrations of LABORATORY ANALYTICAL gUALITY hydrocarbons within the containers's headspace. The data is ASSURANCE AND CONTROL recorded on both field nates and the boring logs at the depth corresponding to the sampling point. In addition to routine instrument calibration•replicates,spikes, ? blanks,spiked blanks,and certified reference materials are A Other sail samples are collected to document the sail andlor routinely analyzed a:method-specific frequencies to monitor stratigraphic profile beneath the project sae,and estimate the. precision and bias. Add'ionaf components of the laboratory relative permeability of the subsurface materials. Alt drilling Quality Assurance/Quality Control program include: and sampling equipment are either steam cleaned or washed In solution and doubly rinsed in deionized water prior to use at 1. Participation in state and federal laboratory each site and between boreholes to minimize the potential for accredit atian/certification programs, crass-contamination. 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 later- analytical laboratory an 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 cooler,such as when in the field,or in a refrigeraior at Apes and periodic instrument maintenance; a ffic e. 4. 'Out-0f-Central"ICerrectiva Action documentation SOP procedures;and, - 3 SOIL CLASSIFICATION 5, blultii-levelreviewofraw data and client reports. I` Sail samples are classified according to the Unified Scli ` Classification System. Representeivu portions of the samples SOP _ G maybe submitted,under strict chain-af-custody,to an HOLLOW__—_,TF=rA AUGER I IONTTORINC; analyt;cal laboratory for further examinatian and verification of WELL INS-TAL"TION AND the In-field classification and analysis of sail mechanical andlor D1 VELOPiMEN-r petrophysical propartias. The sail types are indicated an logs il! of c1hcr excavations or borings together v,ith depths Boreholes for menaoring wells ara drilled using a truck- corresponding to the sampling poir:ts and other pertinent mourited,hol[ov, s em auger drill rig. The borehole diameter information. will be a minimum of 4 inches larger than the outside diameter Of the casing when 41stal[ing well scrmn. The hoilovv-stem i auger pravides minimal interruption of drilling while permitting {