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APEX ENVIROTECH, INC. STANDARD OPERA-nNG PROCEDURE Monitann Wells SOP _4 SOP - = SAMPLE loENTIFICATION AND CHAIN- SOIL BORING, SAMPLING OF-CUSTODY PROCEDURES Curing drilling soil samples far chemical analysis are collected Sample identification and chain-0f-custody procedures ensure in thin-walled brass tubes of varying diameters and lengths sample it tegrty as vA11 as document sample possession from (e g 4 or 8 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 for analysis is labeled to Identify the lob 18-inch long split barrel sampler of the appropriate Inside- number,date time of sample collection a sample number diameter unique to the sample any in-field measurements made, sampling methadolcgy name(s)of on-site personnel,and any Where possible the split barrel sampler is drreri is entire other pertinent field observations also recorded on the Field length either h}draulically or using a 1 40--paund drop hammer excavation or bonrg log The sampler is e)dracted tram the borehole and the brass tubes containing the sail samples,are removed Upon removal Chain of-custody forms are used to record possession of the from the sampler,the selected brass tubas are either sample from time of collection to arrival at the laboratory immediately trimmed and capped th aluminum fall or'Taflan" During shipment the person Vath custody of the samples veil sheets and plastic caps at the samples are extruded from the relinquish them to the ne)t person by signing the chain-of- tut-as and sealed within other appropriate cleaned sample custody farm(s)and noting the date and time The sample- containers The samples are then hermetically sealed,labeled control oFfcer at the laboratory will verify sample integrity, and refrigerated for delivery under strict chain-of-custody to correct preservation confirm collection in the proper the analytical laboratory These procedures minimize the eantainer(s),and ensure adequate valuma for analysis potential for cross-contamination and volatilization of wlatile organic compounds(VOC) prior to chemical analysis If these conditions are met the samples will be assigned unique laboratory log numbers far identification throughout One sod 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 photaianizatien detector the chain-of-custody forms and in the legally required log book (PID) flame ionization detector organic.apor analyzer, maintained in the laboratory The sample description,date catalytic gas detector or an explosimeter The purpose of this received clients name and any other relevant information will field analysis is to qualitatively determine the presence or also be retarded absence of hydrocarbons and the samples to be analyzed at the laboratory The sod sample is sealed in either a brass tube, glass jar,or plastic bag to allmv for some volatilization of VOC S O P - 5 The PID is then used to measure the concentrations of LASOFLATORY ANALYTICAL gUALITV hydrocarbons within the containers's headspace The data Is �S U RAN C E AND CONTROL recorded on both field notes and the boring logs at the depth corresponding to the sampling paint In addition to routine instrument calibration replicates spikes, blanks spiked blanks,and certified reference matenals are Other sail samples are collected to document the sail andlor routinely analyzed at method-specific frequencies to monitor stratigraphic profile beneath the project Ste and estimate the precision and bias Additional components of the laboratory relative permeabtty of the subsurface materials All drilling Quality Assurance/Quality Control program include aid sampling equipment are ether steam cleaned or washed In solution and doubly rinsed in deianized vrater prior to use at t Participation in state and federal laboratory each site and between boreholes to minimize the potential far accredtation/ceitifscation programs, cross-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 friter- analAcal laboratory on the same day they are collected(a g, laboratory performance evaluation programs, due to weekends or holidays),the samples are temporarily stared until the first opportunity far submittal ether on Ice In a 3 Standard operating procedures describing roubne cooler such as when in the field or in a refrigerator at Apes and pencdic Instrument maintenance, office 4 -Out-af-Cantral"!Corrective Action documentation SOP procedures,and, - 3 SOIL CLASSIFICATION S Mufti-level review of raw data and client reports Sail samples are classified according to the Unified Soil - Classification System Representative portions of the samples SOP - 8 may be submhed,under strict chain-of-custody,to an HOLLOWSTErVI AUGER MONITORING • analytical laboratory for further examination and verification of WELL INSTALLATION AND the in-field classification and analysis of sail mechanical and/or DEVELOPMENT petrophysical properties Tho sad types aro indicated on logs Of ether axcaYrations or borings together w,tth depths Barehales for moraonng walls are dnlled using a tmck- conresponding to the sampling pants and other pertinent mounted hollow-stem auger drill ng The borehole diameter Information Voil be a minimum of 4 inches larger than the outside drameter of tho casing Ntihan wistalling well screen The hallatiw-stain auger provides minimal interruption of dniling wtiile permitting