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APEX ENVIROTECH, INC, STANDARD OPERATING PROCEDURES rl--- terly Monitoring Reports SOP - 4 recovered or the well Is bailed dry When practical,the SAMPLE IDENTIFICATION AND CHAIN- groundwater sample should be collected when the water level OF-CUSTODY PROCEDURES in the well recovers to at least 80 percent of its static level The sampling equipment consists of either a"Teflon"bailer Sample identification and chain-af-custody procedures ensure PVC bailer,or stainless steel bladder pump with a'Teflon' sample integrity as well as document sample possession from bladder If the sampling system is dedicated to the well then the time of collection to ultimate disposal Each sample the bailer is usually"Teflon"but the bladder pump is PVC with container submitted for analysis is labeled to identify the lob a polypropylene bladder In general and depending on the number,date,time of sample collection a sample number intended laboratory analysis,4D-mdldter glass volatile organic unique to the sample,any in-field measurements made analysis(VOA)vials,with'Teflon"septa are used as sample sampling methodology,name(s)of on-site personnel and any containers other pertinent field observations also recorded on the field excavation or bonng log SOP - 1 2 MEASURING LIQUID LEVELS USING Cham-of-custody forms are used to record possession of WATER LEVEL METER OR INTERFACE thesample from time of collection to arrival at the laboratory PROBE During shipment,the person w'th custody of the samples will relinquish them to the next person by signing the chain-of- Field equipment used for liquid-level gauging typically includes custody form(s)and noting the date and time The sample- the measuring instrument(water-level meter or interface probe) control officer at the laboratory will verify sample integrity, and product bailer(s) The field let also includes cleaning correct preservation,confirm collection in the proper supplies(buckets,solution,spray bottles and deionized water) container(s),and ensure adequate volume for analysis to be used in cleaning the equipment between wells If these conditions are met the samples will be assigned Prior to measurement,the instrument tip is lowered into the well unique laboratory log numbers for identification throughout until t touches bottom Using the previously established top-of- analysis and reporting The log numbers will be recorded on casing or top-of-box(i a wellhead vault)point the probe cord the chain-of-custody forms and in the legally-required log gook (or halyard)is marked and a measuring tape(graduated in maintained in the laboratory The sample description,date hundredths of a foot)is used to determine the distance received client's name,and any other relevant information will between the probe and and the marking on the cord This also be recorded measurement is then recorded on the liquid-level data sheet as the"Measured Total Depth"of the well SOP - 5 When necessary in using the interface probe to measure liquid LABORATORY ANALYTICAL QUALITY levels the probe is first electrically grounded to ether the metal ASSURANCE AND CONTROL stove pipe or another metal object nearby When no ground is available reproducible measurements can be obtained by In addition to routine instrument calibration,replicates spikes clipping the ground lead to the handle of the interface probe blanks,spiked blanks and certified reference materials are case routinely analyzed at method-specific frequencies to monitor The probe tip is then lowered into the well and submerged in precision and bias Acidtional components of the laboratory the groundwater An oscillating(beeping)tone indicates the Quality Assurance/Quality Control program include probe is in water The probe is slowly raised until ether the 1 Participation in state and federal laboratory oscillating tone ceases or becomes a steady tone In ether accreditation/certification programs, case this is the depth-to-water(DTW)indication and the DTW measurement is made accordingly The steadytone indicates 2 Participation in both U S EPA Performance floating liquid hydrocarbons(FLH) In this case the probe is Evaluation studies(WS and WP studies)and inter- slowly raised until the steady tone ceases This is the depth-to- laboratory performance evaluation programs product(DTP)indication and the DTP measurement is made accordingly 3 Standard operating procedures describing routine and panodic instrument maintenance, The process of lowering and raising the probe must be repeated several times to ensure accurate measurements The 4 "Out-0f-Control"/Corrednre Action documentation DTW and DTP measurements are recorded on the liquid-level procedures,and, data sheet When FLH are indicated by the probe's response a product bailer is lowered partially through the FLH-water 5 Mufti-level rewew of raw data and client reports interface to confirm the FLH on the water surface and as further indication of the FLH thickness particularly in cases SOP - 7 where the FLH layer is quite thin This measurement is GROUNDWATER PURGING AND recorded on the data sheet as"FLH thickness" SAMPLING In order to avoid cross-contamination of wells during the liquid- Prior to water sampling,each well is purged by evacuating a level measurement process wells are measured in the order of minimum of three wetted well-casing volumes of groundwater "clean"to"dirty'(where such information is available) In When required,purging will continue until ether the addition,all measurement equipment is cleaned with solution dischargethree wetted well-casing volumes of groundwater and thoroughly rinsed with deionized water before use between When required,purging will continue until ether the discharge measurements in respective wells,and at the completion of the water temperature,conductivity,or pH stabilize a mawmum of days use ten wetted-casing volumes of groundwater have been