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APEX ENVIROTECH, INC. STANDARD OPERATING PROCEDURES Quarterly Monitoring Reports When practical,the groundwater sample should be collected d when the water level in the well recovers to at least 80 percent SOP - 4 of its static level. SAMPLE IDENTIFICATION AND CHAIN- OF-CUSTODY PROCEDURES The sampling equipment consists of either a"Teflon"bailer, PVC bailer,or stainless steel bladder pump with a"Teflon" bladder. If the sampling system is dedicated to the well,then Sample identification and chain-of-custody procedures ensure the bailer is usually"Teflon,"but the bladder pump is PVC with sample integrity as well as document sample possession from a polypropylene bladder. In general and depending on the the time of collection to ultimate disposal. Each sample intended laboratory analysis,40-milliliter glass,volatile organic container submitted for analysis is labeled to identify the job analysis(VOA)vials,with"Teflon"septa,are used as sample number,date,time of sample collection,a sample number containers. unique to the sample,any in-field measurements made, sampling methodology,name(s)of on-site personnel,and any SOP - 12 other pertinent field observations also recorded on the field MEASURING LIQUID LEVELS USING excavation or boring log. WATER LEVEL METER OR INTERFACE PROBE Chain-of-custody forms are used to record possession of the sample from time of collection to arrival at the laboratory. Field equipment used for liquid-level gauging typically includes During shipment,the person with custody of the samples will the measuring instrument(water-level meter or interface probe) relinquish them to the next person by signing the chain-of- and product bailer(s). The field kit also includes cleaning custody form(s)and noting the date and time. The sample- supplies(buckets,solution,spray bottles,and deionized water) control officer at the laboratory will verify sample integrity, to be used in cleaning the equipment between wells. correct preservation,confirm collection in the proper container(s),and ensure adequate volume for analysis. Prior to measurement,the instrument tip is lowered into the well until it touches bottom. Using the previously established top-of- If these conditions are met,the samples will be assigned casing or top-of-box(i.e.,wellhead vault)point,the probe cord unique laboratory log numbers for identification throughout (or halyard)is marked and a measuring tape(graduated in analysis and reporting. The log numbers will be recorded on hundredths of a foot)is used to determine the distance the chain-of-custody forms and in the legally-required log book between the probe end and the marking on the cord. This maintained in the laboratory..The sample description,date measurement is then recorded on the liquid-level data sheet as received,client's name,and any other relevant information will the"Measured Total Depth"of the well. also be recorded. When necessary in using the interface probe to measure liquid levels,the probe is first electrically grounded to either the metal SOP - 5 stove pipe or another metal object nearby. When no ground is LABORATORY ANALYTICAL QUALITY available,reproducible measurements can be obtained by ASSURANCE AND CONTROL clipping the ground lead to the handle of the interface probe case. In addition to routine instrument calibration,replicates,spikes, The probe tip is then lowered into the well and submerged in blanks,spiked blanks,and certified reference materials are the groundwater. An oscillating(beeping)tone indicates the routinely analyzed at method-specific frequencies to monitor probe is in water. The probe is slowly raised until either the precision and bias. Additional components of the laboratory oscillating tone ceases or becomes a steadytone. In either Quality Assurance/Quality Control program include: case,this is the depth-to-water(DTW)indication and the DTW 1. Participation in state and federal laboratory measurement is made accordingly. The steady tone indicates accreditation/certification programs; floating liquid hydrocarbons(FLH). In this case,the probe is slowly raised until the steady tone ceases. This is the depth-to- 2. Participation in both U.S.EPA Performance product(DTP)indication and the DTP measurement is made Evaluation studies(WS and WP studies)and inter- accordingly. laboratory performance evaluation programs; The process of lowering and raising the probe must be 3. Standard operating procedures describing routine repeated several times to ensure accurate measurements. The and periodic instrument maintenance; DTW and DTP measurements are recorded on the liquid-level data sheet. When FLH are indicated by the probe's response, 4. "Out-of-Control"/Corrective Action documentation a product bailer is lowered partially through the FLH-water procedures;and, interface to confirm the FLH on the water surface and as further indication of the FLH thickness,particularly in cases 5. Mufti-level review of raw data and client reports. where the FLH layer is quite thin. This measurement is recorded on the data sheet as"FLH thickness" SOP - 7 GROUNDWATER PURGING AND In order to avoid cross-contamination of wells during the liquid- SAMPLING level measurement process,wells are measured in the order of "clean"to"dirty'(where such information is available). In Prior to water sampling,each well is purged by evacuating a addition,all measurement equipment is cleaned with solution minimum of three wetted well-casing volumes of groundwater. and thoroughly rinsed with deionized water before use,between When required, purging will continue until either the discharge measurements in respective wells,and at the completion of the water temperature,conductivity,or pH stabilize,a maximum of days use. ten wetted-casing volumes of groundwater have been recovered or the well is bailed dr.