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