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CLEARWATER GROUP, INC. Groundwater Monitoring and Sampling Field Procedures procedures consist of scrubbing downhole w amps used). and rinsing in a first through any purging p Any non-dedicated down Prior to beginning,Alconox® solution swash r(wash solar ones pumped D contamination equipment in an rinse of potable water and a second rinse of Potable water or des°razed water f the latter is required hole equipment is decontaminated prior to use Clearwater s at the request of the project manager, and dor ng Ceasing wall d sampling a well, the static water levees measured to the nearest D O1 feet w►s� an electronic Water Prior to purging an p scall measured once Per y separate-phase sounder Depth to bottom is typ y tical data are not available, witty which to establish a reliable o first visit to a site If historical analytical en-ended product bailer, and the thickness His collected using a clear, op with an electronic in pr obe contamination, the water sounder and tape wiPll be decontaminated between each well If floating se hydrocarbons (SPH) are suspected or observed, alternatively luring measured and no a measurable thickness of SPH before or dunng purging is not additionally purged is measured to the nearest l}Ol feet in the bailer SPH mayproduct Any morutoring well containing Wells contaitung a hydrocarbon sheen are sampled unless otherwise specified by the sample is collected from that wall rlty as well as water level measurements and floating Q project manager Field observationspatu'e Calculations form thicknesses are noted on the Gauging physical parameters (pH +Nell using either a PVC bailer or asumersible Puues top assess if the water sample Each Monitanng well u iv sampled is purged water are monitored during purging en, turbidity, salinity etc e of le ss temperature and conductivity) of the purge aramealso ters such as dissolved Oxygen, the aquifer If rrg degrees collected is Samples representative ed representatives f p p separately from ammeter stability is achieved Stability is defined as a c an measured Same in a discreet sample decanted from the bailer of less than 10% change in conductivity d micro mhos, and less than 1 0 degree centigrade a ti rade (1 eg than 0 25 PH units, initially, an completely Fahrenheit) change to temperature Parameters are measure well comp Y the rest of the purge volumes have been removed or until stye ur a water Parameters are In at least four times haveuring Purging,ter fewer than three well volumes have one well volume Purging continues until three well casing be same parameters are dewaters Wells which dewater or demonstrate a slow recharge, may roved 55-gallon drums After being removed Well purging information 15 re�corded and stored onesite insD O T-app eters used to measure i been e water is sealed, lab a licensed waste hauler calibrated daily Purge I° nate disposal facility by chemically Profiled' the water is removed to an app op nate i ur to rate exceeds well recharge e rate, when stye well gMWd g slow, the well is allowed to recharge edwithin 24 Groundwater samples are collected immediately after purging ar, f p g g lin The well is same treme has recharged to at least 80% of its static water level If recharge hslene batters, either disposable or dedicated to the les are aced in well least two hours, if practicable, or until sufficient volume has accumulated for same g hours of purging or cepurged Samples are collected using poly Y form and placed on ice in a cooler for analyzed for compounds most sensitiive tedaonsaachain of custody form collected first surpass st standards do a cooler by Samples being r sit lied containers, labeled, d appropriate laboratory- PP tical laboratory Analytical detection limits moiety or transport to a state-certiftadanalytical relevant local or regional guidelines to the following procedures in the field To prevent contamination of the samples, CGI personnel adhere A new,clean pair of latex gloves are put on prior to sampling each well degree of Wells are gauged, pursed and groundwater Samples are collected in the expected order of increasing contamination based on historical analytical results the procedures previously All purging equipment will be thoroughly decontaminated between each well, using • described at the beginning of this section assing through the sampleSampCitrin nIs jzehe • to the volatiles from the uscusrover the l mouth of the bottle y The lid is carefully During sample collection for volatile organic analysis, the amount o air Q is removed This helps prevent the air from stnpp g resent within the bottle if a bubble on le Is pre bub, the sap are present sample down the side of the bottle until there is a convex m screwed onto the bottle such that no air b lbbles are tier After resealing the samp container and additional water is added to the same container a repeat inside,the sample container is discarded and the Procedure revised September 22. 1999 1 CLEARWN ER Gttotm,Isar- (GWS)