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1 CLFARWATER GROUP Groundwater Monitoring and Sampling Field Procedures Groundwater Momigruig is established Decontamination procedures consist of scrubbing Prior to beginning, a decoatamrnation area downhole equipment in an Alconox(p solution wash(wash solution isum�off&detosized waterany m, and easing in a first Trow of potable water and a second rinse of potable ' requinA Any non-dedicated downhole equipment is decontaminated prior to use Prior to purging and sampling a well,the static water level is measured to the nearest 0 01 feet with an electronic to bottom is typically measured once Per Year, at the req of the probed manager', and water sounder � data are not available, with which#o establish a during Clearwatees first visit to a site If histoncal analytical between each reliable order of increasing well contamination, the water sounder and tape will or observed, decontaminatedbe SPH is collected rising a clear, well if floating Separate-&= hydrocarbons (SPH} are suspected ' open-ended product bailer, and the thickness is measured to the nearest 0 01 feet in the bailer SPH may alternatively be measured with an electronic interface probe Any monitoring well containing a merle is not additionally purged and no sample is colluded from that well thickness of SPH before or during purging led unless otbemim specdied by the pro3ed r Field ' Wells containing hydrocarbon sheen are camp product thicknesses are noted observations such as well integrity as well as water level measurements and floating p on the Gauging Data/Purge(tic ulatrons form- ' Wei either a PVC bailer or a submersible pump Physical Each monitoring well to be sampled is purged using parameters(pH,temperature and conductivity) of the purge water are monitored during purging activities to assess i esentative of the aquifer If required, param et is such as dissolved oxygen, t the ureter sample collected u rep tine parameter stability is achieved. turbidity, salinity etc. are also measured. Samples are considered representative P in micro mhos, Stability is defined as a change of less than 0.25 pH units, less than 109'0 rap virameters are measured in , and less than 10 degree centigrade(1 $degrees Fahrenheit)change in discreet sample decanted from the bailer separately from the nest of the Purge water Parameters ase measured at , and at volume intervals of one well volume Purging continues until least four furies during purging', initially, 1 dewaters Wells which dcwater or three well casing volumes have been removed or until the well completely ' demonstrate a slow recharge may be sampled after fewer than three well volumes have been removed- Well Data sheet. All meters used to measure parameters are calibrated purging information is recorded on the Purgerayed 55-gallon drums After being daily Purge water is sealed, labeled, and stored oe m D Of -approved a licensed waste hauler chemically profiled,the wager is removed to an appropriatedisposal ty ' Gro+mdwater Sample Collectionrate exceeds well recharge rate,when Groundwater samples are collected immediately after purging or, If purging recharge is extremely slow,the well is allowed to the well has recharged to at least 80%of its static water level If lumelin The well is ' recharge for at least two hours, if practicable, or until sufficlent volume liar accumulated for sampling ed Samples are collected using polyethylene bailers, either sampled within 24 hours of purging or regurg for compounds most sensitive to volatilization are disposable or dedicated to the Well Samples being analyzed documented on a collected first Water samples are placed in appropriate lfor transport lied containers, labeled, tiall ' chain of custody form and placed on ice in a cooler for transport to a state-certified analytical laboratory Analytical detection limits match or surpass standards requucd by relevant local or regional guidelines ' ,ally Assurance Procedures Procedures in the field To prevent contamination of the samples,Clearwater pemnnel adhere to the following p ' A new,clean parr of latex gloves rs put on prior to sampling each well • Wells are gauged,purged and groundwater samples are collected in the expected order of increasing degree of contanunation based on historical analytical results ' 1 Grevised April 4,2002 �twamR Gitoup(GWS)