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• CLEARWATER GROUP Grnundtivater Alntirtoring and Sampling�e1d Pr Groundwaterommitarin oeeclures Prior to beginning downhole a g' a deCOntammunation irisin quipinen#mini an area is established g in a first Alconoxg3 solution wash w Decont An no rinse nhotable water ( ash solation is nVed tion procedures consist Y 10"-dedicated downhole a and a second equipment is deconta rinse afpotable pumped through any Puxging p of scrubbing Prior to mmmInated water or de1omm1zed water if APs used gauging prior to use ),and pFessure toe ' Purgumg, and the latter is required equalize if local sal ►Iing a well, caps for all on yv measured to the nearest 0(l1 'r eater I5 Year, at under confined or se ells should be the request of the an electronic u ater sounder nn card opened to allow not available Project rrsana er, ixied eondttlons T atmospheric wilt be ' with which to establish g 'and during Clearwater`s first eeto Yo °S°e Is The static water level is deepl which between a reliable order of typical meas�ed once per observed will be collected usui each Well nmCreasin 1f histancal anal Ol leek in g a clear, o Floating g well contamination, ytical data are the bailer gPH pen_endcd g Separate-phase hydrocarbons the Fater sa cantainmg a measurable thiinackness aItelziativel product bailer, and the t (SPH) under grid tape collected from Y be measured iv,th an electronic hickness is ) where suspected or that well Wells contaf SPH before or loin aneasured to manager Field obse ming h droc g purging is not in probe An nearest ri'ations of we21 lite Y arbors sheen are sa additionally Purged Y omtormg well Data/purge Calculations form itY water level inpied, unless oand and floating product otherwise specified b o sample is Well Pur in thicknesses are noted on Y the project Each monitorin the Gauging (PH, tem g well to be sampled is purged using sample collected is representative of the 8 either a PVC bailer or etc are also Presentative of the purge Water are mmmonitored during submersible pip ph as a change measured Samlales are co aquifer If re g Purging Physical g of less than 0 25 required, g g activities to assess if the water pH units, less Pif par ters such as dissolved ax centigrade Considered repre (1 $degrees Fa lion I0/chars amm1eter stabili Ygen turbidity, from the bailer seg hrenhert)chan change In conductive rY Is achieved h', salinity Purging Initially, Parately from change m terriperaire Parameters are xn micro mhos Stability IS defied Y and at the rest of the , and less volumes have been re purging vol Purge Fater Para measured iii a discreet s than I 0 degree recharge moved ore intervals of one meters are measured at Ieast four t ge rate uimtil casin ainPIe decanted recorded on the py be samPled after fewer thanll completely dew tern pinging continues �s duan Wastes wge Data sheet three well vol atexs Wells that dewater or de three well casing stored on site n D O e is All meters used to mimes have been r nmmmstrate a water)is handled In one of three wasure paraineters are removed Well slow appropriate dis almProved 55. calibrated dailypurging information is trans he Ci facility 2) Pur gallon drums After bei 1)Purge and rm5eate Investigation derived ported to the Chea Purge and ru seate g chermvcall water rs sealed, labeled then transferred to S$ rwater cqu'Pnient `Fater is collected into Y prof then the , and water is collected in agallon drums yard in Point Richmond a 250- at" Is rerrmoved to an 250- pending disposal at an appropriate CA At the gallon portable holding applicable methal will be indicated iPnortable holden ppropriate dispoaldfactlthe lnvesti anon tank and g tank and g derived waste Is the field log sheets and transported to thea ty' or ) Purge and rinseate Groundwater Sa time correspondin PProgriate disposal facility g technical report The Groundwater sa Ie Collection exce 117PIes are collected Immediately els well recharge rate Y after If recharge is extremel 'samples are collected when purging, with volurlie for sa y slow, the well is allowed to has the followin mripling has accumulated has rec g exception I f the Purging collected umriulated recharge far at re harged to at least$p%n of its static water using Polyeth leve The well is s least two hours grate Compounds most se Y bailers, either dis amPled within 24 hours of ' if practicable level misitlel to volatilization Posable ar dedicated pur In ' or until sufficient supplied containers, labeled are collected first g g or Is re or Sala transport to astate-certified a do, Water sam the well San bean Ples are relevant Iocai or re nalytical laboratory a chain of costal Ples are placed in g analyzed for regional guidelines r' Analytical let form and placed on ice PproPmiate laboratory_ mics match or surpascooler for s standardn a sequ red by CLEAxWA7sa GROUP(GWS) l revised September 9, 200)5