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CLEA RWATER GROUP Groundwater INC Monitoring and Sarnpi„ng Field Procedures "nor to r beginning, a decontamination equipment in an Alcon ox® area is established hole ofpotable water and a S condn wash {wash solution is DeCpntamination procedures equipment is decontaminated rinse ofpotable w Pumped through an consist of ecru prior to use ater or delonized water if the latter Iss coins scrubbing downhole Prior to Purging P usedl and sounder g and samPling a well, required rinsing in a first Any nondedicated down first �pih to bottom is t the static water visit to a site ypically measured level 1s measured to t conte If historical Once per year, at the re he nearest 0 ruination the waters analytical data a quest of the O1 feet with an electronic w hydrocarbons (SPH) sounder and to re not available, Project mans is measured t 1 are suspected wrl2 be deconta wltli which to establish a ger, and dung water o the p cted or observed SPH 1s rnrnated reliable order of tncreas nwaters Any monitorin nearest Q OS feet to the Collected between each g weIi containing hailer using a clear, well If floating sample is ar, open-ended g separate well collected from th t g a measurable tlticknSepHof may a ternatively be Product bailer, Phase Protect manager a well Wells before or measured with and the thickness thicknesses Field observations s containing a h duan an electranle interface sees are noted on the G uch as well ince ydracarban sheen g purging 1s not additionalI Probe Gauging Dar Integrity as w are sampled unless otherwise s purged and no 'urge Calculations form well as water level r r measurements peclfied by the Each monitorin and floating product temperature g ++vel] to be sampled is collected r and conductivity) of the Purged ter ePresentatly Pure g either a PVC bailer or measured e °f the aquifer I water are monitored a submersible than 0 25 Samples are considered re If required during PurgingPump Physical PN units, less than l Presentative if parameters such activities to parameters (pH, Fahrenheit 0%o changeparameter stabilityas dissolved oxygen, turbidity, if the water sample the rest of the in temperature In Conductivity 1s achieved Y. sallnit one w he purge water p Parameters are iii y iA micro mhos, Stability is defined Y etc are also ell volume Parameters are easured in a discreet Sample s than l as a change of less de�vaters Purging continues measured at Ieast four times p decanted from Centigrade Fells which Jcwater or anal three well cash Burin m the bailer se (I t degrees been removed Well demonstrate a g volumes h g Purging initlalI separately calibrated purging info slow rechar have been r Y, and at vola Y from daily Aur rmatlon is recorde ge° may lee salts removed or until t me intervals of chemically profiled, ge water is sealed, Is eco d on the Pure pled after, fewer than he well completely the water is and stored g Data sheet All meters used to three well Volo removed to an aPPro on site in D p ince have r w prate disposal T-approved 55-gallon Parameters are Groundwater Posa1 facility by a licensed gallon drums samples are collected Waste hauler tris After being has recharged to immediatel least two hours, 1f ]east SO% of Its static w y after purging or, if hours of Practicable. water level If recharge Purging rate e Purging or re °r until sufficient vola ge is ex xceeds well Samples bele Purged Samples are collected me has accumulated d foeML r slow, thew recharge rate, when the well aPPro date labaanalyzed for co pounds using polyethylene sampling The well ]IoWed to recharge for at transport to a Statery supplied ontamels, labeled, to volaillztian bailers, either disposable or 1S sampled within 24 relevant local citified analytical 1 documented are collected dedicated to the Or regional aborat°ry Anal on a chain of c first Water sam l well guidelines ytiCal detection custody form and Sample, are placed in limits match Placed on ice in a cooler for Or surpass standards required b TO prevent contaminatian Of the samples, y CGI personnel a A new, clean required to the followln pair,of latex gloves g Procedlir ` Fells are are Put an prior es in the field to salnpltng each well contamination purged and groundwater nation based on historical samples analytical result,p es are collected in the All purging equipment expected described e Pment will order of increasing bed at the be be thoroughly decontaminated degree of ginning of this s between section each well During sample collection for , assn This helps volatile gI the Procedures previously P pireheent 'he air from PPin rghe C anal sample Bow side of stri g the v analysis the amount screwed onto the the bottle olatiles frons the of air passing throe battle such that until there is a co water Sample bottles 8h the sample is and additional water is no air bubbles are eYek meniscus are filled b minimized inside the Sam added to the s Present within the ver the mouth of the battle y slowly running the triple Container 1 ample container battle If a b The !id r s �scarded After resealing the bubble is present carefully and the procedure is re sample container, if the cap is removed repeated with a but, still are 1 new container a present CLEAkwArER GROUP,INC f {GWS) I revised August 3, 200©