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n , The exact survey Well Surveying of casing to the nearest�Q D l foot l ed at the north side of t h b°uneven, the point of contact between casing and roe ect All well elevations f th�rvey rod or, if the casing 10 ill of its' later disturbance relattiu cto o rine Elevations i u are refete e either to mean sea levelor or a point(at the centeri1e the poi clearly marked and mamminedion ally choseiigso as to mnnii) surveyed by a licensed land surveyor, datum A pro)"t datumil tylected Where required,tone wells are file hydrants are comm y mean sea tevel Groundwater Sampling bbing Decontamination PrpGedures consist oumcmused) { o tri blished ed through arty purging p p I ° d`� or a decontamination area is esta wash soluttou IS pump Prior to beg mg' an nt}conox® solution wash( otable water or deion►zed water if the latter i downhole equipment tri potable water and a second rinse of p nor to use and rinsing tint a first rinse of p hole equipment is decontam mated p required Any not down ro ect manager, and ater level is measured to thereeuest o 0the p t 1 nth an electronic a lin a well, the static w per ear, at the q with which to establish Prior to purging and same g scally measured once p y Depth to bottom is typ tical data are not available, a clear, open' water sounder P the water sounder and tape will be decontaminated between eac during wren contarninatton, SPH rs collected usinalternatively be Clearwater's fins isit to a stte If historicalare suspected or observed°the bailer SPH may 11 before reliable order of Increasing hydrocarbons(SPH) well If floating p ,xell containing a measurable thie ells ontaining a ct bailer, and the thickness i be me Any rnioni oruig est 0 containing d from that well11 ended produ le is c Ih as we n with an electronic interface probe ed grid no ramp the pro)ect manager Field observation sI)ata)Purgo or during purging is not additionally p g led unless otherwise specified by easurements grid floating product thicknesses are noted os>,the aug hydrocarbon sheen are camp integrity as well as water level in Calculations form physical e 1 P r well to be sampled is purged using enther a PWC bailer oras, p rr ing activities to assess if onitarung of the purge water are monitored diuirig p is achieved back m nature and conductivity) infer if required parameters such as dissolved oxygen parameters(pH,temPe ammeter stability resentative of the aq m micro mhos, the water sample collected is rep e in conductivity les are cosisideessdthanrl0%tchang salinity etc are also measured Sa Op 5 pH units, e in temperature Parameters are measured in a turbidity, a of less than chang water parameters are measured at least Stability is defined as a change ade(l 8 degreeS Fahrenheit) and less than 10 degree centighe bailer rep arately front the rest of the Purge uS continues until three Well discreet sample decanted from and at volume intervals of one We11 volume Pigg m infotmation 1s vn ,initially, well completely dewaters yrell edcWellpurgogdemrtria to a four times dumg P g g ved or until the purge water is sealed, casing volumes have been remo eters are calibrated daily roflled, the water ns led after fewer than three well volumes have been rnay be same After being cherrrically p slow recharge- e Data sheet All meters used to allonidamn, recorded on the Purg O T_approved 55-g }abeled, and stored on site tri Dal facility by a licensed waste hauler T bp,ledd to ain appropriate disp e rate,when the e C le ti or, if purging rate exceeds well recharge arg well is allowed to Gr u dw ter a ediately after pg'ng if recliarg e is extremely slaw, the The well ss Groundwater samples are collected Of s reelrarged to at least 80% of its static water level llected using poly ethylene bailersareeither colldected Hirst has racticable, or until sufficieiita volume has accumulated font�p u' lu well Samples are c recharge far at least two hours, ging or repurged chain of custod} sampled within 24 hours of purging being analyzed for compounds most sensitive to to ry i inalytical detection linins dedicated to the well S P o nate laboratory-supplied of ed Ral}jtfcbi labeled, ory ented on a or les are placed in apps P Water and ple In a aced regional guidelines mast rc and placed otandards required by relevant 106al or match or surpass s i reg iced fuoi� 2�) 2001 3 - .. ,,r`1171, � �_