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{ Ir <br /> i <br /> P IMM <br /> FIELD PROCEDURES <br /> Me,surement of the De th to jrouaLWLater i,• Mtonitorin Wells <br /> The depth of the ground-water surface in a monitoring well is measured from the top of the <br /> well casing to the nearest 0.41 foot with a Solinst water-level indicator. <br /> &hieclive Analysis ofroun�r <br /> he ir-fluid interface in a <br /> Groundwater samples are collected forsubjective <br /> length of a cl ananalysis frotaTeflon bailer through <br /> half <br /> monitoring well by lowering approximately <br /> the interface. The bailer is retrieved and the water sample is visually examined for floating <br /> product, sheen, and other subjective evidence of hydrocarbons. <br /> Pur in and Sam lin of Monitorin Wells <br /> rged from each <br /> Before sample collection,a minimum of 4 welt volume sufficof ground nt volume Pwater is purged to allow <br /> monitoring well using an electric submersible pump- e water <br /> temperature.pH, and conductivity o ge 80e pur ercent of then tialllevel,After ground wateresample l is <br /> well is allowed to recover to at 1 p is retrieved <br /> collected by lowering a clean Teflon bailer ah air-water 40-mill liter glass vials rthat contain <br /> and the sample is slowly transferred to laboratory-cleaned, <br /> concentrated hydrochloric acid as a preservative. The vials are completely filled so as to <br /> fi <br /> the date and <br /> prevent headspace. The vials aresery t ve used e labeled with land the he site dsample identifcat onentification �number. The <br /> time of sample collection, the pr <br /> samples are promptly placed in iced storage and delivered to a laboratory certified by the <br /> State of California. <br /> ArvPiied lGeosotems <br />