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STANDARD OPERATING PROCEDURE- <br /> GROUNDWATER SAMPLING , <br /> , <br /> ,i ' ' r <br /> Gettler-Ryan Inc field personnel adhere to the following procedures for the collectionI and handling of <br /> groundwater samples prior to analysis by the analytical laboratory. Prior to sample collection, the type <br /> of analysis to be performed is determined Loss prevention of volatile compounds is controlled and <br /> sample preservation for subsequent analysis is'maintained r, <br /> Prior to sampling, the presence or absence of free-phase hydrocarbons is determined using an interface <br /> probe. Product thickness, if present, is measured to the nearest 0 01 foot and is noted in the field notes. <br /> In addition, static water level measurements are collected'with the interface probe and are also recorded <br /> in the field notes. <br /> After water levels are collected and priorto sampling, temperature„pH and electncal conductivity are <br /> measured If purging is to occur, each well is purged a ir'unimum of three well casmg'volumes of;water <br /> using pre-cleaned pumps (stack, suction,'Grundfos),rorpolyvinyl chloride bailers.,',The measurements, <br /> are taken a minimum of three times diinng,the purging F Purging=continues until these parameters <br /> stabilize <br /> v <br /> y .. .. L L. ^'C di <br /> L ..� t^ 3, W y r . i'J G...i-. .N...i, .....4 <br /> Groundwater sampfes are collected using disposable bailers The water samples are transferred from the <br /> bailer into appropnate'containers ,Pre-preserved'containers, supplied by analyticalolabomtones, are used <br /> when possible When pre-preserved containers are not available, the laboratory`is instructed to preserve <br /> the sample as appropriate Duplicate samples are collected for,the laboratory to use in maintaining W <br /> quality assurance/quality control_standards. The samples are labeled to include the lob number, sample <br /> identification,collection date and time, analysis,preservation (if any);and the sample,collector's iiutials. <br /> __ _-,---The=water samples=are=placed-inta-cooler;-maintainedrat4C=for=transport=to4the_laboratory.�Once¢--- <br /> collected <br /> —collected in the field, all samples are maintained under chain of custody until'delivered to the laboratory': <br /> �:..-.. =— —_-.-..-.--...— f--•--•--.-�. ��__.-,.-_ �-"..^r�-- sea =r�^.r....-s--.—:x=s-...,^�•-•>r—:=^..r..�-t.——_--•;Wc{s-;,�..;,s: _ ..w.F <br />