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GROUNDWATER MONITORING <br /> Groundwater Levels <br /> On July 13, 1994, Apex personnel collected groundwater-level measurements from all six wells <br /> All groundwater elevations were measured to the nearest 0 01 foot, referenced to the surveyed <br /> top-of-casmg elevations, and conducted according to the Apex standard operating procedures <br /> (SOP)included as Attachment I Liquid-level measurements collected smce January 1993 are <br /> summarized in Table 1 Figure 3 is a potentiometrnc surface map of the shallow water-bearmg <br /> zone on July 13, 1994 <br /> Groundwater Sampling and Analysis <br /> On July 13, 1994, Apex personnel collected groundwater samples from all six monitoring wells <br /> (MW-IB, MW-2 through MW-6) The samples were submitted, under sham-of-custody, to <br /> Sparger Technology, Inc , of Sacramento, California, a state-certified analytical laboratory All <br /> samples were collected according to the Apex SOP mcluded in Attachment 1 Analytical results <br /> since January ry1992 for total petroleum hydrocarbons (TPH)� as gasohne, and benzene toluene, <br /> ethylbenzene and total xylenes are summarized in Table 2 The laboratory analytical reports and <br /> chain-of-custody form are included m Attachment 2 <br /> REPORT DISTRIBUTION <br /> Apex submitted copies of this report, m final form, to <br /> 1 Ms E Thayer <br /> Central Valley Regional Water Control Board <br /> 3443 Routier Road, Suite'A' <br /> Sacramento, California 95827-3098 <br /> 2 Ms M Lagono <br /> San Joaquin County Environmental Health Division <br /> Post Office Box 2009 <br /> Stockton, California 95201 <br /> 2 <br />