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I <br /> GROUNDWATER MONITORING <br /> Groundwater Levels <br /> On October 18, 1994, Apex personnel collected groundwater-level measurements from all six <br /> wells All groundwater elevations were measured to the nearest 0 01 foot, referenced to the <br /> surveyed top-of-casing elevations, and conducted according to the Apex standard operating <br /> procedures(SOP) included as Attachment 1 Liquid-level measurements collected since January <br /> 1993 are summarized in Table 1 Figure 3 is a potentiometnc surface map of the shallow water- <br /> bearing zone on October 18, 1994 <br /> Groundwater Sampling and Analysis <br /> On October 18, 1994, Apex personnel collected groundwater samples from all six monitoring <br /> wells(MW-1B, MW-2 through MW-6) The samples were submitted, under cham-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 included in Attachment 1 Analytical results <br /> since January 1992 for total petroleum hydrocarbons(TPH), as gasoline, 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 in Attachment 2 <br /> . REPORT DLSTMUTION <br /> Apex submitted copies of this report, in final form, to <br /> 1 Ms E Thayer <br /> Central Valley Regional Water Control Board <br /> 3443 Routier Road, Surte'M <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 />