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i` <br /> ' r, GROUNDWATER MONITORING <br /> 1. <br /> Groundwater Levels <br /> On April 11, 1995, 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-casing elevations and conducted according to the Apex standard operating procedures <br /> C, (SOP)included as Attachment 1. Liquid-level measurements collected since January 1993 are <br /> summarized in Table 1. Figure 3 is a potentiometric surface map of the shallow water-bearing <br /> zone on April 11, 1995. No floating liquid hydrocarbons(FLH)were observed to be present in <br /> any of the wells. <br /> Groundwater Sampling and Analysis <br /> On April 11, and May 2, 1995, Apex personnel collected groundwater samples from the six wells. <br /> The wells were sampled on April 11, 1995, for total petroleum hydrocarbons (TPH), as gasoline <br /> and benzene, toluene, ethylbenzene and total xylenes(BTEX). The wells were sampled on May <br /> 2, 1995, for total petroleum hydrocarbons(TPH), as diesel, during the start up of the remediation <br /> system All samples were collected according to the Apex SOP included in Attachment 1. The <br /> samples were submitted, under chain-of-custody, to Sparger Technology of Sacramento, <br /> California, a state-certified analytical laboratory. Analytical results since January 1992 for(TPH), <br /> as gasoline and diesel, and(BTEX) are summarized in Table 2. The laboratory analytical reports <br /> and chain-of-custody form are included in Attachment 3. <br /> � r <br /> L <br /> i <br /> L <br /> 2 <br />