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. h f :1 :I ,... 'f 114GROUNDWATER MONITORING t Groundwater Levels ` j� On January 14, 1994, Apex personnel collected groundwater-level measurements from all six I wells. All groundwater elevations were measured to the nearest 0.01 foot, referenced to the surveyed top-of-casing elevations and conducted according to the Apex standard operating procedures(SOP)included as Attachment 1. Liquid-level measurements collected since January f E' 1993 are summarized in Table 1. Figure 3 is a groundwater elevation hydrograph based on the data in Table 1. Figure 4 is a potentiometric surface map of the shallow water-bearing zone on January 14, 1994. Despite previous occurrences of floating liquid hydrocarbons(FLH) in MW-1, no FLH were observed to be present in any of the wells. Groundwater Sampling and Analvsis On January 14, 1994, Apex personnel collected groundwater samples from the six wells. All t samples were collected according to the Apex SOP included in Attachment 1. The samples were submitted, under chain-of-custody, to Pace Incorporated of Novato, California, a state-certified analytical laboratory. Analytical results since January 1992 for total petroleum hydrocarbons E (TPH), as gasoline and diesel, and benzene, toluene, ethylbenzene and total xylenes are summarized in Table 2. The laboratory analytical reports and chain-of-custody form are included in Attachment 2. Figure 5 is a distribution map of TPH, as gasoline and diesel, and benzene in ' ,A groundwater on January 14, 1994. k `! REPORT DISTRIBUTION Apex recommends copies of this report be submitted, in final form, to: 1. Mr. B. Newman �I Central Valley Regional Water Control Board 3443 Routier Road, Suite 'A' j Sacramento, California 95827-3098 2. Ms. M. Lagorio 4 i� San Joaquin County Environmental Health Division Post Office Box 2009 Stockton, California 95201 r f t 2 {