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i <br /> i FLUOR DANIEL <br /> GT! <br /> it <br /> P4 11 <br /> April 10; 1998 <br /> Mr. Bob-DeNinno <br /> The Southland Corporation <br /> 555 S.Renton Village Place,Suite 700 <br /> Renton,°WA 98055 <br /> E <br /> j Subject:, First Quarter 1998 Monitoring and Sampling Report <br /> Southland Site No.20304 <br /> 455 Grant Line Road <br /> Tracy,California <br /> Fluor Daniel GTI Project 102480 <br /> Dear Mr: DeNinno: <br /> This First Quarter 1998 Monitoring and Sampling Report presents the results of monitoring and sampling <br /> activities�performed by Fluor Daniel GTI, Inc. (Fluor Daniel GTI)at the subject site(Figures 1 and 2, <br /> Attachment 1) on February 25, 1998. Activities conducted during this reporting period are summarized <br /> below. <br /> Depth to water D 4 <br /> p { TW)was gauged in 11 groundwater monitoring wells and three <br /> groundwater extraction wells(Figure 2). <br />' Groundwater samples were collected from five wells:MWA MW-5,MW-8,MW-9,and <br /> MWA 0. and submitted to a certified laboratory for analysis for benzene,toluene, <br /> I. I eth (benzene and xylenes(sTE�,total hydrocarbons-as asoiine(TPH-G) <br /> , � <br /> and the oxygenates, methyl-tert butyl-ether(MTBE),tert-butanol (TBA),diisopropyl ether <br /> (DIPS),ethyl-tert-butyl ether(ETBE),and tert-amylmethyl ether(TAME). <br /> i � € <br /> Groundwater Monitoring Data <br /> Groundwater monitoring was performed on February 25, 1998. Prior to monitoring,the well caps were <br /> opened to allow the water level in each well to stabilize to atmospheric pressure. The DTW was measured <br />' to the nearest 0.01 foot from the top of the well casing using an ORS Environmental Equipment <br /> INTERFACE PROBE Well Monitoring System. <br /> Se arate- Kase SP hydrocarbons were not detected in an of the monitoring wells. The water table <br /> P P O Y Y g <br /> elevations,calculated from the February 25, 1998 monitoring data,were used to prepare a potentiometric <br /> surface map(Figure 2). The groundwater flow is generally toward the north-northeast at a hydraulic <br /> radient'of 0.002 to 0.004 fttft. Groundwater monitoring results from the February 25 1998 monitoring and <br /> g g rY � 9 <br /> sampling event are presented in Table 1,and historical results are summarized in Table 1A(Attachment 2). <br /> Field data sheets are included in Attachment 3. j <br /> 757 Arnold Drive,Suite D / Martinez, CA 94553 USA (510) 370-3990 FAX (510) 370-3991 <br />