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FLUOR DANIEL GTI <br /> December 11, 1998 <br /> Mr. Bob DeNinno <br /> The Southland Corporation <br /> 10220 S.W. Greenburg Road, Suite 470 <br /> Portland OR 97223 <br /> Subject: Fourth Quarter 1998 Post-Remediation Monitoring and Sampling Report and Second <br /> Request for Closure <br /> i L Southland Store No.20304 <br /> 455 Grant Line Road <br /> Tracy,California <br /> Fluor Daniel GTI Project 102480 <br /> Dear Mr. DeNinno: <br /> This Fourth 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 October 15, 1998. Activities conducted during this reporting period are summarized <br /> below. <br /> ■L <br /> Depth to water(DTW)was gauged in 9 groundwater monitoring wells and two groundwater <br /> Lextraction wells (Figure 2). <br /> ■ Groundwater samples were collected from three wells: MWA, MW-5, and MW-16, and <br /> submitted to a certified laboratory for analysis for benzene,toluene, ethylbenzene and <br /> L xylenes (BTEX), methyl-tert-butyl-ether(MTBE),total petroleum hydrocarbons-as-gasoline <br /> (TPH-G), and the oxygenates. MTBE,tert-butanol (TBA), diisopropyl ether{DIPS), ethyl- <br /> tert-butyl ether(ETBE) and tert-amylmethyl ether(TAME). <br /> LClosure at this site is indicated based on post-remediation groundwater monitoring data which indicate <br /> hydrocarbon concentrations have declined by up to 97%in the former source area (removed in April 1998). <br /> The plume remains defined, and dissolved oxygen levels indicate continued on-going intrinsic <br /> Lbiodegradation. Also, MTBE has not been detected in any of the wells at the site. <br /> Groundwater Monitoring Data <br /> Groundwater monitoring was performed on October 15, 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 tap of the well casing using an ORS Environmental Equipment <br /> INTERFACE PROBE Well Monitoring system. <br /> 757 Arnold Drive, Suite D Martinez, CA 94553 USA (925) 370-3990 FAX (9251370-3991 <br /> ii <br /> %4 <br />