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August 11, 2000 -4 - 003-7170 sampling event was conducted in June 2000. Ground water samples from MW-2, MW-3 and MW4 were collected and analyzed in accordance with the WDRs for the following parameters: • Halogenated volatile organic compounds(HVOCs) • Total petroleum hydrocarbons as diesel (TPH-d) • Benzene, toluene, ethylbenzene and xylene(BTEX) • Methyl-tert butyl ether(MTBE) �. • Nitrates as NOS • Total Dissolved Solids .. • Standard Minerals • Specific conductivity • pH ` The results of the June 2000 sampling event are presented in the report prepared by Golder, titled "Second Quarter 2000 Monitoring Report, Owens-Brockway Glass Containers Facility, Tracy, California," dated August 11, 2000. Historical ground water level data is presented in Table 2. Historical water quality data associated with the supply well, process water ponds and ground water monitoring wells is presented in Tables 3 through 7. 2.0 HYDROGEOLOGIC SETTING 2.1 Regional Hydrogeologic Setting The site is located along the western edge of the San Joaquin Valley adjacent to the northern Diablo Range of the Coast Range geomorphic province. In the vicinity of the site, the Diablo Range is characterized by a series of interbedded marine sediments of cretaceous and tertiary age. The beds strike predominantly to the northwest and dip to the northeast. Alluvium and colluvium fill cover valleys and ridges in the region. The site is underlain by alluvial material derived from the adjacent Diablo Range. The Alluvium consists of fine grained sediments derived from the weathering and erosion of colluvium and bedrock. The facility is located within the San Joaquin Valley Floor Hydrogeologic Unit No. 543 as depicted on interagency hydrogeologic maps prepared by the Department of Water Resources in August of 1986 (RWQCB, 2000). Ground water reported in the Tracy-Dos Palos area has been divided into three water-bearing zones, the lower section, the upper section and a shallow zone. The lower section is .. bounded by consolidated deposits at the bottom of the section and an impermeable confining strata identified as the Corcoran Clay Member(Nolte, 1994). Two zones are reported to occur overlying the Corcoran Clay Member(Nolte, 1994). Regionally, in the vicinity of the site, ground water flow reportedly follows surface topography and flows towards the north (Nolte 1994). Nolte reported that shallow ground water in the vicinity of the site is generally not used for drinking or irrigation due to poor quality (Nolte 1994). .. ROO-37.doc Golder Associates