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combo Ranch Facility April 24,2005 Remedial Excavation&Source Removal MW-105 was located further down gradient to avoid shallow soil contamination. The ' boring was drilled through at least 7 feet of relatively dry clay into a course sand and gravel layer. A soil sample was collected every 10 feet for laboratory analysis. The 10 foot deep sample contained traces of gasoline and ethyl benzene. Soil samples collected at depths of 20, 30, and 40 feet were reported as non-detected for the compounds analyzed. ' A shallow well, MW-5, was added to the scope of work and located next to MW-105. Soil samples were not collected from this boring since it was situated within five feet of ' MW-105. Laborat ry Soil Sam le Results (May 5, 2004 Sample I.D. Gasoline Benzene Toluene E-Benzene Xylenes Oxy's M /K /K EB-4-10' 12 <25 <25 188 52 ND ' MW-4-10' 405 <625 <625 7000 17300 ND MW-4-15' <1.0 <5.0 <5.0 <5.0 <5.0 ND MW-105-10' 2.2 <25 <25 25 <25 ND MW-105-20' <1.0 <5.0 <5.0 <5.0 <5.0 ND MW-105-30' <1.0 <5.0 <5.0 <5.0 <5.0 ND MW-105-40' <1.0 <5.0 <5.0 <5.0 <5.0 ND On May 15, 2004 M.J. Kloberdanz & Associates, in conjunction with GeoAnalytical Laboratories, Inc., conducted quarterly groundwater monitoring of the Pombo Ranch site ' at 24100 S. Lammers Road in Tracy, California. Quarterly monitoring activities consisted of depth to water and water characterization measurements, well purging, groundwater sample collection and laboratory analysis of water samples collected from 1 the three groundwater-monitoring wells at this site. Traces of gasoline and gasoline constituents were detected in all of the wells with the ' exception of MW-3. The water sample collected from monitoring well MW-5 disclosed low concentration of MTBE. rLaboratory Water Sam le Results (May 14, 2004 Sample I.D. Gasoline Benzene Toluene E-Benzene Xylenes MTBE M /K g µ ' MW-1 0.05 1.0 4.7 0.8 4.3 <0.5 MW-2 0.05 0.8 3.5 0.6 3.1 <0.5 MW-3 <0.05 <0.3 <0.3 <0.3 <0.6 <0.5 ' MW-4 0.41 J. 1.1 <0.3 -- -12 14 1 20 - - MW-5 0.18 0.9 <0.3 6.5 0.5 1 <0.5 MW-105 0.14 3.8 16 3.1 16 <0.5 ' 5