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PAGE - QUARTERLY MONITORING—REPQRT =- 6of61 QUARTER DATE Third Quarter 2005 19-Oct-2005 I reporting limits 524 MW-3 continues to remain free of contamination 525 TPH-diesel and TPH-motor oils in MW-4 remain below the reporting limits DCA12 and BTEX increased overall since last quarter while TPH-gasoline decreased TBA, EDB, DIPE, MTBE, ETBE, and TAME were below reporting limits 11 526 All groundwater samples secured by Doulos Environmental, Inc and were logged in a chain- of-custody form, placed in an ice chest and picked up by a California Department of Health Services (DHS)certified laboratory for analysis 53 Free Product 531 A September 1998 sample of groundwater monitoring well MW-2 found black,floating oil that appeared to be typical of used motor oil Floating oil has been removed from MW-2,using disposable bailers and absorbent socks, periodically since that time Approximately 20 1 gallons of floating oil have been removed(Table 3) 6.0 Discussion Dt 61 Conclusions 6 1 1 MW-4 ,Y • MW-4 was installed down gradient(at the time)from MW-2 to detect possible movement of used motor oil in the groundwater from the contamination source (former waste oil USTs at MW-2) No oil has been detected in the groundwater at MW-4, indicating that used oil contamination has not spread down gradient from MW-2 as far as MW-4 t x-90 • Groundwater from MW4 continued to show contamination from TPH-gasoline,1 , and BETX The TPH-gasoline contamination decreased again this quarter 4,The source of the gasoline contamination remains unknown at this time Figure 10 shows how the groundwater elevation affects the TPH-gasoline concentration As the groundwater elevations rise, the contamination levels also rise Not nor{zo r' � d rn • MW-4 has remained free from TPH-diesel contamination since second quarter 2002 6 12 Waste Oil USTs • The former waste oil USTs caused significant contamination of the soil and groundwater Immediately adjacent to the tanks Substantial quantities of oil have been removed from MW-2, however, contamination remains The used oil appears to move very slowly through the sod and In relatively close proximity to the former USTs location • Analysis of MW-2 continued to show contamination from TPH-diesel and TPH-motor ods Oxygenates appeared at an increased concentration than previous quarter while BETX decreased significantly MW-2 showed contamination from motor ods as reflected in the amount of floating oil removed during the past quarter and the analytical results The level of oil contamination has dropped continuously from 2001 MW-1, MW-3 and MW-4 continue to remain free of motor ods contamination, indicating that they have not been affected by contamination from the former used oil USTs r 6 13 Diesel USTs I • MW-1 (site of the former diesel USTs)continues to shoiontamination from diesel The TPH-diesel contamination level, as shown in Figurdropped below the reporting limit in June 2001, peeked at 72000 ppb in June 2002, reased through Sept 2003, increased In March 2004, slightly decreased in March 2004, increased through June THIS DOCUMENT AND CONTENTS ARE THE PROPERTY OF ENVIRONEERING, INC