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E QUARTERLY MONITORING REPORT 6 PAGE 5$ QUARTER DATE First Quarter 2006 26tiJun-2006 524 MW-3 continues to remain free of contamination 525 MW-4 found continued contamination from DCA12, DIPE, BTEX, and TPH-gasoline EDB made an appearance for the first time since June 2005 TBA, MTBE, ETBE,TAME,TPH- diesel and TPM-motor oils were below reporting limits i1 �``,,� 526 All groundwater samples` e"cured 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 5 3 1 A September 10-98- sample of groundwater monitoring well MW-2 found black, fl^afing 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 61 Conclusions 61 1 MW-4 • MW4 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 • • Groundwater from MW-4 showed contamination from DCA12, DIPE, EDB, BTEX,and TPH-gasoline The TPH-gasoline contamination increased this quarter 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 �—/Vp t 56 l 4>yt 4 ;yy_p�? • MW-4 has remained free from TPH-diesel contamination since s�: bnd uarter 2002 6 1 2 Waste Oil USTs '-114 \1 ftti'1> • 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 oils Oxygenates appeared at a decreased concentration than previous quarter while BETX increased MW-2 showed contamination from motor oils 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 MW4 continue to remain free of motor oils contamination, indicating that they have not been ww affected by contamination from the former used oil USTs m�} r p�� Wi S 4v'Wk� ' 3 6 1 3 Diesel USTs in--v" 2,001 & .fYlar41 • MW-1 (site of the former diesel USTs)continues to show contamination from diesel v The TP di el contamination level as shown in Figure 6, dropped below the reporting limit in JOY2001, peeked at 72000 ppb in,June 2002, decreased through Sept 2003, increased in March 2004, slightly decreased in March 2004, increased through June 2005, and now is decreasing r CONFIDENTIAL