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TABLE 1 SUMMARY OF GROUNDWATER MONITORING AND ANALYTICAL RESULTS Gardner Property,Thornton,CA Page 7 of 7 � (measured in feet MSL) (Reported in ug/I) Well ID Date Wellhea Depth to G W Benzene Toluene Ethyl Xylenes TPHg MTBE Fuel Dissoved Elev Water Elev Benzene (EPA 8020) Oxygenates Oxygen Muni 10/29/91 NS NM NM <0 30 <0 30 <0 30 <0 30 <30 -- --Well 12/03/92 NS NM NM <0 5 <0 5 <0 5 <0 5 <50 -- — -- 03/29/96 NS NM NM <0 5 <0 5 <0 5 <0 5 <50 — -- 06/28/96 NS NM NM <0 5 <0 5 <0 5 <0 5 <50 10/04/96 NS NM NM <0 50 <0 50 <0 50 <0 50 <50 12/17/96 NS NM NM <0 5 <0 5 <0 5 <0 5 <50 03/25/97 NS NM NM <0 50 <0 50 <0 50 <0 50 <50 -- -- 06/25/97 NS NM NM <0 5 <0 5 <0 5 <0 5 <50 — -- -- 09/18/97 NS NM NM <0 5 <0 5 <0 5 <0 5 <50 -- <MDLs -- 12/16/97 NS 16 90* NS <0 5 <0 5 <0 5 <2 <50 -- 03/20/98 NS 11 51* NS <0 5 <0 5 <0 5 <2 <50 <5 <MDLs -- 06/30/98 NS 21 92* NS <0 50 <0 50 <0 50 <0 50 <50 -- <MDLs -- 09/29/98 NS NM NS <0 50 <0 50 <0 50 <0 50 <50 — 12/23/98 NS NM NS <0 50 <0 50 <0 50 <0 50 <50 <2 5 -- -- 04/05/99 NS NM NS i <0 50 <0 50 <0 50 r <0 50 <50 <5 0 Notes ft MSL = feet, Mean Sea Level, assuming ground surface datum is 10 feet above MSL(USGS 7 5 minute Thornton Quadrangle) ug/l = micrograms per liter or parts per billion < = not detected at or above Stated Method Detection Limit(MDL) -- = not sampled/not analyzed TPHg = Total Petroleum Hydrocarbons as gasoline, analyzed by EPA Method 5030/8015 Benzene by EPA Method 8020 Toluene by EPA Method 8020 Ethylbenzene by EPA Method 8020 Total Xylenes by EPA Method 8020 Methy-t-butyl ether(MTBE)by EPA Method 8020 NM = Not Monitored NS = Not Surveyed * = measurement collected from top of sounding tube Fuel Oxygenates by EPA Method 8260 includes ethonol, t-butanol, MTBE, DIPE, ETBE, and TAME See Laboratory Data Sheets for MDLs Dissoved Oxygen by EPA Method 360 1 W Z258ZTABLE51TatAegw 18!251991