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TABLE 1 SUMMARY OF GROUNDWATER MONITORING AND ANALYTICAL RESULTS Gardner Property,Thornton,CA Page 7 of 7 (mesa ured in feat MSL) (Re orted in u /I) Well ID Date Wellhead Depth to G W Benzene Toluene Ethyl Xylenes TPHg MTBE Fuel Dfasoved Elev Water Elev Benzene (EPA 8020) Oxygenates Oxygen_ Munn 10129191 NS NM NM <0 30 <0 30 <0 30 <0 30 <30 — — -` Well 12!03(92 NS NM NMI <0 5 <0 5 <0 5 <0 5 <50 -- — 03/29/96 NS NM NM <05 <05 <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 <05 <0 5 <50 — — '- 03/25/97 NS NM NM <0 50 <0 50 <0 50 <0 50 <50 — -- - 06/25197 NS NM NM <0 5 <05 <0 5 <0 5 <50 — -- — 09/18/97 NS NM NM <0 5 <05 <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 2192* NS <0 50 <0 50 <0 50 <0 50 <50 — <MDLs -- 09/29l88 I NS NM I N5 10 50 1 <0 50 -050 1 <0 50 <50 -- — — • Notes ft MSL = feet, Mean Sea Level, assuming ground surface datum is 10 feet above MSL (USGS 7 5 minute Thornton Quadrangle) ug/I = 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, DIPS, ETRE, and TAME See Laboratory Data Sheets far MDLs Dissoved Oxygen by EPA Method 360 1 W 5.MAV1,MTA0LE13W xL6112111 M81