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r■ p TABLE 1 SUMMARY OF GROUNDWATER MONITORING AND ANALYTICAL RESULTS Gardner Property,Thornton,CA Page 7 of 7 (measured in feet MSL) (Reported in ug/1) Well IDJ Data Wellhead 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 <05 <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 <O 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 <05 <50 — — -- 09/18/97 NS NM NM <0 5 <05 e05 <05 <50 -- <MDLs 12/16/97 NS 16 90' NS <0 5 <0 5 <05 <2 <50 -- — - 03/20/98 NS 1151* 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 09/29/98 NS NM NS <0 50 <0 50 <0 50 <0 50 <50 -- -- -- 12/23/98 I NS NM NS -050 <0 50 -050 <0 50 -rW <25 — -- *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 6020 Ethylbenzene by EPA Method 6020 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 ethonolr t-butenol, MTBE, DIPE, ETRE, and TAME See Laboratory Data Sheets for MDLs Dissoved Oxygen by EPA Method 360 1 W 19/3261TABLEIATABLEQW 70.811!13!991