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k <br /> TABLE 1 <br /> SUMMARY OF GROUNDWATER MONITORING AND ANALYTICAL RESULTS <br /> Gardner Property,Thornton,CA <br /> Page 7 of 7 <br /> (measured in feet MSL) lRe orted In ug/0 <br /> Well ID Date Wellhead Depth to G W Benzene Toluene Ethyl Xylenes TPHg MTBE Fuel <br /> Elev Water Elev Benzene (EPA 8020) Oxygenates <br /> 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 <05 <0 5 <0 5 <50 — — <br /> 03/29/96 NS NM NM <0 5 <0 5 <0 5 <0 5 <50 — -- <br /> 06/28/96 NS NM NM <0 5 <0 5 <0 5 <0 5 <50 — -- <br /> 10/04/96 NS NM NM <0 50 <0 50 <0 50 <0 50 <50 — <br /> 12/17196 NS NM NM <0 5 <0 5 <0 5 <0 5 <50 -- -- <br /> 03/25197 NS NM NM <0 50 <0 50 <0 50 <0 50 <50 — -- <br /> 06/25/97 NS NM NM <0 5 <0 5 <0 5 <0 5 <50 -- — <br /> 09/18/97 NS NM NM <0 5 <0 5 <0 5 <0 5 <50 -- <MDLs <br /> 12/16197 NS 16 90' NS <0 5 <0 5 <0 5 <2 <50 -- -- <br /> 03120198 NS 11 51' NS <05 <0 5 <0 5 <2 <50 <5 <MDLs <br /> 06/30198 1 NS 2192' NS <0 50 <0 50 <0 50 <0 50 <50 — ` <MDLs <br /> I <br /> Notes <br /> ft MSL = feet, Mean Sea Level,assuming ground surface datum is 10 feet above MSL(USGS 7 5 minute Thornton Quadrangle) <br /> ug/l = micrograms per liter or parts per billion <br /> < = not detected at or above Stated Method Detection Limit (MDL) <br /> -- = not sampled/not analyzed <br /> TPHg = Total Petroleum Hydrocarbons as gasoline, analyzed by EPA Method 5030/8015 <br /> Benzene by EPA Method 8020 <br /> Toluene by EPA Method 8020 <br /> Ethylbenzene by EPA Method 8020 <br /> Total Xylenes by EPA Method 8020 <br /> Methy-t-butyl ether(MTBE) by EPA Method 8020 <br /> NM = Not Monitored <br /> NS = Not Surveyed <br /> = measurement collected from top of sounding tube <br /> Fuel Oxygenates by EPA Method 8260 Includes ethonol, t-butanol, MTBE, DIPE, ETBE, and TAME See Laboratory Data Sheets for MDLs <br /> w <br /> W W43MTABLMTABLWW AS 101201091 <br />