ARCHIVED REPORTS_SOIL AND GROUNDWATER INVESTIGATION REPORT 2006

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Geomatrix TABLE 6 SUMMARY OF GROUNDWATER SAMPLE ANALYTICAL RESULTS FOR VOLATILE ORGANIC COMPOUNDSI TAOC Tracy Gravel Pits Tracy, California Concentrations in micrograms per liter ( µg/L) 4- Methyl- 15151 ,2- 1919292- 2-penta- Tetra- Tetra- Tetra- 11213 - 1 ,2,4 - 19191 - 1 , 1 ,2- Trichloro- Trichloro- 1 ,2 ,4- 193 , 5- Sample Sample none Naph - n- Propyl- chloro- chloro- chloro- Trichloro- Trichloro- Trichloro- Trichloro- Trichloro- fluoro- trifluoro- Trimethyl Trimethyl Vinyl Vinyl Xylenes, Name Date (MIBK) thalene benzene Styrene ethane ethane ethene Toluene benzene benzene ethane ethane ethene methane ethane benzene benzene Acetate Chloride Total GMX-24-082205 08/22/05 <50 < 1 . 0 < 1 . 0 <0 . 50 <0 . 50 <0 . 50 <0 . 50 <0 . 50 < 1 . 0 GMX-25 -082305 08/23 /05 <50 < 1 . 0 < 1 . 0 <0 . 50 <0 . 50 <0 . 50 <0 . 50 <0 . 50 < 1 . 0 < 1 . 0 <0 . 50 <0 . 50 <0 . 50 - - - - GMX-26 -082505 08/25/05 <50 < L0 < 1 . 0 <0 . 50 <0 . 50 <0 . 50 <0 . 50 <0 . 50 < 1 . 0 < 1 . 0 <0 . 50 <0 . 50 <0 . 50 < 1 . 0 <0. 50 <0 . 50 <0 . 50 <25 <0 . 50 < 1 . 0 GMX-27-082405 08/24/05 <50 < 1 . 0 < 1 . 0 <0 . 50 <0 . 50 <0 . 50 <0 . 50 <0. 50 < 1 . 0 < 1 . 0 <0 . 50 <0 . 50 <0 . 50 GMX-28-082205 08/22/05 <50 < 1 . 0 < 1 . 0 <0 . 50 <0 . 50 <0 . 50 <0 . 50 <0 . 50 < 1 . 0 < 1 . 0 <0 . 50 <0. 50 <0 . 50 < L0 <0 . 50 <0 . 50 <U0 <25 <0 . 50 < 1 . 0 Notes : 1 . Groundwater samples collected by Geomatrix Consultants, Inc . , and analyzed by Severn Trent Laboratories (STL San Francisco) , . nc . , of Pleasanton , California for volatile organic compounds using EPA Method 8260B . 2 . < - Analyte was not detected at or above the laboratory reporting limit indicated . 1 :\Doc_Safe\7000s\7066.001 \Reports\2005 Soil Investigation and Well Survey\2 Tables\Summary Tables Gravel Pits-Tables 1 -7 Page 3 of 3