METHANE           BENZENE  BENZENE
                                     TOLUENE   BROMO   BENZENE    SEC     TERT-
                                     P-CHLOR  CHLORO-  N-BUTYL  BUTYL-   BUTYL-
                                      WATER     WAT     WATER    WATER    WATER
                                     UNFLTRD  UNFLTRD  UNFLTRD  UNFLTRD  UNFLTRD
SITE NUMBER STATION   NUMBER  DATE     REC      REC      REC      REC      REC
                                      (UG/L)  (UG/L)   (UG/L)   (UG/L)   (UG/L)
                                     (77277)  (77297)  (77342)  (77350)  (77353)

     1          02290769     11-21-97   --      --       --       --       --
     2       252100080340000 11-20-97   --      --       --       --       --
     3       252144080313800 11-19-97   --      --       --       --       --
     4       252213080313100 11-21-97   --      --       --       --       --
     5       252414080333200 11-16-97 <.112    <.088    <.372    <.096    <.192
     5       252414080333200 11-17-97 <.112    <.088    <.372    <.096    <.192
     5       252414080333200 11-18-97 <.112    <.088    <.372    <.096    <.192
     5       252414080333200 11-19-97 <.112    <.088    <.372    <.096    <.192
     5       252414080333200 11-20-97 <.112    <.088    <.372    <.096    <.192
     6       252421080333201 11-17-97 <.056    <.044    <.186    <.048    <.096
     7       252424080333801 11-16-97 <.056    <.044    <.186    <.048    <.096
     8       252428080312700 11-18-97   --      --       --       --       --
     9       252428080312801 11-14-97 <.224    <.176    <.744    <.192    <.384
     10      252505080302501 1-28-98  <.056    <.044    <.186    <.048    <.096
     11      252523080352500 11-17-97   --      --       --       --       --
     12      252557080333700 11-19-97   --      --       --       --       --
     13      252624080302901 1-28-98  <.056    <.044    <.186    <.048    <.096
     14      252651080323001 11-13-97 <.056    <.044    <.186    <.048    <.096
     15      252700080333500 11-19-97   --      --       --       --       --
     15      252700080333500 11-20-97 <.112    <.088    <.372    <.096    <.192
     16      252716080290601 1-27-98  <.056    <.044    <.186    <.048    <.096
     17      252740080334901 11-16-97 <.056    <.044    <.186    <.048    <.096
     18      252742080334301 11-18-97 <.056    <.044    <.186    <.048    <.096
     19      252842080290501 1-27-98  <.056    <.044    <.186    <.048    <.096
     20      252845080334500 11-14-97 <.112    <.088    <.372    <.096    <.192
     20      252845080334500 11-17-97 <.112    <.088    <.372    <.096    <.192
     20      252845080334500 11-18-97 <.112    <.088    <.372    <.096    <.192
     20      252845080334500 11-19-97 <.112    <.088    <.372    <.096    <.192
     20      252845080334500 11-20-97 <.112    <.088    <.372    <.096    <.192
     21      252850080331801 11-17-97 <.056    <.044    <.186    <.048    <.096
     22      252851080323300 11-19-97   --      --       --       --       --
     22      252851080323300 11-20-97 <.112    <.088    <.372    <.096    <.192
     23      252940080261204 1-29-98  <.056    <.044    <.186    <.048    <.096
     24      252951080251201 1-29-98  <.056    E.020    <.186    <.048    <.096