P-ISO-   DI-
                                                      PROPYL-  BROMO-  BROMO-
                                                      TOLUENE METHANE   DI-
                                              CHLORO-  WATER   WATER  CHLORO-
                                      TOLUENE   FORM   WHOLE   WHOLE  METHANE
 SITE NUMBER STATION   NUMBER   DATE   TOTAL   TOTAL    REC   RECOVER  TOTAL
                                       (UG/L)  (UG/L)  (UG/L)  (UG/L)  (UG/L)
                                      (34010) (32106) (77356) (30217) (32101)

      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 <.076   E.130   <.220   <.100   <.096
      5       252414080333200 11-17-97 <.076   E.120   <.220   <.100   <.096
      5       252414080333200 11-18-97 <.076   E.060   <.220   <.100   <.096
      5       252414080333200 11-19-97 <.076   E.059   <.220   <.100   <.096
      5       252414080333200 11-20-97 <.076   E.055   <.220   <.100   <.096
      6       252421080333201 11-17-97 <.038   E.070   <.110   <.050   <.048
      7       252424080333801 11-16-97 <.038   <.052   <.110   <.050   <.048
      8       252428080312700 11-18-97   --      --      --      --      --
      9       252428080312801 11-14-97 E.024   <.208   <.440   <.200   <.192
     10       252505080302501 1-28-98  <.038   E.009   <.110   <.050   E.053
     11       252523080352500 11-17-97   --      --      --      --      --
     12       252557080333700 11-19-97   --      --      --      --      --
     13       252624080302901 1-28-98  <.038   E.012   <.110   <.050   <.048
     14       252651080323001 11-13-97 <.038   <.052   <.110   <.050   <.048
     15       252700080333500 11-19-97   --      --      --      --      --
     15       252700080333500 11-20-97 <.076   <.104   <.220   <.100   <.096
     16       252716080290601 1-27-98  <.038    1.12   <.110   <.050   E.011
     17       252740080334901 11-16-97 <.038   <.052   <.110   <.050   <.048
     18       252742080334301 11-18-97 <.038   <.052   <.110   <.050   <.048
     19       252842080290501 1-27-98  <.038   0.378   <.110   <.050   E.011
     20       252845080334500 11-14-97 E.018   E.061   <.220   <.100   <.096
     20       252845080334500 11-17-97 <.076   E.033   <.220   <.100   <.096
     20       252845080334500 11-18-97 <.076   E.024   <.220   <.100   <.096
     20       252845080334500 11-19-97 <.076   E.025   <.220   <.100   <.096
     20       252845080334500 11-20-97 <.076   <.104   <.220   <.100   <.096
     21       252850080331801 11-17-97 <.038   <.052   <.110   <.050   <.048
     22       252851080323300 11-19-97   --      --      --      --      --
     22       252851080323300 11-20-97 <.076   E.030   <.220   <.100   <.096
     23       252940080261204 1-29-98  <.038   0.515   <.110   <.050   0.143
     24       252951080251201 1-29-98  <.038   0.714   <.110   E.049   0.337