METHYL  TETRA-   TRI-
                                              METHYL-   ENE   CHLORO- CHLORO-
                                      METHYL-  CHLO-   CHLO-   ETHYL- FLUORO-
                                      BROMIDE   RIDE    RIDE    ENE   METHANE
 SITE NUMBER STATION   NUMBER   DATE   TOTAL   TOTAL   TOTAL   TOTAL   TOTAL
                                       (UG/L)  (UG/L)  (UG/L)  (UG/L)  (UG/L)
                                      (34413) (34418) (34423) (34475) (34488)

      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 <.296   <.508   <.764   <.076   <.184
      5       252414080333200 11-17-97 <.296   <.508   <.764   <.076   <.184
      5       252414080333200 11-18-97 <.296   <.508   <.764   <.076   <.184
      5       252414080333200 11-19-97 <.296   <.508   <.764   <.076   <.184
      5       252414080333200 11-20-97 <.296   <.508   <.764   <.076   <.184
      6       252421080333201 11-17-97 <.148   <.254   <.382   <.038   <.092
      7       252424080333801 11-16-97 <.148   <.254   <.382   <.038   <.092
      8       252428080312700 11-18-97   --      --      --      --      --
      9       252428080312801 11-14-97 <.592   <1.02    4.09   <.152   <.368
     10       252505080302501 1-28-98  <.148   <.254   <.382   <.038   <.092
     11       252523080352500 11-17-97   --      --      --      --      --
     12       252557080333700 11-19-97   --      --      --      --      --
     13       252624080302901 1-28-98  <.148   <.254   <.382   E.006   <.092
     14       252651080323001 11-13-97 <.148   <.254   <.382   <.038   <.092
     15       252700080333500 11-19-97   --      --      --      --      --
     15       252700080333500 11-20-97 <.296   <.508   <.764   <.076   <.184
     16       252716080290601 1-27-98  <.148   <.254   <.382   E.012   <.092
     17       252740080334901 11-16-97 <.148   <.254   <.382   <.038   <.092
     18       252742080334301 11-18-97 <.148   E.010   <.382   <.038   <.092
     19       252842080290501 1-27-98  <.148   <.254   <.382   E.004   <.092
     20       252845080334500 11-14-97 <.296   <.508    1.55   <.076   <.184
     20       252845080334500 11-17-97 <.296   <.508   <.764   <.076   <.184
     20       252845080334500 11-18-97 <.296   <.508   <.764   <.076   <.184
     20       252845080334500 11-19-97 <.296   <.508   <.764   <.076   <.184
     20       252845080334500 11-20-97 <.296   <.508   <.764   <.076   <.184
     21       252850080331801 11-17-97 <.148   <.254   <.382   <.038   <.092
     22       252851080323300 11-19-97   --      --      --      --      --
     22       252851080323300 11-20-97 <.296   <.508   <.764   <.076   <.184
     23       252940080261204 1-29-98  <.148   <.254   <.382   E.006   <.092
     24       252951080251201 1-29-98  <.148   <.254   <.382   E.050   <.092