CIS-1,2
                                      ACETATE   -DI-  2-HEXA-            O-
                                       VINYL  CHLORO-   NONE           XYLENE
                                       WATER   ETHENE  WATER           WATER
                                      UNFLTRD  WATER   WHOLE  STYRENE  WHOLE
 SITE NUMBER STATION   NUMBER   DATE  RECOVER  TOTAL   TOTAL   TOTAL   TOTAL
                                       (UG/L)  (UG/L)  (UG/L)  (UG/L)  (UG/L)
                                      (77057) (77093) (77103) (77128) (77135)

      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   <1.49   <.084   <.128
      5       252414080333200 11-17-97   --    <.076   <1.49   <.084   <.128
      5       252414080333200 11-18-97   --    <.076   <1.49   <.084   <.128
      5       252414080333200 11-19-97   --    <.076   <1.49   <.084   <.128
      5       252414080333200 11-20-97   --    <.076   <1.49   <.084   <.128
      6       252421080333201 11-17-97   --    <.038   <.746   <.042   <.064
      7       252424080333801 11-16-97   --    <.038   <.746   <.042   <.064
      8       252428080312700 11-18-97   --      --      --      --      --
      9       252428080312801 11-14-97   --    <.152   <2.98   <.168   <.256
     10       252505080302501 1-28-98    --    <.038   <.746   <.042   <.064
     11       252523080352500 11-17-97   --      --      --      --      --
     12       252557080333700 11-19-97   --      --      --      --      --
     13       252624080302901 1-28-98    --    <.038   <.746   <.042   <.064
     14       252651080323001 11-13-97   --    <.038   <.746   <.042   <.064
     15       252700080333500 11-19-97   --      --      --      --      --
     15       252700080333500 11-20-97   --    <.076   <1.49   <.084   <.128
     16       252716080290601 1-27-98    --    <.038   <.746   <.042   <.064
     17       252740080334901 11-16-97   --    <.038   <.746   <.042   <.064
     18       252742080334301 11-18-97   --    <.038   <.746   <.042   <.064
     19       252842080290501 1-27-98    --    <.038   <.746   <.042   <.064
     20       252845080334500 11-14-97   --    <.076   <1.49   <.084   <.128
     20       252845080334500 11-17-97   --    <.076   <1.49   <.084   <.128
     20       252845080334500 11-18-97   --    <.076   <1.49   <.084   <.128
     20       252845080334500 11-19-97   --    <.076   <1.49   <.084   <.128
     20       252845080334500 11-20-97   --    <.076   <1.49   <.084   <.128
     21       252850080331801 11-17-97   --    <.038   <.746   <.042   <.064
     22       252851080323300 11-19-97   --      --      --      --      --
     22       252851080323300 11-20-97   --    <.076   <1.49   <.084   <.128
     23       252940080261204 1-29-98    --    <.038   <.746   <.042   <.064
     24       252951080251201 1-29-98    --    <.038   <.746   <.042   <.064