ETHER    ETHER   2BUTENE  METHAC-  CARBON
                                       TERT-    TERT-   TRANS-1  RYLATE    DI-
                                       BUTYL   PENTYL    4-DI-   ETHYL-  SULFIDE
                                       ETHYL   METHYL   CHLORO    WATER   WATER
                                      UNFLTRD  UNFLTRD  UNFLTRD  UNFLTRD  WHOLE
SITE NUMBER STATION   NUMBER  DATE    RECOVER  RECOVER  RECOVER  RECOVER  TOTAL
                                      (UG/L)   (UG/L)   (UG/L)   (UG/L)   (UG/L)
                                      (50004)  (50005)  (73547)  (73570) (77041)

     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  <.108    <.224    <1.38    <.556   <.160
     5       252414080333200 11-17-97  <.108    <.224    <1.38    <.556   <.160
     5       252414080333200 11-18-97  <.108    <.224    <1.38    <.556   <.160
     5       252414080333200 11-19-97  <.108    <.224    <1.38    <.556   <.160
     5       252414080333200 11-20-97  <.108    <.224    <1.38    <.556   <.160
     6       252421080333201 11-17-97  <.054    <.112    <.692    <.278   <.080
     7       252424080333801 11-16-97  <.054    <.112    <.692    <.278   <.080
     8       252428080312700 11-18-97   --       --       --       --       --
     9       252428080312801 11-14-97  <.216    <.448    <2.77    <1.11   <.320
     10      252505080302501 1-28-98   <.054    <.112    <.692    <.278   <.080
     11      252523080352500 11-17-97   --       --       --       --       --
     12      252557080333700 11-19-97   --       --       --       --       --
     13      252624080302901 1-28-98   <.054    <.112    <.692    <.278   <.080
     14      252651080323001 11-13-97  <.054    <.112    <.692    <.278   <.080
     15      252700080333500 11-19-97   --       --       --       --       --
     15      252700080333500 11-20-97  <.108    <.224    <1.38    <.556   <.160
     16      252716080290601 1-27-98   <.054    <.112    <.692    <.278   <.080
     17      252740080334901 11-16-97  <.054    <.112    <.692    <.278   <.080
     18      252742080334301 11-18-97  <.054    <.112    <.692    <.278   <.080
     19      252842080290501 1-27-98   <.054    <.112    <.692    <.278   <.080
     20      252845080334500 11-14-97  <.108    <.224    <1.38    <.556   <.160
     20      252845080334500 11-17-97  <.108    <.224    <1.38    <.556   <.160
     20      252845080334500 11-18-97  <.108    <.224    <1.38    <.556   <.160
     20      252845080334500 11-19-97  <.108    <.224    <1.38    <.556   <.160
     20      252845080334500 11-20-97  <.108    <.224    <1.38    <.556   <.160
     21      252850080331801 11-17-97  <.054    <.112    <.692    <.278   <.080
     22      252851080323300 11-19-97   --       --       --       --       --
     22      252851080323300 11-20-97  <.108    <.224    <1.38    <.556   <.160
     23      252940080261204 1-29-98   <.054    <.112    <.692    <.278   <.080
     24      252951080251201 1-29-98   <.054    <.112    <.692    <.278   <.080