METHYL-    TETRA-       TRI-
                                                               METHYL-      ENE      CHLORO-    CHLORO-
                                                   METHYL-      CHLO-      CHLO-     ETHYL-     FLUORO-
                                                   BROMIDE      RIDE       RIDE        ENE      METHANE
   WELL 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           252505080302501     1/28/98     <.148       <.254      <.382      <.038      <.092
        2           252624080302901     1/28/98     <.148       <.254      <.382      E.006      <.092
        3           252716080290601     1/27/98     <.148       <.254      <.382      E.012      <.092
        4           252842080290501     1/27/98     <.148       <.254      <.382      E.004      <.092
        5           252940080261204     1/29/98     <.148       <.254      <.382      E.006      <.092
        6           252951080251201     1/29/98     <.148       <.254      <.382      E.050      <.092
        7           254131080234401     2/11/98     <.148       <.254      <.382      E.022      <.092
        8           254156080214601     2/10/98     <.592       <1.02      <1.53      <.152      <.368
        9           254201080281701     2/11/98     <.592       <1.02      <1.53      <.152      <.368
       10           254207080202201     2/10/98     <.148       E.015      <.382      <.038      <.092
       11           254938080170902      2/9/98     <.592       <1.02      <1.53      <.152      <.368
       12           254958080171601     2/12/98     <.592       <1.02      <1.53      <.152      <.368
       13           255052080245001     3/18/98     <.592       <1.02      <1.53      <.152      <.368
       14           260053080144701     2/12/98     <.592       <1.02      <1.53      <.152      <.368
       15           260223080143301     3/16/98     <.592       <1.02      <1.53      <.152      <.368
       16           260234080211701     1/26/98     <.148       <.254      <.382      <.038      <.092
       17           260322080162103     3/17/98     <.592       <1.02      <1.53      <.152      <.368
       18           260332080182101     3/17/98     <.592       <1.02      <1.53      <.152      <.368
       19           260539080155101     3/12/98     <.592       <1.02      <1.53      <.152      <.368
       20           260738080162701      3/9/98     <.592       <1.02      <1.53      <.152      <.368
       21           261028080154901     3/12/98     <.592       <1.02      <1.53      E.041      <.368
       22           261158080151301     3/11/98     <.592       <1.02      <1.53      <.152      <.368
       23           261404080100601     3/10/98     <.592       <1.02      <1.53      <.152      <.368
       24           261533080141101     3/11/98     <.592       <1.02      <1.53      <.152      <.368
       25           261830080073101     3/10/98     <.592       <1.02      <1.53      <.152      <.368
       26           262156080063601     1/22/98     <.148       <.254      <.382      <.038      <.092
       27           262649080053801     1/21/98     <.148       <.254      <.382      <.038      <.092
       28           262858080083901     1/22/98     <.148       <.254      <.382      <.038      <.092
       29           263638080040301     1/21/98     <.148       <.254      <.382      <.038      <.092
       30           263656080121901     1/20/98     <.148       <.254      <.382      <.038      <.092