USGS

Biodegradation of Chlorinated Ethenes at a Karst Site in Middle Tennessee

Table 8. Chlorinated-ethene data for samples from selected wells


[Data from Tennessee Division of Superfund files; TCE, trichloroethylene; cDCE, cis-1,2-dichloroethylene; VC, vinyl chloride; μg/L, micrograms per liter; --, no data; <, less than]

_______________________________________________________________________________________________________________________
	  Date	           TCE	         cDCE	    VC		           Date	          TCE	   cDCE	      VC	
Well	 sampled          (μg/L)        (μg/L)    (μg/L)	 Well	  sampled        (μg/L)   (μg/L)    (μg/L)
_______________________________________________________________________________________________________________________

2S	10/31/85	 950,000          --	     --	          5S	  08/10/96	   137	     89	       <1
2S	11/05/85	 750,000	  --	     --	          5S	  11/10/96	    97	     46	        4		
2S	11/12/85       1,080,000	  --	     --	          5S	  02/11/97	   274	    119	       <1	
2S	01/03/86	 920,000	  --	     --	          5S	  08/22/97	   744	     43	       <1		
2S	01/09/87	 520,000	  --      5,300	          5S	  11/05/97	   490	    365	       <1		
2S	02/05/87	 800,000	  --	 88,000	          5S	   5/21/98       1,440	    504	       <1	
2S	03/13/87	  36,000	  --	    <10	          6S	  10/31/85	   270	     --	       --	
2S	11/13/88	 730,000	  --	     --	          6S	  11/05/85	   490	     --	       --	
2S	05/16/91	     <10	  --	    <10	          6S	  11/12/85	   720	     --	       --
2S	10/25/91	  68,000	  --	 <5,000	          6S	  01/03/86	   250	     --	       --
2S	02/10/92	  80,000	  --	  4,500	          6S	  01/09/87	    32	     --	      <10	
2S	04/17/92	 170,000	  --	 <5,000	          6S	  02/05/87	   120	     --	    1,300	
2S	07/31/92       1,800,000	  --   <200,000	          6S	  03/13/87	   <10       --	       <1
2S	02/24/93	  48,000	  --	  1,900	          6S	  11/13/88	    62	     --	       --	
2S	05/14/93	  52,000	  --	  2,200	          6S	  05/16/91       2,100	     --	      <10	
2S	05/01/94	 300,000     100,000	  3,000	          6S	  10/25/91	    22	     --	      <10		
2S	08/01/94	 350,000	 <20	  2,900	          6S	  02/10/92	    15	     --	      <10	
2S	11/01/94	 190,000      54,000	   <500	          6S	  04/17/92	     3	     --	       23
2S	02/01/95	 140,000      53,000 	  3,400 	  6S	  07/31/92	     5	     --	      <10	
2S	05/01/95	 170,000      46,000 	   <500	          6S	  10/30/92	     8	     --	      <10	
2S	08/01/95	 270,000      35,000 	 <5,000	          6S	  02/24/93	    <5       --        <1
2S	11/01/95	 129,600      36,900 	  2,160 	  6S	  05/14/93	     3	     --	      <10	
2S	02/01/96	 151,200      36,450 	  2,300 	  6S	  10/22/93	    <5	     --	       75
2S	05/10/96	 352,000      48,000 	  3,300 	  6S	  02/09/94	     4	     --	      <10	
2S	08/10/96	 287,000      43,000 	  4,000 	  6S	  05/01/94	    95	  1,300	      <25	
2S	11/10/96	 186,000      32,000 	  2,050 	  6S	  08/01/94	   <25	    340	      <25	
2S	02/11/97	  80,200      45,200 	  1,810 	  6S	  11/01/94	     1	     32	       12	
2S	08/22/97	 171,000      34,500 	   <500	          6S	  02/01/95	    <1	    170	        1
2S	 5/21/98	  92,250      27,090 	  1,080 	  6S	  05/01/95	    <1       86        21
5S	10/31/85	   5,600 	  --	     --	          6S	  08/01/95	    <3	     39	       <3	
5S	11/05/85	   9,800 	  --	     --	          6S	  11/01/95	    <2	     98	       14	
5S	11/12/85	  14,800 	  --	     --	          6S	  02/01/96	    <1	    136	       40
5S	01/03/86	  16,600 	  --	     --	          6S	  05/10/96	    <1	    170	       49	
5S	01/09/87	 110,000 	  --	    900	          6S	  08/10/96	    <1	    516	      106	
5S	02/05/87	 280,000 	  --	 21,000 	  6S	  11/10/96	    12	     81	       14
5S	03/13/87	 130,000 	  --	    <10	          6S	  02/14/97	     3	    114	       22	
5S	11/13/88	  68,100 	  --	     --	          6S	  08/27/97	    <1	     80	       42
5S	05/16/91	 320,000 	  --	  4,300 	  6S	   5/21/98	    <1	     86	       27	
5S	10/25/91	   3,000 	  --	   <100	          7S	  10/31/85	48,000 	     --	       --	
5S	02/10/92	     910	  --	     30	          7S	  11/05/85	31,000 	     --	       --
5S	04/17/92	     470	  --	     10	          7S	  11/12/85	71,000 	     --	       --	
5S	07/31/92	   5,400 	  --	   <500	          7S	  01/03/86	31,000 	     --	       --	
5S	10/30/92	   4,400 	  --	   <500	          7S	  01/09/87     430,000 	     --	       56	
5S	02/24/93	   2,700 	  --	   <250	          7S	  02/05/87     120,000 	     --	      <10	
5S	05/14/93	 160,000 	  --	   <500	          7S	  03/13/87     150,000 	     --	       <1
5S	02/09/94	     980	  --	   <100	          7S	  11/13/88	18,900 	     --	       --	
5S	05/01/94	     650       1,700 	    <25	          7S	  05/16/91	95,000 	     --	      400
5S	08/01/94	   2,400 	 960	    <25	          7S	  10/25/91	59,000 	     --	      290
5S	11/01/94	   1,300 	 170	    <25	          7S	  02/10/92	75,000 	     --	   <5,000
5S	02/01/95	   1,100 	 300	    <50	          7S	  04/17/92     200,000 	     --	   <5,000
5S	05/01/95	     160	 170	    <50	          7S	  07/31/92     160,000 	     --	  <10,000
5S	08/01/95	     200	 110	     <5	          7S	  10/30/92	92,000 	     --	  <10,000
5S	11/01/95	     148	 108	     12	          7S	  02/24/93	93,000 	     --	   <5,000
5S	02/01/96	      71	 110	      3	          7S	  05/14/93     140,000 	     --	  <10,000
5S	05/10/96	     221	 285	     <1	          7S	  10/22/93	82,000 	     --	  <10,000

_______________________________________________________________________________________________________________________
	  Date	           TCE	         cDCE	    VC		           Date	          TCE	   cDCE	      VC	
Well	 sampled          (μg/L)        (μg/L)    (μg/L)	 Well	  sampled        (μg/L)   (μg/L)    (μg/L)
_______________________________________________________________________________________________________________________

7S	02/09/94	      87	  --	    <10	          20S	  02/01/95	49,000  110,000     5,100 	
7S	05/01/94	 140,000     120,000	   <500	          20S	  05/01/95	52,000 	 64,000     2,400 	
7S	08/01/94	  16,000      22,000	    500	          20S	  08/01/95     120,000 	 79,000     4,800 	
7S	11/01/94	  17,000      28,000	   <500	          20S	  11/01/95	 6,300 	  1,200        36
7S	02/01/95	   6,400      23,000	   <500	          20S	  02/01/96	60,750 	 28,350     4,100 	
7S	05/01/95	  18,000      28,000	   <500	          20S	  05/10/96	92,000 	124,000     8,500 	
7S	08/01/95	  47,000      52,000 	   <500	          20S	  08/10/96	80,000 	115,000    10,000
7S	11/01/95	  12,800      24,920 	    146	          20S	  11/10/96	78,000 	102,000     8,500 	
7S	02/01/96	     810       1,163 	     21	          20S	  02/19/97	31,200 	 99,200    10,200 
7S	05/10/96	  10,930      10,100 	     70	          20S	  08/27/97	40,000 	 77,000     3,000 	
7S	08/10/96	   5,660       7,850 	     85	          20S	   5/21/98	18,000 	 76,950	    9,180	
7S	11/10/96	   8,350       8,750 	     64	          33S	  10/22/93	    <5	     --	    2,000	
7S	02/11/97	     808       1,110 	      5	          33S	  02/09/94	  <100	     --	      480
7S	08/22/97	   6,600      13,800 	     <1	          33S	  05/01/94	     2	    110	      140
7S	11/05/97	   3,800      16,300 	     61	          33S	  08/01/94	     1	      1	        5 
7S	 5/21/98	   7,785      27,140 	   <450	          33S	  11/01/94	     1	  2,400	    4,100
11S	01/09/87	      35	  --	    <10	          33S	  02/01/95	     3	  2,400	    2,900
11S	02/05/87	     <10	  --	     11	          33S	  05/01/95	   300	  3,400	    1,500
11S	03/13/87	     <10	  --	    <10	          33S	  08/01/95	   140	  4,800	    1,600
11S	11/13/88	      36	  --	     --	          33S	  11/01/95	    12	  3,500	    1,900
11S	02/10/92	      14	  --	    <10	          33S	  02/01/96	    <1	  7,200	    2,500
11S	04/17/92	      <5	  --	    <10	          33S	  05/10/96	  <100	 10,700	    3,100
11S	07/31/92	      13	  --	    <10	          33S	  08/10/96	  <100	 11,200	    4,600
11S	10/30/92	      33	  --	    <10	          33S	  11/10/96	  <100	 17,700	    4,900
11S	02/24/93	      17	  --	    <10	          33S	  02/11/97	    39	 14,300	    2,980
11S	05/14/93	      20	  --	    <10	          33S	  08/22/97	  <100	 14,600	    3,500
11S	10/22/93	      31	  --	    <10	          33S	   5/21/98	  <900	 30,330	    2,250
11S	02/09/94	      18	  --	    <10	          34S	  10/22/93	  <500	     --	      770
11S	05/01/94	      18	  58	     <1	          34S	  02/09/94	25,000 	     --	   <5,000
11S	08/01/94	      18	  50	     <1	          34S	  05/01/94	    55	    400	      720
11S	11/01/94	      15	  41	     <1	          34S	  08/01/94	   140	  1,800	    2,400
11S	02/01/95	      14	  33	     <1	          34S	  11/01/94	 8,400 	  8,200	     <100
11S	05/01/95	       7	  25	     <1	          34S	  02/01/95	   810	  2,900	    1,300
11S	08/01/95	      11	  26	     <1	          34S	  05/01/95	   300	  2,500	      130
11S	11/01/95	       8	  21	     <1	          34S	  08/01/95	   180	  5,700	      670
11S	02/01/96	       9	  33	     <1	          34S	  11/01/95	   675	  5,490	      900
11S	05/10/96	       7	  20	     <1	          34S	  02/01/96	 1,140 	  3,290	      710
11S	08/10/96	       6	  38	     <1	          34S	  05/10/96	   460	 15,620	    3,940
11S	11/10/96	       9	  26	     <1	          34S	  08/10/96	   368	  3,200	    1,400
11S	02/18/97	       7	  40	     <1	          34S	  11/10/96	   115	  1,850	      709
11S	08/27/97	       6	  32	     <1	          34S	  02/18/97	 1,200 	  3,800	    1,130
11S	 5/21/98	      <1	   2	     <1	          34S	  08/26/97	     2	    820	      350
20S	01/09/87	 270,000 	  --	 <2,000	          34S	   5/21/98	   212	  1,449	      338
20S	02/05/87	 530,000 	  --	    <10	          35S	  10/22/93	    <5	     --	      <10
20S	03/13/87	 500,000 	  --	    <10	          35S	  02/09/94	     6	     --	      <10	
20S	11/13/88	  79,000 	  --	     --	          35S	  05/01/94	   280	    110	        2	
20S	05/16/91	  61,000 	  --	    <10	          35S	  08/01/94	     2	     11	        1
20S	10/25/91	  54,000 	  --	 <5,000	          35S	  11/01/94	     5	     38	       <1
20S	02/10/92	 290,000 	  --	<10,000	          35S	  02/01/95	    <3	     16	       <3	
20S	04/17/92	  13,000 	  --	 11,000 	  35S	  05/01/95	    <1	      7	       <1
20S	10/30/92	 460,000 	  --	<10,000	          35S	  08/01/95	     3	     27	       <1	
20S	02/24/93	 360,000 	  --	<10,000	          35S	  11/01/95	     6	     38	        8
20S	05/14/93	 960,000 	  --	  4,700 	  35S	  02/01/96	     4	     24	       <1	
20S	10/22/93	 380,000 	  --	<25,000	          35S	  05/10/96	     3	     16	       <1	
20S	02/09/94	 558,000 	  --	<50,000	          35S	  08/10/96	    <1	     20	        3
20S	05/01/94	  49,000      36,000 	  1,700 	  35S	  11/10/96	     1	     18	        2
20S	08/01/94	  13,000     150,000 	  3,000 	  35S	  02/13/97	     4	      8	       <1
20S	11/01/94	 180,000      90,000 	   <500	          35S	  08/27/97	     2	     29	        5
_______________________________________________________________________________________________________________________
	  Date	           TCE	         cDCE	    VC		           Date	          TCE	   cDCE	      VC	
Well	 sampled          (μg/L)        (μg/L)    (μg/L)	 Well	  sampled        (μg/L)   (μg/L)    (μg/L)
_______________________________________________________________________________________________________________________

35S	 5/21/98	       2	  17	      1	          1D	  11/05/97	     3	     35	      119
37S	10/22/93	      <5	  --	    <10	          1D	   5/21/98	     8	     12	        5
37S	02/09/94	      <5	  --	    <10	          2D	  02/14/89	   <10	     --	       --
37S	05/01/94	      <5	  <5	     <5	          2D	  04/20/89	    <5	     --	       --
37S	08/01/94	      <1	  <5	      3	          2D	  02/28/91	 3,900       --	       --
37S	11/01/94	      <1	  <1	     <1	          2D	  04/11/91	 5,200 	     --	       16
37S	02/01/95	      <1	  <1	     <1	          2D	  07/25/91	16,000 	     --	       13
37S	05/01/95	      <1	  <1	     <1	          2D	  10/18/91	90,000 	     --	      440
37S	08/01/95	      <1	  <1	     <1	          2D	  02/19/92     130,000 	     --	    1,400
37S	11/01/95	      <1	  <1	     <1	          2D	  04/15/92	68,000 	     --	   <5,000
37S	02/01/96	      <1	  <1	     <1	          2D	  07/31/92	59,000 	     --	   <5,000
37S	05/10/96	      <1	   1	     <1	          2D	  10/30/92     130,000 	     --	      <10
37S	08/10/96	      <1	  <1	     <1	          2D	  02/26/93	51,000 	     --	  <10,000
37S	11/10/96	      <1	  <1	     <1	          2D	  05/19/93	17,000 	     --	   <1,000
37S	02/18/97	      <1	  <1	     <1	          2D	  10/22/93	27,000 	     --	    6,800 
37S	08/27/97	      <1	  <1	     <1	          2D	  02/10/94	 8,000 	     --	    1,000 
37S	 5/21/98	      <1	  <1	     <1	          2D	  05/01/94	14,000 	 16,000       <25
42S	08/01/94	       1	  10	      1	          2D	  08/01/94	11,000 	  3,900      <250
42S	11/01/94	     250	 <50	    <50	          2D	  11/01/94	38,000 	 12,000	     <500
42S	02/01/95	      <1	  <1	     <1	          2D	  02/01/95	 1,700 	    540	       <1
42S	05/01/95	      <1	  <1	     <1	          2D	  05/01/95	   510	  8,300	     <500
42S	08/01/95	      <1	  <1	     <1	          2D	  08/01/95	 8,300 	  2,000	     <100
42S	11/01/95	      <1	  <1	     <1	          2D	  11/01/95     101,700 	106,200	    4,500
42S	02/01/96	      <1	  <1	     <1	          2D	  02/01/96	 2,990 	  6,400	    1,005
42S	05/10/96	      <1	   1	     <1	          2D	  05/10/96	 1,650 	  5,100	    1,165
42S	08/10/96	      <1	  <1	     <1	          2D	  08/10/96	 1,500 	  2,300	       50
42S	11/10/96	      <1	  <1	     <1	          2D	  11/10/96	 1,590 	  2,680	      <10
42S	08/18/97	      <1	  <1	     <1	          2D	  02/11/97	   915	  1,390	      245
42S	08/27/97	      <1	  <1	     <1	          2D	  05/20/97	 5,290 	    520	       38
42S	 5/21/98	      <1	   4	     <1	          2D	  08/22/97	   168	    467	      256
1D	02/14/89       3,998,000 	  --	     --	          2D	  11/05/97	   880	  5,700	      760
1D	04/20/89	 260,000 	  --	     --	          2D	   2/17/98	   597	  1,070	      156
1D	02/28/91	     180	  --	     --	          2D	   5/21/98	   116	    511	       73
1D	04/11/91	     180	  --	    160	          3D	  01/25/90      26,000 	     --	       --
1D	07/25/91	     <10	  --	    400	          3D	  02/28/91	 2,900 	     --	       --
1D	10/18/91	      96	  --	     17	          3D	  04/11/91	 2,200 	     --	      120
1D	02/06/92	      12	  --	  2,600 	  3D	  07/25/91	   240	     --	       13
1D	04/15/92	      54	  --	      8	          3D	  10/18/91	    <5	     --	      390
1D	07/31/92	      48	  --	    <10	          3D	  02/06/92	   130	     --	      170
1D	10/30/92	      <5	  --	    <10	          3D	  04/15/92	    34	     --	      <10
1D	02/26/93	      32	  --	    450	          3D	  07/31/92	 1,100 	     --	      <50
1D	05/19/93	      32	  --	      9	          3D	  10/30/92	    30	     --	      <10
1D	10/22/93	      18	  --	  1,000 	  3D	  02/26/93	    11	     --	      <10
1D	02/10/94	       7	  --	  3,500 	  3D	  05/19/93	    14	     --	      <10
1D	05/01/94	      29	  14	     19	          3D	  10/22/93	    <5	     --	      <10	
1D	08/01/94	     140	  24	     <3	          3D	  02/10/94	    12	     --	       16
1D	11/01/94	     270	 300	     46	          3D	  05/01/94	    39	     25	       19
1D	02/01/95	       9	 120	    110	          3D	  08/01/94	     3	     48	       12
1D	05/01/95	       3	 130	    220	          3D	  11/01/94	    43	     47	       <1
1D	08/01/95	       5	  18	     25	          3D	  02/01/95	    <1	      2	       <1
1D	11/01/95	      28	  47	     65	          3D	  05/01/95	     4	      7	       <1
1D	02/01/96	       8	 119	    740	          3D	  08/01/95	     5	      7	       <1
1D	05/10/96	      10	  81	    940	          3D	  11/01/95	     6	      5        10
1D	08/10/96	      89	  20	     24	          3D	  02/01/96	     4	      7	        2
1D	11/10/96	      55	  13	     46	          3D	  05/10/96	    <1	      1	       <1
1D	02/11/97	      <1	   6	      5	          3D	  08/10/96	     1	    725	      176
1D	08/22/97	      14	  10	      3	          3D	  11/10/96	     3	    183	       73
_______________________________________________________________________________________________________________________
	  Date	           TCE	         cDCE	    VC		           Date	          TCE	   cDCE	      VC	
Well	 sampled          (μg/L)        (μg/L)    (μg/L)	 Well	  sampled        (μg/L)   (μg/L)    (μg/L)
_______________________________________________________________________________________________________________________

3D	02/12/97	       2	  60	     19	          10D-A	  02/06/92	 3,600 	     --	     <100	
3D	08/22/97	       2	   6	     <1	          10D-A	  02/12/92	 3,100 	     --	     <100	
3D	11/05/97	      <1	  19	     <1	          10D-A	  04/15/92	 1,800 	     --	     <250	
3D	 5/21/98	      <1	 230	    140	          10D-A	  07/31/92	   340	     --	     <100	
4D	01/25/90	   2,300 	  --	     --	          10D-A	  10/30/92	   900	     --	      <10	
4D	02/28/91	     210	  --	     --	          10D-A	  02/26/93	   190	     --	      <10	
4D	04/11/91	     180	  --	    150	          10D-A	  05/19/93	   280	     --	     <100	
4D	07/25/91	      48	  --	    <10	          10D-A	  10/22/93	   780	     --	     <100	
4D	10/18/91	      <5	  --	    <10	          10D-A	  02/10/94	   160	     --	      <20	
4D	02/06/92	      31	  --	     12	          10D-A	  05/01/94	   110	     33	       <5
4D	04/15/92	   1,100 	  --	    <10	          10D-A   08/01/94	    70	     71	       <1
4D	07/31/92	     250	  --	   <100	          10D-A	  11/01/94	   120	     79	       <1
4D	10/30/92	      <5	  --	    <10	          10D-A	  02/01/95	     5	     34	       <1	
4D	02/26/93	       2	  --	    <10	          10D-A	  05/01/95	    73	     42	       <1	
4D	05/19/93	     190	  --	    <10	          10D-A	  08/01/95	    29	     15	       <1
4D	10/22/93	      <5	  --	    <10	          10D-A	  11/01/95	    86	     39	       <2	
4D	02/10/94	      <5	  --	    <10	          10D-A   02/01/96	    46	     24	       <1
4D	05/01/94	      43	   7	     <1	          10D-A	  05/10/96	    39	     15	       <1	
4D	08/01/94	       6	   1	     <1	          10D-A	  08/10/96	    10	      8	       <1
4D	11/01/94	      82	  27	     <1	          10D-A	  11/10/96	    30	     14	       <1
4D	02/01/95	      <1	   3	     <1	          10D-A	  02/21/97	    35	     18	       <1
4D	05/01/95	       9	   3	     <1	          10D-A	  08/26/97	     1	     <1        <1
4D	08/01/95	      <1	  <1	     <1	          10D-A	   5/21/98	     7	     16	        4	
4D	11/01/95	       2	  <1	     <1	          10D-B	  02/06/92	   280	     --	      <10	
4D	02/01/96	       1	   2	     <1	          10D-B	  02/19/92	   150	     --	      <10
4D	05/10/96	       7	   4	     <1	          10D-B	  04/15/92	   160	     --	      <10
4D	08/10/96	      98	 524	      2	          10D-B	  07/31/92	   140	     --	      <10	
4D	11/10/96	       8	  60	      7	          10D-B	  10/30/92	   120	     --	      <10
4D	02/12/97	       2	   6	     <1	          10D-B	  02/26/93	   120	     --	       15
4D	08/22/97	      <1	  <1	     <1	          10D-B	  05/19/93	    81	     --	       32
4D	 5/21/98	      <1	  <1	     <1	          10D-B	  10/22/93	   150	     --	      <10	
5D	01/25/90	       7	  --	     --	          10D-B	  02/10/94	    75	     --	       <4	
5D	02/28/91	      <5	  --	     --	          10D-B	  05/01/94	    51	     45	        6	
5D	04/11/91	      <5	  --	     <5	          10D-B	  08/01/94	    59	     91	        6
5D	07/25/91	     <10	  --	    <10	          10D-B	  11/01/94	    32	    130	       33
5D	10/18/91	      93	  --	     <5	          10D-B	  02/01/95	    19	     30	        3
5D	02/06/92	      20	  --	    <10	          10D-B	  05/01/95	    33	     45	       <1
5D	04/15/92	   1,300 	  --	    <10	          10D-B	  08/01/95	    37	     38	       <1	
5D	07/31/92	      49	  --	    <10	          10D-B	  11/01/95	    60	     46	       10
5D	10/30/92	     360	  --	   <100	          10D-B	  02/01/96	    35	     37	        4
5D	02/26/93	      <5	  --	    <10	          10D-B	  05/10/96	    50	     47	        1	
5D	05/19/93	     170	  --	    <10	          10D-B	  08/10/96	    11	     42	       14	
5D	10/22/93	      45	  --	    <10	          10D-B	  11/10/96	    50	     44	       <1	
5D	02/10/94	      <5	  --	    <10	          10D-B	  02/21/97	    24	     38	        1
5D	05/01/94	      15	  25	     <1	          10D-B	  05/22/97	    46	     35	        1
5D	08/01/94	      31	   5	     <1	          10D-B	  08/22/97	    <1	      6	        6
5D	11/01/94	      20	   7	     <1	          10D-B	  11/04/97	     9	     15	        8
5D	02/01/95	       6	  11	     <1	          10D-B	   2/17/98	    <2       <2	       <2
5D	05/01/95	      <1	  <1	     <1	          10D-B	   5/21/98	    <1	     <1        <1
5D	08/01/95	       4	   7	     <1	          10D-C	  02/01/96	    86	     45	       <1
5D	11/01/95	       8	   1	     <2	          10D-C	  05/10/96	    76	     38	        1
5D	02/01/96	      <1	  <1	     <1	          10D-C	  08/10/96	    36	     33	       <1
5D	05/10/96	      <1	  <1	     <1	          10D-C	  11/10/96	    35	     25	       <1
5D	08/10/96	      <1	   2	      4	          10D-C	  02/21/97	    21	     20	       <1
5D	11/10/96	       2	  <1	      2	          10D-C	  08/26/97	     7	      4	       <1
5D	02/13/97	      <1	  <1	     <1	          10D-C	   5/21/98	    <1	     <1        <1
5D	08/26/97	       2	  <1	     <1	          11D	  02/06/92	 5,900       --	     <100	
5D	 5/21/98	      <1	  <1	     <1	          11D	  02/19/92	   700	     --	       13
_______________________________________________________________________________________________________________________
	  Date	           TCE	         cDCE	    VC		           Date	          TCE	   cDCE	      VC	
Well	 sampled          (μg/L)        (μg/L)    (μg/L)	 Well	  sampled        (μg/L)   (μg/L)    (μg/L)
_______________________________________________________________________________________________________________________

11D	04/15/92	     720	  --	    <50	          12D	  11/10/96	 1,700 	    180	      <10
11D	07/31/92	     390	  --	   <100	          12D	  02/13/97	    <1       <1	       <1
11D	10/30/92	   1,000 	  --	    <50	          12D	  05/22/97	 1,240 	    220	      <10
11D	02/26/93	     500	  --	    <50	          12D	  08/22/97	   400	     95	       <1
11D	05/19/93	     500	  --	   <100	          12D	  11/04/97	 1,125 	    376	       <1	
11D	10/22/93	     200	  --	   <100	          12D	   2/17/98	    18	      4	       <2
11D	02/10/94	     910	  --	    <50	          12D	   5/21/98	   170	      8	        4
11D	05/01/94	   1,400       1,400	     10	          13D	  10/22/93	 4,600 	     --	      <10
11D	08/01/94	     650	 750	    <25	          13D	  02/10/94	 1,400 	     --	     <100
11D	11/01/94	     970	 800	    <50	          13D	  05/01/94	   180	     23	       <5
11D	02/01/95	     540	 450	      4	          13D	  08/26/97	   255	    203	        3
11D	05/01/95	     650	 350	    <25	          13D	  10/14/97	    71	    102	        2
11D	08/01/95	     540	 420	    <25	          13D	  11/05/97	    62	     72	       <1
11D	11/01/95	     420	 335	      9	          14D	  10/22/93	 2,800 	     --	      <10
11D	02/01/96	     416	 263	      1	          14D	  02/10/94	   610	     --	       17
11D	05/10/96	     140	 410	     <5	          14D	  05/01/94	   470	    140	       12
11D	08/10/96	      42	 274	      1	          14D	  08/01/94	   210	    130	       <3
11D	11/10/96	      68	 171	     <1	          14D	  11/01/94	   130	    150	       <5
11D	02/12/97	       3	 142	     <1	          14D	  02/01/95	   150	    170	        2
11D	08/22/97	      <1	  71	     <1	          14D	  05/01/95	   180	    84	       <5
11D	 5/21/98	      <1	  27	      4	          14D	  08/01/95	   120	     92	       <1
12D	02/06/92	 200,000 	  --	   <480	          14D	  11/01/95	   198	    138	       16
12D	02/12/92	 230,000 	  --	 <1,000	          14D	  02/01/96	   252	    234	       21
12D	04/15/92	  14,000 	  --	 <1,000	          14D	  05/10/96	   428	    230	       10
12D	07/31/92	  10,000 	  --	 <1,000	          14D	  08/10/96	   320	    310	        8
12D	10/30/92	   2,300 	  --	    <10	          14D	  11/10/96 	   290	    232	        6
12D	02/26/93	     170	  --	     15	          14D	  02/12/97	   198	    382	       28
12D	05/19/93	   2,100 	  --	      7	          14D	  05/22/97	   520	    310	      <10
12D	10/22/93	   2,200 	  --	    <20	          14D	  08/26/97	   270	    330	       24
12D	02/10/94	       7	  --	    <10	          14D	  11/05/97	   305	    505	       58
12D	05/01/94	   1,400 	 550	      5	          16D-A	  05/28/97	    <1	      2	       <1
12D	08/01/94	   1,800       1,100	    <50	          16D-A	  08/26/97	    <1	      3	       <1
12D	11/01/94	     950	 410	     <5	          16D-A	  11/04/97	    <1	      2	       <1
12D	02/01/95	     620	 670	      3	          16D-A	   2/17/98	    <2	     <2	       <2	
12D	05/01/95	     730	  90	    <50	          16D-A	   5/21/98	    <1	     <1	       <1
12D	08/01/95	     690	 270	    <25	          16D-B	  05/28/97	    <1        2        <1
12D	11/01/95	     920	 240	     11	          16D-B	  08/22/97	    <1	      5	       <1
12D	02/01/96	   1,500 	 300	      6	          16D-B	  11/04/97	    <1	      3	       <1
12D	05/10/96	   1,250 	 250	     <5	          16D-B	   2/17/98	    <2	      7	       <2	
12D	08/10/96	   1,850 	 650	     21	          16D-B	   5/21/98	    <1	     <1	       <1	
____________________________________________________________________________________________________________________

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