Table 1 PCE concentrations (ug/L) measured in water samples according to characteristics of sampling location and methods

All Samples

88

43

49

66

0.5

32

ND-2432

According to:

Complexity of pipe configuration^c

   Simple

31

13

42

73

20

50

ND-780

   Complex

57

30

53

63

ND

22

ND-2432

Magnitude of flow^c

   High (> 19 homes)

19

11

58

10

ND

20

ND-59

   Medium (3–19 homes)

33

22

67

18

ND

20

ND-190

   Low (< = 2 homes)

36

10

28

141

18

57

ND-2432

Position along pipe^c

   End

44

16

36

56

12

37

ND-780

   Beginning/Middle

44

27

61

77

ND

25

ND-2432

Overestimated housing density^c

   Yes

25

11

44

182

6.6

38

ND-2432

   No

63

32

51

20

ND

28

ND-235

Season sampled^c

   Spring

74

42

57

77

ND

38

ND-2432

   Autumn

14

1

7

7.7

4.6

11

ND-44

Water fixture sampled^c

   Tap or spigot

10

3

30

302

32

190

ND-2432

   Hydrant

18

7

39

26

21

35

ND-92

   Unknown

60

33

55

39

ND

18

ND-780

Sampling personnel^c

   Sampler 1

69

33

48

38

0.5

31

ND-780

   Sampler 2

18

10

56

43

ND

28

ND-350

   Sampler 3

1

0

0

2432

---^d

---^d

---^d

Town^c

   Barnstable

7

7

100

ND

ND

ND

ND-ND

   Bourne

16

10

63

57

ND

26

ND-540

   Brewster

7

2

29

140

32

100

ND-780

   Chatham

6

5

83

4.9

ND

ND

ND-28

   Falmouth

6

1

17

47

53

62

ND-75

   Provincetown

5

5

100

ND

ND

ND

ND-ND

   Sandwich

9

3

33

36

22

59

ND-92

   Plymouth

25

7

28

128

3.1

13

ND-2432

   Wareham

7

3

43

15

20

28

ND-35

Pipe installation year^c

   1968–1972

23

16

70

38

ND

1

ND-780

   1973–1976

32

15

47

18

4.6

25

ND-100

   1977–1980

33

12

36

134

22

59

ND-2432