a. December 2006 groundwater upwelling survey results b. October-November 2007 groundwater upwelling survey results
Figure 4-18Groundwater Upewelling Survey Results
Chromium Transport StudyDundalk Marine Terminal, Baltimore, Maryland
Sampling during March-June 2007
0
5
10
15
20
25
30
35
40
45
50
9 9.5 10 10.5 11 11.5 12 12.5 13 13.5 14
Street
Cr+6
Con
cent
ratio
n (p
pm)
Zero flowNonzero flow
FIGURE 4-19a
FIGURE 4-19b
Summary of Storm Drain Hexavalent Chromium Concentrations during the Spring 2007 Sampling “Nonzero flow” indicates that there was no flow (sample was collected from standing water) or flow was negligible.
Sampling during October-December 2007
0
5
10
15
20
25
30
35
40
45
50
9 9.5 10 10.5 11 11.5 12 12.5 13 13.5 14
Street
Cr+6
Con
cent
ratio
n (p
pm)
Zero flowNonzero flow
Summary of Storm Drain Hexavalent Chromium Concentrations during the Fall 2007 SamplingNonzero flow” indicates that there was no flow (sample was collected from standing water) or flow was negligible.
ES022008025MKE
10th Street
Date Outfall Cr (mg/l)
Cr(VI)
(mg/l)
Flow Rate
(gpm)
11/30/2007 M-S1 0.0171 ND No Flow
11/30/2007 M-M1 0.018 ND No flow
11/30/2007 M-M2 0.0109 ND 7
11/30/2007 M-M5 0.171 ND No flow
10.5 Street
Date Outfall Cr (mg/l)
Cr(VI)
(mg/l)
Flow Rate
(gpm)
5/12/2007 I-116 0.021 ND No flow
5/12/2007 I-123 0.003 ND No flow
9th Street
Date Outfall Cr (mg/l)
Cr(VI)
(mg/l)
Flow Rate
(gpm)
12/21/2007 M-O53 0.0533 ND 100
12/21/2007 M-I2 1.39 0.74 8 to 10
9.5 Streeta
Date Outfall Cr (mg/l)
Cr(VI)
(mg/l)
Flow Rate
(gpm)
2/28/2007 I-17 0.07 0.07 No Flow
5/11/2007 I-17 0.76 0.93 No Flow
9/21/2007 I-17 ND ND No Flow
a - data collected to meet requirements of NPDES Permit
11.5 Street
Date Outfall Cr (mg/l)
Cr(VI)
(mg/l)
Flow Rate
(gpm)
5/9/2007 I-136 0.008 ND No flow
11th Street
Date Outfall Cr (mg/l)
Cr(VI)
(mg/l)
Flow Rate
(gpm)
10/12/2007 M-115 0.103 ND 5
10/12/2007 M-116 0.0747 ND 5
10/12/2007 M-117 0.155 0.14 No flow
10/12/2007 M-118 0.92 1 No flow
12th Street
Date Outfall Cr (mg/l)
Cr(VI)
(mg/l)
Flow Rate
(gpm)
10/4/2007 M-120 10.5 9.2 6.7
10/8/2007 M-121 15.3a
13a not measured
4/26/2007 M-122 11.1 10 No flow
10/8/2007 M-123 28.9a
24a not measured
4/26/2007 M-124 7.66 7.4 No flow
a - The sampling holding time was not met.
