400

350

300 .. GI 250 .Q

E :J z 200 '! ~ 150

100

so

0

04/10 MFE

LEGEND

II Total Samples

11 Detects

II Detects > GSI

King Highway Landfill OU 2003 -2009

22

0

... .. ...

15

§ 10 z

Kzoo/PlainwelVGW Monitoring/GW Handoutcdr 0

500 .____

400 ---

j E 300 --­:J z

200 ....__

100 ....___

0 "'-----

12th Street Landfill OU 1995

0 0

Willow Blvd/A-Site Landfill OU 2000

... .! E

so +---

40 --

~ 30 +---

~ F 20 +---

10 +---

O""--

All Landfill OUs 1995-2009

4

0

.. GI

.Q E :J z 5 {:.

Allied Paper, Inc. Landfill OU Groundwater

2002-2003

50

40

30

20

10 2

0

Allied Paper, Inc. Landfill OU Seeps

2002-2003

Page 1

PCB flux calculated using MDNRE approach to calculating mixing zone-based GSI criteria, assuming: • Hydraulic conductivity of 10-3 cm/s • Hydraulic gradients ranging from 0.13 to 0.205 ft/ft • River flow from 350 to 1,061 cfs • PCB concentrations of Y2 detection limit (0.024 µg/L) • Upstream PCB concentration of 0 µg/L

Average annual groundwater PCB flux loads range from 0.014 to 0.032 kg/yr

One year of bank erosion equals 700 to 1,500 years of groundwater flux.

Worksheet for Estimating Flux of PCBs in Former Plainwell lmpoundment Groundwater to Kalamazoo River

p

G'raundwateli Discharge - - -.: - - - - ---- - - - r I -

11

I Fi.nal Average t:

Area Hydraulic Hydrraulic Groundwater Qeslgn D'ilution 1 Avei:age ' Upstream. AverageGW Generic

~ 1• lnstream

Parameter CQnductlvity Gradient (i) FIQW (Qp) Stream Flow Ratio Concentration Goncentation Concentration

PCB ILoad GSI Value tength D~ptfl Area (k) (ft/sec) (ftJft) 1 (cfS) I (QsJ {Cfs )2 (Qs/Qp) (ugnf (ug/I) (JCgf~r) (ug/L) ' I (ft) (ft) (sq ft) -~

' (ugll) r. I

' - ··-- - -

Min Hydraulic Gradient 10000 15 150000 0.00003281 0.13 0.6398 350 547 0.024 0 0.000044 0.013711 0.2 Avg observed hyd gradient 10000 15 150000 0.00003281 0.205 1.0089 350 347 0.024 0 0.000069 0.021622 0.2 Max observed hyd gradient 10000 15 150000 0.00003281 0.3 1.4764 350 237 0.024 0 0.000101 0.031642 0.2 With 30-year Harmonic Mean 10000 15 150000 0.00003281 0.13 0.6398 1061 1659 0.024 0 0.000014 0.013711 0.2 With 30-year Harmonic Mean 10000 15 150000 0.00003281 0.205 1.0089 1061 1052 0.024 0 0.000023 0.021622 0.2 With 30-year Harmonic Mean 10000 15 150000 0.00003281 0.3 1.4764 1061 719 0.024 0 0.000033 0.031642 0.2 With 90-year Harmonic Mean 10000 15 150000 0.00003281 0.13 0.6398 864 1350 0.024 0 0.000018 0.013711 0.2 With 90-year Harmonic Mean 10000 15 150000 0.00003281 0.205 1.0089 864 856 0.024 0 0.000028 0.021622 0.2 With 90:-year Harmonic Mean 10000 15 150000 0.00003281 0.3 1.4764 864 585 0.024 0 0.000041 0.031642 0.2

NOTES: Worksheet derived from MDEQ Operational Memorandum RRD-5, Attachment 1 - Request to MDEQ for Mixing Zone-Based GSI Criteria (http://www.michigan.gov/documents/deq/deq-rrd-OpMemo_5_Form_286639_7.pdf). 1Based on groundwater and surface water elevation monitoring. 2Based on Comstock gage station data and increased by 25% to adjust for drainage area. 3Based on one-half the detection limit.

04/10MFE Kzoo/Plainwell/GW Monitoring/GW Handout.cdr

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