Using%20Groundwater%20and%20Surface%20Water%20Models%20for%20the%20Marcus%20Hook%20Refinery - PowerPoint PPT Presentation
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Using%20Groundwater%20and%20Surface%20Water%20Models%20for%20the%20Marcus%20Hook%20Refinery
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Using Groundwater and Surface Water Models for the Marcus Hook Refinery ... of historical daily flow values for Chester Creek (CC) located in the same basin ... – PowerPoint PPT presentation
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Title: Using%20Groundwater%20and%20Surface%20Water%20Models%20for%20the%20Marcus%20Hook%20Refinery
1
Using Groundwater and Surface Water Models for
the Marcus Hook Refinery
- CE 394K.2 Surface Water Hydrology
- Presented by Julie Kim
- April 29, 1999
2
Study Area
- Marcus Hook Refinery, Pennsylvania
- Lube Area, southwestern part of the facility
- Marcus Hook Creek (MHC)
3
Objectives
- To incorporate results from GW model into SW
model - To calculate GW target level (CGW) so
concentrations in SW are not above applicable
SWQS (CSTD) in MHC - To compare SW model predictions for stream flow
with actual stream gauging results from USGS
4
Data Sources
- Act 2 requirements for diffuse GW modeling and
mixing calculations (PADEP) - CSTD Water quality criteria for eight COCs
(PADEP)
- Historical daily streamflows for PA (USGS)
- GW, SW, and WW flows from A. Romaneks GW and SW
models - Max concentrations of COCs from spatial analysis
5
Methodology
- Simple mass balance according to Act 2
- CGW CSTD QSW / 2q
- where CGW target level GW concentration
- CSTD SWQ criteria
- QSW Qharmonic for carcinogens or
- 7Q10 for non carcinogens
- 2q GW flow from both sides of MHC
6
Methodology
- No water data for MHC
- Use 66-years of historical daily flow values for
Chester Creek (CC) located in the same basin
(Lower Delaware) - Estimate streamflows for MHC by using simple
drainage area ratio - QMHC QCC AMHC / ACC
- Calculate Qharmonic for carcinogens
- Harmonic mean flow Total number of samples
- Sum of the reciprocal of flow
7
Methodology
- Use frequency analysis to calculate 7Q10 for non
carcinogens - Calculate mean of flows of 7 consecutive days for
all data - Calculate minimum flow during a 1-year period for
all flows - Sort minimum flows in descending order and rank
- Use Gringortens formula to calculate exceedance
probability (b0.44) - Calculate return period
- 7Q10 corresponds to the minimum flow with a
10-year return period
8
Results
9
Results
- Benzene measured in the Lube Area was above the
target GW concentration - Additional analyses should be conducted
- Measured peak concentrations of other COCs were
below CGW - Likely that no further action is warranted
- Total Qharmonic 8.76 cfs
- Total 7Q10 7.51 cfs
- USGS-based flow is close to SW models regional
flow of 7.7 cfs
10
Future Work
- Conduct additional analyses for COCs whose
concentrations were above CGW - Fate and transport modeling using GW
concentrations other than maximum concentrations - More sophisticated GW-SW interaction models
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