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Using Groundwater and Surface Water Models for the Marcus Hook Refinery. CE 394K.2 Surface Water Hydrology Presented by Julie Kim April 29, 1999. Marcus Hook Refinery, Pennsylvania Lube Area, southwestern part of the facility Marcus Hook Creek (MHC). Study Area. Objectives.

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Using Groundwater and Surface Water Models for the Marcus Hook Refinery


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using groundwater and surface water models for the marcus hook refinery

Using Groundwater and Surface Water Models for the Marcus Hook Refinery

CE 394K.2 Surface Water Hydrology

Presented by Julie Kim

April 29, 1999

study area
Marcus Hook Refinery, Pennsylvania

Lube Area, southwestern part of the facility

Marcus Hook Creek (MHC)

Study Area
objectives
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
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. Romanek’s GW and SW models

Max concentrations of COCs from spatial analysis

Data Sources
methodology
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

methodology6
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

Methodology
methodology7
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 Gringorten’s formula to calculate exceedance probability (b=0.44)
    • Calculate return period
    • 7Q10 corresponds to the minimum flow with a 10-year return period
results9
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 model’s regional flow of 7.7 cfs
future work
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