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Calhoun Park Area (CPA)
Last Updated: July 3, 2008

Site Identifying Information

*Site Name:

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Design and Operation Factors

Technology Design and Operation:

Vendor:

*Oxidant Type:

Other Oxidant Type:

Number of Oxidant Injections or Passes:

Total Quantity of Oxidant:

Volume of Media Treated:

Concentration of Oxidant:

*Date Operation Began:

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Summary and Description of Performance Data:

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Residual Groundwater Plume Management:

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Project Data Elements

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*Contaminants of Concern:

Chemical Name	Conc.	Units	Comments












Other Contaminant of Concern:

Extent size of area of contamination:

Presence of naturally occuring carbon?

*Geologic Setting:

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Geology and hydrogeology detailed description:

The following sequence of hydrostratigraphic units have been identified to locally the CPA site: fill material/upper sand, upper clay, upper intermediate sand, middle intermediate sand, lower intermediate sand,  and Ashley Formation of the Cooper Group. The deposits above the Ashley Formation represent partially filled-backbarrier, barrier island, and shallow-marine-shelf deposits that formed during interglacial periods.  The upper clay unit is relatively shallow (approximately 10 feet below ground surface (bgs) on average) and acts as a layer of low permeability that impedes the vertical migration of DNAPL and dissolved phase constituents that are present in the shallow groundwater at portions of the CPA site. The formations comprising the Cooper Group provide a relatively shallow, regional ubiquitous base to the shallow hydrostratigraphic system in Charleston, Dorchester, and western Berkeley Counties.   Vertical hydraulic conductivity estimates for the upper clay (average of 3.4 x 10-7 cm/sec) and Ashley Formation (average of 8.6 x 10-8 cm/sec) are relatively low. These low values indicate that those units are relatively impermeable and act as aquitards where present that limit the vertical movement of groundwater.

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