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ARCADIS GERAGHTY&MILLER <br /> ' Work Plan Comments by SJCPHS <br /> SJCPHS <br /> ' Comment In paragraph 3, your letter states, "The location of the UST's <br /> operated prior to the 1967 station remodel has not been shown on <br /> site maps" <br /> ' Response Maps and reports submitted by ARCADIS Geraghty and Miller will <br /> cite, reference, and display the location of the UST's operated prior <br /> to the 1967 station remodel <br /> SJCPHS <br /> ' Comment In paragraph 4, your letter states, " the depth to groundwater at <br /> the time of the release(s)is not known" <br /> Response ARCADIS Geraghty and Miller will work with the SJCPHS, the <br /> California State Department of Water Resources (DWR), and other <br /> relevant agencies, to identify records on the elevation of, or depth <br /> ' to, shallow groundwater relevant to the site between the dates of <br /> the first installation of the UST's, or the slate of the UNOCAL's <br /> site lease, and the present <br /> SJCPHS <br /> ' Comment In paragraph 5, your letter states, "The investigation should not be <br /> limited to current dissolved-phase hydrocarbons The potential for <br /> future releases to the groundwater from contaminated soil should <br /> also be investigated by samph,ng of the soil above and below current <br /> ' groundwater until the vertical extent of sod contamination has been <br /> demonstrated " <br /> ' Response ARCADIS Geraghty and Miller respectfully disagrees with the need <br /> to, or the appropriateness of, sampling soils beneath groundwater <br /> It is our experience at many sites in numerous locations that <br /> delineation of the vertical extent of impact to groundwater can be <br /> ' a d in the work Ian <br /> accomplished using the technique describe p <br /> Further, the method indicated in the work plan will go beyond <br /> allowing the assessment of potential for future groundwater impacts <br /> from soils It will allow a real-time assessment of the actual <br /> impacts of groundwater on an ongoing basis <br /> ' Samph,ng of soils in the saturated zone will provide data on the <br /> total amount of constituents sorbed onto the soil particle surfaces <br /> ' and that which exists in the dissolved phase <br /> A quantified assessment of the future potential for groundwater <br /> ' impacts based on data provided from a saturated soil sample <br /> ' 2 <br />