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S _@ <br /> I <br /> Q <br /> 3555 Hammer <br /> Page 2 oft <br /> .i <br /> t <br /> as soon as possible. A work plan showing the cost-effective comparison of at least two 1 <br /> i <br /> different remediation methods must be submitted to PHS/EHD. If attenuation i <br /> resent � sto be <br /> presented as a remediation <br /> method <br /> then supportive data will be required as outlined in <br /> EPA document 510-B-94-003 entitled "How To Evaluate Alternative Cleanup <br /> Technologies For Underground Storage Tank Sites" (see Exhibit DX-4 monitoring <br /> parameters for attenuation). Guidelines in the EPA document must be followed for soil <br /> vapor extraction and air sparging remediation methods as well. <br /> t, A work plan to define the lateral and vertical extent of groundwater contamination and <br /> propose two different cost-effective remediation methods at this site must be submitted to <br /> PHS/EHD by January 31 2001 <br /> Contact Carol Oz, Senior REHS at (209) 468-3440 or Dot Lofstrom at (209) 468-3436 if <br /> you have further questions regarding this letter. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Carol Oz; Senior REHS Dot Lofstrom,R.G. <br /> Site Mitigation Unit N Unit IV Geologist <br /> cc: Marty Hartzell-CVRWQCB <br /> James Lehrman-ATC <br /> i <br /> i <br /> ,I <br />