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Mr. Dean Hubbard <br /> California Regional Water Quality Control Board <br /> February 17, 2006 <br /> Page 3 <br /> 5) Finally, you noted that OEHHA has recently requested electronic versions of the risk <br /> calculations for their review of other HHRAs. Because the spreadsheets that were used for <br /> the HHRA calculations were developed by Geomatrix for exclusive use by Geomatrix staff, <br /> we prefer not to distribute them electronically. Hard copies of the spreadsheets are included <br /> in the HHRA and the equations used to calculate the output are also presented. It should be <br /> straightforward for OEHHA check the calculations imbedded in the spreadsheets. <br /> Geomatrix will be happy to answer any questions regarding the calculations that OEHHA <br /> may have. <br /> We appreciate your thorough review of the HHRA and hope that the additional information <br /> provided herein addresses your questions. Based on our telephone conversations, we understand <br /> that you intend to submit the HHRA along with this letter and enclosures to OEHHA. Please call <br /> either Scott Mansholt of CEMC (925-842-1804) or Jim Levy of UPRR (916-789-5528) if you <br /> need further information. <br /> Sincerely yours, <br /> GEOMATRIX CONSULTANTS, INC. <br /> ryan Turner, PG#7807 Gary R. Foote, PG#5044 <br /> Project Geologist Principal Geologist <br /> MG/GRF/Idu <br /> Enclosures: Revised Page 6 of the Human Health Risk Assessment <br /> Geomatrix, 2003, Soil Investigation and Groundwater Monitoring Report, <br /> TAOC Tracy Pump Station, Tracy, California, December 16. <br /> cc: Scott Mansholt, Chevron Environmental Management Company (letter only) <br /> Jim Levy, Union Pacific Railroad (letter only) <br /> Mike Infurna, San Joaquin County Environmental Health Department (letter only) <br /> 1:\Project\7000s\7065\Risk\Letter_02_06.doc <br />