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ARCADIS BBL Mr. Brian Taylor <br /> July 27, 2007 <br /> estimates of the potential vapor source strength. As such, this evaluation will tend to <br /> over predict risks and hazards. <br /> Conclusions <br /> Using the approach described in this evaluation, the estimated excess lifetime cancer <br /> risks for onsite workers in the office building at the Chevron Bulk Fuel Terminal No. <br /> 1001621 do not exceed the established acceptable risk range, from 1 x 10$to 1 x 10' <br /> ", as defined by Cal-EPA, USEPA and other regulatory agencies. In addition, the <br /> estimated hazard index for workers in the onsite building is also below an acceptable <br /> level, of 1.0,for noncancer effects. Moreover, none of the maximum COPC <br /> concentrations detected in groundwater monitoring wells beneath the onsite office <br /> building exceed Cal-EPA ESLs for the evaluation of potential vapor intrusion <br /> concerns. These results indicate that potential health risks for onsite occupants of the <br /> office building exposed to potential vapors migrating from chemicals collected in <br /> groundwater beneath the building are below levels of concern. <br /> If you have any questions or comments regarding the contents of this report, please <br /> contact Michele Amaral by telephone at 707.776.0865 extension 18 or by e-mail at <br /> michele.amaral@arcadis-us.com, or David Evans by telephone at 916.857.0124 ext. RpFESsl0 <br /> 226 or by e-mail at david.evans@arcadis-us.com. P Nq <br /> FLf�Sc�F2 <br /> Sincerely, USP ym m <br /> 5705 <br /> ARCADIS U.S., Inc. �EXP. 69/'r3�Zme <br /> d`T CIV1l <br /> �TFOF CAI�T;.� <br /> Michele E.Amaral Michael P. leischner, P.E. <br /> Senior Toxicologist Principal Engineer <br /> Attachments <br /> Copies: <br /> Ms. Nishi Nijhawan, Chevron Environmental Management Company <br /> Ms. Stephanie Furgal, Chevron Environmental Management Company <br /> Mr. David Barnes, Chevron Products Company <br /> Mr.Willie Ramsey, Chevron Products Company <br /> Mr. Sheldon Nelson, Chevron Research and Technology <br /> Mr. Michael Infurna, San Joaquin County Environmental Health Department <br /> Mr. Lee Helms, Stockton, California <br /> Page: <br /> GYMV IIWOWTIO%011 OOIit11�llxleBCA EnIueAen..roe 6/7 <br />