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q9/a� 'as wED 16 55 FAX 192593469966 ERMWEST WC a 016 <br /> 'EnvTechnical Memorandum r�.rl_dum Resounmen#al <br /> Icesci�xxces <br /> TO: jarnes Adams, Catellus Development Corporation 1777 Rotelho Drive <br /> Suite 9-60 <br /> Frons; Robin Streeter,ToxicologLst Walnut Creek,CA 94596 <br /> (925)946-0455 <br /> Date= 9 February,MW (925)946-9968(fax) <br /> Subject: Health Risk Assessment <br /> 1325 and 1515 West Weber Avenue,Stockton,CA k- 0 <br /> ERM, <br /> On behalf of Catellus Development Corporation(Catellus),Environmental <br /> Resources Maiiagentent (ERM) has prepared a health risk assessment <br /> (1IRA)for the properties located at 1325 and 1515 West Weber Avenue in <br /> Stockton,California The objective of the HRA was to assess whether <br /> residual hydtocarbon constituents in soil and ground wafter pose an <br /> unacceptable risk to human health under current and realistic future land <br /> use conditions at the subject properties This evaluation was developed ui <br /> response to a request issued on 21 December 1999 by Marty Hartzell of the <br /> Central"{Palley Regional Water Quality Control Board The methodology, <br /> results,and conclusions of the HRA are described un the following <br /> sections of#his memorandum. <br /> MEY'l ODDLOGY <br /> The approach used to develop the TURA for the 1325 and 1515 West Weber <br /> Avenue sites followed methodologies outlined by the American Society <br /> for Testing and Materials (ASTM)and described in their Standard Guule far <br /> RtA-Based C'nrrechve Action Appired at pe(rolc m Relea w Sites (E1739-95; <br /> 1996). In developing this analysis, modifications ions were made to ASTM's <br /> general procedures to incorporate applicable guidance issued by the <br /> California Environmental]Protechon Agency(Calffonua EPA) and the U S <br /> Environmental Protection Agency(OSEPA) <br /> The ASTM methodology provides a screenmig level approach that is <br /> appropriate for the evaluation of isolated or infrequent constituent <br /> detections,such as those associated with the subject properties The <br /> ASTM methodology also emphasizes the use of site-specific exposure <br /> information to identfy realistic exposure pathways and to develop risk- <br /> based scremung levels for each relevant exposure pathway Under the <br /> ASM roethodology,analytical data alae then compared to the calculated <br />