Laserfiche WebLink
49/02 '00 WED 15 45 FAX 19259469988 ERMST WC I&D18 <br /> Technical Memorandum Enviraximental <br /> � Resources <br /> Management <br /> To; James Adams,Catellus Development Corporation 1777 Botelho Drive <br /> suite 260 <br /> From: Robin Streeter,Toxicologist walnut Creek,CA 94596 <br /> (925)94&.0455 <br /> Date: 3 February,2QOQ (925)446-9%8(fax) <br /> Subject: Health Risk Assessment <br /> LI <br /> 1325 and 1515 West Weber Avenue,Stockton,CA <br /> i <br /> ERM, <br /> On behalf of Catellus.Development Corporation (Catellus),Environmental <br /> Resources Management(ERM)has prepared a health risk assessment <br /> (HRA)for the properties located at 1325 and 1515 West Weber Avenue in <br /> Stockton,California The objective of the NRAwasto assess whether <br /> residual hydxcK�arbon constituents in soil and ground water 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 in <br /> response to a request issued on 21 December 1999 by Marty Hartzell of the <br /> Central Valley Regional Water Quality Control Board The methodology, <br /> xesults,and conclusions of the HIAA are described in the following <br /> sections of this memorandum <br /> A METHODOLOGY <br /> The approach used to develop the HRA for the 1325 and 1515 West Weir <br /> Avenue sites followed methodologies outlined by the American Society <br /> for Testing and Materials(ASTM) and described m their Standard Guide for <br /> Risk-Based Corrective Action Applied at Petroleum Release Sites (E1739-95, <br /> 1936) In developing this analysis,modifications were made to ASTM's <br /> general procedures to incorporate applicable guidance issued by the <br /> California Environmental Protection Agency (California EPA)and the U S <br /> Environmental Protection Agency(USEPA) <br /> The ASTM methodology provides a screening level approach that is <br /> appropriate for the evaluation of isolated or mfrecluent constituent <br /> detections,such as those associated wAh the subject properties The <br /> ASTM[methodology also emphasizes the use of sine-specific exposure <br /> .information to identify realistic exposure pathways and to develop risk- <br /> based screening levels for each relevant exposure pathway Under the <br /> ASTM methodology,analytical data are then compared to the calculated <br />