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Review of the Revised Response to Comments on the <br /> Draft OU 2 Human Health Risk Assessment <br /> DDJC Sharpe Site <br /> Lathrop, California <br /> December 2006 <br /> REVIEW OF RESPONSE TO GENERAL COMMENTS <br /> Review of Response to General Comment 1: The response to this comment appears to be <br /> adequate. The response indicates that the requested information, including figures and analytical <br /> results associated with previous characterization and/or confirmation studies will be included in <br /> the revised sampling and analysis plan (SAP) and, hence, be made available to EPA. <br /> Review of Response to General Comment 2: Based on the assumption that the supporting <br /> figure and text will be included in the revised SAP and made available to EPA for review, the <br /> response to this comment appears to be adequate. <br /> Review of Response to General Comment 3: The response to this comment appears to be <br /> adequately addressed. As requested in the response, the specific methodologies that will be <br /> employed in estimating bulk soil concentrations have been outlined. That is, the response <br /> specifically indicates the use of the Johnson and Ettinger vapor intrusion model to estimate <br /> indoor air concentrations. Also, the response depicts the actual equation that will be used to <br /> estimate volatile organic compounds (VOCs) in bulk soil and outdoor air. <br /> Review of Response to General Comment 4: Assuming that the trespasser youth scenario will <br /> be added as a potential receptor in a revised conceptual site model, the response to this comment <br /> is adequate. <br /> REVIEW OF RESPONSE TO SPECIFIC COMMENTS <br /> Review of Response to Specific Comment 1 (Section 1.4, paragraph 1.4.2, page 1-2) <br /> Summary of Pertinent Site Data: With the understanding that the revised SAP will include the <br /> previously requested Appendix B data, including figures and text, the response to this comment <br /> appears to be adequate. <br /> Review of Response to Specific Comment 2 (Section 1.4, paragraph 1.4.2, page 1-2) <br /> Summary of Pertinent Site Data: The response to this comment appears to be adequate. <br /> However, since the principal objective of the SAP is to ensure that sampling data collection <br /> activities will be congruent with previous data collection activities performed at the site, <br /> sufficient information to ascertain whether the SAP is concordant with previous site <br /> investigations and/or sampling events should be provided. <br />