SITE INFORMATION AND CORRESPONDENCE

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Scott Mansholt - 4 - 21 November 2007 TAOC Tracy Pump Station site is graded and paved; a Site Management Plan (SMP) will be prepared to govern long-term management of environmental conditions at the site...the SMP will be used to address potential inhalation exposures to volatile chemicals in groundwater if site redevelopment warrants...The SMP will be recorded in an Environmental Restriction. • 2) Removal of crude oil affect soil piles may reduce/eliminate potential health risk concerns at these locations. Geomatrix response: ...the findings for the risk assessment demonstrate that constituents detected in soil do not pose a significant risk or hazard. The risk assessment is based on the premise that soil stockpiles will be distributed and graded across the site and that future receptors could potentially come in contact with this soil. • 3) A well survey should be conducted to obtain information of groundwater production wells... Geomatrix response: ...A well survey is in progress and will be submitted under separate cover(was included with the 28 September 2007 NFA Request report). According to the NFA Request..."the City of Tracy General Plan map shows the site is zoned as medium density residential, but this zoning allows for end uses other than residential development"...and that..."a deed restriction will be placed on the site to ensure that site reuse restrictions are documented." Regional Water Board staff reviewed the Geomatrix 30 April 2007 response to our 16 January 2007 HHRA review and comments to Chevron. Based on review of the April 2007 letter, we concurred in our 12 June 2007 response to Chevron, that OEHHA's comments and our request for clarification had been adequately addressed and no further action or investigations were required. Ecological Screening Evaluation In accordance with the NFA request, Geomatrix reviewed the September 2007 California Department of Fish and Game Natural Diversity Database for the Tracy quadrangle. No endangered, threatened, or sensitive species identified by state or federal agencies were located within a one-half mile radius of the site; thus, no ecological risks were identified or evaluated. Based on our review we have the following comments: • A site specific Soil Management Plan (SMP) needs to be submitted n the event petroleum affected soil is encountered during excavation activities associated with future development of the site. The SMP will serve as a guideline for Chevron to implement for the handling, reuse, and disposal of any soil affected by the degraded crude oil that may be encountered or excavated during site development. Additionally, the SMP needs to outline detailed procedures for future property owners and/or developers to follow addressing such topics as dewatering from excavations, health and safety guidelines, and include contact telephone numbers for Chevron and San Joaquin County Department of Environmental Resources.