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1 t f Ilf I Califomia Envlronmental P(otedlon Aaencv Department of To)dc Substances Control CALIFORNIA ENVIRONMENTAL QUALITY ACT NOTICE OF EXEMPTION To: Office of Planning and Research From: Department of Toxic Substances Control State Clearinghouse Cleanup Program—San Joaquin&Legacy Landfills P.O. Box 3044 Office 1400 Tenth St., Room 212 1515 Tollhouse Rd. Sacramento, CA 95812-3044 Clovis, CA 93611 Proiect Title: Human Health Risk Assessment/Feasibility Study/Removal Action Workplan for the former Lodi Manufactured Gas Plant Proiect Location:The project is located at 712 South Sacramento Street in Lodi, San Joaquin County Proiect Description: Approval of a Human Health Risk Assessment/Feasibility Study/Removal Action Workplan (document) by the Department of Toxic Substances Control(DISC)pursuant to Health&.Safety Code, chapter 6.8 as submitted on April 19, 2011 by Stantec. The document focuses on excavation and removal of contaminated soils to mitigate soil impacted with excessive levels of polycyclic aromatic hydrocarbons, metals (primarily lead that is co-mingled with other contaminants at the site)and volatile organic compounds. The purpose of the project is to mitigate impacted soils that exceed the project-specific human health risk-criteria to minimize human exposure to the identified chemicals of concern(COCs). The estimated volume of impacted soils is approximately 5,800 cubic yards(approximately 8,800 tons). The risk-based cleanup levels for these CDCs may be found in Section 3.4 of the document,which is presented as Table 1 of this document. The target cleanup goals are chemical-specific concentrations that correspond to the lower end of the 1 x10$to 1x10" range and a hazard quotient of less than 1,0. The goal of the removal action is to return the site to unrestricted use. Target cleanup goals for carcinogenic polycyclic aromatic hydrocarbons are below ambient concentrations for the area, as established by DTSC. Project activities will commence in approximately June 2012 and are expected to take approximately four months to complete. Specific environmental safeguards and monitoring procedures that are enforceable and made a condition of project approval to ensure that impacts to the environment will be less than significant are to.be included in an approved Excavation Plan, Engineering Evaluation/Cost Analysis, Health and Safety Plan, Quality Assurance Project Plan, Transportation Plan, and Air Monitoring and Dust Control Plan. In addition, In the event resources of biological, cultural, or historical significance are found in the course of project activities,work will be suspended while a qualified biological, cultural, or historical resources specialist makes an assessment of the area and arrangements are made to protect or preserve any resources that are located. If human remains are discovered at the Site, no further disturbance will occur in the location where the remains are found, and the County Coroner will be notified pursuant to Health and Safety Code section 7050.5. The Coroner will determine disposition within 48-hours(Public Resources Code, section 5097.98). Air Monitoring: Air monitoring will be conducted throughout`the remediation project. Air monitoring will consist of real-time data collection for particulates and organic vapors as well as laboratory analysis of samples collected from perimeter high-volume sampling stations. Air monitoring data will be used to determine when engineering controls are required to prevent unacceptable dust and/or organic vapor levels. If engineering controls are not able to sustain acceptable levels in worker areas or at the site perimeter,work will be suspended until conditions improve. Dust Control: This project involves air emissions,which DTSC has determined are below the San Joaquin Unified Air Pollution Control District threshold levels. An analysis of project activities upon existing environmental conditions indicates that implementation of environmental safeguards and monitoring 1 DTSC 1332 VCP NOE June 21,2012 Office of Planning&Environmental Analysis