Laguna Nueva Elementary School Extended Borrow Pit Area


SCH Number
Lead Agency
Toxic Substances Control, Department of (Department of Toxic Substances Control)
Document Title
Laguna Nueva Elementary School Extended Borrow Pit Area
Document Type
NOE - Notice of Exemption

Document Description
This project involves the DTSC's approval of a RAW which will be carried out at the Laguna Nueva School Extended Borrow Pit Area. The objective of the RAW is to mitigate potential risk to human health and the environment by deed restriction, impervious cover over existing soil Cap, and Installation of an advanced methane protection System. 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. The depth of impacted soil extends ~40 ft below ground surface in some areas. The volume of impacted soil ranges approx. from 125,000 to 175,000 cubic yards, or from 190,000 to 260,000 tons. The action level for Methane is 5,000 parts per million by volume. Should methane concentrations increase to levels above the established action level, the methane detectors equipped with integrated mechanical controls will activate vent fans of the Methane Mitigation System. Similar, the methane detectors will also be programmed to trigger building evacuation alarms at higher levels of (12,500 ppmv methane), should venting be insufficient. Upon completion of the RAW, the engineering controls and LUC remedy requires long-term operation and maintenance activities. Prior to site certification, an O&M agreement between the property owner and DTSC is required to implement the O&M activities in accordancewith an approved O&M Plan under DTSC oversight. The RAW has been prepared for the Site as required by the California Health and Safety Code sections 25323.1 and 25356.1(h).

Contact Information
Angela Ortega
Department of Toxic Substances Control
Schools Evaluation and Cleanup Team 5796 Corporate Avenue
Cypress, CA 90630

Phone : (714) 484-5490


Los Angeles

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Class 30, Sec 15330
Reasons for Exemption
The project is a cleanup action; is a removal action costing less than or equal to $1 million; not located on a site which is included on any list compiled pursuant to Cal. Gov. Code Sec 65962.5; no significant effect on environment; will not result in damage to scenixc resources, including but not limited to, trees, historic buildings, rock outcroppings, or similar resources, within a highway officially designated as a state scenic highway; will not cause a substantial adverse change in the significance of a historical resource; will not require onsite use of a hazardous waste incinerator or thermal treatment unit; will not require the relocation of residences or businesses; will not involve the potential release into the air of volatile organic compounds as defined in Health and Safety Code sec 25123.6; cumulative impact of successive projects of the same type on the same place, over time, if there are any, will not be significant; will be consistent with applicable State and local environmental permitting requirements including, but not limited to: water quality standards, air quality rules such as those governing volatile organic compounds and/or active venting of methane; and approved by regulatory body with jurisdiction over the Site.
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