Removal Action Workplan, Former Quality Cleaners
Summary
SCH Number
2020070383
Public Agency
Department of Toxic Substances Control
Document Title
Removal Action Workplan, Former Quality Cleaners
Document Type
NOE - Notice of Exemption
Received
Posted
7/20/2020
Present Land Use
Commercial
Document Description
The purpose of the RAW, which constitutes the project subject to approval by DTSC, is to mitigate potential risk to human health and the environment from tetrachloroethylene (PCE, aka Dry Cleaning Fluid) in the soil, soil vapor and groundwater at the Site where a dry-cleaning facility formerly operated. The proposed remedy for the site consists of removing the floor slab within the former dry cleaning unit and installing a sub-slab depressurization (SSD) system (System). The System will prevent subsurface PCE vapors from entering the indoor air by pulling (vacuum) the vapors, which are then passed through carbon containers to remove the PCE, and the treated air is then tested before being released to the ambient air. A vapor barrier will also be installed over the top of the depressurization system and below the new slab. Installation of the vapor barrier also allows the SSD to be switched to a passive system after the highly contaminated vapors have been removed.
The proposed SSD/Vapor Barrier preferred alternative has been demonstrated to sufficiently reduce concentrations of PCE in indoor air, and to be protective of human health for commercial uses of the property. Eventually, PCE concentrations may be reduced to levels that would allow for unrestricted use of the property. Until such time as those levels are attained, a land use covenant (LUC) will be attached to the deed for the property to limit residential and other sensitive uses of the site. Current and anticipated future land use for the Site is commercial. Additionally, the groundwater will be restricted from use by a LUC.
DTSC is overseeing cleanup at the Site under a Voluntary Cleanup Agreement (VCA) signed by the project proponent and DTSC on January 9, 2017, and is proposing to approve the project pursuant to Chapter 6.8, Division 20, section 25355.5(a)(1)(C) of the Health and Safety Code (H&SC).
The proposed cleanup for the site consists of the following:
1. Removal of the floor slab within the former dry cleaning unit.
2. Next the sub-slab depressurization system will be installed. The SSD consists of a permeable gravel layer that has slotted pipes running through it. The slotted pipes are connected together and then connected to an industrial fan or blower. The purpose of the fan is to pull the PCE vapors from the permeable gravel layer and vent them through a carbon filter prior to venting to the top of the building.
3. After installation of the permeable layer and SSD system, a vapor barrier and new floor slab will be installed. The vapor barrier is a plastic like material that seals the floor and prevents PCE vapors from entering through the floor of the building.
4. After installation of the SSD/Vapor Barrier system, the indoor air will be sampled and analyzed to verify that the system is adequately preventing PCE vapors from entering the unit, and demonstrate that the unit is safe for occupancy.
A land use covenant will also be attached to the deed for the property to limit future sensitive uses of the site.
Contact Information
Name
Juanita Bacey
Agency Name
Department of Toxic Substances Control
Contact Types
Lead/Public Agency
Phone
Name
Agency Name
214 Western LLC
Contact Types
Project Applicant
Location
Cities
Petaluma
Counties
Sonoma
Cross Streets
214 Western Avenue
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
15330
Reasons for Exemption
1. The project is a minor cleanup action to be taken to prevent, minimize, stabilize, mitigate, or eliminate the release or threat of release of a hazardous waste and substance.
2. The project is a removal action costing $1 million or less.
3. The project will not be located on a site which is included on any list compiled pursuant to Cal. Gov. Code § 65962.5 (http://calepa.ca.gov/sitecleanup/corteselist/)
4. The project will not have a significant effect on the environment due to unusual circumstances.
5. The project will not result in damage to scenic resources, including but not limited to, trees, historic buildings, rock outcroppings, or similar resources, within a highway officially designated as a state scenic highway.
6. The project will not cause a substantial adverse change in the significance of a historical resource.
7. The project will not require onsite use of a hazardous waste incinerator or thermal treatment unit.
8. The project will not require the relocation of residences or businesses.
9. The project will not involve the potential release into the air of volatile organic compounds as defined in Health and Safety Code section 25123.6 (Permits for the SSD system have been obtained from BAAQMD).
10. The cumulative impact of successive projects of the same type on the same place, over time, if there are any, will not be significant.
11. The project will be consistent with applicable State and local environmental permitting requirements.
Attachments
Notice of Exemption
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