Eco Cleaners Removal Action Workplan

Summary

SCH Number
2023120703
Public Agency
Department of Toxic Substances Control
Document Title
Eco Cleaners Removal Action Workplan
Document Type
NOE - Notice of Exemption
Received
Posted
12/22/2023
Document Description
The Department of Toxic Substances Control (DTSC) approved the Eco Cleaners (Site) Removal Action Workplan (RAW) located at 4200 Chino Hills Parkway, Chino Hills. The cleanup decision document, referred to as a RAW, specified the removal action objectives, identified the contaminants of concerns (COCs), and evaluated alternative remediation proposed for the Site. The COCs at the Site consist of chlorinated volatile organic compounds (VOCs), principally tetrachloroethylene (PCE) and trichloroethylene (TCE), which are the only two VOCs detected in soil vapor that have exceeded their respective risk-based screening levels. The Project activities consist of the following: - Install four nested SVE wells with screens at two depths—one from approximately 5 to 20 feet below ground surface, and one from approximately 23 to 38 feet below ground surface. - Collect baseline (pre-SVE) soil-vapor samples for laboratory analysis from all soil-vapor and sub-slab soil-vapor probes. - Collect air flow and pressure data under different SVE well operating configurations to evaluate ow vacuum propagates in the two primary, unsaturated soil zones corresponding to the SVE well screen depths; how extraction flow rates correspond to applied SVE well head vacuum in the two primary, unsaturated soil zones corresponding to the SVE well screen depths and appropriate SVE well spacing based on vacuum propagation analysis (generally referred to as radius of influence) and pore-gas velocity analysis. -Should SVE be effective, continue operation of the SVE system for 6 to 9 months and monitor system parameters in accordance with South Coast Air Quality Management District requirements. - Collect VOC concentration data in extracted soil vapor to estimate VOC mass removal rates. - Evaluate how soil-vapor concentrations change over time (rebound) when SVE is terminated.

Contact Information

Name
Mario Cazares
Agency Name
Department of Toxic Substances Control
Job Title
Project Manager
Contact Types
Lead/Public Agency

Location

Cities
Chino Hills
Counties
San Bernardino
Regions
Southern California
Zip
91709
Other Location Info
4200 Chino Hills Parkway, Chino Hills

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Class 30, Title 14, Section 15330
Reasons for Exemption
1. Minor Actions to Prevent, Minimize, Stabilize, Mitigate or Eliminate the Release or Threat of Release of Hazardous Waste or Hazardous Substances. 2. The project will not exceed $1 million in cost. 3. The project will be consistent with applicable State and local environmental permitting requirements. 4. The project does not involve the onsite use of a hazardous waste incinerator or thermal treatment unit. 5. The project does not involve the relocation of residences or businesses. 6. The project does not involve the potential release into the air of volatile organic compounds as defined in Health and Safety Code Section 25123. (Exception: Small-scale in situ soil vapor extraction and treatment. 7. The exceptions pursuant to California Code of Regulations, Title 14, Section 15300.2 have been addressed as follows: a. Cumulative Impact. The project will not result in cumulative impacts because it is designed to be a short term final remedy that would not lead to a succession of projects of the same type in the same place over time. b. Significant Effect. The environmental safeguards and monitoring procedures that are enforceable and made a condition of project approval will prevent unusual circumstances from occurring so that there is no possibility that the project will have a significant effect on the environment. c .Scenic Highways. The project will not damage scenic resources, including but not limited to, trees, historic buildings, rock outcroppings, or similar resources, because it is not located within a highway officially designated as a state scenic highway. d. Hazardous Waste Sites. The project is not located on a site which is included on any list compiled pursuant to Section 65962.5 of the Government Code. (http://calepa.ca.gov/sitecleanup/corteselist/default.htm) e. Historical Resources. A categorical exemption shall not be used for a project which may cause a substantial adverse change in the significance of a historical resource.
County Clerk
San Bernardino

Attachments

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