The project includes the installation and operation of a soil vapor extraction (SVE) and treatment system to remediate tetrachloroethylene (PCE) (a volatile organic compound (VOC)) and other VOC breakdown products at the Site. The SVE system will collect VOC-contaminated soil vapors by applying a vacuum to subsurface soils using 46 vertical extraction wells (screened at interval depths from 5 feet to 225 feet below ground surface (bgs)) and three horizontal extraction wells (installed at 2.5 feet bgs). The treatment system will remove VOCs by adsorbing the collected soil vapors on granulated activated carbon (GAC) prior to discharging to the atmosphere. Once the SVE has run its course, post-SVE soil vapor confirmation sampling will be conducted over a period of time to document meeting remedial goals. The remediation system is anticipated to operate three years. The remediation also includes recordation of a Land Use Covenant (LUC), as necessary.
1. The project will not exceed $1 million in cost.
2. The project will be consistent with applicable State and local environmental permitting requirements including a SCAQMD permit to operate along with drilling and well permits from the San Bernardino County Environmental Health Department.
3. The project does not involve the onsite use of a hazardous waste incinerator or thermal treatment unit.
4. The project does not involve the relocation of residences or businesses.
5. The project does not involve the potential release into the air of volatile organic compounds as defined in Health and Safety Code Section 25123. The project is an in-situ SVE and treatment system which will be permitted by the SCAQMD.
6. The exceptions pursuant to California Code Regulations, Title 14 § 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 project does not involve any unusual circumstances 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 complied pursuant to Section 65962.5 of the Government Code. (https://calepa.ca.gov/sitecleanup/corteselist/).
e. Historical Resources. The project will not cause the substantial adverse change in the significance of an historical resource at the Site because there are none at the Site.