Monk Hill Treatment System, Conditional Use Permit #5057

2 Documents in Project


SCH Number
Lead Agency
City of Pasadena
Document Title
Monk Hill Treatment System, Conditional Use Permit #5057
Document Type
MND - Mitigated Negative Declaration
Present Land Use
Water Reservoir / Public and Semi-Public (PS) / Institutional

Document Description
The applicant, Pasadena Water and Power, has filed a Conditional Use Permit application to allow for the construction, installation, and operation of an ion exchange (IX) and a liquid granular activated carbon (LGAC) treatment system to treat groundwater from the four water supply wells; Arroyo Well, Well 52, Ventura Well, and Windsor Well of the Monk Hill Wells. Groundwater extracted from these wells will be treated using IX to remove perchlorate, LGAC to remove volatile organic compounds (VOCs), and will be disinfected with gas chlorine plus ammonium hydroxide prior to storing in the Windsor Reservoir for distribution. The proposed treatment technology is approved by the Department of Public Health (DPH) and used at numerous locations in Southern California for drinking water application. A Conditional Use Permit is required to allow the expansion of a major utility.

Contact Information
Lanny Woo
City of Pasadena
Lead/Public Agency
175 North Garfield Avenue
Pasadena, CA 91001

Phone : (626) 744-6776


34°11'"N 118°10'"W
Los Angeles
Cross Streets
East side of Windsor, just north of Windsor Avenue/Lehigh Street/Kent Street intersection
Total Acres
Parcel #
5823-022-900; 5823-028-901, 271
State Highways
Foothill Freeway (210)
Five Acres "The Boys and Girls Aid Society"
Arroyo Seco
Other Location Info
City/Nearest Community: Altadena

Notice of Completion

Review Period Start
Review Period End
Development Type
Other (Groundwater Treatment Facility)
Local Action
Use Permit
Project Issues
Aesthetics Biological Resources Hazards & Hazardous Materials Hydrology/Water Quality Noise Transportation Mandatory Findings of Significance
Reviewing Agencies
California Department of Conservation (DOC) California Department of Fish and Wildlife, South Coast Region 5 (CDFW) California Department of Health Care Services (DHCS) California Department of Parks and Recreation California Department of Transportation, District 7 (DOT) California Highway Patrol California Native American Heritage Commission (NAHC) California Regional Water Quality Control Board, Los Angeles Region 4 (RWQCB) Department of Toxic Substances Control Department of Water Resources Resources Agency State Water Resources Control Board, Division of Water Rights State Water Resources Control Board, Divison of Financial Assistance

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at or via phone at (916) 445-0613.

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