Permanent GAC Contractor Installation at the Silverwood Lake Water Treatment Plant

2 Documents in Project


SCH Number
Lead Agency
Crestline Lake Arrowhead Water Agency (CLAWA)
Document Title
Permanent GAC Contractor Installation at the Silverwood Lake Water Treatment Plant
Document Type
NEG - Negative Declaration
Present Land Use
The Silverwood Lake Water Treatment Plant is a five acre area on which CLAWA maintains two aboveground reservoirs, a water clarifier, two holding tanks, sludge beds, and several control buildings.

Document Description
At the Silverwood Lake WTP site, the proposed project will include the installation of six pairs of 10 foot by 18 foot tall Granular Activated Carbon (GAC) Contractors on approximately 4,125 square feet of graded land immediately east of Backwash Holding Tank #2 within the WTP boundary. When in operation, the GAC Contractors will be serviced by one semi-truck on a monthly basis to change the internal carbon media. An additional approximately 2,500 square feet of previously graded pad area will be used as a service truck turnaround area. Additional structures to be constructed include the installation of one 50 hp and one 100 hp booster pumps and minimal lengths of pipe to connect the GAC Contractors to existing pipelines. A proposed 30 foot by 15 foot building will be constructed adjacent to the north end of the existing filter building located at the northern edge of the WTP site to house boosters and dechlorination equipment. As a part of this project, a 15 foot by 30 foot building will be added to the east side of the existing control building located west of the proposed GAC units. An existing emergency wastewater basin will be converted into a percolation bed to process additional clarifier sludge resulting from the proposed project. The bottom of the existing 0.2 acre basin will be scarified, perforated pipes will be installed, and then covered with sand and gravel to complete the conversion. The proposed project will remove precursors to Trihelomethanes (THMs) and (THMs) themselves from water within the CLAWA water delivery system. The project is proposed in response to existing Department of Health regulations involving water quality. The proposed project will improve water quality leading to compliance with water quality standards.

Contact Information
Roxanne Holmes
Crestline-Lake Arrowhead Water Agency
Lead/Public Agency
24116 Crest Forest Drive P.O. Box 3880
Crestline, CA 92325

Phone : (909) 338-1779


San Bernardino
Cross Streets
North of State Highway 138, south of Silverwood Lake
Total Acres
Appox. 5
Parcel #
State Highways
Silverwood Lake
1/4 7
Other Location Info
City: Crestline

Notice of Completion

Review Period Start
Review Period End
Development Type
Other (Filters for water treatment process)
Local Action
Land Division (Subdivision, etc.)
Project Issues
Aesthetics Air Quality Drainage/Absorption Geology/Soils Hydrology/Water Quality Noise Vegetation Wetland/Riparian Wildfire Wildlife
Reviewing Agencies
Cal Fire California Department of Health Care Services (DHCS) California Department of Transportation, District 8 (DOT) California Native American Heritage Commission (NAHC) California State Lands Commission (SLC) Department of Fish and Wildlife, Region 6 Department of Water Resources Resources Agency State Water Resources Control Board, Division of Water Quality State Water Resources Control Board, Divison of Financial Assistance California Department of Parks and Recreation California Regional Water Quality Control Board, Lahontan Victorville Region 6 (RWQCB)

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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