City Hall, 505 S. Garey Ave., Pomona, CA 91766, (909) 620-2311 POMONA
Water Resources Department
February 27, 2023
To: Agencies, Organizations, and Interested Parties
Subject:
Notice of Intent to Adopt a Mitigated Negative Declaration for the Pedley Spreading Grounds Pond Enhancements Project
The City of Pomona prepared an Initial Stu dy for the Pedley Spreading Grounds (PSG) Pond Enhancements Project. Based on the information contained in the Ini tial Study, the City of Pomona intends to adopt a Mitigated Nega tive Declaration for the project under the California Environmental Quality Act (CEQA). The City of Pomona is the CEQA Lead Agency for the project.
Project Location: Located at 1691 Longwood Avenue in the City of Claremont, California, the PSG are owned and operated by the City of Pomona (Figure 1). The project site is in Sections 3 and 34; Township 1 South and Township 1 North; Range 8 West; San Bernardino Meridian; within the United States Geological Survey (USGS) Ontario 7.5-minute topographic quadrangle. The three stormwater spreading basins (total of approximately 4 ponded acres) are bounded by single-family residences on Radcliffe Street to the north; Chaparral Elementary School and single-family residences on Longwood Avenue on the east; single family residences on Akron Place, Lowell Avenue and Longwood Avenue on the south; and open space managed by the California Botanic Garden on the west.
Project Description: The three existing basins receive flows from the adjacent (to the north) neighborhood through 42-inch and 18-inch storm drains, as well as process water from the adjacent Pedley Filtration Plant (PFP). The proposed project is a collaborative effort between the Cities of Pomona and Claremont to capture, treat, and infiltrate local urban runoff into the existing PSG to increase water supply through stormwater recharge and to decrease non-point source pollutants. The project includes: grading of the existing PSG basins to enhance percolation; modifications to an existing stormwater junction diversion structure at Baseline Road and Mills Avenue; construction of a new control vault to improve stormwater conveyance to the basins; new water quality pretreatment structure; inlet storm drain extensions; energy dissipater and riprap pads; stilling basin and equalizer structures; spillways, access ramps and roadway improvements; and PFP outlet interconnect piping and controls.
Additionally, the project includes implementation of improvements (pathway, plantings, educational signage, viewing area with benches, fencing, and a bike rack) at the Chaparral Park north of PSG.
Environmental Effects: The Initial Study describes potentially significant impacts of the proposed project on biological resources, cultural res ources, geology and soils, water quality, noise, transportation, Tribal cultural resources, and utilitie s and service systems. Mi tigation measures have Attachment No. 2
THE CITY OF
City Hall, 505 S. Garey Ave., Pomona, CA 91766, (909) 620-2311 been defined to reduce impacts to less than significant levels. Other effects found to be less than significant are also described in the Initial Study.
Hazardous Waste Disclosure
Per Section 15072(g)(5) of the CEQA Guidelines, the proposed project is not on any of the lists enumerated under Section 65962.5 of the California Government Code.
Public Review of the Initial Study: The public review period commences on February 28, 2023 and concludes on March 30, 2023 at 5:00 pm. A copy of the Initial Study is posted at https://www.pomonaca.gov/Home/Components/News/News/106/14?locale=en. Copies of the Initial Study are also available for review at the City of Pomona offices (148 N. Huntington Street).
Public Comments: During the public review period, written comments on the Initial Study may be submitted to [email protected] or via mail to:
City of Pomona Water Resources Department
148 N. Huntington Street
Pomona, California 91768
Attn: Mr. Jorge D. Anaya
Comments must be submitted by March 30, 2023 at 5:00 pm.
If you require additional information, please contact Mr. Anaya at [email protected] or (909) 772-4240.
Sincerely,
Jorge D. Anaya
Senior Water Resources Engineer
cc: Chris Diggs, Water Resources Director
Julie Carver, Environmental Compliance Supervisor
Jorge Anaya
V:\1858\Active\184031542_PedleySpreadingGrounds\03_data\gis\BRTR_FIgure1_ProjectLocationMap_20220621.mxd Revised: 2022-07-05 By: Dalaw 1 184031542
City of Pomona
Pedley Spreading Grounds Pond Enhancements Project
Claremont
Los Angeles County, California
Prepared by DL on 2022-06-21
TR by SET on 2022-06-21
IR by JV on 2022-06-21
Project Location
Disclaimer: This document has been prepared based on information provided by others as cited in the Notes section. Stantec has not verified the accuracy and/or completeness of this information and shall not be responsible for any errors or omissions which may be incorporated herein as a result. Stantec assumes no responsibility for data supplied in electronic format, and the recipient accepts full responsibility for verifying the accuracy and completeness of the data.
Notes
1. Coordinate System: NAD 1983 StatePlane California V FIPS 0405 Feet
2. Data Sources: Stantec 2022.
3. Background: Sources: Esri, GEBCO, NOAA, National Geographic, Garmin, HERE, Geonames.org, and other contributors Sources: Esri, HERE, Garmin, USGS, Intermap, INCREMENT P, NRCan, Esri Japan, METI, Esri China (Hong Kong), Esri Korea, Esri (Thailand), NGCC, (c) OpenStreetMap contributors, and the GIS User Community
Esri, Garmin, GEBCO, NOAA NGDC, and other contributors
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