The Carpinteria Sanitary District has been and will continue to operate its critical infrastructure amid the Novel Coronavirus COVID-19 outbreak. Our primary role is to protect public health and the environment. We have implemented measures to ensure the safety of our staff and intend to continue to monitor the situation as new information is presented. Our Administration Office is open and is continuing its business, but ask that the public call or email us before coming to the office for permits or for any other District business, as we are limiting non-critical contact in accordance with guidelines from public health officials.
We also need your help. For our collection system and our treatment plant to function reliably, it is critically important that our customers do not flush any disinfectant wipes or any other wipe products, even if they are labeled “flushable”. Also, please do not flush paper towels as they do not break down and can clog sewer pipes. See the important message from the State Water Resources Control Board on this topic attached here. Thank you.
CAPP – Public Meeting on DEIR Thursday, July 18, 2019 5-7pm
NOTICE OF AVAILABILITY OF DRAFT ENVIRONMENTAL IMPACT REPORT and NOTICE OF PUBLIC MEETING
For Draft EIR documents,click here.
Carpinteria Advanced Purification Project
TO: Agencies, Organizations, and Interested Parties
DATE: July 1, 2019
PROJECT TITLE: Carpinteria Advanced Purification Project
ANTICIPATED ENVIRONMENTAL EFFECTS: Carpinteria Valley Water District (CVWD) is the lead agency under the California Environmental Quality Act (CEQA) and has prepared a Draft Environmental Impact Report (EIR) for the Carpinteria Advanced Purification Project. The EIR also complies with National Environmental Policy Act (NEPA) requirements because of potential federal funding opportunities. The purpose of the Carpinteria Advanced Purification Project is to provide a drought-proof, local source of water supply by recharging the Carpinteria Valley Groundwater Basin with purified water. The EIR addresses construction and operation of an advanced water purification facility (AWPF), pump station, conveyance pipelines, injection wells, backwash pumps and storage, monitoring wells, and associated facilities. The Draft EIR analyzes all of the resource areas mandated by CEQA. All impacts were found to be less than significant or less than significant with mitigation measures incorporated. The Study Area contains three sites identified on the Cortese List (§65962.5 of the Government Code) of hazardous waste sites.
PROJECT LOCATION: The Carpinteria Advanced Purification Project is located in the City of Carpinteria and unincorporated Santa Barbara County, California. Carpinteria is located approximately 12 miles south of the City of Santa Barbara, and approximately 80 miles north of the City of Los Angeles. As shown in Figure 1, the Proposed Project is primarily located within the City of Carpinteria’s municipal boundaries, with the exception of one potential injection well site (Well Site #6) and associated pipeline. The Project footprint covers the AWPF site at 5351 Sixth Street (co-located with the Carpinteria Sanitary District’s Wastewater Treatment Plant), an up-to-40-foot wide corridor that follows the conveyance pipelines, 10,000 square feet at each of up to three injection well sites, 5,000 square feet at each of three monitoring well sites, and the immediate area around the existing ocean outfall. The injection well sites would be located approximately 0.8 to 1.0 miles north of the AWPF. Five potential injection well sites have been identified, though only three would be selected as design continues and property rights are acquired. Conveyance pipelines between the AWPF and the injection wells would generally run within the public roadway rights-of-way (ROW). The pipeline would cross U.S. Highway 101 at the Linden Street Overpass.
PROJECT DESCRIPTION: The purpose of the Carpinteria Advanced Purification Project is to create a new drought-resistant and reliable supply of local water, produce water suitable for groundwater recharge and potable reuse, and reduce CVWD’s reliance on imported surface water and storage at Lake Cachuma. The Project is being developed in partnership with Carpinteria Sanitary District (CSD), the owner/operator of the CSD Wastewater Treatment Plant (WWTP). The Project involves construction and operation of a new advanced water purification facility, up to three new injection wells, pipelines to convey advanced treated water to the injection wells for recharge to the Carpinteria Groundwater Basin, and three monitoring wells to monitor potential changes in groundwater levels and quality. Figure 1, attached to this document, show an overview of the Proposed Project, while Figure 2 shows the proposed layout of the AWPF and associated facilities within the existing WWTP site. The proposed Project would produce approximately 1,100 acre-feet per year (AFY) (1.0 million gallons per day (MGD)) of purified water from the CSD WWTP for injection into the local groundwater basin, where it ultimately would be used for CVWD potable water supply. Existing CVWD production wells would be used to recover treated water from the groundwater basin. The ultimate project assumes an expansion from 1.0 MGD to 1.2 MGD based on projected future increases in WWTP flows. The ultimate Project includes the following facilities: • AWPF consisting of equalization tank, microfiltration, reverse osmosis, and an advanced oxidation process, to be located on the WWTP site • Purified water pump station, to be located on the WWTP site • 6,100 linear feet (LF) of 12-inch conveyance pipeline from the PWPS to a well lateral split point, including Caltrans installation for the Linden Avenue overpass over US Highway 101 • 2,000 LF of 8-inch conveyance pipeline from the well lateral split point to individual injection wells • Up to three 14-inch injection wells with backwash pumps and one 42,000 gallon tank • Either 1,400 LF of 12-inch well backwash discharge piping to existing sanitary sewers, or 600 LF of 12-inch to existing storm drain culverts. • Six monitoring wells • Modifications to the CSD WWTP ocean outfall
LEAD AGENCY: Carpinteria Valley Water District
DOCUMENT AVAILABILITY: The Draft EIR can be viewed on CVWD’s website or in print at the following locations:
- Project Website: http://cvwd.net/capp/
- Carpinteria Valley Water District Office, 1301 Santa Ynez Ave, Carpinteria, CA 93013, (805) 684-2816, Open 8 a.m. to 5 p.m. Monday-Friday.
- Carpinteria Sanitary District Office, 5300 Sixth Street, Carpinteria, CA 93013, (805) 684- 7214, Open 8 a.m. to 5 p.m. Monday-Friday.
- Carpinteria Library, 5141 Carpinteria Avenue, Carpinteria, CA 93013, (805) 684-4314, Open 10 a.m. to 7 p.m. Monday and Wednesday, 10 a.m. to 5:30 p.m. Tuesday, Thursday, Friday, and 10 a.m. to 5 p.m. Saturday.
PUBLIC REVIEW PERIOD: July 1 to August 30, 2019
PUBLIC MEETING: CVWD will hold one public meeting to receive comments on the Draft EIR and provide information about the proposed Project. The public meeting is scheduled as follows:
Date/Time: Thursday, July 18, 2019 5:00 p.m. to 7:00 p.m.
Location: Carpinteria Library – Arts and Lecture Room 5141 Carpinteria Avenue Carpinteria, CA 93013
CONTACT: All comments should be submitted in writing by August 30, 2019 to: Email: email@example.com Mail: Mr. Robert McDonald Carpinteria Valley Water District 1301 Santa Ynez Ave. Carpinteria, CA 93013 Phone: (805) 263-4826
It only happens when it rains
As they say, when it rains it pours. On Friday, Feb. 17 it poured in Carpinteria. Nearly 4.5 inches of rain fell during a 24-hour period, more than I’ve seen in any single day since my job made me start paying attention to such things.
Of course, with the prolonged drought, we need the rain badly and this deluge allowed our local water purveyors to breathe a small sigh of relief. For wastewater agencies, however, intense rainfall events like this one can end up in the category of “too much of a good thing.”
Infiltration and inflow, or I&I, is an industry term that refers to storm water or shallow groundwater that enters the sewer collection system during and immediately following a rain event. In the wastewater business, I&I is bad.
There are several ways that rainwater gets into the sewer system. Surface flooding can inundate sewer manholes allowing water to enter the system through vent holes in cast iron manhole lids. When soils are saturated, rainwater can infiltrate the sewer system through cracks in underground manholes, sewer mains and sewer laterals. Finally, and most significantly, storm water can enter the sewer system through the illicit connection of roof drains, yard drains and other surface drains.
No doubt all of these sources of I&I came into play on Feb. 17. Flows into the wastewater treatment plant were over three times higher than normal—we treated 3.4 million gallons as compared to just over a million gallons on a normal day. Fortunately, the treatment facility has the hydraulic capacity to handle these abnormal events, but pumping and treatment costs are dramatically affected by I&I.
I&I presents an even bigger problem in the sewer collection system. The District has seven pump stations, located throughout Carpinteria, that convey wastewater to the treatment facility. These pump stations, and the network of sewer pipelines throughout our service area, are not designed to handle tremendous amounts of storm water inflow. Flows at some of our remote pump stations during this event were four or five times higher than normal, requiring District staff to mobilize emergency auxiliary pumps in order to keep up with incoming flows. Even with our pre-storm preparations, a major effort was required throughout the day to avoid sewer spills or overflows that would have otherwise resulted from excessive I&I.
Sewer spills are serious—they can affect water quality, threaten public health and result in major fines or penalties. Much of our focus at the District is on maintaining and improving our sewer collection system to avoid spills and overflows. We have an ongoing program to rehabilitate or replace pipelines and manholes, eliminating sources of I&I, but to really be effective we need help from our customers.
First and foremost, make sure that your roof drains, downspouts, yard drains or other surface drains are not connected to the sanitary sewer. District staff members are available to help verify this or to investigate any storm drains that may be inadvertently connected to the public sewer system. Second, consider having your lateral sewer—the pipe between your home and the street—inspected to make sure there are no cracks or breaks or other defects that would contribute to I&I. There are several local plumbers who are able to assist homeowners with video pipeline inspections and any required repairs. Your help on these fronts is greatly appreciated.
I know we are all hoping for a few more rainstorms this season to fill our reservoirs and replenish our groundwater resources. Personally, I’m hoping it comes in smaller doses, but we will be ready no matter what.
Aeration Blower Replacement Project
AERATION BLOWER REPLACEMENT PROJECT
A key part of municipal wastewater treatment is a biological process, referred to as secondary treatment. High volume blowers are used to feed air into large tanks in order to provide optimal conditions for biological growth and treatment. These aeration blowers use a great deal of electricity – energy demand from this equipment has a very high associated cost each and every month.
The District is now undertaking a project to replace two existing 150 horsepower centrifugal blowers, which have been in service since 1993, with new 75 horsepower high speed turbo blowers. This is a relatively new type of aeration blower that operates with a wider range of air flow and can be controlled to match the precise oxygen demand within the process tanks. The result will be very significant reduction in energy use
Based on a comprehensive technical evaluation, the District selected turbo blowers manufactured by APG Neuros. Accurate dissolved oxygen monitoring equipment and automated valves will be used to control delivery of air to the aeration basins and maintain. Once the project is complete, the District expects to realize an annual energy savings of approximately thirty percent. The project cost will also be offset by an energy efficiency rebate from Southern California Edison.
Wastewater Treatment Facilities Tour
Wastewater entering the plant is pumped up so that it can flow through the treatment process and out the outfall pipe entirely by gravity.
Screening and Grit Removal
A self-cleaning mechanical bar screen removes rags, floatable debris and other oversize material. A cyclone grit separator then removes sand, gravel, egg shells and other non-organic components of the incoming wastewater. Screenings and grit are disposed of in a permitted sanitary landfill.
The primary clarifier is a large settling tank used to separate solid matter from the liquid wastestream. Solids are removed and pumped to the aerobic digester for further processing. Floatable components, such as grease, are also removed and collected in the primary clarifier. The tank is covered to contain and control any odors that may be generated.
This process, generally referred to as “secondary treatment”, consists of two parallel tanks in which the conditions for biological treatment are optimized through addition of air. The tanks contain hundreds of millions of actively growing single-celled microorganisms (mostly bacteria, but also protozoa, fungi, and others) which consume the bacteria in the wastewater. The District’s aeration basins are normally operated in “extended aeration” mode which allows for conversion of ammonia to non-toxic forms of nitrogen.
Effluent from the aeration basins flows to the secondary clarifiers, which are large settling tanks used to separate solids from liquid wastestream. Clear water flows over weirs and is directed to the disinfection process.
Sodium hypochlorite, which is liquid bleach, is used to kill residual bacteria prior to discharge. The chemical is injected at the head of the chlorine contact tank and allowed to react for at least two hours. Sodium bisulfite is used to remove any remaining chlorine prior to ocean discharge.
The fully treated effluent is discharged to the Pacific Ocean via an outfall pipe that is approximately 1,000 feet long. The pipe has diffuser ports near its terminal end to evenly distribute the flow. The District regularly monitors the ocean near the outfall and the surf zone to ensure that the environment and public health are being protected. The outfall is inspected and videotaped annually by divers to assure it is functioning safely.