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CITY COUNCIL AGENDA ITEM NO. 8

Meeting Date: December 13, 2005

Subject/Title: Adopt a Resolution establishing local limits as required by City of Brentwood Municipal Code section 13.04.115A.

Prepared by: David Stoops, Wastewater Operations Manager

Submitted by: Paul Zolfarelli, Director of Public Works

RECOMMENDATION
Adopt a Resolution establishing local limits as required by City of Brentwood Municipal Code section 13.04.115A.

PREVIOUS ACTION
On August 23, 2005, the City Council adopted Sewer System Ordinance No. 808 that revised, among other things, Chapter 13.04 of the City of Brentwood Municipal Code, including section 13.04.115A.

BACKGROUND
The City of Brentwood’s Wastewater Treatment Plant treats over three million gallons per day (MGD) of wastewater for discharge into Marsh Creek and for beneficial re-use. Currently, this discharge meets and in some cases exceeds strict Federal and State water quality discharge standards set forth in the City’s National Pollution Discharge Elimination System Permit (NPDES) issued by the California Regional Water Quality Control Board. The California Regional Water Quality Control Board has required the City of Brentwood to implement a Pretreatment Program that meets Environmental Protection Agency (EPA) and State requirements based on 40 CFR § 403.8. Pretreatment programs are designed to remove pollutants not normally removed through a biological treatment plant prior to discharge into the City owned sewer system.

One of the key elements of the City’s Sewer System Ordinance, codified as Chapter 13.04 of the Brentwood Municipal Code, is to establish local limits, which sets the maximum measurable level of pollutants that a commercial/industrial user can discharge into the City’s sewer system. These local limits will be used by City staff when issuing commercial/industrial permits that will 1) protect the operation of the treatment plant, 2) maintain or improve the quality of the biosolids produced, and 3) protect the water quality of the receiving water, Marsh Creek. Additionally, these local limits will be used in any legal action taken upon a person(s) or commercial/industrial user that knowingly allows the discharge of a pollutant(s) that is equal to or greater than established by the attached local limit Resolution.

Staff contracted the services of Raines, Melton & Carella, Inc. to develop technically based local limits for section 13.04.115A. Attached is the technical memorandum detailing the methods used to determine technically based local limits. These local limits will help the City regulate future discharges and assist City staff in proactively and effectively treat pollutant loads. Local limits are in some cases more stringent than federally mandated discharge limits, however when a new federally mandated limit is adopted or a current limit is stricter than the City’s current local limit the federally mandated limit will supersede.
FISCAL IMPACT
There are currently no initial costs associated with the passage of this Resolution. No funds are needed for implementation. If an illegal discharge has been identified, additional resources and costs may be required if taking legal action.

Attachments:
• Resolution
• Brentwood Municipal Code section 13.04.115A
• Technical Memorandum

RESOLUTION NO.___

A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF BRENTWOOD ESTABLISHING LOCAL LIMITS AS REQUIRED BY CITY OF BRENTWOOD MUNICIPAL CODE SECTION 13.04.115A.

WHEREAS, the Regional Water Quality Control Board has required the City to implement a Pretreatment Program that meets EPA and State requirements based on 40 CFR § 403.8; and

WHEREAS, the City of Brentwood treats residential and industrial sewage; and

WHEREAS, local limits will be used by City staff when issuing commercial/industrial permits that will protect the operation of the treatment plant, maintain or improve the quality of the biosolids produced, and protect the water quality of the receiving water, Marsh Creek; and

WHEREAS, on August 23, 2005, City Council adopted Sewer System Ordinance No. 808 that, among other things, revised Chapter 13.04 of the Brentwood Municipal Code; and

WHEREAS, the City of Brentwood has developed technically based local limits for Code section 13.04.115A that meets current regulatory requirements.

NOW, THEREFORE BE IT RESOLVED that the City Council of the City of Brentwood establish local limits as required by Code section 13.04.115A as follows:

Local Limits City of Brentwood October 15, 2005

Pollutant Calculated Brentwood Removal % EPA Medium Proposed Brentwood Local Limit (ug/l) Technical Basis
Aluminum N/A N/A 87 Assumed 0% removal, effluent limit
Ammonia N/A N/A 6.3 (mg/l) Assumed 0% removal, effluent limit
Arsenic 23 N/A 130 23% removal, sludge limit
Barium 5 N/A 360 5% removal, effluent limit
Cadmium 52 50 60 52% removal, effluent limit
Chromium N/A 72 2,000 Lowest EPA categorical discharger limit
Copper 62 85 910 62% removal, effluent limit
Cyanide N/A 66 90 66% removal of limit, effluent limit (Basin Plan)
Lead 31 52 100 31% removal and effluent limit
Mercury 92 67 33 67% removal, effluent limit
Molybdenum N/A N/A 30 0% removal, sludge limit
Nickel 4 17 1,770 4% removal, effluent limit
Selenium 3 N/A 70 3% removal, sludge limit
Silver 61 62 350 61% removal, effluent limit
Thallium 30 N/A 6 30% removal, effluent limit
Zinc 18 78 4,000 50% removal, effluent limit (Basin Plan)
TDS N/A N/A 1,050 (mg/l) Background influent limits
E.C. N/A N/A 1,900 (umhos/cm) Background influent limits
Oil and Grease N/A N/A 10 (mg/l) 0% removal, effluent limit
BOD 99 N/A 2,200 (mg/l) 99% removal, design load in denitrification basins
TKN N/A N/A 55 (mg/l) Design load in denitrification basins
TSS 99 N/A 9,900 (mg/l) 99% removal, effluent limitations

PASSED, APPROVED AND ADOPTED by the City Council of the City of Brentwood at a regular meeting held on the 13th day of December 2005 by the following vote:
 

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