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May 11, 2000 California Regional Water Quality Control BoardSan Francisco Bay Region 2101 Webster Street, Suite 500 Oakland, CA 94612 Attention: Judy Huang RE: Annual Discharge Monitoring Summary Report for 1999 Dear Ms. Huang: We enclose one copy of the Annual Summary of our Discharge Monitoring Reports for the calendar year 1999, including graphical and tabular information. Compliance information and other pertinent items from previous submittals are listed under the summaries for the individual months. OVERALL PLANT PERFORMANCE Throughout the year we were able to maintain compliance with Title 22 for Restricted Use Reclamation of our total final effluent flow. However, there was reduced use of the water due to a lack of approved customers. The treatment plant remained the highest user at one million gallons per day. The Collection System Maintenance group also regularly used the water for sewer cleaning and flushing and the cleaning of wet wells in sewage lift stations. Plant performance was good for the entire year. There was one chlorine residual incident in September of a short term and quickly corrected. In November an insufficient number of Influent samples were collected during the month's final week. Numerically for the whole month there were adequate samples collected, but insufficient during the final week period. We were able to maintain reliable operation of our lift stations and to manage any failures without loss of raw sewage from the District system through the quick response of the Collection and Distribution System Maintenance Division. The Plant and Equipment Maintenance Division was able to keep all critical equipment and processes performing at levels required to enable nearly 100% compliance for the year. Biosolids treatment and disposal was in compliance with both 40 CFR, Part 503 Federal regulations for "clean" biosolids and California regulations for disposal to a Class II Landfill. All biosolids were disposed to the Ox Mountain Sanitary Landfill in Half Moon Bay, California per contract with Browning-Ferris Industries, Inc. Average solids content was 20% and all analytical results showed concentrations below disposal requirements. GRAPHIC AND TABULAR SUMMARIES Tables are included in this annual report listing all regulated compounds and the results reported from samples taken per Part B of our NPDES Permit, the self monitoring requirements. Graphical presentation is made for the common parameters of concern including Flow, Ammonia Nitrogen, CBOD, Suspended Matter and Turbidity.Judy Huang, RWQCB May 11, 2000 Page 2 I certify under penalty of perjury that this document and all attachments are prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who managed the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate and complete. I am aware that there are significant penalties for submitting false information, including the possibility of fine and imprisonment for knowing violations. {40 CFR 122.22(d)} All correspondence regarding this transmittal or other matters concerning the North San Mateo County Sanitation District, should be addressed as follows:
A copy of all such correspondence shall be sent to the plant at the following address:
Questions of a technical nature may be directed to me at (650) 991-8205, Monday through Friday, between the hours of 8:00 am and 4:30 pm. Voice mail is also available upon request. Sincerely yours, Dennis Baker Chief of Operations L00-093 Attachments
NORTH
SAN MATEO COUNTY SANITATION DISTRICT January All NPDES Permit requirements were met during the month. During the month 27 loads of dewatered, digested biosolids were hauled by Browning-Ferris Industries to the Ox Mountain Landfill in Half Moon Bay, California for disposal. The material contained 248.77 tons of dry solids and had an average analyzed density of 20.4%. February All NPDES Permit requirements were met during the month. During the month 29 loads of dewatered, digested biosolids were hauled by Browning-Ferris Industries to the Ox Mountain Landfill in Half Moon Bay, California for disposal. The material contained 209.79 tons of dry solids and had an average analyzed density of 19.30%. March All NPDES Permit requirements were met during the month. During the month 30 loads of dewatered, digested biosolids were hauled by Browning-Ferris Industries to the Ox Mountain Landfill in Half Moon Bay, California for disposal. The material contained 206.73 tons of dry solids and had an average analyzed density of 19.5%. April All NPDES Permit requirements were met during the month. During the month 29 loads of dewatered, digested biosolids were hauled by Browning-Ferris Industries to the Ox Mountain Landfill in Half Moon Bay, California for disposal. The material contained 186.64 tons of dry solids and had an average analyzed density of 18.7%. May All NPDES Permit requirements were met during the month. During the month 27 loads of dewatered, digested biosolids were hauled by Browning-Ferris Industries to the Ox Mountain Landfill in Half Moon Bay, California for disposal. The material contained 128.07 tons of dry solids and had an average analyzed density of 20.1%. June All NPDES Permit requirements were met during the month. During the month 38 loads of dewatered, digested biosolids were hauled by Browning-Ferris Industries to the Ox Mountain Landfill in Half Moon Bay, California for disposal. The material contained 213.38 tons of dry solids and had an average analyzed density of 19.4%.
July All NPDES Permit requirements were met during the month. During the month 32 loads of dewatered, digested biosolids were hauled by Browning-Ferris Industries to the Ox Mountain Landfill in Half Moon Bay, California for disposal. The material contained 163.38 tons of dry solids and had an average analyzed density of 19.4%. August All NPDES permit requirements were met for the month with the exception of a 240-minute period on August 5 when there was a failure of the sodium bisulfite feed system. This allowed a minimal chlorine residual to leave the treatment plant during that time. The peak residual was 2.8 mg/L but the majority of the time had an average residual of 0.5 mg/L. Problems with the system were corrected and there were no further occurrences during the month. During the month 27 loads of dewatered, digested biosolids were hauled by Browning-Ferris Industries to the Ox Mountain Landfill in Half Moon Bay, California for disposal. The material contained 168.30 tons of dry solids and had an average analyzed density of 21.1%. September All NPDES Permit requirements were met during the month. During the month 29 loads of dewatered, digested biosolids were hauled by Browning-Ferris Industries to the Ox Mountain Landfill in Half Moon Bay, California for disposal. The material contained 151.95 tons of dry solids and had an average analyzed density of 21.2%. October All NPDES Permit requirements were met during the month. During the month 27 loads of dewatered, digested biosolids were hauled by Browning-Ferris Industries to the Ox Mountain Landfill in Half Moon Bay, California for disposal. The material contained 137.31 tons of dry solids and had an average analyzed density of 20%. November All NPDES permit requirements were met for the month with the exception of the number of influent samples collected the last week of the month. More than sufficient samples were collected (3X/week) during the first portion of the month, but additional samples were overlooked at the end. This issue has been addressed and should not re-occur. During the month 29 loads of dewatered, digested biosolids were hauled by Browning-Ferris Industries to the Ox Mountain Landfill in Half Moon Bay, California for disposal. The material contained 154.9 tons of dry solids and had an average analyzed density of 20%.
December All NPDES Permit requirements were met during the month. During the month 29 loads of dewatered, digested biosolids were hauled by Browning-Ferris Industries to the Ox Mountain Landfill in Half Moon Bay, California for disposal. The material contained 133.7 tons of dry solids and had an average analyzed density of 19.7%. |