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Non-Professional Services Agreement between Last Revised 3/14/2025 City of San Leandro and Synagro-WWT, LLC—Exhibit A Page 4 of 6 Contractor certifies that it has reviewed, understands, and will comply with the land application requirements identified in State Water Resources Control Board Water Quality Order No. 2004- 0012-DWQ “General Waste Discharge Requirements for the Discharge of Biosolids to Land for use as a Soil Amendment in Agricultural, Silvicultural, Horticultural, and Land Reclamation Activities (General Order - GO)”. The General Order uses the 40 CFR Part 503 requirements as baseline requirements for compliance. It provides additiona l requirements, as well as permitting and oversight. A Regional Water Quality Control Board may choose not to issue the General Order in cases where a local agency already adequately regulates the activity or if it issues a site - specific Waste Discharge Requirement (WDR) permit. Thus, the General Order may not apply to all biosolids land application practices in California, but the contractor shall determine applicability and comply with all necessary requirements of the GO or the WDR as well as any local requirements. Responsibilities and Oversight By entering into this agreement, the City acknowledges it has properly treated biosolids to meet the requirements of subparts B and D of 40 C.F.R. part 503. The City certifies that it understands all of the requirements of 40 CFR part 503 that is required of the Contractor. The City certifies that it will observe the Contractor’s operations and land application activities as appropriate. Such observations may be announced or unannounced in advance. The City will receive and review the Contractor’s land application protocols, including how application rates are set and achieved. One means of calculation the application rate (based on Wisconsin DNR Form 3400-054) is as follows (this should be close to what the Contractor calculates): a. Determine the recommended pounds per acre of Nitrogen for each crop type. b. Subtract the pounds per acre of other sources of nitrogen the farmer will apply to determine the number of pounds per acre of Nitrogen needed and to be supplied b y the biosolids. This will equal A. c. Multiply the percent dry weight of Ammonium Nitrogen (NH4) by 20 if the biosolids will be incorporated/injected or by 10 if the biosolids will be surface applied. This will equal B expressed in pounds per dry ton. d. Subtract Ammonium Nitrogen (NH4) from Total Kjeldahl Nitrogen (TKN). This will equal Organic Nitrogen expressed as a percent dry weight. e. Multiply Organic Nitrogen by 5. This will equal C expressed in pounds per dry ton, and assumes a 25% mineralization rate. f. Add B and C to calculate D. g. Divide A by D to calculate E, which is the recommended biosolids application rate expressed in dry tons per acre. h. Divide E by the biosolids percent total solids and multiply by 119. This will equal the application rate in cubic yards per acre. Documentation and Reporting The Contractor shall supply copies of transportation manifests for each load. Copies shall be submitted to the City within 30 days after disposal of biosolids and included with invoices. If the biosolids are used for land application, the Contractor shall supply information sufficient for the timely completion of EPA Annual Reports including: o Annual Operations Summary o Field Location in longitude and latitude Docusign Envelope ID: 19E78A5F-B4E6-41B2-A464-8A2BC866FFC4