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CLEAN LAKES INC. through R -5) within the Redwood Shore Lagoon area as identified on the map above which complies with the NPDES General Permit Self Monitoring Program as submitted by the City of Redwood City. Water samples will be collected and submitted to a State Certified Laboratory, as described above, for Nitrate as N and Orthophosphate as P. Coliform Bacteria (Total Fecal, and E. coli) will be collected at two (2) sampling locations only (Sites R -1 and R -3). Turbidity samples will be collected at two (2) sampling locations only (Sites R -4 and R -5). Physical water quality parameters would be measured with a water quality probe fitted with the appropriate sensors, as outlined above, for temperature, dissolved oxygen (DO), pH, salinity, and turbidity. For quality control purposes, each field sampling event will include a duplicate sample and one field blank of distilled water kept under the same conditions as the other samples per the Redwood Shores Lagoon Management Plan protocol. Observations will also be noted for any sheen, floating materials, odors, or other unusual occurrences present. Seasonal Water Quality Testing/Monitoring will include testing, recordkeeping procedures and reporting in compliance with the Environmental Protection Agency and State of California regulatory agencies, particularly the San Francisco Bay Regional Water Quality Control Board and the State Water Resources Control Board. All services will be performed in compliance with the terms of the of Water Quality Order No. 2004 - 0009 -DWQ, Statewide General NPDES Permit for Discharge of Aquatic Pesticides for Aquatic Weed Control in the Waters of the United States, General Permits No. CAG990005, and NPDES Order 99 -059, Municipal Storm Water Permit. Task 2 — Water Quality Monitoring — Pesticide Application Monitoring: Aquatic pesticide application monitoring per Section 4.2 (NPDES General Permit Monitoring Program) will be performed under the same water quality monitoring standards outlined above (Task 1), and will include sampling as required by the current and 2011 revisions to the NPDES Aquatic Pesticide Discharge Permit. o Water quality samples will be collected via boat for 10% of herbicide applications during the months of April to October (7 months) at sample points as required in the NPDES Permit, and in accordance with the Aquatic Pesticide Application Plan (APAP) for aquatic pesticides applications prior to treatment, immediately after treatment, and within seven (7) day post application. Herbicide applications in past years appear to have typically required treatment of filamentous algae with chelated copper products and the submersed aquatic plant Widgeon Grass with a product containing the active ingredient diquat dibromide. o One of the first ten treatments (10 %) for each product applied requires sampling under the NPDES Permit, followed by one sampling event for the next 11 to 20 treatments, and so on. o Water samples would be collected in appropriate sample bottles for each active ingredient collected. o The sample collector will have an appropriate Chain of Custody identifying the active ingredient to be analyzed, including hardness in the case of chelated copper algaecide applications. o Sample labels would be attached to each sample bottle, and following collection, sample bottles would be placed in coolers holding sufficient blue ice to keep samples at 4 Celsius. 2011 Redwood Shores Lagoon Water Quality Monitoring Proposal Page 12 of 18 General Services Agreement between the City of Redwood City and Clean Lakes, Inc. - Exhibit A 07/01/2011 Page 8 of 13