This contract is for on-call water quality and hydrologic monitoring and assessment services. The contractor, Tetra Tech, Inc., will provide services as needed, including maintenance of the County's rainfall and hydrological monitoring network, assessment and QA/QC of rainfall and hydrological data, and development of data analysis tools and visualization products. The contract has a term of three years and a maximum contract amount of $6,000,000. The contractor will be paid on an hourly basis, with rates ranging from $85 to $350 per hour, depending on the type of service provided.