On-Call Hydrogeological Services

The City of Pasadena Water & Power Department seeks qualified hydrogeological services firms to provide on-call professional consulting services on an as-needed basis to supplement existing Water Division resources. Services will support various water utility capital improvement and maintenance projects for PWP, a municipally-owned utility serving over 35,000 connections across Pasadena, unincorporated Altadena, East Pasadena, and Los Angeles County.

PWP operates an extensive water system including approximately 500 miles of pipeline (2-42 inches in diameter), 23 pressure zones, 14 storage reservoirs (110 million gallons total capacity), 21 booster pump stations, 27 inter-agency connections, and 18 groundwater wells (10 currently active, 2 under construction). The utility sources water from the Raymond Basin (adjudicated annual entitlement of 9,200 acre-feet) and imports nearly 16,000 acre-feet annually from the Metropolitan Water District of Southern California. PWP recharges groundwater through spreading basins in Arroyo Seco Canyon and Eaton Canyon, with maximum diversion rates of 25 cubic feet per second and 8.90 cfs respectively. Approximately 15 percent of total groundwater production comes from the recharge program.

Water quality challenges exist in several wells, with contamination from nitrate, perchlorate, 1,2,3-Trichloropropane (1,2,3-TCP), and volatile organic compounds (VOCs). Impacted wells are either blended or treated to meet maximum contaminant level standards. PWP reports well water elevations and production amounts to the Raymond Basin Management Board, which maintains a groundwater flow model based on a 2004 Baseline Groundwater Assessment. Current projects under evaluation include new well design and construction to replace older inactive wells.

Key dates: Q&A Deadline is July 23, 2024 at 11:00 PM. Proposal Deadline is August 5, 2024 at 7:00 PM. This is a Competitive Selection RFP under PMC 4.08.047 framework establishing master services contracts for on-call engagement as projects arise.