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NJ A T T R F N F R G Y L RIVERSIDE PUBLIC UTILITIES .�19& Board Memorandum P U B L I C U T I L I T I E S BOARD OF PUBLIC UTILITIES DATE: SEPTEMBER 24, 2018 ITEM NO: 7 SUBJECT: WELL RELOCATION AGREEMENT TWIN BUTTES 6 MONITORING WELL RELOCATION BETWEEN CITY OF RIVERSIDE AND LBA RV -COMPANY XI, LP ISSUE: Recommend that City Council approve the Well Relocation Agreement between the City of Riverside and LBA RV -Company XI, LP for the Twin Buttes 6 Monitoring Well. RECOMMENDATION: That the Board of Public Utilities recommend that City Council approve the Well Relocation Agreement between the City of Riverside and LBA RV -Company XI, LP for the Twin Buttes 6 Monitoring Well. BACKGROUND: In 1967, Riverside Public Utilities (RPU) took over ownership of the Twin Buttes Water Company and with it all facilities, water rights, and easements. The Twin Buttes 6 Well is located in the City of Colton, between the Santa Ana River and Agua Mansa Road overlying the Riverside North Basin. Through acquisition of the Twin Buttes Water Company, RPU obtained the Twin Buttes 6 Well; however, the land upon which the well is located remained privately held. The Twin Buttes 6 Well was drilled in 1962 and was historically used as an irrigation well to provide water to the La Sierra area through the West Riverside Canal and Twin Buttes Canal. Use of these facilities ceased sometime between 1970 to 1980. Between the period from 1980 to the early 2000's, the well was occasionally used by the overlying property owner and was eventually idled in 2004. Other than use by the Twin Buttes Water Company, RPU had never utilized the Twin Buttes 6 well due to its location in the northwest area of the basin. In 2008, RPU implemented a groundwater monitoring program in response to the discovery of a fast moving perchlorate plume in the Rialto -Colton Basin. The Twin Buttes 6 Well was identified as an important well in the monitoring program; however, due to the well's design and condition, staff were unable to routinely collect water samples from the well, and eventually only routine water level measurements were measured from this well. In 2015, a developer acquired the property upon which Twin Buttes 6 Well is located and began grading operations to develop a distribution center. At that time, the Twin Buttes 6 Well was located just outside of the footprint of the proposed distribution center. Shortly after, grading activities at the site ceased. In 2017, staff identified that activity had resumed and re-engaged with the developer who had begun construction of the distribution center which had the Twin Buttes 6 Well located outside the proposed building footprint within a parking area. Page 31