SR 06:290 - Laserfiche WebLink

Based upon the SMP recommendations above, the Zone 7 Board has taken formal action to offset the past (1998) salt buildup of 2,200 tons per year plus approximately 200 tons per year projected thereafter. Their action also stated a goal of "providing comparable delivered water quality to all retailers". In conjunction with this action Zone 7 began increasing conjunctive use of the groundwater basin in 1999 by increased pumping of groundwater from their wells located in Pleasanton. This action alone, without wellhead demineralization, further degrades delivered water quality for both DSRSD and the City by increasing hardness levels at each of our water customers' taps, The second strategy. as noted, was not acceptable. The third salt mitigation strategy, groundwater demineralization and salt export through LA VWMA, has now become the major solution to both the groundwater quality and delivered water quality challenges in the Valley, A mitigated negative declaration for the WDP project was prepared in February of 2006 and adopted by the Zone 7 Board on August 16, 2006. Due to the mutual benefit of salt removal from the main groundwater basin and the improvements to delivered water quality for the west side of the Zone 7 service area, the Wellhead Demineralization Project is strongly supported by DSRSD and City staff, and has the support of DSRSD's water committee and the City of PleasantonlZone 7 Liaison Committee members. The WDP site was chosen by Zone 7 since four of Zone 7's eight groundwater production wells are located within the area on either side of the Santa Rita/Stoneridge intersection and one of LA VWMA's pipelines (which runs westerly from Livermore) is located adjacent to the site, Site and Building Design The WDP site is at a major intersection, is relatively flat, but is at a lower elevation than Stoneridge Drive and Santa Rita Road. It is important to note that per State law, improvements to the site that are for the water agency's public purpose are exempt from the City's Design Review process, Nevertheless, Zone 7 has worked with City staff within a number of departments/divisions on the design and has included staffs comments into their plan. As proposed, the groundwater demineralization building would be one-story, approximately 9,350 in size, and approximately 36 feet in height as measured from grade to the peak of the roof. The exterior of the building would include a mix of materials; split faced concrete masonry; standing seam metal; and a smooth concrete base. The roof would be a standing seam metal roof. Front and side windows and decorative metal awnings have been incorporated into the building's design to enhance its appearance. The masonry on the building would be brown, the smooth concrete would be brown and green, and standing seam metal portions of the building would be gray, The trim on the building would be three different shades of gray. Attachments to this staff report show plan and elevation views of the proposed WDP building and site. SR 06:290 Page 4 of7