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City of Redwood City Recycled W ater Task Force Report Marc�, 200�4 ^� natural turf. In addition, natural turf fields must be periodically taken out of service for reseeding. The City Parks and Recreation Department estimates that synthetic turf fields are available for soccer use 14 hours per day (assuming the field is lighted), 360 days per year, while natural turf fields are available for soccer use an average of 5 hours per day, 275 days pe•- yeaz. Although life cycle costs for synthetic turf aze higher than those for natural turf; on a per-hour- of-use basis, synthetic turf is more cost effective. The City Parks and Recreation Department estimates the 10-year life cycle cost for a 4-acre playing field is $295,000 per year for synthetic turf and $166,000 per year for natural tur£ However, on a per-hour-of-use basis, these same life cycle costs aze $59 per hour of play for synthetic turf and $121 per hour of play for natural turf (based on the usage assumptions in the previous paragraph). Information provided by City staff regarding natural and synthetic turf construction, maintenance, and life cycle costs is provided in Attachment 3. � � . . �' ' � � -� f �€� � � �� ,,�: 1 � � � s � r w n.�r�.fR�i.v � fi�h d �f' Natural 166,000 121 S nthetic 295,000 59 Manufacturers of synthetic turf predict a 15-yeaz lifespan for their products; thus, the actual life cycle costs for synthetic turf may be less than those estimated above. The City Parks and Recreation Department strongly supports replacing natural turf on playing fields with synthetic turf. 3.1.3. Existing Groundwater Use In the course of its investigations, the Task Force leamed that a portion of Sequoia High School is imgated with groundwater from an existing well. However, the Market Assessment assumed that this portion of Sequoia High School was irrigated with potable water and estimated this amount of water to be 71 AF/Y. Alternative E, which is based on the Market Assessment, induded Sequoia High School among the customers to be served recycled water. Thus, the 1,946 AF/Y of estimated reduced potable water demand provided by Alternative E included 71 AF/Y from this portion of Sequoia High School. This 71 AF/Y is also included in the 290 AF/Y removed from Alternative E when schoolyards, parks, and playgrounds are removed from the list of recycled water customers. In order to make Altemative TF comparable to Altemative E, this 71 AF/Y must also be included as reduced potable water demand under Altemative TF. Part of the portion of Sequoia High School at issue has been converted to synthetic turf. Accordingly, of the estimated 71 AF/Y of potable water demand attributed to this portion of Sequoia High School, 14 AF/Y is accounted for under the synthetic turf category of Altemative TF (see Table 1). The remaining 57 AF/Y is included in this existing groundwater use category. Page 6 of 12