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rubber. In response, five vendors participated in the process and staff interviewed three, two of which recommended zeofill as an infill. Zeofill is a brand name of a product made from Zeolites which are naturally occurring minerals found in specific types of sedimentary rock (many in California, Nevada and Utah). While the use of zeofill is relatively new in the industry, its excellent absorption qualities, organic nature and overall safety assessment, has recently increased interest in the product. A brief overview of the product is included as Attachment 8. After reviewing all proposals, staff is recommending the contract for the purchase and installation of the turf be awarded to Valley Precision Grading, Inc., in Rancho Cordova. Staff conducted and extensive reference check and the firm is viewed favorably. While two firms recommended the use of zeofill, the proposal from Valley Precision was the lowest price and it turf partner, AstroTurf, has already manufactured and installed this type of field. Staff also visited a park in Los Angeles that is currently installing this type of field and found it to be satisfactory. To assist with reviewing proposals and finalizing contract specifications, staff utilized DMA/DiGeronimo Sports Design Group LLC which is well known in the field of artificial turf. While the primary difference between the two field options is the elimination of crumb rubber and the inclusion of zeofill, other significant changes are also required to assure a quality playing surface. The most notable of these is inclusion of a shock pad (padding that is placed under the actual turf material on top of the base rock) that will replace some of the cushioning lost from eliminating the crumb rubber and a much heavier artificial turf product (74 ounces per square foot versus 52 ounces per square foot for the base system). The heavier turf material also includes a "thatch" zone that retains the zeofill and allows the turf blade to remain upright. (Note, manufactures maintain the shock pad will also extend the life of the artificial turf and improve playability overall.) Shock pads are well established and widely used for football fields but the type of turf proposed is relatively new. Nonetheless, the fibers used to create the turf are well established and there is general consensus that the heavier product is beneficial overall. A summary of the differences is detailed below: SUMMARY COMPARISON OF FIELD OPTIONS Characteristic Base System Optional Infill System Turf Manufacturer AstroTurf AstroTurf Turf Model GameDay GrassXPe52 DT-32 Fiber Type Slit Film Slit Film Pile Height 2" 1.25" Pile Weight 52 oz 74 oz Crumb Rubber Infill 3.5 lbs per sq ft X Silica Sand Infill 3 lbs per sq ft X Zeofill Infill X 1.5 lbs per sq ft Shock Pad X Brock SP15mm Cost $1,532,032 $2,090,778 Page 7 of 9