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3. 'rhe dense landscapil.""1g and :te.ncing along tl""1e southern part o:t-tl""1C site; 4. The limited hours o:t-operatiol.""1 betvvee1""1 10:00 a.m. a.1""1d 6:30 p.n""1." VV"ith some acti-vities continuing at a smaller scale until 7:30 p.m.; 5. The existing ambient 1"1oise d1...1-e to traffic", trains", quarries", and airpla..nes; 6. The use vv-as seasonal", lasting only Tour months; and 7. No portable radios and li-ve or amplified music "V'Vould be allo"V'Vcd. l"v'lr. lserson advised that the noise st.udies :tocused on three main" potentially sigIlificant sources of noise: 1. "VVater pumps". located in enclosed buildings. Specific proposed mitigations ""ere proposed such as acoustical duct liners", acoustical louvering", and closed roo:t- hat:ches; 2. Th.e P.A. syst.em "VVould include noise-level regulation on eacl"1 speaker t:o keep the noise ""ithin tl"1e 70 dB at 25 Teet: starldard; al."1d 3. Eight:-foot tall barriers vvould be used on the plat.forms of the vva.terslides", extending completely t:o t:he ground. ~rhese vv-ould deflect the 1"1oise l.""1orth"V'Vard", avvay from the homes to t.he south. The noise consult.a..nt a..nd peer revievv-er examined the Vintage Hills noise and concluded that VV"hile some noise may be a1...l.dible in some properties" it vvould not exceed City standards due to the distance mitigations and ex.istence of lovv ambient noise levels. Therefore", tl""1at n.oise "V'Vould not be a signi-fi.cant impact. In. response to an inquiry by Commissioner Fox., l.V1:r. Iserson conf:'irmed that the -fIeld noise tests included people screaming. In response to an inquiry by Commissioner Sulli-van", IV1r. Iserson confirmed that t:he Plexiglas vv-as clear a..nd vv-as rmsure "V'Vhether it clo1...l.ded over time. He noted that it V\Tas i..~t.ended to shield tl"1e sou.r1d and direct it aV\Tay from the residential neighborhoods. Both 1""1oise consultants believed t.hat V\Tas an e:t"Iective solutiorL ,^,,"ith respect to -visual issues" staff believed tl"1at the bu.ilding designs vv-ere attract:i-vc and vv-ere made of I-Iardiboard siding and either metal or can-vas roofs. Staff belie-ved that the design. of the buildings vv-erc appropriate :tor a recreational attract.ion. Sta:tr- suggested th.at: tl""1e colors be toned dovvn" elimil"1atirlg tl""l.C teal arld vv-hite colors and retai1""1i1""l.g t:he greerl. and broVV-ll colors" so that it '\..Vould blend vvitl"1 the surroun.ding areas. At tb.e Commission."s request., the applicant: provided a1""1 additional photo simulation", vvhich shovv-ed the site from the Stanley Boulevard median. ~rhey also submitted a panoramic PLANNING COl'Vll'VlISSION l'VlINUTES December 10,2003 Page 7 r ,..- .. -r-------;