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7.1.H. - Page 37 Exhibit C <br /> -- " ..- - ° ;--- :;.1,:—...may� :44: <br /> „-s.: ..: r .. ma y, .. `S,° - - <br /> Y r,, $ '-• pa' i't m Y-- N §sew Pa a°S " <br /> 1 �. •-y1tp '` s n,--:,2 " <br /> 1 ..Q::.c .:e'-,Z..,». .- ...,-..:-,.... .,tds•.. .o,._, _.._.«...- .__..®-mom..°... -t_ t _ ,............ <br /> Figure 9.A stain remover applied to PICP(left)and subsequent pressure washing(right).Ideally,the stain remover is <br /> allowed to set overnight. <br /> Table 2.Summary Table of PP Maintenance.Maintenance tasks deemed essential to the hydrologic performance <br /> of the device are in bold italics, <br /> Task Frequency IVotesand Drivers <br /> Inspection Two-three months Avoid significant clogging by observation. <br /> Street Sweeping(preventative) 2 to 4 times a year Using a regenerative air street sweeper for most pavements is appropriate. <br /> Stain Removal Per client desires Stains may be tolerated.If stain must be removed,consider a biodegrad- <br /> able detergent. <br /> Weed removal Do upon inspection Use glyphosate. <br /> In high season 1-2 times <br /> Mowing per month Some permeable pavement applications are meant to be mowed. <br /> Do vegetated pavements have higher infiltration <br /> than non-vegetated permeable pavements? <br /> There are two ways to answer this question.Permeable applications that are not intended to <br /> be vegetated(like PICP filled with gravel,pervious concrete,and pervious asphalt)and that <br /> are working as intended will have much higher infiltration rates than purposefully veg- <br /> etated permeable lots.This is due to the lack of fines collected in the former. However,a lot <br /> that without vegetation and with sediment accumulated in pavement gaps probably has a <br /> lower infiltration rate than a lot with vegetation,because the grass roots facilitate water flow <br /> through the soil media.Were permeable applications to be ranked by permeability the follow- <br /> ing hierarchy would apply: <br /> • Unclogged PICP with aggregate fill,PC,PA —Highest <br /> Ii • Pavement with sediment accumulation with vegetation—Much Lower <br /> • Pavement with sediment accumulation without vegetation—Lowest <br /> Designers should remember that wh en a'grassed permeable pavement application is sped- <br /> fied,.:the,.designer is sacrificing infiltration for aesthetics. <br /> Maintaining Permeable Pavements 7 <br />