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HomeMy WebLinkAboutFwd_ Canyon Loop cement v-ditchesHi Dick Just FYI. I spoke with Ryan Winkleman this morning and explained our approval to this RFI. I think with thr cobble and diverters we should be able to address any water erosion concerns that Fish and Wildlife may have. Please feel free to contact Ryan if necessary next week. Thank You Ryan Wright ________________________________ From: Winkleman, Ryan <Ryan.Winkleman@mbakerintl.com> Sent: Wednesday, November 23, 2022, 11:35 AM To: Ryan Wright <RWright@DiamondBarCA.Gov> Subject: Canyon Loop cement v-ditches CAUTION: This message originated outside of our City of Diamond Bar network. **Please exercise caution when opening attachments or clicking links, especially from unknown senders.** Ryan, I received the monitoring report last night for this week from Endemic and wanted to ask about the swales. I was not aware that the project was going to be constructing cement v-ditches. I’ve got a copy of three of the pages of the trail design overview and they only note that there would be cobble swales installed, which suggests to me a shallow ditch filled with rocks to slow water flow down. I don’t have any of the actual detail pages that presumably note that these swales are actually concrete, not cobble. Dick’s email from November 7, where he addressed some of the drainage questions from Robin Smith, noted that the cobbles swales will “have ‘natural-appearing’ rock cobble to lend a more natural look to this drainage improvement. Although smaller in size, the inlaid cobble is the same color/texture as the rock fill for the Gabion Wall components.” The photo below does not look natural at all, it looks completely manufactured, has very little rock actually in it, and as I noted above, is concrete, not cobble. I’ve looked at the design overview plans and see that there are several more of these located throughout the trail, including one on the western end very close to the drainage. I emailed the photo to my coworker who has a regulatory background and asked him if this was going to be a problem with the fact that I’ve been telling Fritz Rieman at CDFW that the project has no potential to affect any local waterways. He noted that without any sort of splash pad or “velocity reducer” as it’s noted in the design plans, this would in effect just funnel water straight onto the trail and potentially cause more erosion, and depending on the possibility of sending sediment downstream to the drainage, could be an avenue where Fritz says a permit would be needed. I see in the plans that the velocity reducers are planned but just don’t see it in this photo yet. Since this design is news to me, I guess my immediate question is if this is what it’s supposed to look like. The design plans say “cobble swale” and Dick’s email said the features will have “natural-appearing” cobble, neither of which describes the photo above. Is there going to be actual rock put into this? I’m obviously not an engineer, but to me this doesn’t look like it would be too effective as-is with reducing flow, especially in strong rains. This isn’t an emergency but right now more of a clarification to make sure I understand what the project is putting in, especially with any coordination and conversation that I have to send to Fritz in the meantime while you’re out. Thanks and Happy Thanksgiving! Ryan Winkleman | Project Manager/Senior Biologist/Certified Senior Ecologist 5 Hutton Centre Drive, Suite 500 | Santa Ana, CA 92707 | [O] 949-330-4115 | [M] (949) 533-0918 ryan.winkleman@mbakerintl.com | www.mbakerintl.com <https://linkprotect.cudasvc.com/url?a=https%3a%2f%2fwww.mbakerintl.com%2f&c=E,1,U9WIxJcPssntxoQUZ6mUEcWON70NX3eI51gUxvT9FxilekMmR1G29q2c2aEqA0JeURY riY07Y9TdDnm1JzHlgfeXhzAEhueNsk7pPEwWuVTYLftXgXL4rSW_&typo=1> <https://linkprotect.cudasvc.com/url?a=https%3a%2f%2fmbakerintl.com%2fmedia%2f5024%2fs21_f_061907_icons.jpg&c=E,1,7uocR3xN-dcJwXGxzMk eePaGs8CCE719ll3ViiswW0oxW4GPc2VUOt8W1Pz307T7U3IhvnvpoBEAmZbeDEqXExhclUiEsy4l8mhbZbEL40jJ_sLZaPlA8-JC&typo=1> 䱞⮰쩲ꁓ啴刧ᐪ䨺橛烙誕⽧⻏뇺뢭텽祧뤎陯뭝턣Ꮊᇉ㊚幭Վﲦ﷤徭睦释Ὁ䆕䥕벃⡈贯흆껒妜쟄욼ꒅﻡ诣㝓鈧ṓ홴侇鄸ࣥ捱跹Ʂꕫ錻놣蔳䋠㰦袖ϔ娾寈藎껯✴陃㒕杳ﻙ�医廯캘ɠ认핒�䯫穿紿틽龯纭웷俘찞奔틴翟ﳽ�|㎝漅䷝㬪砻็싗⍾⮯兤␮幽䢍篗渢鴃㑯쐫뤦唈ঈኵ۸鶞鞌饱藕헃铍ㅻ廩萫湪戼蕑隀ᨬ❖輝ퟘ黓ཱ᤾誠ㆴ좂㫽⴩頞䌦簭棐䙂�ɖ뫟﫚폥忙놾诼잷㜢蛽�뤮䓍魱订稳䳁翎ꩥ훸즙㘏眚Ꮗ䟗孢 䜩햋鯞㻉쾜᫞㼏䦙뾽ﵞﳼ仄ﲊ固寣ꜗ嚯濝늹ﱤ拶㥱㣫൛掼歾ᄘ鱖䟺⎛鵯뼛锾㎺뮛鸾㲺몚崾멾站깾睵炱륧東陭⩕봔퉃懞坹뚯듻퍤㞏靚ቇ䭧�摆䘺ध퀵ྞ뀱괪⁅謲婤咾ⰾꀅ㳯쫶嵫轇믳篻瞎ᅬ藢﬿帿࿼�忇ൾ빨쓻㤩ꑟ좓㱕彴ꯗ呇䈃郍㵘埄ญ蝨㖹ꃐ텿⟠푭ジ菄ﰙ솸홧Ⰴც຦둛呡䐟渵鲃裑⡜蹴ᙲ�⩍庛ꤏ܇͕䘃ꍮ懸芋ꗯ⧴턏碌Ḫ䴦铣⑜㷫┻緬◽韨凫泧퐡㈈栵墾撱栝槎㫎ᗌ㴿鱝㴟匿벻룐晷搾뛖Ã瓴ꐊ挅㣊᧌㦻髍䘽ࡹ 跓υ⍠竡ⵊ斆﷝ᒘ矺麹㈯ŋ蟱ꥐ❱⻝얗Ꭼᰊ㜨಄好ꮙ靧୆俐籥쾬몊⠭Ꮦ疤怊湮㷚੣䢳䏊制맾♺ꏣ콁犴⩊揣贈懘섂ﴀ캝텫鴦외䭫ᦹ॰ට䀍ᤅ⮯奈ਧ颩髝奰皣䠴�饆❋뒃঄ܣ�娷�խ챒룹祑䁰햊ꡨ༭鈀⿠禠碀꽠≺襒ᜆ锚⩦ᰆ䠏盗蟠썛Ⴕఀ蛠ཝء௸㄀췁臛芁鿀㣵晼槄ᠼ똞紘�ꉉ踌㔘鍒慞⯑橍庩럊꒨ㅆ䀿盢䃄閪鴶鈆᫆薹聖—ച冣ꝃ엯輑ᝅ䲥�ꆜ᳑쵫ﭰ⋾܅ₑ᥌嘛兴띥䴭c縰饄큡펂꒒䅵撳葬겨僃魰檱쪀귚ቱ뚝稈鵙‚囸态 ⟝兰᾿䑑䌉䏁䇗ᢂ晕㢹냪韛쑻ᵝ䆪䩮䆂πܨóų샳䁚湁�⡆恷ᇃᎸາ藾ₓꠈ׊玓얓妁�胶퀺搰Ꜧᢅ爒츘巀츠퐶⸂﯊窺봏丂緒砊丒求ፐ瀼�清ᰇ䔏堀ď࣠�䚷ก솂ꅍ聜륋£ឃ 㣞耍肙↰㛁ư௒尤㼅⥑⃏퇪믲癀涆࢖෋쏰롕ْ⥿ꡃ偯gꏐ愬㑇캢썓丧ෙ䩦֣걋乪Ì쇸鶱뀺鶹Ü�藝፲쇺‶㡸ᘏꞂఝ٬␏Γ퇺र꧎寬ح㎖얞玄銨⊺鶥륋ꈦ尻慚䏑ᧅꤋ丒ﱦ瞛鼗ꟽ羟潶�⪇劬괾𤣵盔え㴀뇐ﳃ掎䆐镭컖졥㠂햶ແ숸炿舆俁毰窆ﶕ택⨦ ﬇茕竽袱勺ꂴ宻ိ甍瘿凈�掉ꆚ刁풥ฌ犂๕ᵏ౗ꣵ뷸璠ꟅǼ僕䆧毜䪡沾鎨⨵䏵꣝ޘς졗ꥰᒈ錏쇂춸୚寑梭⫔ᑣ葂갷ḟ넊션䴯⨲䦑某䣓♝ꬭ칗諗�ﺊ�ꃰꡉ遌滴赎쉡苁즋ు땣䑺옠橥ᆇ鉪ﮅ坔夫줜㘯ᨋཞ쓯鍑摘槓茙Ⓨ䈖톾ꔺ鐙䪺昜㜱ᮮ蕍鋇ᒑ멃ᨌ冇囕ڥ灗蹯仢園焉㠥╉樚卥蔓䳌㼹ⵟ㔬翾鵅鏧䣜�Ͽ琩邊��䴌鮳썬曮뻲Pꘊʀ⠊뷯海ꪪ�瘛沓조鰱㇙晫�뒮㩷泩ᅈ䡒ꋺ㺐Ậ䊺被䐌鄢ꗦ◯餒ヹ墁蘧델㖆崚鴺땨昈푓䚉쐱 홫壧耒松뼦襓尾ᶩ拔툅P᧫紞咸뙹罞빼쵲﫳毫뼳뾼ᒶ镲杉甞ࡖ쀄ᬷ쫹勵�띷ྖꇪ벍컁ɧ�쯠暝噪囀脳퉎䫛礈黎곧í獱ﲡ跉喝眀駑퀒竕쫴祊쐹滜漕䮵鴠�縋댧鬢堑仈튋쉸ٍ�官⏚쨬⤐겞름�赓エಗ艖㥜仨ꑳ넏䙳ᾫ㊡㮬⇧蓃䰽䐺⛔໠䌞ᱹƕ퐂㩮鉀驑�儍뭔猘㱕�⧧깰踨傄ྫऱ絖槐ፏⳚ졥阳Š仔絖셤㞃Ⲃ�댌Ņ뭏׬�ﮊ줻櫐넾쥙㗬ꮋ쒅표䰋ꅿё徾䛉縛泾筦ᒿ쯛隆䲂䞃뙯ྋ᭖콷껗ੵ쵻勤汆맅洔ங᮲샩闓埚澟뼖컜ӭ 辐꽵盱ルꭢ烼瘦┩凌㦖燖ᒭ�퓥閳폴ﳵ趓曂籁邸櫻靈眷罷ꅶꭵ즕倅鱐뱊켫ᇠ㚻繚䫧뺔짟졜꾺﷕妻믾㭛徟縉뗱췍䛱⵳櫢뜙䛥勉�쟬춻ᮧ잍赫宧孳Y䊅ﻨ畢ጣ읨笼׳긿跊난柬眼턛鲃땰뷤껜㾅꫟嬿罎Ⴘㅴ䐅삻驛㭹ặ晴卬ᇋ滷鴥⦡櫁祈퉰봀鲕쬵㈗립�녶離컶鿢�햾⾉鶄ᅋ㝺ꨟ沸拒Ꜫ肶᭎ﴀ﮷鼳ឮ楦秝崑兛㍢�볝뎪嚂➖㤭더륾맗錽劺隉匨꓂塏쾦嶇ŋ갶쓓蚍䢖鳜뼋Ⳙ��覜냎᪖⩭딻ছ캶绪潺쟵㯗雏쾓튖छ㍦�텛垠墫ݏ 둯◲뽚ᗬོ訖ិꬲ睹ꗞ�舕ぢ紸쥶ﲃ췩��땹릚呯༼⏦봿믋齫희캮犄㚔卤灅掛�캕㨌连⠔푋䆮צּ帪悗臓ﺒ퉥㰀䝁⏏楦䎯㦧㫁뢂䘡ᙛ╊姡齒챣ᄳ썗੗헢澢䨣ྜྷ뜺�豚栉㞆黣峽拰눵䣟ᣥꂧ듓悶뙻︜䛮꟭촇딻㋠�台跑ᝧ⼛獗朷ᖣ鳞㐦�Ế幥횮夾�諊㪯ﶥ匐좷챟徧ᒯ�︨웪忌忝폸ᝏ뛋替紆竹O噠ힸ糴容喾廷誯靏伳늖텭Ჲ뾰毞櫅臨糑竨翕♳磾﬩仉쇭䋮볚ꃇ㬞剱〾㲢꠽`悜⺊䋛嶔輍㹣홀碽㜌စ朋뤰昴䉤ᡡꦑ文 釲톩現䜽鹏﻽⟣צּߺ럃췿﬿7鿶䇿퇯ὣ寮뇎�秭�ィ皐楊ꡐܦ䞆뷷뻻䓸郟桢ヘ鴡깮ḝ೔ꨍ蜇荔풃웡Ø象썉픘꬞揎㋑ᕺ㔦촍⃛饳꒕ϔ쏐⻐䴷辎㢞Ს耘큱┲�皰푝䎍ᛧ塰☼禽䑬꙾㹗婸㐽爸죬ꧤণꋐ␙ⴢ쟐โ悋诓荶懏–๦괹沝뭬嶑䘭�㣕봨企瑙ᡥ鉇✲궀獩휘蚳칉眨敩낍䧐锂ꅰ쑞㛬䲙鍣阰ّ쮳퇅쬨叔曉댦ꭘᣳ剡㭌䚵滞紇᪲쿷ꍥ䓵┰ﲝ䭊⎧渝⋼噠댁颈쑙绍૒弴뤈䧫�ŋ䯐鮇䠲툉ꀘ꘿熖鴶흠ᚁƔ烼無᧞㭳ణ䋩걐୉鷙楉掏䀎麭Ĉ菴偮ࡋ 㽙쏡ဌ㆐Ъ䷃㜱見쑃❏ᙹᄘ㋈៧㒺꘮㚯촪걔袞䮀ण袹㲤ӮÇ䉙쀪샨嶚e䵰胐》䀖㰕⒅ᯀᢠ˜臿䋋嬡觲�어ꗠ찰얬藠豅謎究�骨죔傆誽ᠲ茨⫞䦗홫궥攏�뵚㞒ϩ㶸㩈ἀ⸣�픅ꒇ楉୊㹐Ӧ鞲଎䜃䖟勣ُ궤貓㶠穲候厜ᐾ푄屑⌺Ꚙꘑ槛₱鐒幆৴粨㻜氹ʛ爝⛒똑鴌ꦖ稇ข葓ⴖ鲪⡰癥Ⓟ큤㔼㴱晸뀤လ쀹洨䧔嗫厔ঢ়䁲〻穝暖ཬ瀷滯຃핥哥鹩烾᧳夀Ԉő䄋怼縁꺅Ḍᰁช睛ᢚᕊ