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Home My WebLink About2014-04-02 PACKET 04.A.i.REQUEST OF CITY COUNClL ACTION COUNCII. AG�NDA MEETINC 1TEM # �I � DATE 4/2/14 ' � � � . PREPARED BY Public Works Les Burshten �RfGINATINC DEPARTMENT STAFF AUTHOR :��*�**��**��,��*��:�� COUNCIL ACTIUN RERUEST Accept and place on fiile the minut�s of the January 22, 20�� Public Works Comm�ssion meeting. 57'AFF RECOMMENDATION Approve the January 22, 2014 minutes of the Pub)ic Warks Commission. BUDGET IMPLICATION $ $ BUDG�TED AMOUNT ACTUAL AMOUNT FUNDING SOURCE ADVISURY COMMISSlON ACT10N [] PLANNING ❑ PUBL.IC SAFETY � PUBLIC WORKS [] PARKS AND RECREATION ❑ HUMAN SERVICES/RIGHTS ❑ ECONOMIC DEV. AUTH4R(TY ❑ - — — _ _--- SUPPORTING QOCUMENTS DATE 3/17114 REVfEWED ❑ ❑ ❑ ❑ ❑ � ❑ APPROVED ❑ ❑ � ❑ ❑ ❑ ❑ ❑ MEMO/I.ETTER: � ❑ RESOL.UTION: ❑ QRDINANCE: ❑ ENG[NEERING RECOMMENDATION: ❑ LEGA�. RECON(MENDATION; � OTHER: Ap�roved minutes of fihe January 22, 2014 PWC Meeting ADMINISTRATORS COMMENTS: DENIED ❑ ❑ ❑ ❑ ❑ ❑ � � Date **��*:��*��*��**��*****�**��*��***�:***��:�� COUNCfL ACT14N TAKEN: ❑ APPROVED [] DENIED ❑ C}THER ` � ` �' . _ � ' � - �;-�- -= -- . �: '- '- - - �- __ _ _ � _ . . 1 � Pursuant to due call and nofiice th�reaf, a meeting of the Public Works Commission af Gattag�: Grove was duly held afi Cottage Grove City Hall, in the Training Room, 12840 Ravin� Parkway, Cotfage Grove, Minnesota on Wednesday, January 22, 2014 at 7:00 pm. 't. CALL TO ORDER Commission Chair Tony Jurgens called th� meeting #o order at 7:Q0 p.m. 2. RflLL CALL Members Present: Tony Jurgens, Michael Edman, Peter Black, Matthew Forshee, Jeff Podoll, Michael Smith Members Excused: Andrea C[outier Staff Present: I�es Burshfien, Drrectorof Public Works Harry Taylor, Public Worlts Scrpervisor Jennifer Levitt, City E'ngineer Also Present: Council Member Justin O[sen Dave Nanson, Bolton and Menl� 3. APF'ROVE MINUTES Motion to approve the minutes af fhe November � 8, 20� 3 meeting was made by Jeff Podoll, seconded by Michael Edman, Motion was unanimously approved. 4. ADDITI4NAL AC�NDA ITEfIt1S None Mation made by J�ff Podall, seconded k�y Michael Edman, to approve the agenda. Public Works Commission January 22, 2014 — Page 2 5. NEW �USINESS A. 2014 Pavemenfi Management Pr�sen#afion l.es Burshten introduced Dav� Hanson of Bolton and Menk, formerly of Bonestroo wha, along with Jennifer Levitfi, wiil give an averview of #he upcoming 2n1�4 Pavement Management Project. Levitt at this time explained same members may not be familiar with pavement management sa she wanted to walk through some of the details and background. Levitt stated, "VUhen it cames to p�vemen� rehabilitation mefhads in Cottage Grove, we loak afi seal caating and crack filling as maintenance acfiivities that da nof have an assessmeht associated with them. Mill and averlay, reclamation and fuE( r�constructiorr are main��nance activities when an assessment wil[ kick in at 45% of the tofal project cast." Core samples were on display and Dave Hanson stated, °When you get a chance and see these cores up and persona[, you'il be able to see �nd understand a little more and better of what 1'm ta[king about. To abtain fihese cores, a machine is used to extract this 4" diameter section. In this par�icular sample from 1994, yau will observe a process that can occur in pav�ment called stripping. Sfiripping can ha�pen from the fap down and fram belaw. Stripping is when rnoisture separates fhe oi! from the aggregate. Blacktop or bituminous is a mixture of oil and asphalt, which Es the binder, (the gfue) and aggregate, When moisture gets into #he bituminous, ifi separates the stripping, and that's what's dccurring. When the asphait is str�pping, you �ose th� strength and durability." Another core sampCe was looked at. Hanson stated, "When yau loak afi the visual surface of the pavement, it looks pretty good with the sealcoat an there. Right below that sealcaafi, it strips aparfi, so it's just a mat�er o� time before this pops off and fhey ar� aut th�re patching and trying #o mamtain the stripped asphalfi." Hansan went on to explain that one af the issues with bituminous is to try and create a uniform mix, time affier time, year after year. "Th�re are a lot of variables; a lot can change with bituminous, In the early 1990's, there was a change made in bituminaus and I think that change is what we°re seeing, 17 years later. Bifiuminous in the industry has a 2� year life. In Cottage Grove, we'�e seen it iast 35 or 40 years so #here's a range. [fi you take an average of 20 years, some materials last 30, some last less than 20 years. Th�se cores up here, if you look Glose, you'll see fihis has some stripping from befow and from on top. The way you can tell is when you look at it, you can see a void where the asphaffi has 1eft. The more voids yau haue in bituminous, the mare permeable if is. The more permeable it is, the more wafier that can get in there. Public Works Commission January 22, 2014 — Pag� 3 Once the water gets in, it vaporizes and separates the oil fram the aggregate. The ideal pavement is getting it so that it's almost impermeabl�." Hanson went an to explain, "As part of the �roject, they evaluate the condition of water main that is und�rground. Throughout this area, there are six-fo-eight�to-tw�lve inch water mains. Any time ther� is a change in location, there are fittings that are bolfied tagether, During a praject, w� want to go down and take a laok at fihose bolts. In this area, a lot ofi water mains are from 1979 to 1997 and we have corrosive soils impacting and eating away the me�aL You can imagine what ha�pens if the bolts holding the pipe sysfiem together corrode. And actually right here (�ointing ta a sample), the contractor was replacing the bolts on the valve. When he got down to look, fhe head af fihe bolfi was gone from the top of the valve so �hey've been replacing bolts. UUhen taking a hammer to knock the loose bofts off, the top of �he valve flew off." "In this area", explained Hansen as he pointed on a map, "We found the broken valves. As part of fihe projecf, different valves will be dug up and the bolts will be replaced which will eliminate wafier main fea(cs. And same of the bo(ts we look�d at were actually pretty good. Some yau can see they �re gone; they flaated away." "Starking in about the late 90's", cammented Hansan, "We went to stainless sfieel bolts. The problem with stainless steel balts was when the contra�tor puf fihem on �nd fiightened them, they pufi too much torque on them, heated them up and thaught they were tight. They weren't and aIl of a sudden when pressure was put an them, they leaked. Th�y are now using what's cafled a core blue bolt, [ should have brought one. The manufacturers of hydrants changed ta thes� bolts where the fittings and the water mains come together. In addition, also starfiing back in the late 1990's, th�y starfed wrapping the water main to protect it fram corrosion. The wafer main pip� is acfually in a type af bag to keep th� corrosive materials from touching the metal." Hanson went on to state, "MnDOT per�ormed a study through the local research board that took fihree years. They didn`fi like the results. MnDOT is now sfiar�ing up a secon� study to #�st ofher things that they didn't tESt the first time. L.ike l mentioned eariier, the permeabili#y of pavement, the amount of carrosion and how quickly water can get thraugh fihat pavemenfi is w3�at they identified in fihe firsfi study as a problem. Once water gets firapp�d, it can vaporize and blow apar� bituminous. The question on the street is, have things changed? If fihey have, sl�ould they change mare? It's the one hundred thousand dollar question. ! believ� things da have to change. 1 think the change fio the specificatians was made araun� 2002 because af the s#ripping problem. If you were to ask any experk in bifiuminous, #hey would agree the product is absolufie(y befter now �han if was in the 90's ar 8Q's." Public Works Cammissian January 22, 2fl14 — Page 4 Hanson went on fio state, "F'or exampie, aggregate saurces in Minnesota in the Twin Cities are not in a good situation. All the good aggregate has been used up and ifi you have a(arge quantity of aggregate, you have poor quality aggregafie. Thaf aggregate is probab(y a little softer. lt can absorb more oil and the ail fihat's supposed fio be used to coat the aggregate is now stuck into the aggregate. If you don'f know how ta measure ar�d figure that all out, the bituminous wan't last lang. Now they have fiests to measure aggregate in certified p[anfs. Every biturninous plant in fihe metro ar�a is certified and naw requires tests on moisture. As they are producing, they test that mat�rial to make sure it doesn't have too much moisfure as they are mixing it. If there's too much mdisture, the oil is nofi going to stick fio the aggregate." "Some of the complaints we received in 2Q13", stafied Hanson, "were about compactian. We got a lof of camplait�ts from residents about pictures being rattled off the wal� because af the compaction equipment (the sfieei drum rollers). Compaction is real critical fo pavement for Iong time durability. The mare you densify, the less air that gefs in and the less impervious it gets. We do measure that density and there are a coupl� examples of tesfi cores thaf were taken. [ believe in 2013 ther� were 50, probably 10Q total cores taken. ( believe �h�re were fess than 6 failures." Dave Hanson sta#ed, "In 2010 or 2�11, the metro area and the City of Cottage Grove experienced a lot of debris in the recycl�d bituminous. B�cause of the economy, a lot af street work occurred during the recession. Th�re were hundreds of fihousands of yards of material stockpiled and there is value to it, but there's oil in it. The contracfiors didn't manage it, so there was a lofi of debris in it. When they re-used it, fihey c�idn't get all that debris out and 'it ended up in the surface of the pauement. ln #he 201'f project, we had some prob)ems with that, rubber and sfiuff like that gat in fihe pavement. One thing is debris, th� other thing is trying #o guess how much oil is in that old bituminous when you mix it with the new. There are studies out fhere shnwing that bituminous that has b�en recycled has potential to have mare cracking in the pavement. The City af Gottage Grave stopped using the recycl�d materi�l in their wear course." Hansan cammented, "One of the studies MnD�T did on the stripping was ta bring in that factor of salt. What happens is that salt ge#s down in to the bituminous and there's a litt[e flume of s�[t in that gravel base. Underneath tne pavement fihere's a gravei base; ln the City of Cottage Grove, that's mostly sand, but there's that salt flume there and every time it freezes and thaws oufi, �he more salt tha# gets down there. S�alin� fihose joints is important. Voids can fill up wi#h water and salt, explained Hanson. "94 Street showed a bunch af crack�ng on the pav�menfi and wher�v�r thafi cracking is, there's a fhree-to-six�inch-wide white salfi map following the cracks. At one time, the water went dawn the crack, li[ce an your garage floor. The water evaporafes and then there are salf plates an your garage filoor. You can't see �he depression in �he cracks, but it is there". I'ublic Worics Commission January 22, 20'i4 — Page 5 A questian was �s[ced, "Would `[fi be betfer ta not saw and sea(?" Hanson responded "Saw and s�al was first done in 'f 996, and for many years, it was very efFective, but now th�re's been such improvements with bituminous fhere's now a seven year study proving with the change in fhe mixes, saw and seal is not really necessary. The perfarmance of that bituminous, because of the oils they are using, sawing that pavement is not that criticaL Af[ pavement is going to crack, when and how much and where, we don't know. In 2013 and then way back in Pine Summit 2 we put dawn a different bituminaus. )t perFormed better, so the cracking will be reduced." B, Observation and Inspection Tasks for Typica( Pavem�nt Nlanagement Construction Projects Hanson explained, "For this particular praject, there were act�aally 2�/z �0 3 people on the job at all times. Da�e Tutant was tl�e prime inspecfor for #he project. He also had an assisfiant, Jackie. Jackie's role was communication and I'lf falk about that in a minute. The number one role of the observer and inspector on fihe project was resident cammunicatians." Coordination and Schedulinq "Vlle get involved with thafi pretty deeply", stafied Hanson. "The residents want to know what the schedufe is so we are constantly workmg with the contractar trying to understand whaf his schedule is. We review the schedule on a weekly basis. We had weekly meetings out on fihe project with ali ofi the contractors and sub contractors so that we coufd understand their schedule and cammunicate it to the residents. Coordinating and understanding the confiractor's schedule was also key. Coordina#ion was needed, and again, 1'm not going to go fhrough afl of them, but the nexfi ane that really stands aut is the coordination and testing required on the project". "In #he project manual and specification, it's prefty clear what the requiremenfis are in testing different materials. There's a lot of information in there and so as an inspector, we have to ma{ce sure the contractars know what we need ta do and we have to be doing wh�t we ne�d to da in order to coordinate thafi". Continued Hanson, "Maybe more specifically, contractors responsible �or the quality control of the project is quali�y assurance. As an �xample, the contractor whn is pouring concrete curb has ta perFarm tests an fhat concrete curb fio make sure he's �rovEding the quality product fhraughout the whoEe time it's being placed. What we do on behaif of the owner and the City, there's a third �arty fi�sting firm that is hired and does quality assurance. We randomly will go out fhere onc� or twice � day and confirm whafi the fiesfi contractor is doing, A lot of the time it's the people supplying fihe materials that are do�ng the testing or the actual contractor placing ifi, but someone is t�sting that material. WE da a check of those tests." Public Works Commission January 22, 2014 — Page 6 "For concrete we �re testing," said Hanson, "we look at how much air is in that concrefie. We're testin� how much that concrete slumps when if is initially poured. We measure the strength of it and want a certain sfrength of that concrete when it's all sa�cf and done. "After 7 days and again after 21�28 days, tests ar� conducted to make sure that the concrete meets the required strength. The gravel base is a gradation and all the gravel base we put in on a project has to meet a cerfiain gradation so when ifi's placed, it all binds togefiher and compacts well." "The campaction tests are don� to make sure th�re's density in the gravel base", added Nanson. "On fihe bituminous tesfiing, much of that is the c4ntractor's responsibility, Again, the owner does some quality assurance tesfiing." � Nanson indicated that testing is real criticaI anc� anather responsibility is making sure the materials that th�y are placing, (if th�y are placing a hydrant or a sewer pipe underground), is to tnake sure #hat the pipe is meeting fihe requirements of the specifications in th� confiract. Ther� was sanifiary sewer instailed on Joce(yn and that particular sewer has a certain class of pipe. The trench they dig fo put that in has to be compaCted, so al! the material is tested and densities are taken as fihey pu� #hat material back." "As an example", stated Dave, "On East Po�nfi Douglas Road, in front ofi Wal-Mar�, the ir�itial base was placed and the testing showed the gradation failed. The material was too fine and we did some retesting and it sti[1 failed. As a requirement, the aggregate has #o be so hard that it doesn't crush and deteriorate over time. All that testing delayed that project a week or ten days. 11Uhen you have material failure, it's never a good thing. V1/hat happened on that project is, the base did remain in plac� but there was a deduct af about five or six thousand dollars. That parfiicular penalty is laid out in fihe specifications." Hansan also stated daily reporfs were kept by Jeff Tutant who did much of the documentatian on a[aptop �xplaining exactly what was occurring and what h� observed. lt's amazing what is documented on the daily reports. The way the contractor gets paid is by the bid items. The contractor only gefs paid for what ha places. Cur� �s paid for by the [ineal foot so everything has to be measured. There is a unit price and a unit measurement. All fihat is documented and again, as an inspecfior, we prepare the paym�nt document. The confiractor reviews it and so the Ci#y controls thafi payment to the contractor. So if we see a grave[ base has failed, I hald back and do not pay the confiractor the �ravel base payment. ! ho[d back about 50% until ali calculatians can be don�. If the inspecfor knows the producfi is not meeting the specificafiions, you ho[d back payment un�il it is replaced or corrected". pave Hanson indicated ane ofi the biggest challenges in 2013 was that fihe project was so large and there was a lot of acfivity happening. Making cer�ain to get the right Pub[ic Works Gommission January 22, 20�4 — Page 7 information and scheduling to the residents was challenging. "We did it a bunch of different ways and it seems like it's never enough. You #ry and give them as much as you can. Weather, obviously, is a challenge. Th� other is the size of the project, and the amaun# o# activity going on. I# was tough. We had one person that pretty much monitored the hotline where residents could call in and ask questions or get things answered a��d she (Jacki�) worked pretty much full time responding to residents and their questions". In closing, Dave suggest�d commission members call him if they have any other questions or concerns and he wou[d be �lad to discuss. Commission Cha[r Tony Jurgens said, "I see my role an this commission as being an advocafie for taxpayers of the City, �ut we can also do that in revers� by gsfting some af this informatior► presented tonight and be an advacate for the City. I think its good Dave is here to educate us on this. As the Pa�ement Management projects gefi to our neighborhoads, people in those neighborhoods will have questions and we can he[p pass along what we are [earning. We can always increas� the quality of the work if we want to pay for it. !f we want fiighter specs and a betfier praject, it'll be a bigger price tag. Ti�is was good information and I appreaiate you taking the time fio come fo the meeting tonighfi." Dave Hanson said, "All the years 1've been daing this, th� more you can communicat�, the beffier ofF you ar�. What I have found is that people who are upset or have issues do not have a fu(I understanding, so we sit down arid meet with them and s�� what the issue is and th�y then ha�e a clearer picture as fio whaf is happening". 6. OLD BUSINESS None. 7. PUBLIC W'C7RKS UPQATE l..es Burshten repo►�e�: o Crews have be�n out snowplowing; o A dock is being built far th� halding that compl�ted by spring a lot. pond south of 7Q Street. [t's hoped to get lnventory has been completed in the Shap Specs for the new dump �ruck purchases are being reviewed Public Works Cammissian January 22, 2014 — Page 8 8. CIl`Y COUNCIL UPDATE Justin 41sen re�or#ed #hat coming up this weekend, January 25 a goal setting session with �oth Ci#y Staff and City Council will take place. O(sen a[so mentioned that caming up in Fe�ruary, som� Commission terms will expire and he would like to know who is interested in returning. Olsen �Iso indicated there is goirig to be a benefit fiar PubGc Safety employee Greg Brysky at fihe R�d Barn on Saturday evening, January 25 JefF Pado[1 asked if there has been any new information regarding the wafier fower maintenance projecfi. 41sen responded thafi l.es and Public Works staff ar� putting tog�ther some addifional information far the Council. His guess is that this topic will once again be on fihe agenda very soon. 9. COMNIISSI4N CO[VIIIIlENTS AND REQUESTS None. 10. ADJC3URNMEC�T Motion ta adjourn was made by Michael Smith, second�d by Michael Edman. Motion was unanimously carried. Meeting adjourned at 8:�9 pm. Respec#fulfy submitfed, Pa�ricia �tor�y