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Exh 8E . ~s ~~ ~ AGENDA ITEM NO: E ~ ~~ ~ ~ G ~ ~ DATE: '7- ~ ~ -9 h ~ C'ITY OF ATLANTIC BEACH 'Qy~~-~j . CITY COMMISSION MEETING ~~:%~~~~ N STAFF REPORT AGENDA ITEM: CONTRACT FOR REDESIGN OF STORMWATER AND UTILITY PROJECT SUBMITTED BY: Robert S. Kosoy, P.E./Director of Public Works ~~~~~ ~ ~~~ DATE: Jidy 7, 1999 BACKGROUND: After the City's Stormwater Master Plan was completed in 1995, the City contracted with England, Thims & Miller, Inc. to, among other tasks, design a stormwater collection ~ system for the Core City. This design was completed in January, 1998. Due to a strong interest among the citizens regarding environmental impact of the project, the City decided to modify the design. In addition, the City decided to include design of strictures for tailwater control. On December 13, 1998, the City Commission approved a contract with The R-A-M Professional Group, Inc. (R-A-M) for a Preliminary Design Report. This report was completed on March 17, 1999. On April 12, 1999, the City Commission directed R-A-M to revise the report to indicate what level of service could be provided within oiu budget limit of $9 million. The revised report was delivered on May 7, 1999. Tlus report was reviewed by the Stormwater Review Committee (SRC) on May 18, 1999, and a Public Workshop was held with the City Commission and City staff to review the report on June 2, 1999. Additional questions were generated during the SRC meeting and the Public Workshop. At the June 14, 1999 City Commission meeting, staff reported that R-A-M would be responding to questions from the City Commission as s~unmarized on June 8, 1999 by City Manager, David Thompson. We received a report from R-A-M on July 6, 1999, and believe the questions have been adequately addressed. Several of the questions will be answered in more detail during the final design of the project. RECOMMENDATION: Authorize staff to negotiate a contract with The R-A-M Professional Group, e~9_ Inc. for the final design of the Stormwater Project. ATTACHMENTS: 1. Letter from R-A-M dated July 6, 1999, respondingto discussion and questions of Jtme-8; I999- REVIEWED BY CITY ANAGER: ,_ . l~~-a~~ Co~~ Manager's ~/`~1 ~~ c~Sp/v U~~~s~~ _ ~~ ~; ~ ~~~~~ wmr~ . y LtJ~ /2/~ ~'j~ ,~ 1~(~~, ~',,~,~~zu.Gs~~ .~1~!'~c'7-U ~~,.~c:~v ~cL~ cow" so%~~tc~c~ --~ Hof G~ ~~~~/ ~~~ ~e, , /~, fpm ~ "~ ~= ~- /~r/~~~,, ~~ ~ // -,L ,~ -- ~ V ~// ' ~~ _ ~O ~ ~ Ci~/~ I7 `U G Gffc~ Lt2d~~a.~ ~ /~/!~ cord ~r,~c.~'L 5/B '~iirn~«~q,', a'.~ P ~iS~d~~ ~Gl~~ ~ ~ ~ ~FP~ , " r /Q Cy00- CAS '~0 ~~'2~E ~OT.~'~'J G~ ~S ~~~ ~ ~ ~ ~ `- - ~ ~. d,ti.;,~ ~titi~c/ pro-~'~ - /I~o SIZC~/~- ~~ ~'.~/' act ~ /I~o co,~ ~ide.~c~,e ~~ U o-~.h ~ ~~o urGi~i G~u~ ~' ~ , o~ ~ 5~ C~ o`c-c:wr~ ~ ~u~f'~' ~ /~~ ~ ~ ` ~~ /l~'OY1 ~~ ~~GU~a~li/'-'~~-y`'~ G~L'YLG~~~ lif~G'L~O: l /J/G-~ Ca~r~fo-~~~ ~ /~-~/l~ ~~o-~~. S~ lra~d Duo D~~r2G~,a-~ ~/LGLliG2CcG~~ ~iCl~-/YI .)- ~C~~ ~ev- G~ S ~ ~'-G'P~-=~ ct~ ~ ~~.~' j~ G~~C' • / Sent By: The RAM Prot`essio; 904 731 5465; Jul-7-99 11:52; Page 1 _....... ~.~ .THE R-A-M PROFESSIONAL GROUP, INC. ,,,~ ENGINEERING-PLANNING-ENVIRONMENTAL CONSULTANTS .~..- July 6,' 1999 Mr. Robert S. Kosoy, P.E. Director of Public Works City of Atlantic Beach 1200 Sandpiper Lane Atlantic Beach, Florida 32233 Post-it' Fax Note 7671 Date P~9e9~ To O~ 1~~ ~ ~ ~. From Co.Nept. Co. Phono p Phone W F:1Y ~ Z T 7 '" ~'~~ ~.~ Fax a/ Re: Core City Stormwater and Utilities Improvements Response to Staff Report from City Manager David Thompson R-A-M Project No. 198-021-Oa Dear Bob: Per your request, attached are our responses to the June 9, 1999 staff report forwarded to us from City Manager David Thompson: 7. Concerns for Sherman Creek reconnection: Reconnection of the drainage system tv Sherman Creek is not going tv be an easy task and there are going to be problems, but these problems in our opinion do not make the concept of reconnection impractical. As stated, the aerial photos we used were not up to date but the concept should still work if we can get permission to cross the Fleet Landing property. The reason for illustrating the proposed route is to show that we need to be able to cross the Fleet Landing property at some point. It is agreed that there are questions regarding feasibility and additional modeling will be needed. In order to provide the additional modeling, additional surveying and updated aerial photography will be needed. !t may be feasible to drain to the Fleet Landing Lake but a much larger connection to the Selva Marina Lagoon would need to be constructed and the overflow structure would need to be modified to alloy flow to discharge into Sherman Creek on the north side of Fleet Landing. 2. Use Howell Park and Johansen Park on a limited basis for ovarflow. Using Howell Park and Preben Johansen Park as routes for transporting the flood water through or allowing water to overflow into the park will 4d5b Salisbury Road, Suite 210 -Jacksonville, ~Iorida 32256 (90Q) 296-4440 - FAX (904) 296-4580 Sent By: The RAM Professio; 904 73t 5ne5; JUl-/-yy 71:~t; rage e Mr. Robert S. Kosoy, P.E. Director of Public Works City of Atlantic Beach R-A-M Project No. 198-027-D5 July 6, 1999---------------Page 2 certainly help to increase the level of service and also decrease the cost of piping stormwater around these areas, Preben Johansen Park is already being used in this way by increasing the size of the existing conveyance ditch (see R-A-M PDR page III-2}. Howell Park could be used in a similar manner, but #o accomplish this, the ditch in Howell Park would need to be cleaned out and widened in some areas. The problem of directing water into Howell Park is more difficult than for Preben Johansen Park since the tree cover is very thick on the east side of Howell Park. One route which has been examined is along the south property line of the elementary school. Stormwater from Ahern, First, Second and Third Streets could be routed along Sherry Drive then west through the south parking area of the elementary school over tv Sea Spray Avenue then north along Pine Street and into the Howell Park ditch. Routing the stormwater in this manner co41d significantly reduce the expense for the Howell Park connection although a bypass connection to Plaza will still be required. 3. Do we need automafed flap gales or would manually operated tidal gales be more e1~Cienf use of funds? Automated flap gates or control valves are not necessary for proper operation of the proposed stormwater system. Manually operated controls are sufficient for making changes to the normal operation although automated monitoring of the water levels in the system may be warranted for providing water level status during a storm event and also to provide historic documentation of water levels across the system. 4. The issue of using an inverted crown fype of roadway section for the streets in the cone city area has been examined.and ourrecommendativn is not fo use Phis section for the majority of the cori9 city streets. The inverted crown was considered because the concept of installing the trench for the stormwater piping in the middle of the road was thought to be possibly less damaging to the trees in the core city area, but there are other considerations which must be taken into account which include the following: The existing street typical section has the high point generally in the middle of the street and to construct an inverted crown section Sent 6y: .The RAM Professio; Mr. Robert S. Kosoy, P.E. Director of Public Works City of Atlantic Beach R-A-M Project No. 198-021-05 Juty 6, 1998---------------Page 3 would require the low point to be in the middle of the street and that would require a significant amount of roadway subgrade reconstruction to~have the proper structural support for the roadway. The ETM design included regrading the roadway profile along the streets in the core city area to achieve a more uniform roadway profile, which was going to require complete rebuilding of the streets and damage to must of the trees. The R-A-M concept is to minimize changing the roadway profiles and therefore reduce damage to trees and also reduce costs. In order to properly design the inverted crown roadway the profile would need to be regraded in some areas and therefore costs would t)e increased for these areas. The heavy tree canopy in the core city area is also a major reason for not using the inverted crown section. The inlets for an inverted crown section are located in the center of the roadway and far safety reasons cannot have a large opening at the inlet tv allow far passage of leaves and debris which normally will clog up a grate- type inlet. inverted crowns were never considered as the major type of typical section for the core city area but originally they were considered for some streets. Using this type of cross section viii still be considered during design of the individual streets, but not far the streets which have the large tree canopy at the low end of the street where the stormwater is collecting. The critical aspect of a stormwater design is resolving and addressing known problems and flooding of the streets in these areas. Therefore every consideration must be addressed to assure that the design resolves the problem of flooding in the low areas just east of Sherry Drive which also, has a large tree canopy: Use of inverted crowns in these areas has significant potential for creating more problems, no matter what maintenance efforts are made, rather than resolving the problems and therefore we do not recommend using inverted crowns in these areas. However, we will work with the City's arborist, Mr. Early Piety, on astreet-by-street basis. 5. and 6. EXfllfldtlOR Adding e>d'tltration does not eliminate the need for the Howell Park bypass but adding e~itration along with using Howell Park for overflow ~~ Sent By: the RAM Professio; ~' Mr. Robert S. Kosoy, P.E. Director of Public Works City of Atlantic Beach R-A-IIfI Project No. 198-021-Q5 July fi, 1999---- Page 4 904 731 546; Jul-/-yy i~:~a; rage 4i5 significantly reduce the expense of the Howell Park bypass. Using both the options along with the Sherman Creek connection can achieve the 5- year l_OS. Exfiltration would be a good candidate for phasing in at a future date since it is really not connected directly into the rest of the stormwater system. 7. One-Way Streets for the Core City Area The use of one-way streets could significantly reduce the roadway costs since the roadway pavement, base, and subgrade could be narrower and less impervious surface could potentially reduce the size of stormwater pipes. This wou{d not make a difference in the overall cost of the drainage system, since there would still not be sufficient room along the roadway to use swales for transporting the stormwater as was described in the R-A-M POR {Page IV 3). 8. Using Bypass or Overflow Pipes at the Existing Culverts R-A-M included costs far replacing the entire existing culverts at Plaza, 11th, and the Country Club Bridge but the possibility of using bypasses for overflow pipes will be analyzed. The reason for replacing the existing structure completely was to remove the restrictions which these smaller existing structures represent hydraulically, Installing a bypass or overflow does not remove the restriction completely. However, adding to the structure(s) may be a possibility, and during the detailed design phase, an evaluation will be made as to whether the benefit is worth the expense for each structure. 9. Using an arborist rather than a landscape architect. The R-A-M PDR (Page V-4) recommends the use of an arborist, urban forester, or qualified tree specialist to implement recommendations made. It is R-A-M's preference to place the City's chosen arborist, Mr. Early Piety, ander our contract to assist the team during the next phase of final design and then as an inspector during the construction phase. Our assigned landscape architect will also be engaged within the next phase to assist on matters within his purview. As discussed with City staff, jt is our recommendation to commence the design portion of the effort, with the above scope-refinement being the basis of the final design proposal. We believe that achieving a 5-year LOS for $9s0 million (including construction, enginQering, and permitting) can be acct/ lished. ~~ 07 -- lil/~r~o P~ der Ccm~r~ /ri/CL `O G ~OGt/T/~G 2 y~5. P,~~e r1~ la%f n?° ~S`lo G~ ~eac~-~~ /P/d . ~"~ , OAS>G~cl~.(3 C//GIG ~ /I~a f ~iY~rJ /~/:~ ~// - -- ----- - - --- -- --'" COY1 f~ACf 29 Sent. By: ;he RAM ProTessio; ~, Mr. Roberts. Kosoy, P.E. Director of Public V1/orks City of Atlantic Beach R-A-M Project No.198-021-05 ...July 6,.1999 --..--Page 5 904 731 5465; If you have any questions, please advise. Best personal regards, ~- 7HE R~A-M PROFESSIONAL GROUP, 1NC. ~.. ~' -- Frank E. Gray, Jr., P.E. Principal and Director of Engineering Jul-7-99 11:54; Page 5/5 FEG:Imj