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DR9303-AG 930622 (2)_~r'~_. AGENDA REQUEST FORM crrv cot c. rrm n, ,a/ 3 ITEM CAPTION: Discussion and consideration of allocating funds set aside in the Fiscal Year 1992/93 budget for drainage and roadway improvements to participate in the drainage solution at the intersection of Moore Road and Sandy Lake Road and authorizing the City Attorney to prepare a contract for the City's participation in the drainage solution with the owner of the property at the northeast corner of Moore and Sandy Lake at a not to exceed dollar amount to be determined by City Council and authorizing the Mayor to sign. SUBMI'rYED BY: ~,'X. STAFF K~n~ih ur s S City OTHER REP.: DATE: EVALUATION OF ITEM: See attached memo. AMT. +/- BL~DGET FINANCIAL REVIEW B COMMENTS: Certificates of Obligation, Series 1992 included $200,000of which $196,000 is available after cost of isuance of the bonds. LEGAL REYqEW BY: RE%qEWED BY CM' ~ AGENDA REQUEST FOB{ REVISED 2~93 · 'b/ 2 ~,Z= ~C S, L L-ZT. TLZRS / R£~ORTS .' '~ Z'.' S.'.~ T~%"L'ES: '. l.?. CO.N~CT ..................... : 6 oriS/nal~ for mixture C.:.A_~5-: O,~ER$ ....................... · 3 orfSf~,lm for CF~2'.N~NCE ........................... : I blueb~ck for s:l~tur~ + 3 c,~pi~.s C~TZC_~ ............... : I bluebJck for sf4u~Cu~e r n,,'-- 2 blueback~ for a:l&,'~m, tut~ '" i copy ?RCCZ.AEATIO,~ ........................ : 2 blueb~cks foe siC;nature + , cop,~ LOCATiO~ PAPS ....................... : 12 ZONING PL/~S :... 12 F~[LI,MINAP, YiFINAL PI.A~$ ............. : SITE PLAWS .......................... : 12 LAN~CA.PE PLANS ..................... : 12 ARCHIT£CTt~J~, REIk'DERI~GS ............ : 12 ~AIE PL~LISBED IN THE CITIZEIIS'ADVOCATE: NOTIFICATION TO: - DAT£/METIiOD SF COOl'ACT: NCTES MEMORANDL~I To: Mayor and City Council From: Kenneth M. Griffin, P.E., City Engineer Date: June 22, 1993 RE: Discussion and consideration of allocating funds set aside in the Fiscal Year 1992/93 budget for drainage and roadway improvements to participate in the drainage solution at the intersection of Moore Road and Sandy Lake Road and authorizing staff to enter into a contract with the owner of the property at the northeast comer of Moore and Sandy Lake at a not to exceed dollar amount to be determined by City Council. At the February 9, 1993 City Council meeting, information was brought forth concerning the drainage problems associated with the 'Barbara Austin~ property. A copy of my memo to Alan Rafliff is attached. The memo estimates the cost of the drainage solution to be in the range of $240,000. The City of Coppell Engineering staff has designed the drainage solution for this problem. The solution involves approximately 1350 linear feet of 66~ RCP, 166 feet of 6x4 box culvert, the addition of a 48" RCP beneath Moore Road and the construction of various inlets and manholes to accommodate the drainage coming south of Sandy Lake down Moore Road. The engineering design has been provided to Bill Anderson of Dan Dowdey and Associates. Mr. Anderson was provided the design because he is currently working on the onsite improvements on Barbara Austin's property and the design of Moore Road. Once the design was completed and an actual material take off was generated, the construction cost of the project was estimated to be $260,000. During the design of the drainage solution, the actual drainage basin itself was reevaluated considering area and run-off coefficients. Based on the detailed design of the drainage solution, the estimated run-off from the developed 81.5 acres south of Ms. Austin's property is 372 CFS. Based on the detailed analysis of the situation and on the previous analogy used to arrive at the City's participation, the City's participation would be as follows: Undeveloped Developed Barbara City's Runoff Runoff Austin's Share Share 187 CFS 372 CFS 50.3% 49.7% Under this analysis, the City's share would be $129,220.00. Previously, on a consensus vote, the City Council had authorized an amount not to exceed $110,000. The increase in the total cost of the project and the increase in the proposed City's share is allocated to two areas: 1) During the actual design and analysis of the drainage along this area, particularly in the channel area, it was noted that discharging the water directly into the existing channel on the west side of Moore Road could possibly create some drainage problems for the existing drainage structures that outfail into the channel, most notably at the intersection of Stringfellow and Nixon. Upon the evaluation of the hydraulics of the channel and the existing 3-60' RCP's that ouffall into the lake on the east side, it was determined that an additional pipe should be constructed beneath Moore Road. Based on my calculations the additional pipe should be a 48' diameter RCP. The estimated cost for the construction of the additional 48" RCP is in the range of approximately $20,000. 2) The additional increase in the City's percentage share is also due to refining of the run-off coefficient from the south side of Moore Road. The area of the school property and the fire station property have a higher run-off coefficient than the residential areas. Based on the above two factors, the cost of the project and the City's participation increased from the original percentage concept presented to City Council. This agenda item is brought forth to obtain approval to enter into a contract with the owner of the property to participate in the cost of the drainage solution in a ~not to exceed" amount so that Mrs. Austin can close on the property no later than June 25th, 1993. Prior to closing, she has indicatetl that she needs a firm commitment on the City's participation in the drainage solution. Staff is seeking direction from the City Council on this issue and will be available to answer any questions at the Council meeting. MOORE ROAD DRAE~IAGE PROJECT DR 93-03 ITEM DESCRIPTION EST. OUANITY UNIT TOTAL 1 66" RCP 1350 L.F. 120.00 162,000.00 2 6'x4' Box Culvert 166 L.F. 150.00 24,900.00 3 54" RCP 20 L.F. 100.00 2000.00 4 48" RCP 178 L.F. 80.00 14,240.00 5 30" RCP 6 L.F. 50.00 300.00 6 18" RCP 6 L.F. 40.00 240.00 7 10' Inlet 2 EACH 2000.00 4000.00 8 Type 'C' Headwall 2 EACH 3000.00 6000.00 9 Channel Work for 48" RCP L.S. 5000.00 5000.00 10 Conn. 48" RCP to Headwall 1 EACH 3000.00 3000.00 11 Conn. 6x4 Box to Channel 1 EACH 3000.00 3000.00 12 Conn. 21" RCP to 48"RCP 1 EACH 2000.00 2000.00 13 Rem. & Repl. Conc. Flume I EACH 2000.00 2000.00 14 Rem. & Repl. Manhole I EACH 5000.00 5000.00 15 Storm Sewer Manhole I EACH 3000.00 3000.00 16 Cut & Plug 18" RCP 2 EACH 500.00 1000.00 17 Cut & Plug Sanitary Sewer 3 EACH 500.00 1500.00 18 Pavement Repair 1380 S.F. 4.00 5520.00 19 Regrade Borrow Ditch 300 C.Y. 10.00 3000.00 ~'4/,/~./.~.~ 5% Contingencies 12,385.00 TOTAL ESTE~IATED COST $ 260.000.00 independent of my numbers, and to provide different percentages if he so chose. It is my opinion that if they go that route, the percentages will be very near what I have calculated. I told Ms. Austin that there were three alternatives at this point in time: 1.) accept the percentages and move forward; 2.) reject the percentages; and 3.) provide an alternative way to calculate the City's participation. I also explained to Ms. Austin that there was not a $200,000 check waiting for her when this drainage solution was resolved. I explained that the Council had only committed up to $200,000 for the solution. Under the percentages that I have proposed, the City's share would be approximately $110,000 (.458 x $240,000). The $240,000 represents the estimated cost for the drainage system. If the drainage is resolved at the time that Ms. Austin develops her proper~y, then the City will benefit not only from the resolution of the drainage, but also from the dedication of right-of-way and the construction of the remainder of Moore Road. Currently, Moore Road has a jog both north and south of Ms. Austin's property. The development of the property would remove the jog and construct the same size street section as currently exists south of Sandy Lake Road. Ms. Austin is faced with three items that need to be resolved. One is the zoning of her proper~y, two is the platting of the property, and three is the resolution of the City's participation in the drainage solution. I indicated to Ms. Austin that quite possibly the approach would be to proceed through City Council to arrive at some type of contractual agreement on the City's part to pa_nicipate in the drainage solution in a percentage of 45.8%, not to exceed the $200,000 that the City has set aside. In essence, it would take a major catastrophe in the construction of the project for the City's share to balloon to $200,000. I would be happy to discuss this meeting and my findings with you at your convenience. ICMG/pn austin.adr To: Alan D. Ratliff, City Manager From: Kenneth M. Griffin, P.E., City Engineer RE: Barbara Austin Drainage Problem Date: February 3, 1993 On February 2, 1993, I met with Barbara Austin, Bill Anderson, and George Gibson, the potential developer of Ms. Austin's property, concerning drainage related issues. At the meeting, I presented a quantifiable approach to determine the participation of both Ms. Austin and the City in the solution to the ongoing drainage problem. Briefly, the drainage problem relates to the development of property south of Ms. Austin's property over a period of the last several years. The development increased the runoff due to street construction, rooftop construction, and storm drainage construction. Ms. Austin previously stated that she did not experience a problem with the drainage through her property until the property south of her developed. The approach I took to address this issue was to look at what the drainage basin was south of Ms. Austin's property prior to development. To determine that, I looked at the USGS topography information flown in 1956 and field verified in 1959. That map shows that there was approximately 65 acres south of Sandy Lake Road that drained through Ms. Austin's property at that point in time. There was also another 9 acres north of Sandy Lake Road that drained through Ms. Austin's property. Therefore, a total of 74 acres of runoff drained through Ms. Austin's property. I then looked at the current drainage basin south of Ms. Austin's property. It appears as though there is about 80 acres south of Sandy Lake Road that drains through Ms. Austin's property. There is not any area north of Sandy Lake that drains through her property due to the construction of Moore Road and Food Lion. In analyzing these drainage basins, I considered the fact that in a developed state, the water moves more quickly through the system and also there is a greater amount of runoff. Therefore, the estimated current runoff from the developed 80 acres south of Ms. Austin's property is 345 cfs. The runoff to Ms. Austin's property, prior to development, was approximately 187 cfs. If you consider that Ms. Austin's responsibility would be to handle all the runoff prior to the development of the property south of her, then her participation in the cost would be 54.2% (187/345). Conversely, the City's participation would be 45.8%. Ms. Austin was not particularly pleased, but I got the feeling that she did understand how I arrived at these percentages. I welcomed Ms. Austin's engineer to analyze the situation, C. Sweanng in of Alternate Cable Review Board Member Margaret Quinn, who was appointed by the Council at the June 8th Council Meeting. Mayor Morton swore in Margaret Quinn as a new member of the Cable Review Board. 10. Consideration and approval of an ordinance amending Chapter 9 of the Code of Ordinances by empowering the City to regulate water wells in the City of Coppell and authorizing the Mayor to sign. After lengthy discussion, it was decided that Councilmember Weaver will work with Steve Goram, Director of Public Works, and bring this item back to the next City Council meeting. No further action was required on this item. 11. Consideration and approval of a Deed Without Warranty to convey land located at the Southwest corner of Andrew Brown Park, West of Denton Tap Road and bordering Cottonwood Creek, totaling 4,454 square feet, to Centex Real Estate Corporation and authorizing the Mayor to sign. This item was pulled at the request of Staff. 12. Discussion and consideration for authorization to enter into a design contract, scope of services and compensation plan with Rady and Associates for the design of Sandy Lake Road from MacArthur Blvd. to Denton Tap Road in the amount of $672,500.00 ($502,500.00 General Fund and $170,000.00 Water Revenue Account) and authorization for the Mayor to sign. Mayor Morton recognized the citizens who were present to support the inclusion of bike trails in the design. Ken Griffin. City Engineer, made a presentation to Council. Mayor Pro Tern Robertson moved to approve the scope of work of services to Rady and Associates for the design of Sandy Lake Road from MacArthur Boulevard to Denton Tap Road not to exceed the amount of $672,500.00, with financing as indicated by the Finance Department, and that the City will receive full credit for any ser¥ices not used, and that Rady and Associates recognize the concerns of the citizen when designing the project. Councilmember Stably seconded the motion; the motion carried 5-0 with Mayor Pro Tem Robert.son and Councilmembers Weaver, Stably, Reitman, and Garrison voting in favor of the motion. 13. Discussion and consideration of allocating funds set aside in the Fiscal Year 1992/93 budget for drainage and roadway improvements to participate in the drainage solution at the intersection of Moore Road and Sandy Lake Road and authorizing the City Attorney to prepare a contract for the City's participation in the drainage solution with the owner of the property at the northeast corner of Moore and Sandy Lake at a 'not to exceed dollar amount" to be determined by City Council. Ken Griffin, City Engineer, made a presentation during Work Session. Ken Griffin briefed the Council on the Texas Water Law'. Mayor Pro Tern Robertson moved to have the City Attorney and City Engineer to draft a contract with Mrs. Austin and bring back to Council with a dollar amount not to exceed $130.000.00. Councilmember Reitman seconded the motion: the motion ,'*ailed 2-3 v. ith Mayor Pro Tem Robertson and Councilmember Rekman voting in favor of the motion: and Counciimembers Weaver, Stahly, and Garrison voting against of the mo:ion. Cot, cci;member Statz. ly requested Staff to provide some history regarding the allocation of funds in this t.~pe of matters. Mayor Morton requested that this item be schedu'·ed for reconsideration at the next Counci~ Meeting. Barbara Austin discussed this matter with the Council. CM062293 Page 3 of 7 PLEASE INCLUDE THESE ITEMS IN THE EXECUTIVE SESSION SECTION OF TIlE Feb~.t~' 9 · lq03 COUNCIL MEETING AS INDICATED ~month~ t da.,, I BEI.©~. EXECL II~E SESSION A A~cie 6252-1-. Section 2 fei. and Senate Concur~nt Resolution Number 83. d~scussion '*:th C~ty Attorne.'. concerning matter involving privileged ]~arbara A]lntin - I.and Acq~fi~ition ~Please red,cate ff the~ are backup documents to be placed behind item) B -xnicle 6252-i-. Section 2, D. d~scussion v. ith respect to the purchase, exchange. lease· or ~a;ue cf real propert.x i. Barbara Atmtin - land Acquisition & Drainage Ilmues 2. 3. · Please indicate if there, are backup documen~ to be place~d behind item) C. A.~icle 6252-17. Section 2 Cg) discussion concerning personnel. 2. 3. 4. (Plea.~ indic..m if there ~re badmp doeum~nu to b¢ pla~d Imhind iron) EXECSES.FRM SOLUTION TO MS. AUSTIN'S DRAINAGE PROBLEM Approach to arrive at percentages was to compare runoff prior to development with runoff after development Undeveloped Developed Barbara City's Runoff (CFS~ Runoff (CFS) Austin's Share Share 187 cfs 345 cfs 187/345 = 54.2% 45.8%