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Home My WebLink AboutItem 09 - Train 2 ClarifierMEMO TO: HONORABLE MAYOR AND MEMBERS OF THE CITY COUNCIL FROM: BRUNO RUMBELOW, CITY MANAGER MEETING DATE: FEBRUARY 21, 2023 SUBJECT: TRAIN 2 CLARIFIER REPLACEMENT AND APPROPRIATION ORDINANCE RECOMMENDATION: City Council to consider approving a contract with Alltech Engineering Corporation for the construction of the Train 2 Clarifier replacement project and an ordinance appropriating the funds. FUNDING SOURCE: Upon approval of the above recommendation, funds will be available in the Utility Enterprise Capital Fund in the estimated amount of $2,165,596. BACKGROUND: The WWTP has three trains, each of which can be operated independently of the others. However, during normal operations, two of three trains must be operational. The Train 2 clarifier was constructed in 1986. While ongoing maintenance and repairs have occurred, the clarifier is in need of replacement. The proposed project will replace all the mechanical components leaving only the original concrete basin which will be rehabilitated. On February 15, 2022, City Council approved an engineering services agreement with Providence Engineering in the amount of $325,000 to design new clarifier components for the existing two clarifier basins of the Train 2. Request for Competitive Sealed Proposals was advertised to consider not only the bid process (75% of weight), but also bidder's qualifications (10%), construction experience (10%) and safety record/litigation history (2.5%) and project closeout (2.5%). Bids were opened on February 7, 2022 with 4 bids received as follows: Contractor Bid Amount Score Alltech Engineering Corporation $ 1,940,596 96.5 Felix $ 2,194,620 87.2 Schofield $ 2,277,620 85.0 MH Civil Constructors. $ 2,540,000 74.8 Alltech Engineering Corporation received the highest score. Additionally, staff has had recent experience with Alltech on the Train 1 clarifier and UV disinfection system improvements at the Wastewater Treatment Plant. Staff has also included $225,000 or 11 % in construction related costs [(5% construction contingency, 4% inspection and 2% materials testing ($213,465.56 rounded to 225,000)] . This brings the total construction phase appropriation to $2,165,596. The contractor has 395 calendar days to complete the project after the Notice to Proceed is issued. Staff recommends approval. ORDINANCE NO. 2023-007 AN ORDINANCE OF THE CITY COUNCIL OF THE CITY OF GRAPEVINE, TEXAS, AUTHORIZING THE APPROPRIATION OF $2,165,596 IN THE UTILITY ENTERPRISE CAPITAL FUND; DECLARING AN EMERGENCY AND PROVIDING AN EFFECTIVE DATE WHEREAS, the City Council of the City of Grapevine desires to fund the Train 2 Clarifiers Replacement project; and WHEREAS, funding is available in the Utility Enterprise Capital Fund; and WHEREAS, all constitutional and statutory prerequisites for the approval of this ordinance have been met, including but not limited to the Open Meetings Act and Chapter 211 of the Local Government Code; and WHEREAS, the City Council deems the adoption of this ordinance to be in the best interests of the health, safety, and welfare of the public. NOW THEREFORE, BE IT ORDAINED BY THE CITY COUNCIL OF THE CITY OF GRAPEVINE, TEXAS: Section 1. That all matters stated hereinabove are found to be true and correct and are incorporated herein by reference as if copied in their entirety. Section 2. That the City Council hereby authorizes the appropriation of $2,165,596 in the Utility Enterprise Capital Fund to fund the Train 2 Clarifiers Replacement project. Section 3. That a copy of the revised FY 2022-2023 Annual Budget document shall be kept on file in the office of the City Secretary. Section 4. That the terms and provisions of this ordinance shall be deemed to be severable, and that if the validity of any section, subsection, word, sentence or phrase shall be held to be invalid, it shall not affect the remaining part of this ordinance. Section 5. That the fact that the present ordinances and regulations of the City of Grapevine, Texas, are inadequate to properly safeguard the health, safety, morals, peace and general welfare of the inhabitants of the City of Grapevine, Texas, creates an emergency for the immediate preservation of the public business, property, health, safety and general welfare of the public which requires that this ordinance shall become effective from and after the date of its final passage, and it is accordingly so ordained. PASSED AND APPROVED BY THE CITY COUNCIL OF THE CITY OF GRAPEVINE, TEXAS on this the 21st day of February, 2023. APPROVED: William D. Tate Mayor ATTEST: Tara Brooks City Secretary APPROVED AS TO FORM: Matthew C.G. Boyle City Attorney Ordinance No. 2023-007 2 TO SECONDARY CLARIFIER SPRAY BAR 1"0 TYPE 316 SS GRADE LINE PIPING, TYP FR(16TIINF V NPT SS TEE 24"CRUSHED = INSTALL FLOMATIC STONE OR GRAVEL VALVE 70 AUTO DRAIN 4501SSX OR APPROVED EQUAL 1"0 TYPE 316 SS _ PIPING, TYP FROM WATER pp—Ier�,� SUPPLY 1" NPT SS TEE 1" VALVE IN VALVE BOX POTABLE 1"BURILE DETAIL NOTES PWATER 1 1"PIPING SHOWN FOR EXAMPLE ONLY PIPE SEE DETAIL CONTRACTOR TO FIELD VERIFY PIPE SIZE OF NOTE 2. EXISTING SPRAY BAR AND MATCH EXISTING PIPE SIZE 2. CONTRACTOR TO FIELD VERIFY SIZE AND MATERIAL OF BURIED POTABLE WATER PIPING AND MATCH EXISTING. TOP OF CONCRETE AT WALL ELEVATION m= 565.08 SPRAY BAR AUTO DRAIN DETAIL SEE DETAILS ON SHEET D701 TOP OF WALL ELEVATION = EL 750 WATER SU RFACE ELEVATION = EL 575.25 APPLY GROUT AS INDICATED ON D103 56'-0.. INSIDE DIAMETER CONTROL PANEL * SEE NOTE 1. THIS SHEET CI L ELEVATION W INFLUENT CL ELEVATION = 563 00 CLARIFIER ILLUSTRATIVE SECTION SCALE�IN FEET TRAIN 1 CLARIFIER - EXISTING CLARIFIER WALKWAY NOTES 1. MATCH PROPOSED ELECTRICAL CONDUIT FOR TRAIN 2 TO EXISTING TRAIN 1 ELECTRICAL CONDUIT. EXIST 10" DRAIN LINE TO BE ABANDONED IN PLACE — NOTES 1. CONNECTION DETAILS TO BE PROVIDED BY CLARIFIER MANUFACTURER. CONTRACTOR SHALL FIELD VERIFY ALL DIMENSIONS AND COORDINATE MATH CLARIFIER MFR PRIOR TO FABRICATION 2 THE ACCESS STAIRS AND BRIDGE FOR CLARIFIER NO 2 SHALL BE LOCATED MIRROR CONNECT TO NEW IMAGE OF CLARIFIER NO I, OFFSET APPROXIMATELY 45 DEGREES NORTHWEST OF POTABLE WATER EXISTING LADDER ACCESS EXTENSION SEE NOTE 6, D103 3. ITEMS DESIGNATED WTH AN- TO BE PROVIDED BY THE CLARIFIER MANUFACTURER 4 EXISTING ELECTRICAL CONDUIT AND POTABLE WATER PIPING SHALL BE EXTENDED TO SPRAY BAR AUTO THE LOCATION OF THE NEWWALKWAY AND RECONNECTED TO THE EXISTING DRAIN SEE DETAIL COMPONENTS ON THE WALKWAY CONTRACTOR SHALL FIELD VERIFY SIZE OF CONDUIT THIS SHEET. AND SIZE AND MATERIAL OF PIPING AND MATCH EXISTING. COORDINATE MATH OWNER CONCRETE FOR SUPPORT LOCATIONS AND DETAILS. FOOTING SEE DETAIL S. SPRAY BAR DIA.TO MATCH EXISTING. SPRAY BAR MATERIAL TO BE 316 SS. NOZZLE SHEET D701 LOCATION AND SIZE TO MATCH EXISTING SPRAY BAR TO BE SLOPED AWAY FROM CENTER OF CLARIFIER TO ALLOW FOR DRAINAGE OF SYSTEM TO THE AUTO DRAIN CONTRACTOR TO SUPPORT STAINLESS STEEL PIPING TO WALKWAY AS NECESSARY. 6. THE SPRAY NOZZLES SHALL BE OF ONE-PIECE CONSTRUCTION AND SHALL HAVE A CLEAR OPENING WHICH IS NOT LESS THAN ONE -QUARTER INCH IN DIAMETER AT THE SMALLEST POINT WHILE IN OPERATION. EACH NOZZLE SHALL BE CAPABLE OF DELIVERING 2.5 GALLONS PER MINUTE OF NON -ATOMIZED LIQUID IN A FLAT, UNIFORMLY -DISTRIBUTED PATTERN WATHIN A SPRAY ANGLE OF NOT LESS THAN ONE HUNDRED -FIVE DEGREES. 7. INSTALL EFFLUENT WEIR PLATE AND SCUM BAFFLE TO MATCH ELEVATIONS DETERMINED IN RPLS SURVEY. k L Z K Q 0' F W U W � N U N W H Z 11 W 0-' > as 0 QKa S N F 3N IQZL O 0 Q2 y f a U a oxnnm av� IK .—TID NWl 2201 -.T—.. 210004 D104 SHEET 14 OF 15 n ) v Aie THESE DOCUMENTS ARE ISSUED FOR INTERIM •°f, REEW ONLYANDARE VI y ! A� PROVENANCE NOT INTENDED FOR T (�' � ENGINEERING CONSTRUCTION, TEXAS nom•ane•wmwalro,r�e.�^� BIDDING, OR PERMIT PURPOSES cM^• °`� asx�05� VERIFY SCALE AW bcALEAcwR1— e,�atos,sa uxwene«i n z:. ¢,�.�as,,,, . w«. o,orei•�—' m^ z� $ SHEETTITLE ^ U J m o m TRAIN 2 CLARIFIER PERSPECTIVE VIEW y m PROJTITLE ECT o mCITY OF GRAPEVINE O u gq S'o PEACH ST. WWTP TRAIN 2 CLARIFIER REPLACEMENT