Little Patuxent WRP 8 th Addition - Biosolids Processing Facilities Improvements

Transcription

1 Little Patuxent WRP 8 th Addition - Biosolids Processing Facilities Improvements CMAA Presentation April 19, HDR, Inc., all rights reserved.

2 Introductions Joshua Gliptis, P.E. Howard County Bureau of Utilities Project Manager Brian Balchunas, P.E., BCEE HDR Project Manager David Hill, DBIA Clark Construction Construction Executive

3 Agenda Project purpose, background o Existing Treatment Plant and Processes o Master Plan o PER Choosing CMAR Delivery Selection Process CMAR Mechanics and Results o Design Collaboration and Innovation o GMP Development o Collaboration o Project Scope Refined Final Design Current Project Status

4 Project Objective: Design and construct a reliable, cost-effective, and socially responsible treatment facility resulting in beneficial use of LPWRP biosolids in Maryland, for a changing and unpredictable regulatory environment. Little Patuxent WRP Mission Statement: Provide environmentally responsible, reliable and cost effective water reclamation services to Howard County.

5 Project Purpose and Background

6 Existing Little Patuxent WRP

7 Existing LPWRP Solids Process RDP advanced alkaline stabilization process for Class A EQ biosolids (dewatered cake) Primary Clarifiers Centrifuge Dewatering Lime Solids Screening Gravity Thickener Thickened Primary Solids Storage Heat Secondary Clarifiers RDP Process DAF Thickeners Thickened WAS Storage To Land Application

8 2013 Biosolids Master Planning Develop a Biosolids Master Plan that provides a framework for reliable, cost-effective, and socially responsible treatment and beneficial use of LPWRP biosolids in a changing and unpredictable regulatory environment. Evolving regulations for agricultural land application o Winter land application ban o Phosphorus Management Tool More versatile biosolids product desired (i.e., useable in various markets) Biosolids volume reduction Workplace environment challenges with corrosive and dusty lime stabilization process

9 Master Planning Recommendation Replace RDP with anaerobic digestion and heat drying Anaerobic Digestion Dewatering Heat Drying Versatile Class A EQ product, multiple end-uses Volume reduction Relative cost Reliability Manageable process complexity Greatly improved work environment Reduced chemical costs (no lime!) Class A Biosolids

10 2014 Preliminary Engineering Report Bridging Document Solids thickening and storage improvements Digester configuration o Repurpose two existing pretreatment reactors, add third new digester o Risk: Constructabililty issues and site impacts Additional nutrient management o P: Struvite control with chemical addition o N: Centrate treatment - Deammonification o Risk: relatively new technologies and limited vendors Dryer options rotary drum or belt o Belt dryers selected less complex, lower operations and maintenance demands o Risk: relatively new and nearly unprecedented size of units; Site constraints

11 Choosing Delivery by Construction Manager at Risk (CMAR)

12 CMAR Delivery Why Do It? What are the Benefits? Complexity of Project o Maintenance of Plant Operations o Site Constraints o Innovative technology selection and procurement Speed in delivery Manage Risk Eliminate Exhaustive/Defensive Engineering Collaboration o Selection of most qualified team o Selection of key equipment and vendors Price Certainty o Estimates done by Contractor at each milestone o Guaranteed Maximum Price established (GMP) Schedule Certainty

13 Howard County Selection Process

14 Engineer and CMAR Solicitations Both follow Howard County s Quality Based Selection process o Expressions of Interest o Technical Proposals (Top 3-4) o Interviews o Consider Compensation for Proposals and Interviews County develops solicitation for Engineer o Issued summer 2015 o Under contract October, 2015 County and Engineer (acting as Owner s Rep) Develop Solicitation for CMAR o Issued late 2015 o Under contract March 2016 CMAR Contracts o Pre-construction modeled after County s professional services agreements o Construction modeled after County s construction agreements o Incorporated lessons learned from previous CMAR and DB agreements o EJCDC and DBIA reference documents as resources

15 CMAR Delivery Mechanics and Results

16 CMAR Involved from Early Design Stages Review, comment on Preliminary (30%) and Intermediate (60%) design submittals Other CMAR responsibilities o Early procurement of dryer systems and other major equipment items o Value engineering proposals o Constructability reviews o Site utilization plan o Maintenance of plant operations plan o Schedule Key Milestones» October 2018 Start of Phase I Processes» Working backwards leads to Early and On-Time Delivery of Final Design and GMP1 NTP o Procurement plan o Site Specific Safety Plan

17 GMP Development Estimates completed on each design submittal o Final GMP consistent with original 30% estimate Competitive bids for each of the major bid packages Joint interview and review of bidding companies (Owner, Engineer, CMAR) o Risk assessment o Scope verification o Quality o Understanding of delivery process Meet to review Owner Allowances and CMAR Contingencies o Place risk where it is best controlled Negotiated GMP within three weeks of receiving bids NTP for Phase 1 February, 2017

18 Collaborative Approach Workshops o Identifies the key decisions needed o Facilitates decisions for the owner o Opportunity for top and mid level team members to share ideas Partnering o Promotes High Level PM Discussions o Venue for voicing concerns or highlighting positives o Involve key sub-contractors and vendors Value Engineering BIM Outreach Envision

19 Leads to Results Right scope o Digester configuration and construction methods o Phosphorus removal o Equipment selection Tough decisions o Split Substation and MCC locations (PH1 Design Revision) o Relocate dryer building o Improved operations and site utilization

20 From where we started design STREAM BUFFER PLANT EFFLUENT LINE REPLACE SUBSTATION PS-2 CENTRATE EQUALIZATION WAS THICKENING MODS. CENTRATE TREATMENT DIGESTER NO. 1 DIGESTER BUILDING NO. 1 ADMINISTRATION BUILDING ADDITION MODIFIED GARAGE DIGESTER BUILDING NO. 2 DIGESTER NO. 2 DIGESTER NO. 3 DEWATERING AND DRYING BUILDING ODOR CONTROL BIOFILTERS PRODUCT STORAGE AND TRUCK LOADING DIGESTED SOLIDS STORAGE BOILER BUILDING DIGESTER GAS TREATMENT DIGESTER GAS FLARE NO. 2 WETLAND BUFFER

21 through collaboration the process evolved PHASE 1 REPLACE SUBSTATION PS-2 WAS THICKENING MODS. CENTRATE TREATMENT 1 GRAVITY THICKENERS DIGESTER NO. 1 NEW DIGESTER CONTROL BUILDING PHASE 2 PRIMARY SOLIDS SCREENING 2 DIGESTER NO. 2 DIGESTER NO. 3 DEWATERING AND DRYING BUILDING PHOSPHORUS PRECIP. BIOGAS FLARE ODOR CONTROL BIOFILTERS PRODUCT STORAGE AND TRUCK LOADING DIGESTED SOLIDS STORAGE THICKENED SOLIDS STORAGE DIGESTER GAS TREATMENT

22 to where we are today

23 Final Design Finalized digester configuration o Three new digesters for improved performance, operations Phosphorus precipitation for struvite management Deammonification process selection for centrate treatment Belt dryer pre-selection

24 LPWRP Biosolids Improvements Primary Clarifiers Centrifuge Dewatering Solids Screening Gravity Thickener Anaerobic Digesters Phosphorus Precipitation Belt Dryer Secondary Clarifiers Product Storage GBT Thickened Solids Storage (to plant drain) Centrate Treatment Digested Solids Storage To Customer

25 Project Status

26 Project Status and Schedule Phase 1 o NTP February 2017 o Digester construction to begin June 2017 o Digester start-up July 2018 o Remainder of construction through early 2019 Phase 2 o Preliminary Design submittal April 2017 o Intermediate Design submittal July 2017 o GMP Contract Documents September 2017 o GMP negotiations through December 2017 o Construction to mid 2020