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HomeMy WebLinkAboutItem 11 PPP 07-01-2020 Ops Comm_P2-98A Covers Sole Source =� Sole Source 1 - for Primary Clarifier 16 a�r ! Covers A-Side Primary Clarifiers Replacement at Plant No. 2, Project No. P2-98A Kathy Millea, Director of Engineering �- Operations Committee July 1 , 2020 r o�N. y S A N I r q;,/0� cc .� / iUCTI.YN SAYlR Q /' CN -O h 1[�AC� C A=Side Primary Clarifiers i i IN Replacement at Plant No . 2 Y �11. 4iya�i idth Construction Cost: $132 million l �g3 Advertise for Bids: December 2020 ` Construction Duration: 5 yearsIC ' 77 0ol ZI -. � �I� ,� or-- ���j a-t.- • r Existing Clarifier Dome Cover Diameter 140 feet Height 21 feet i , �� aamu® _ - Operator Access I I21 i 19, ;z - 1 Operator Access 'f I1 ' � t ' r 1 J� ' • f t r ►ttitr.� I 1 .41 Cover Opt 'ion WTI is Geodesic Dome (Conventional) Flat Truss Supported T • Allows staff entry • No staff entry • Larger ventilation rate = • Lower ventilation rate = smaller larger odor control facility odor control facility • Decreased worker exposure to gases or vapors • Hinged panels are required tw a .l W fC Ln oil �.y a� ■ C M `E `t r t 7E r 0 m 1 Od ��• � C +r ■� 2 C M E dw O O ' o 0 9 9 0 0 C' ZA Cover Evaluation -LI • O&M activities and requirements • Operators' visual access to water surface • Ventilation rates with/without required entry • Longer equipment life outside enclosed space • Visited other facilities • Conclusion : • Flat covers offer $52 million savings due to reduced ventilation • Flat covers must offer hinged panels for operator observation %I�K.-0�2 k ..... ole Source Justification0' 7- ML • Request for Information sent to flat cover suppliers • Only Hallsten offers 80-90% of panels to be hinged . • Hallsten has a proven, patented hinged panel. • One supplier only offers 20-30% of panels hinged 1• One supplier offers only raised hatch panels - • Others require panels to be unscrewed and lifted • $5.3 million pricing commitment from Halsten. Verified as reasonable based on pricing of similar installations 11 f irk, i L �t y pl .Rs pr Recommended Actis Adopt Resolution No. OCSD 20-XX entitled , "A Resolution of the Board of Directors of the Orange County Sanitation District, making findings pursuant to Public Contract Code Section 3400 in support of the Sole Source Specification of Hallsten Corporation , manufacturer of Truss Supported Flat Aluminum Covers for A-Side Primary Clarifiers Replacement at Plant No. 2, Project No. P2-98A, as part of Primary Treatment Rehabilitation at Plant No. 2, Project No. P2-9877 . 4JN1 v S A N I rq Troy ` 9 Q t c o -a 90 2 cl/N 7HE ENV\e'o