SJVRWRF Dewatering Building Corrosion Remediation Marc Serna, P.E. September 28, 2017

SJVRWRF Dewatering Building Corrosion Remediation Dewatering Building Roof Plan Building was built in 1990. It is made of block wall with roof metal deck at 22-ft above floor with work area of 4,200-sq.ft Contractor scope-of-work is to re-coat existing roof structural supports and metal decking. Existing coating contains lead. Contractor to protect and allow operation of dewatering equipment during construction. LIMIT OF WORK EXTENT OF PLATFORM / DECKING INSTALLED BY CONTRACTOR EXTENT OF SURFACE PREPARED BY CONTRACTOR

Metal Decking and Structural Support Condition SIGNS OF CORROSION ON STRUCTURAL SUPPORT BEFORE PARTICLE BLASTING SIGNS OF CORROSION METAL DECKING BEFORE PARTICLE BLASTING

Metal Decking After Particle Blasting TEST AREA: METAL DECKING AFTER PARTICLE BLASTING

After Inspection of Applied Epoxy Primer TEST AREA: AFTER SCRAPING OF LIFTED MATERIALS (PUTTY KNIFE TEST FOR ADHESION)

Metal Decking after 1st Layer Epoxy Primer Application TEST AREA: METAL DECKING AFTER 1ST LAYER EPOXY PRIMER COATING AFTER REMOVING ACRYLIC COATING

Beams after 1st Layer Primer Application STRUCTURAL SUPPORT AFTER PARTICLE BLASTING AND 1ST LAYER EPOXY PRIMER APPLICATION

Recommendations Staff recommends 100% removal of acrylic including old primer with lead. Approve and authorize amendment to agreement with Schuler Constructors for an amount of $83,800. Additional appropriation of $125,600 to fund the balance of the change order and expenses through the construction phase of the project for a total project cost of $398,300.

Contact Information Marc Serna, P.E. Director of Engineering (951) 928-3777 x 4461 Email: sernam@emwd.org