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BACKGROUND The existing 10-inch sanitary sewer line alignment on Vineyard Avenue was removed and replaced in 2003. A few years after construction, multiple sinkholes were observed along this sewer trench due to settlement from trench backfill. The 15-foot depth of the trench contributed to the problem of settlement of the backfill. The original sinkholes were repaired by open trench in 2006. Additional sinkholes were repaired through compaction grouting in 2008 and 2012 by TPGC. However, the sinkholes on the remaining unrepaired areas along this sewer line alignment continue to develop the same failure characteristic as the repaired sinkholes. This project will provide long-term trench failure prevention of the remaining sewer line alignment on Vineyard Avenue, from Sauterne Way to Clara Lane, by filling the voids with grout. DISCUSSION This project consists of stabilizing approximately 1,150 linear feet of sewer trench on Vineyard Avenue, from Sauterne Way to Clara Lane, by a compaction grouting method. Budget The estimated total expenditure for this project is $189,055, including a construction contingency of approximately 15 percent of the construction contract ($23,355) and construction services ($10,000). See Attachment 1 for a funding and expenditure summary. Staff recommends the transfer of a total of $39,055 from CIP No. 17202 to complete the funding for this project. Bids Sealed bids for this project were opened on November 20, 2018. There were five (5) bids received, with bid amounts ranging from $155,700 to $239,000. The low bid amount is approximately 37 percent lower than the Engineer's Estimate of $245,800 (see Attachment 2). There is a discrepancy and an omission in the bid proposal submitted by the apparent lowest bidder, TPGC. However, the City reserves the right to waive inconsequential omissions or discrepancies in any bid as stated in the "Notice to Bidders: Rejection of Bids." The discrepancy is that the bid proposal forms were all included with the bid submittal, but were removed from the bound bid documents. Since this discrepancy does not materially affect the bid nor give the low bidder an unfair advantage, staff believes it is appropriate to waive the discrepancy. The bidder also omitted a signature on the bid proposal form, but all other required documents, including the bid bond, were signed. Again, staff believes it is appropriate to waive this inconsequential omission for the same reason as stated in the "Notice to Bidders." Therefore, the bid was determined to be responsible and responsive. TPGC successfully completed the previous two projects on Vineyard Avenue for the City in 2008 and 2012. Past work performed by TPGC was verified to be satisfactory. Staff recommends award of the construction contract to the lowest responsible bidder, The Pressure Grout Company for $155,700. Page 2 of 3