Unbalanced Low Bid on a Municipal Trailhead
A city parks department in a fast-growing suburb solicits sealed bids for a 3.2-acre trailhead: a 42-space parking lot, a precast restroom, 1,800 linear feet of asphalt trail, and 2.4 acres of native seeding. The design consultant's engineer's estimate is $2.15 million; the council has appropriated $2.0 million for construction plus an 8% contingency. Bids are opened at $2.31 million, $2.38 million, and $2.62 million. The low bidder's schedule of values is noticeably skewed - mobilization at $310,000 against a $95,000 estimate, clearing and grubbing at $186,000 against $70,000, but native seeding at $41,000 against $96,000 and trail paving at $18 per square yard against $29. Additive alternates were requested: restroom upgrades at $285,000 and irrigation at $140,000; one deductive alternate defers the east parking loop at minus $175,000. The second-lowest bidder has filed a protest alleging the low bid is nonresponsive. The council wants a recommendation in five days.
1. Explain how the low bidder's unit prices function as an unbalanced bid, and why the pattern matters to the city given the alternates and the likelihood of change orders.
Read the worked answer
The pattern is classic unbalancing. Mobilization at $310,000 against a $95,000 estimate is front-loading: it pulls cash forward, before work in place justifies payment. High prices on clearing and grubbing exploit items whose quantities commonly grow once grading is exposed. Low prices on seeding and paving are the mirror image - they get repaid through change orders if quantities rise, and they shrink the credit if the city deletes those items.
That last point is what matters here. The only deductive alternate is the east parking loop, which is mostly paving. At $18/SY the bidder returns very little for deferring it, so the savings the city believed it was buying are partly fictional. Both additive alternates will be priced by the same bidder with the same strategy and should be expected to run high.
Unbalancing alone is not grounds to reject a bid; it is a pricing strategy, and most procurement codes permit it. But it changes the city's risk profile: quantity growth, early payment exposure if the contractor defaults, and a misleading comparison between bidders on base bid alone. The city should evaluate bids on the base plus the alternates it actually intends to exercise, and should demand written justification of the unit prices before award.
2. Recommend a course of action that brings the project within budget, with reasoning and risks for each option you reject.
Read the worked answer
Money available: $2.0 million appropriation plus 8% contingency equals $2.16 million. The base low bid of $2.31 million is $150,000 over. Taking the deductive alternate brings it to $2.135 million - inside the appropriation-plus-contingency figure, but consuming roughly 80% of the contingency before a single change order.
Recommendation: award to the low bidder, if responsible and responsive, on base bid plus the deductive alternate, and decline both additive alternates. Rebidding costs 8 to 12 weeks and the market has just priced the work; the second bid is $70,000 higher; the restroom upgrades and irrigation can become a later phase.
Protect the city before signature. Require a written unit-price justification and convert clearing and grubbing to lump sum or cap the unit price. Issue a firm grading plan to limit quantity growth. Negotiate mobilization down to about 5% of contract or require a performance bond and a fully detailed schedule of values. Rebuild contingency toward 5% through value engineering on paving and furnishings.
Rejecting all bids is defensible only if the council accepts a lost season and pays for rebidding. Do not recommend it while the alternates can close the gap.
3. What must be documented and verified before the council acts, given the pending protest?
Read the worked answer
Build a record that would survive a protest.
Responsiveness is a yes/no checklist: bid bond or proposal guarantee in the correct amount and form, all addenda acknowledged, required certifications and non-collusion affidavit executed, bid delivered on time to the right place. Any deviation must be tested against the code's materiality standard rather than waived informally.
Responsibility is a judgement call and needs evidence: references on comparable public work of similar value and complexity, bonding capacity, financial statements, litigation history, current workload, and - given the prices - whether the contractor can actually perform the earthwork it priced low. Record who called whom and what was said.
On the protest: respond in writing within the code's timeframe, address each stated ground, and keep evaluation committee deliberations separate from the bid analysis. Do not open negotiations with the apparent low bidder while the protest is live; that reads as bad faith. Confirm with the city attorney whether the procurement code permits negotiation absent a failed opening - many do not.
Finally, put the unit-price analysis in the staff report. If the council later approves change orders at inflated prices, the record should show the city understood the risk when it awarded.