ST. PETERSBURG, Fla. (AP) — The ground-floor pool deck of the oceanfront condominium building that collapsed near Miami was resting on a concrete slab that had “major structural damage” and needed to be extensively repaired, according to a 2018 engineering report that also uncovered “abundant cracking and spalling” of concrete columns, beams and walls in the parking garage.

The report was among a series of documents released by the city of Surfside as rescuers continued to dig Saturday through rubble in an effort to find any of the 156 people who remain unaccounted for after the collapse. At least five people were killed.

While the engineering report from the firm of Morabito Consultants did not warn of imminent danger from the damage — and it is unclear if any of the damage observed was responsible for the collapse — it did note the need for extensive and costly repairs to fix the systemic issues with Champlain Towers South.

The report said the waterproofing under the pool deck had failed and had been improperly laid flat instead of sloped, preventing water from draining off.

“The failed waterproofing is causing major structural damage to the concrete structural slab below these areas. Failure to replaced the waterproofing in the near future will cause the extent of the concrete deterioration to expand exponentially,” the report said.

The firm recommended that the damaged slabs be replaced in what would be a major repair.

Some of the damage to the concrete in the parking garage was minor, while other columns had exposed and deteriorating rebar. It also noted that many of the building’s previous attempts to fix the columns and other damage with epoxy were marred by poor workmanship and were failing.

Beneath the pool deck “where the slab had been epoxy-injected, new cracks were radiating from the originally repaired cracks,” the report said.

These were all problems that should have been dealt with quickly, said Gregg Schlesinger, an attorney specializing in construction defects and a former construction project engineer.

“The building speaks to us. It is telling us we have a serious problem,” Schlesinger said in a telephone interview Saturday about the n