Treasure Island had Ammunition Bunkers located under the housing of the base which is located on the left side of this map and here is a close up below.
The Baseline survey claimed the Navy destroyed the bunkers before they built housing on the site but the bunkers are still there and the Navy has recovered munitions including a report in 2019 of a Japanese Mortar with over 6 pounds of high Explosive just in that one bomb which just for that one item the required setback for any civilian construction is 180 feet according to 27 CFR § 555.218 – Table of distances for storage of explosive materials. https://www.law.cornell.edu/cfr/text/27/555.218.
The Japanese Mortar Shell was one of many munitions listed in the 2019 report removed and detonated at Travis Air Force Base according to the
FINAL POST-CONSTRUCTION SUMMARY REPORT Non-Time Critical Removal Action for Solid Waste Disposal Areas Westside Drive, Bayside Drive, and North Point Drive, Radiological Characterization, Building Demolition, and Remediation, Installation Restoration Site 12 (Phase III) FORMER NAVAL STATION TREASURE ISLAND SAN FRANCISCO, CALIFORNIA, December 2019, p 4-24