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wood. inhibitors are present in the resin. The material handled in the operation of the waste antifreeze tank, i.e., waste antifreeze, is generally non-corrosive to rubber hoses and plastics. Structural support: The subject antifreeze tank is anchored to a concrete pad' (reportedly 8 to 10 inches thick) that was in place prior to the placement of the tank back in 2011. The weight of a full tank is distributed over the entire tank base. Based upon the construction information provided by Holt to Wood, the concrete foundation is sufficient to support the weight of a full tank. This tank is restrained by means of seismic anchors interconnected to braided steel wire rope that wraps around and over the top of the tank. Details of the seismic restraint system are provided elsewhere in this document. Double wall tank construction encloses and interlocks the outer and inner tank to prevent rain and debris from entering the outer containment. The outer containment tank bottom has integral 4-inch-high forklift channels made of the HDLPE resin. The outer containment tank rests on a concrete slab adjacent to a compressor shed at the location indicated on Attachment 1, Figure 1. The Frost Line Depth is 0; Air Freezing Index is 0 — 1000; and the Mean Annual Temperature is 55 degrees Fahrenheit; all are from the California Residential Code specific to San Joaquin County.2 Thus, 0 inches below undisturbed soil would be the requirement to avoid frost heave. Frost heave is not an issue at the site requiring mitigation. No part of the tank system (i.e., external metal component) is or will be in contact with soil or water (66265.192(a)(3)); thus, no external corrosion protection is needed to ensure the integrity of the system. Other identifying features: The tank top has a threaded, 14-inch diameter, black, plastic lid (manway) with an inner 5-inch vented cap. Antifreeze is not categorized as a combustible liquid, although there is a slight to moderate fire hazard when exposed to high heat or flame (auto- ignition temperature of engine coolant is 750 °F). Although antifreeze exhibits a flammability hazard when exposed to high heat, ignition of Per email from Mike Mason of Holt of California to Greg Meyer that occurred on May 1, 2020, the best information available regarding the construction of the concrete pad is that the concrete is between 8 inches and 10 inches in thickness. 2 http://www.slaov.org/commdev/cqi- bin/cdyn.exe/file/Building%2FBuilding%2FCLIMATIC%20AND%20GEOGRAPHIC%20DESIGN% 20CRITERIA.pdf Wood Environment & Infrastructure Solutions, Inc. 275 Gal. Waste Antifreeze Tank