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wood. Structural support: The tank has two integrated concrete support legs and is located on a concrete pad' (reportedly 8 to 10 inches thick), surrounded by a concrete curb (tertiary containment), situated under a canopy, and surrounded by steel bollards (and railing) providing protection from vehicles at the location indicated on Figure 2 in Attachment 1. See also a Photolog in Attachment 1 with detailed pictures of the tank system and foundation. The Frost Line Depth is 0, Air Freezing Index is 0 — 1000, and the Mean Annual Temperature is 55 degrees Fahrenheit; all were derived 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. The concrete pad, integrated curb, recessed sump (associated with the sump table discussed below), and canopy were constructed in the early 1990's according to Holt. The subject tank was moved to its current location upon completion of the Accumulation Area. The tank has a pair of"feet" that span the width of the tank, measuring approximately four inches tall with a width of approximately four inches (contact surface). These feet support the weight of the tank on the concrete. The concrete pad (foundation) appears to be in good condition with no obvious signs or indications of settlement that could lead to failure. During the site visit, Wood did not observe cracks in the concrete beneath the tank supports that would be evidence of loading in excess of the concrete strength. The tank is routinely filled and emptied; the foundation is sufficient to maintain the load of a full tank. This concrete pad extends under the sump table in the form of a recessed sump. The sump table is adequately supported with no signs of differential settlement (stress fractures) in the common foundation under the tank and sump table. The tertiary concrete curb has a few areas where fractures were observed. These cracks continue onto the concrete pad but are hairline (on the pad) at best. The integrity of the containment and foundation are not affected. See Attachment 1 Photolog for further details. 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: Ports on the tank include a primary hard piped 2-inch fill port, a primary 4-inch extraction port with threaded cap (and integral, male, 2-inch, camlock fitting), a 2-inch primary port equipped with a Krueger Sentry at-a-glance oil level gauge (66265.192(k)(6)), a 6-inch primary port equipped with a functional emergency vent, a 2-inch secondary vent port, and a specialized interstitial monitoring leak detection tube (66265.192(k)(4)). ' 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. 1,000 Gal. Waste Oil Tank