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work area by placing signs, barricades, and/or yellow tape as necessary. The size and the shape of the exclusion zone will be determined by the site conditions; it will be large enough to include the potentially hazardous zone around the sites. Contractor will place yellow caution barricade tape around the excavation areas any time the work area is left unattended and until the excavation is backfilled to its original ground surface level. Equipment and materials will be stored inside the barricaded area to secure them after hours.No flammable liquid will be stored onsite for safety reasons. Weatherproof warning signs will be attached to the barricade tape in compliance with California Proposition 65 requirements. Identify the location and alignment of underground and overhead utilities and obstacles - This includes contacting Underground Service Alert to complete an underground utility clearance on the public right-of-way. In addition, a subsurface geophysical survey will be performed in the area where the proposed excavation will take place prior to initiating the excavation program. Decommissioning of utilities identified in the area of the proposed excavations is not anticipated in this workplan. If utilities are encountered requiring decommissioning, Contractor will notify the Developer immediatelk 5.3 USTREMOVAL PROCEDURES Underground tanks shall be removed by a qualified, California licensed contractor in accordance with the following requirements: (a)All applicable authorities having jurisdiction shall be notified(SJCEHD and CVRWQCB). (b)A safe workplace shall be maintained throughout the prescribed activities. (c)All flammable and combustible liquids and residues shall be removed from the tank, appurtenances, and piping and shall be properly disposed of. (d) The tank shall be made safe by either purging it of flammable vapors or inerting the potential explosive atmosphere in the tank. Confirmation that the atmosphere in the tank is safe shall be by periodic testing of the atmosphere using a combustible gas indicator, if purging, or an oxygen meter, if inerting. (e) Access to the tank shall be made by careful excavation to the top of the tank. (f)All exposed piping, gauging and tank fixtures, and other appurtenances, including the vent, shall be disconnected and removed. (g)All openings shall be plugged, leaving a `/4"opening to avoid buildup of pressure in the tank. (h) The tank shall be removed from the excavated site and shall be secured against movement. 7