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sb -: 2.1.1 Post-Fire Conditions -' The approximately 50-acre site consists primarily of an abandoned gravel pit. The gravel 3 pit was mined to a maximum depth of 90 feet below the natural grade; the average depth of the pit is estimated to be 50 feet and it has no surface outflows for rainwater. } Remnants of burnt tires, ash, and solidified pyrolytic oil are located throughout the site in clearly identifiable burn piles. The former gravel pit area is predominantly covered with } grasses and patches of shrubs and is easily accessed via existing gravel roads. Based on data from past assessments, impact to soil at the proposed site from contaminants related to the tire fire has occurred. Impact to soil appears to be limited to -' those areas where tires burned and primarily consists of elevated concentrations of metals > (primarily zinc). Contaminated soil and ash and other residual materials such as steel radials and solidified pyrolytic oil will be excavated and disposed to mitigate impacts to -,t groundwater beneath the site and prevent potential impacts to human health. Additional groundwater monitoring is needed to better assess the groundwater Quality at the site. 2.2 Chemical Hazards The potential materials of concern during the remediation activities include: -. 2.2.1 Heavy Metals, including but not limited to Antimony, Arsenic, Cadmium, Lead, Total Chromium and Zinc. } When absorbed into the body, certain heavy metals are toxic. Many are encountered in bulk or solid form and appear Quite harmless, yet the fumes, fine powders/dust or compounds of these metals may be very toxic. In addition, the mechanism of poisoning I from heavy metal exposure is typically independent of the heavy metal. The ions of ,> heavy metals have an extraordinary chemical affinity for sulfur. Hence, when absorbed } into the bloodstream, they seek out and combine with the sulfur present in certain of the body's cellular fluids. In particular, heavy metals tend to alter enzymatic and protein y action in the body. Antimony Antimony is released to the environment from natural sources and from industry. In ' the air, antimony is attached to very small particles that may stay in the air for many days. Most antimony ends up in soil, where it attaches strongly to particles that contain _. iron, manganese, or aluminum. Antimony is found at low levels in some rivers, lakes and streams. Because antimony is found naturally in the environment, the general population is exposed to low levels of it every day, primarily in food, drinking water, -"' and air. it may be found in air near industries that process or release it, such as , y Sb Environmental Services,LLC© October,2003 California Integrated Waste Management Board -_' Site Specific Health and Safety Plan Page 9 of 62 Tracy Tire Fire Remediation Project J