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PROVEN TECHNOLOGIES AND REMEDIES GUIDANCE-REMEDIATION OF METALS IN SOIL <br /> • Decontamination and tracking pad to thoroughly wash and decontaminate <br /> vehicles before leaving the site; <br /> • Wet sweeping of public thoroughfares; and <br /> • Cause for work stoppage. <br /> The dust mitigation measures and/or engineering controls are intended to ensure that <br /> project activities will not have an adverse impact on the environment or the community. <br /> 7.3.2 Community Air Monitoring <br /> Community air monitoring should be considered for activities occurring near residential <br /> communities, schools, and other sensitive receptors (e.g., elderly or high use <br /> community areas) to ensure that the implementation of the remedy does not pose a <br /> potential threat to off-site receptors. Site-specific risk-based action levels should be <br /> calculated, in consultation with DTSC, and included in the remedy design. <br /> 7.4 EXCAVATION ACTIVITIES <br /> 7.4.1 Safety Standards for Trenching and Excavations <br /> The excavation, design, and restoration plan should address the applicable Cal-OSHA <br /> safety requirements for excavations (Cal. Code Regs., tit. 8, §1540, §1541, §1541.1). <br /> These requirements state that workers exposed to potential cave-ins must be protected <br /> by shoring, sloping, or benching the sides of the excavation, or placing a shield between <br /> the side of the excavation and the work area. These safety standards also provide for <br /> protection of the stability of adjacent structures. Any excavation four feet or deeper <br /> must have adequate means of access/egress every 25 feet of lateral travel from <br /> workers. Excavations greater than four feet deep require testing for hazardous <br /> atmospheres and protection from hazards associated with water accumulation. Entry <br /> into some excavations/ trenches may require a Cal-OSHA permit and compliance with <br /> Cal-OSHA regulations for trenching and excavation. <br /> 7.4.2 Surface Water Control Measures <br /> If there is the potential for rainfall during the excavation activities, the excavation, <br /> design, and restoration plan should address surface water runoff, erosion control, and <br /> sediment control measures. These measures should conform to state and local <br /> requirements and should provide for segregation of surface water runoff from impacted <br /> and non-impacted areas. <br /> 32 <br />