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Operations and Maintenance Plan <br /> Neighborhood C,Great Valley Parkway <br /> Mountain House,San Joaquin County,CA <br /> Page 9-2 <br /> The SMP will be reviewed and modified as needed every 5-years to reflect procedural changes, staffing <br /> changes, and changes in Site conditions. <br /> 9.4 SOIL EXCAVATION AND MANAGEMENT PROCEDURES <br /> 9.4.1 Excavation Activities Defined <br /> Soil excavation is defined as any soil removal through any means including shoveling, posthole drilling, <br /> well drilling, trenching, and any other condition defined in Section 9.3. Applicable activities also include <br /> disturbances of vegetation whose roots extend beneath the orange marker fabric. <br /> 9.4.2 Excavation Procedures <br /> During any applicable excavations, appropriate dust control measures will be implemented to minimize <br /> fugitive dust from the Site and ensure public and worker safety. For any impacted soil disturbance <br /> exceeding one acre or in consultation with DTSC,the Air Monitoring Plan described in the RAW will be <br /> employed and action levels will be used to determine whether dust control measures are sufficient. Spray- <br /> applied water will be the primary method of dust control on-Site. Prior to commencement of excavation <br /> activities, excavation areas will be sprayed with enough water to minimize dust generation as necessary. <br /> Water trucks equipped with spray attachments (or appropriate alternatives) will be on-Site during soil <br /> movement activities. If the dust control methods described herein are not sufficient to perform the <br /> removal action, additional methods will be determined and implemented in consultation with DTSC. <br /> 9.4.3 Waste Soil Stockpiling <br /> In the event that impacted waste soil stockpiling is necessary, soil will be temporarily stored at staging <br /> areas until it can be properly disposed of or returned to the encapsulation area. At the staging areas, <br /> excavated soil will be placed inside a designated stockpile area on an impermeable barrier and covered in <br /> an effort to minimize fugitive contaminated soil. The temporary staging area will be in a secured <br /> exclusion zone and spray-applied water will be used as necessary to control any fugitive dust when <br /> contaminated soil is moved. <br /> The temporary staging area will be secured with temporary fencing and properly labeled with signage <br /> until properly disposed of or returned to the encapsulation area. The temporary waste soil storage will not <br /> exceed 30 days after excavation. If storage of waste soil exceeds 30 days after excavation, a permit or <br /> approval from DTSC may be required. <br /> The soil stockpiling process will be monitored to control fugitive dust. During non-excavation hours or at <br /> times when soil stockpiles are inactive, excavated soil stockpiles will be covered with plastic sheeting and <br /> secured. Additional field applications may include installation of a temporary canopy, liner, or other <br /> physical barrier that minimizes movement of materials from the stockpile by wind, water, or other <br /> mechanisms. <br /> 9.4.4 Soil Transportation <br /> The primary mechanism of unwanted contaminant movement is anticipated to be wind-blown fugitive <br /> dust. Appropriate measures will be implemented to ensure contaminant control. Prior to any impacted soil <br /> transport, the material will be moistened adequately to prevent fugitive dust. If impacted waste soil is to <br /> be transported off-Site for disposal,the discharger will submit a transportation plan to DTSC for approval <br /> at least 30 days prior to any work. <br />