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30 July 2018 AdvancedGeo <br /> AGE Project No. 18-4357 Environmental <br /> Page 3 of 5 <br /> • Report preparation. <br /> Each of these tasks is described in greater detail below. <br /> 4.1. PRE-FIELD WORK ACTIVITIES <br /> Applicable site assessment approval will be obtained from the SJCEHD. A general utility <br /> clearance will be conducted with USA North. In addition, a health and safety plan will be <br /> updated in accordance with Occupational Safety and Health Guidance Manual for <br /> Hazardous Waste Site Activities (National Institute for Occupational Safety and Health <br /> Administration, U.S. Coast Guard and U.S. Environmental Protection Agency, 1985). <br /> Prior to mobilization, each proposed soil investigation location will be clearly marked and <br /> a utility clearance obtained through Underground Service Alert. If required a Geophysical <br /> survey maybe conducted to evaluate subsurface utilities. <br /> 4.2. SOIL TRENCHING AND SAMPLE COLLECTION <br /> AGE proposes to establish/excavate a total of six (6) trenches or potholes surrounding <br /> sample S-1 and the former used oil filter and waste oil recovery storage area at the site <br /> to assess the lateral and vertical extent of impacted soil. Trenching will be performed <br /> utilizing a backhoe or similar excavator. The trenches are proposed to be 18-24 inches <br /> wide, approximately five feet deep and approximately 3-5 feet long. Proposed trenching <br /> locations are depicted in Figure 1. <br /> During trenching activities, soil samples will be collected at approximately two (2) feet and <br /> five (5) feet bsg. Soil samples will be collected out of the backhoe or excavator bucket <br /> using a metric soil sampling slide hammer loaded with a pre-cleaned steel sample sleeve. <br /> Appropriately sealed and labeled samples will be placed in a chilled container under ice <br /> and transported under chain-of-custody procedure to a California Department of Public <br /> Health (CDPH)-certified laboratory for analysis of the chemicals listed in Section 3.4. <br /> Each sample sleeve will be labeled with trench designation, depth, time, date and <br /> sampler's initials. Soils encountered in the trenches will be visually classified by AGE <br /> personnel in accordance with the USCS and field-screened for the presence of volatile <br /> organic compounds using an an organic vapor meter (OVM). AGE field staff may modify <br /> individual sampling locations based on site-specific field conditions (obstructions, visible <br /> signs of contaminated soils or other factors). <br /> Excavated materials will be stockpiled at the surface next to each trench pending the <br /> receipt of analytical results. Based on the analytical results the trenches will either be <br /> backfilled with the excavated materials or further actions will be determined as needed. <br /> If hazardous waste is encountered based on laboratory analysis, waste will be stockpiled <br /> on plastic (10 mil) sheeting for evaluation and disposed at an appropriate landfill. A profile <br /> for hazardous waste disposal will be prepared and the effected media will be transported <br /> to an appropriately permitted disposal facility. <br />