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\M01 �..J <br /> Ir <br /> 'r Soil &Groundwater Excavation Work Plan Advanced Environmental Concepts, Inc. <br /> V <br /> 1.0 INTRODUCTION <br /> This work plan describes the procedures to be employed by Advanced Environmental Concepts,Inc.(AEC) <br /> to excavate gasoline and diesel impacted soil in the vicinity of two gasoline and one diesel underground storage <br /> tanks(UST's)previously removed in 1992. The site is located at 700 West Linne Road, approximately 6 miles <br /> southeast of Tracy, California. Site location is shown on Figure 1. <br /> V <br /> Upon satisfactory excavation of the site,the impacted soil will be transported to a centrally located treatment <br /> area, at the south end of the property. "Clean" fill will be excavated from this treatment area and stockpiled <br /> adjacent to the excavation. The excavated gasoline impacted soil will be shuttled to the treatment area, as <br /> replacement fill, then subsequently landfarmed. The excavation will be backfilled and compacted with a <br /> minimum one foot layer of crushed rock on the floor of the excavation to create a competent bridge, followed <br /> by the clean borrow import. The diesel impacted soil will be treated by applying nutrients and laboratory <br /> �.. formulated microbes to promote bio degradation. <br /> This work plan has been authorized by Mr. Brian Hauss, Ranch Manager. The San Joaquin County <br /> Environmental Health Division (SJCEHD), represented by Mr. Michael Infurna, is the lead agency for the <br /> project. Providing additional oversight will be the Central Valley Regional Water Quality Control Board <br /> (RWQCB). <br /> 16w 1.1 Purpose <br /> The services described in this work plan have the following objective: <br /> Excavate,stockpile, and remedlate diesel and gasoline impacted soil from the vadose zone; <br /> and remove the hydrocarbon impacted water-bearing zone to the"perching", less permeable <br /> layer. Backfill and compact the excavation,landfarm the hydrocarbon impacted soil. <br /> 1.2 Scope of Services <br /> V <br /> The scope of services described in this work plan include: <br /> 1. Excavate the impacted soil at the two former underground storage tank locations <br /> ` using a track-mounted excavator,or equivalent. Anticipated excavation dimensions <br /> are 70' x 45' x 14' for the gasoline impacted area; and 10' x 10' x 12' in the diesel <br /> impacted area. Actual size of the excavation will be based on field screening criteria <br /> 60 by an AEC geologist, and a mobile analytical laboratory; <br /> 2. Separate.and stockpile clean overburden soil from hydrocarbon impacted soil for <br /> later use as excavation backfill. Criteria for"clean"soil will be PID readings of less <br /> ` than 10 ppm proximal to the gasoline impacted soil, all overburden soil proximal to <br /> the diesel excavation will be considered contaminated because of detection difficulties <br /> associated with diesel and the PID; <br /> +r <br /> 3. Shuttle impacted soil to the centrally located treatment area; <br /> 4. Collect confirmatory soil samples from the floor and sides of the excavations <br /> `W and analyze for total Petroleum Hydrocarbons as gasoline (TPH-g) by EPA method <br /> Project: AEC 97V-1805 1 <br /> w <br /> .ENVIRONMENTAL CONCEPTS WITH DESIGN IN MIND• <br /> � 4400 ASHE ROAD.x206 BAKERSFIELD.CA 93313 8051831-1646 • FAX 8051831-1771 <br />