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Former LTS Rentals - 24 July 2012 <br /> 1430 and 1600 South Cherokee Lane, Lodi <br /> analytical sampling, 154 truckloads of impacted soil (about 2,400 cubic yards) was <br /> transported to Forward Landfill in Manteca fordisposal with approximately 1,400 cubic <br /> yards left on site for later treatment. <br /> After collecting sidewall and floor samples within the excavation area, analytical results <br /> indicated that petroleum hydrocarbons were still present within the northern and western <br /> sidewalls and floor of the excavation (see Table 3 for excavation soil analytical results and <br /> Table 4 for stockpile soil analytical results). <br /> A second phase of source removal began on 4 January 2010 beneath the former pump <br /> island and product lines following the removal of a building and communications tower, and <br /> the deactivation of a gas line. Clean overburden was removed and impacted soil was <br /> encountered between 1 and 7 feet I Excavation to depths ranging up to 20 to 38 feet <br /> bgs yielded another 5,000 cubic yards of impacted soil. The impacted soil was stockpiled, <br /> covered with plastic sheeting and stored on the asphalt pavement northeast of the <br /> excavation. <br /> Between the two excavation events, LTS removed approximately 8,800 cubic yards of <br /> petroleum impacted soil. Twenty-five of the twenty-six confirmation soil samples collected <br /> from the sidewalls and floor of the final excavation did not contain petroleum hydrocarbons. <br /> Approximately 2,400 cubic yards of impacted soil was removed off site for landfilling while <br /> about 6,400 cubic yards of impacted soil remained on-site pending remediation. <br /> Partial backfilling of the Phase I and Phase II excavations with clean overburden was <br /> conducted in December 2009 and January 2010. <br /> BIOREMEDIATION OF CONTAMINATED SOIL <br /> To remediate the diesel-impacted stockpile onsite, LTS's consultant MARCOR Environmental <br /> (MARCOR) proposed the inoculation of the stockpile with a biological and nutrient solution to <br /> stimulate biodegradation of petroleum constituents. MARCOR leveled the existing uneven <br /> stockpile and drilled boreholes through it in a grid pattern to facilitate infiltration. A bioreactor <br /> was constructed onsite to provide bacterial bio-solution to the boreholes (infiltration gallery) and <br /> surface applications. Intermittent inoculation o the stockpile with nutrient solution and water to <br /> maintain moisture content was conducted from April through August 2011. Soil sampling was <br /> conducted periodically to gauge the progress of the bioremediation within the stockpile. Initial <br /> soil samples from the stockpile collected in May 2011 contained up to 9,900 ppm diesel (see <br /> Figure 5 and Table 5 for May stockpile soil sample locations and stockpile analytical results). <br /> Final confirmation soil samples indicate the entire stockpile has been remediated below soil <br /> cleanup goal of 100 ppm (see Figure 6 and Table 6 for November stockpile soil sample <br /> locations and stockpile analytical results). Central Valley Water Board staff concurred with <br /> LTS' request to backfill the excavation with the remediated stockpiled soils in November 2011. <br /> Approximately 6,400 tons of diesel-contaminated soil was remediated and used as backfill. <br />