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Four K Farms - 3 - 25 July 2019 <br />A total of approximately 1,500 cubic yards of excavated soil was placed in an elongated <br />stockpile, lined with plastic sheeting, located between two rows of trees in the southern <br />portion of the orchard. The stockpile was kept covered with plastic sheeting during the <br />wet season but was uncovered during the dry season and allowed to aerate. The <br />stockpiled soil was also occasionally turned to promote biodegradation. On 18 April <br />2018, APEX personnel collected four soil samples from each of five representative <br />sections. The samples for each section were composited in the lab and the five <br />composite soil samples were analyzed for benzene, toluene, ethyl bem:ene, xylenes <br />(BTEX) and TPH-d. BTEX constituents were not detected in any of the stockpile <br />samples. As reported in APEX's 30 May 2019 Soil Analytical Results deport, TPH-d <br />was detected in all five samples ranging from 14 mg/kg to 61 mg/kg. <br />Reports and Recommendations: APEX concluded that residual concentrations of diesel <br />left in place are sufficiently low and will not migrate further in the soil due to the clay <br />hardpan that was encountered at approximately 12 feet bgs. APEX al:;o concluded that <br />diesel concentrations in the soil stockpile are sufficiently low and requE!sts to reuse the <br />stockpiled material for road base material on an as needed basis. APE=X is <br />recommending a "No Further Action" for this incident. Diesel concentre tions detected in <br />confirmation samples and stockpile samples are below the Region 2 Regional Water <br />Quality Control Board Tier 1 ESL for diesel of 260 mg/kg, indicating there is no <br />significant risk to human health or the environment. Therefore, Central Valley Water <br />Board staff finds that the diesel -contaminated soil has been remediated to the extent <br />practicable and recommends No Further Action for the diesel release cleanup. <br />