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that exceeded 100 mg/kg were OS -B@11' and OS -G@12.5' with concE.,ntrations of 240 mg/kg and 252 mg/kg, respectively. These concentrations are below the Region 2 Regional Water Quality Control Board Tier 1 Environmental Screening Level (ESL) for c iesel of 260 mg/kg. 5. Subsequent to completion of excavation and confirmation soil sampling activities, the excavations were backfilled with clean fill dirt. On 11 May 2015, groundwater samples were collected from the two onsite domestic wells and analyzed for TPH-d. Depth to groundwater was reported to be approximately 22 feet bgs. TPH-d was not detectec in either groundwater sample. 6. A total of approximately 1,500 cubic yards of excavated soil was pla -,ed in an elongated stockpile, lined with plastic sheeting, located between two rows of trees in the southern portion of the orchard. The stockpile was kept covered with plastic sheeting during the wet season but was uncovered during the dry season and allowed to aerate. The stockpiled soil was also occasionally turned to promote biodegradation. On 18 April 2018, APEX, personnel collected four soil samples from each of five representative sections. The samples for each section were composited in the lab and the five composite soil samples were analyzed for benzene, toluene, ethylbenzene, xylenes (BTEX) and TPH-d. BTEX constituents were not detected in any of the stockpile samples. As reported in APEX's 30 May 2019 Soil Analytical Results Report, TPH-d was detected in all five samples ranging from 14 mg/kg :o 61 mg/kg. 7. A 13 July 2015 Diesel Tank Failure, Soil Excavation, and Confirmatian Soil Sampling Results Report documents the cleanup and requests a No Further Action. The report concludes that residual concentrations of diesel left in place are sufficiently low and will not migrate further in the soil due to the clay hardpan that was encountered at approximately 12 feet bgs. Based on the relatively low levels of diesel constituents detected in the confirmation soil samples, Central Valley Water Board staff finds that the diesel -contaminated soil has been remediated to the extent practicable and recommends No Further Action for the diesel release cleanup. Public Comment Period: 1 August 2019 through 31 August 2019 FOR MORE INFORMATION Additional information is available on the State Water Resources Control Board Geotracker website at http://geotracker.waterboards.ca.gov/ and the case file, which is available for review at the Central Valley Water Board office in Rancho Cordova. To make an appointment for a file review, please call (916) 464-3291. Please contact Kyle Cockerham with the Central Valley Water Board if you have any comments/questions regarding the Four K Farms release, the cleanup activities at the site, or any of the information in this Fact Sheet: Kyle Cockerham Central Valley Regional Water Quality Control Board 11020 Sun Center Drive, Suite 200 Rancho Cordova, CA 95670 (916) 464-4811 K_yle.Cockerham(a-)-waterboards.ca.gov