COMPLIANCE INFO_JTD 2/11/26 - Laserfiche WebLink

Home Browse Search

North County Recycling Center and Sanitary Landfill Storm Water Pollution Prevention Plan Page 6 According to the United States Department of Agriculture Natural Resources Conservation Service (NRCS), San Joaquin Sandy Loam (237) and Rocklin Sandy Loam (228) are classified as sandy loam from alluvium derived from granitic rock sources. The Montpellier-Cometa Complex is a coarse sandy loam also derived from alluvium of granitic rock sources. A University of California Berkeley geology resource states that granite is comprised of 11-13% aluminum containing alumina and 2-3% total iron 1. The NRCS information also stated that all of the primary soil types at the North County Landfill are underlain with clay and/or cemented duripan (hardpan), which is substantiated with field observations as reported in the March 2017 Soils Report prepared by Kleinfelder (included in Appendix L). A local research study of soil conditions in vineyards in San Joaquin County2 shows that the North County Landfill is located within Region 3 of the study which includes the soil types San Joaquin, Montpellier, and Cometa. The study reports that the surface layers in Region 3 have minerals consisting of kaolinite, mica, and vermiculite. All of these minerals contain both aluminum and iron. Soil samples collected at the facility confirm these studies and research information. The following are the results of soil testing at the North County Landfill. Table 2.3 Soil Sampling Results Sample Location Drainage Area Aluminum Concentration Iron Concentration Comments Sample from the storm water conveyance swale immediately downstream of the Interim Sedimentation Basin SW-3 18,000 mg/kg (1.8% by weight) 27,000 mg/kg (2.7% by weight) Soil with a texture of sandy loam and a light reddish hue, having no apparent contact with industrial activities. Soil sample was collected from the B or C horizon containing little or no organic material. Sample from the bed of the newly constructed west swale SW-4 16,000 mg/kg (1.6% by weight) 24,000 mg/kg (2.4% by weight) Soil with a texture of sandy loam and a light reddish hue. oil sample was collected from the B or C horizon containing little or no organic material. Freshly exposed soil with no apparent contact with industrial activities. No water had flowed across the surface of the newly constructed swale. Green waste pond floor SW-3 40,000 mg/kg (4% by weight) 47,000 mg/kg (4.7% by weight) Clay texture with a dark gray color. Green waste area drains to this pond. Dye used for wood mulch contains aluminum and iron. However, the dyed wood mulch only had an aluminum concentration of 150 mg/kg and an iron concentration of 6,600 mg/kg. Soil from non-industrial area (NRCS soil type 228) SW-3 and SW-4 7,200 mg/kg (0.72% by weight) 9,100 mg/kg (0.91% by weight) Reddish-brown color, high in organic content. Soil sample was collected in the A horizon, 1 – 3” below the surface. Soil from non-industrial area (NRCS soil type 237) SW-3 and SW-4 7,800 mg/kg (0.78% by weight) 9,300 mg/kg (0.93% by weight) Reddish-brown color, high in organic content. Soil sample was collected in the A horizon, 1 – 3” below the surface. Refer to Appendix L for soil information, data, and studies. 1 https://nature.berkeley.edu/classes/eps2/wisc/granite.html Included in Appendix L of this SWPPP. 2 “Soil-landscape model helps predict potassium supply in vineyards”, Anthony T. O’Geen, Stuart Pettygrove, Randal Southard, Hideomi Minoshima, and Paul S Verdegaal, California Agriculture, Vol. 62, No. 4, October – December 2008, p. 195; http://calag.ucanr.edu/Archive/?article=ca.v062n04p195 Included in Appendix L of this SWPPP.