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Foothill Landfill <br />Storm Water Pollution Prevention Plan <br /> <br /> <br /> <br />Page 64 <br /> <br />WGR also performed research <br />concerning the native soils at the <br />facility. According to the United <br />States Department of Agriculture <br />(USDA) Natural Resources <br />Conservation Service (NRCS), <br />soils on site include Keyes- <br />Bellota complex (187), Lithic <br />Xerorthents-Toomes complex <br />(192), Pentz sandy loam (207), <br />and Pentz-Bellota complex <br />(209). These soil types are <br />described as originating from <br />weathered igneous rock types. <br />(Refer to Appendix J for the <br />NRCS soils map and soil <br />reports.) Magma is primarily <br />made up of ten elements, <br />including Silicon (Si), Titanium <br />(Ti), Aluminum (Al), Iron (Fe), <br />Magnesium (Mg), Calcium (Ca), Sodium (Na), Potassium (K), Hydrogen (H) and Oxygen (O). <br />4 A University of California Berkeley geology resource states that granite, an igneous rock, <br />is comprised of 11-13% aluminum containing alumina and 2-3% total iron 5. <br />Furthermore, field reconnaissance identified numerous <br />igneous rocks that were red in color, indicative of high <br />iron content. The sample shown in Figure 24 appears to <br />be a red diorite. Diorite is usually composed of sodium- <br />rich plagioclase with lesser amounts of hornblende and <br />biotite.6 Hornblende and biotite minerals are both <br />comprised of iron. The red color would indicate a higher <br />concentration of iron containing minerals. This specimen <br />is consistent with the Pentz-Bellota soil type in the area <br />where the rock was found. <br />Based on this information, San Joaquin County has <br />proposed a “Natural Background Pollutant Source <br />Demonstration” as described in Section XII.D.2.c of <br />the IGP in the Action Plan submitted on February 7, 2018. A copy of the Level 2 Action <br />Plan and documentation is included in Appendix J. <br /> <br />4 Magma Composition and Igneous Rocks by Dr. James Brophy, Indiana University, http://www.indiana.edu/~volcano/notes/handout2.pdf <br />and https://en.wikipedia.org/wiki/Igneous_rock <br />5 https://nature.berkeley.edu/classes/eps2/wisc/granite.html <br />6 https://geology.com/rocks/diorite.shtml <br />Figure 24 - NRCS Soils Map <br />Figure 25 - Red igneous rock found on site (most likely <br />diorite)