Laserfiche WebLink
lierracon Soil Suitability / Nitrate Loading Study <br />Azevedo Property Acampo, CA <br />June 19, 2019 Terracon Project No. NA197009 <br />analysis. Sample GW-1 was collected into a clean unpreserved plastic 125 milliliter (ml) bottle <br />and analyzed for nitrate as N by EPA Extraction Method E300.1. Sample GW-2 was collected into <br />two clean glass 40 ml VOAs preserved with ascorbic and meleic acid and analyzed for DBCP <br />(1,2-Dibromo-3-chloropropane) by EPA Extraction Method E524.3. Nitrate as N was reported at <br />2.4 mg/L in groundwater sample GW-1 below the MCL of 10 mg/L-N. Groundwater sample GW- <br />2 reported below laboratory reporting limits of 0.010 micrograms per liter (ug/L) for DBCP. <br />- <br />1.4.4 Groundwater Sample Analysis <br />Refer to Section 1.4.3. <br />1.4.5 Groundwater Sample Handling <br />Refer to Section 1.4.3. <br />1.5 Soil Profile and Geologic Information <br />The site is depicted on the Geologic Map of California 2010, as within generalized quaternary <br />Pleistocene and Holocene deposits which are comprised primarily of unconsolidated and semi- <br />consolidated alluvium, lake, playa, and terrace deposits. <br />Terracon reviewed the United States Department of Agriculture (USDA) Natural Resources <br />Conversation Service (NRCS) Web Soil Survey for information regarding soil properties. Based <br />on information obtained from the USDA sources, the site consists of the following soil types. <br />Table 3. <br />USDA Soil Types. <br />Map Symbol Name Percent of Site Location <br />111 Bruella sandy loam 32% Northern portion and southwest <br />corner <br />240 San Joaquin loam, thick <br />surface <br />68% Located on the northern, central and <br />southeastern corner <br />Based on the USDA soil map, the proposed septic system will be developed within San Joaquin <br />loam soils. According to the USDA Soil Survey of San Joaquin County (1992), San Joaquin loam <br />soils consist of moderately well drained soils with 0 to 2 percent slopes. Typical soil profiles <br />consist of 0 to 12 inches pinkish gray loam or brown sandy clay loam in the upper 14 inches, 14 <br />to 23 inches brown clay hardpan, 23 to 60 inches indurated hardpan. Some surface areas may <br />consist of fine sandy loam or sandy loam. The main limititations for this soil type include very slow <br />permeablity and hardpan. For homesites with septic systems, the slow permeability can be <br />overcome by ripping the hardpan and increasing the size of the leachfield. Refer to Section 2.1 <br />for further discussion of the soil information. <br />Responsive Resourceful Reliable 8