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Soil Suitability / Nitrate Loading Study Ernst Property ■ Tracy, CA Irerracon February 21, 2019 revised April 9, 2019 ■ Terracon Project No. NA197000 the septic permits (Section 1.3.1) indicate the site was developed with the existing residence in the mid-1980s. 1.3 Existing and Proposed Septic Tank Usage 1.3.1 Existing On-Site Septic Tank Usage The following permits were available on the EHD website for the site address. Table 2. Summary of On-Site Septic Permits. Leach Tank Size Leach Line Line Seepage Pits, Address Permit# Type Sumps,Filter (Gallons) Quantity Length Beds,Other (Feet) 16327 Diablo Court 85-530 New Install 2,000 5 100 --- 16327 Diablo Court SR0007792 Repair --- 1 90 4'x15'x12' Based on a review of the on-site permit history, in 1985 the site is equipped with a 2,000-gallon septic tank with five 100 foot long leach lines. 1.3.2 Site Specific Permit History Refer to Section 1.3.1. 1.3.3 Discussion of On-Site Septic Tank Repair Based on a review of the repair permit, in 1995 a 90 foot long by three foot wide leach line and a 4 foot wide by 15 foot long by 12 foot deep sump was added to the septic system. Refer to Section 1.3.1. 1.3.4 Existing Septic Tank Usage in the Vicinity In an attempt to determine the septic system density for the vicinity of the site, our office reviewed a recent aerial photograph of the property available from GoogleEarthTM. The vicinity of the site consists of vacant land and residences. The assumption was made that each building/cluster of buildings has one septic system. Using this method, we determined there are approximately 50+ septic systems within 0.25 miles of the site. Refer to Section 1.3.5 for a history of septic permits adjoining the site. 1.3.5 Septic Permit History in the Vicinity The following table is a summary of septic permits available on the EHD website for properties adjacent to the site: Responsive■ Resourceful ■ Reliable 5