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3.7 Description of proposed or expected maximum (including second unit dwellings) septic tank usage on site: At a maximum, each parcel will have 6 duplexes. Each duplex will have its own 4000 gallon septic tank and leach field. Each leach field is proposed to have three 40 foot leach lines followed by two five foot diameter pits in series on each line. The pits in series will be separated by 5 feet of leach line for a total leach line equivalence of 624 feet per duplex (See Attached Site Plan). All septic systems will conform to San Joaquin County Standards and will be constructed under a permit. 4.0 GROUNDWATER INFORMATION SECTION 4.1 Description of the depth and gradient of groundwater in the general area: The depth to ground water in this area is approximately 80 feet according to the map of "Lines of Equal Depth to Groundwater" published Spring, 2018, by the San Joaquin County Flood and Water Conservation District. The gradient descends from east to west. 4.2 Description/discussion of any existing and/or potential groundwater contamination issues in the general location of the site: The concerns for groundwater contamination in this area are deemed moderate due to the depths involved. Insecticides, pesticides, and fertilizers typically do not significantly impact groundwater at these depths. However, as with any agricultural area, there is always a potential for contamination due to chemicals used in the farming operation. The residential units will meet County Standards for Nitrate levels. 4.3 Description of location (address/APN), type and construction of well and location (well head/kitchen tap) where water sample(s) were obtained: There are no existing wells on the project site. No water samples were taken. 4.4. Description of constituents being tested for in the water sample: N/A 4.5 Description of how sample was obtained, handled, stored, and transported to the lab: N/A 4.6 Complete Chain of Custody document, including printed and signed name of third party sampler, condition of sample and date and time the sample was submitted to the lab. For Laboratory samplers, complete laboratory report to include the above noted information: N/A 5.0 SOIL PROFILE INFORMATION SECTION 5.1 Site map showing the location, with dimensions, of the soil profiled pit on the parcel. See Appendix. 5.2 Description of soil profile pit including depth and dimensions. The shallow test holes were prepared per County Standards. The holes were excavated to a depth of 42 inches and 8 inches in diameter. The holes were backfilled with 2 inches of "pea gravel". 2