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3.7 Description of Pro sod-or Expected Maximum (including second unit dwellings) septic tank usage on site. four parcels will likely have only primary residences, no second unit dwellings are plane Thus only . one septic system per parcel is anticipated at this time. Per County ordinances, each parcel on this map is entitled to one primary residence and one second unit dwelling. Due to the current number of septic systems and potential for new systems, this property could ultimately have 10 septic systems. 4.0 GROUNDWATER INFORMATION SECTION: 1/ 4.1 Description of the depth and gradient of groundwater in the general area: The depth to ground water in this area is approximately 130 feet according to the map of"Lines of Equal Depth to Groundwater" published Spring, 1999, by the San Joaquin County Flood Control and f 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 is deemed low due to the depths involved. p Insecticides, pesticides, and fertilizers typically do not impact groundwater at these depths, however, as with any agricultural area, there is always potential for contamination due to chemicals used in the fa in peration. Nitrate levels were surprisingly low considering the past land use. / 4.3 Description of location p , type and construction of well and location where water sample(s) were obtained: Water samples were taken from a spigot at the house located at 23490 N. Jack Tone Road on May 12, 2005 by Louie Mendez of Dillon & Murphy. The water samples were obtained at this location due to the fact that the home lies within the boundaries of this project. 4.4 Description of constituents being tested for in the water sample: The water samples ted for nitrates and DBCP(ere or dibromochloropropane (DBCP)were r225 ruL #0.225 the results for nitrates 11.6 mg/L. 4.5 Description of how sample was obtained, handled, stored, and transported to the lab: The water samples were obtained from the spigot at the house located 23490 N. Jack Tone Road. _ The samples were taken by Louie Mendez of Dillon & Murphy, and driven directly to Precision Enviro-Tech. The samples were taken and handled in accordance with Precision Enviro-Tech requirements. The results from the test can be found in the Appendix. 4 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: The complete chain of custody document is located in the Appendix. 2 cA04201soi[Report