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6- ` 3.6 Discussion of General Area Septic Tank Repair History: Repair history of the septic tanks in this area reveals that the leach lines and seepage pits have resulted in consistent performance. There have not been any incidents of unusual failures in the area. 3.7 Description of Proposed or Expected Maximum (including second unit dwellings) septic tank usage on site. The homesite has only a primary residence, no second unit dwelling is planned. Thus only one septic system is expected at this time. The six additional lots are each i entitled to a primary residence and a second unit dwelling. L 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 100 feet according to the map of"Lines of Equal Depth to Groundwater" published Spring, 1999, by the San Joaquin County Flood Control 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 is deemed low due to the depths involved. 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 farming operation. L4.3 Description of location, type and construction of well and location where water sample(s) were obtained: Water samples were taken from a faucet 100 feet west of the barn located at 5475 Van Allen Road on May 1, 2007 by Mark Wondcrlich of Dillon &Murphy. 4.4 Description of constituents being tested for in the water sample: The water samples were being tested for nitrates and DBCP. 4.5 Description of how sample was obtained, handled, stored, and transported to the lab: The water samples were obtained from the faucet west of the barn located at 5475 Van Allen Rd. L The samples were taken by Mark Wonderlich 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. 4.6 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 L lab. For Laboratory samplers, complete laboratory report to include the above noted information: The complete chain of custody document is located in the Appendix. L ` 2 CA9901\Soil Suitability Study April 2007