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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 been no incidents to report. (See Appendix) 3.7 Description of Proposed or Expected Maximum(including second unit dwellings)septic tank usage on site. Located on the subject parcel is an existing house, garage,pool, pool house, mobile home, a barn, and four(4) storage sheds. There are no immediate plans for any more dwellings. 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 150 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 are 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. 4.3 Description of location, type and construction of well and location where water sample(s) were obtained: Water samples were taken from a faucet at the well located at 14404 E. State Route 26 on September 26, 2007 by Mike Toy of Dillon & Murphy. 4.4 Description of constituents being tested for in the water sample: The water samples are 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 at the well located at 14404 E. State Route 26. The samples were taken by Mike Toy 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 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 c:\05147Soil Suitability Report 092607