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Inspection Report 12 August 2005 Windmill Cove Marina San Joaquin County highest groundwater. The fuel line then runs through the water along side the dock to the fuel dispenser. Since the storage tank and piping to the dock all appeared to be above the high water mark and the dispenser is an older suction unit, it appears that the logical point of water entry into the fuel line would be at the submerged portion in the river. This would be the most likely place to check for any leakage. No petroleum sheen was observed in the vicinity of the fuel dock or the submerged fuel line. It would appear that the leak might be activated only by the suction created when the dispenser is operated and may not be leaking into the river. Onsite Wastewater Treatment: The Windmill Cove Marina has two separate onsite systems that are septic tank leach field systems. One system serves the marina residents, bar/restaurant, and office. The other serves the RV Park. The marina has approximately 37 berths with residents and the RV park has approximately 52 spaces with connections to the wastewater system. Note the berths in the marina do not have domestic wastewater hook ups, however the tenants must utilize the bathhouse or bar/restaurant for showers and restrooms. The RV park has a bath house and waste dump station available for the tenants/visitors and a bath house for tent campers when in use. There are no domestic wastewater pump-out facilities supported for the residents or the visiting boaters within the marina. The marina system that serves the office, bar/restaurant, and bath house (pictures 3 thru 6) was described as having one 10 to 12 thousand-gallon septic tank that gravity feeds an unknown length of leach field. The area that was pointed out as the location of the leach field is a small finger of land projecting into the marina approximately 40 feet wide and 150 feet long (see Attachment A). No other information was provided regarding this system's leach field. The RV park system that serves the RV connections and two bath houses (pictures 9 thru 12) was described as having two 10 to 12 thousand gallon septic tanks that have two separate pressure dosing tanks that dose the leach field from two ends of the leach field. The leach field was described as having standard leach field construction. The field was also described as having five leach lines that are approximately 200 ft long per line for a total of 1,000 linear feet. Most standard leach field systems do not construct leach trenches longer than 100 foot, however since this system is dosed from each end of the leach lines, this would be an acceptable construction. We were able to view the septic water that was in the dosing tanks prior to pumping to the leach field. We noted that the water was turbid in both dosing tanks with one dosing tank having visible solids. Turbidity and solids are indicators of problems with the septic tank's ability to effectively treat the influent. The need for septic tank maintenance and the importance of a regular septic tank maintenance schedule was discussed with the marina representative accompanying us. The following is intended as a quick over view of the hydraulic disposal capacity needed for each system: In calculating the hydraulic loading for the RV park we have estimated two residents per space and 20 gallons per day per resident. The minimum leach field hydraulic requirement would be 2,080 gallons. Assuming a liberal 2.0 gal/ft-d leach field trench hydraulic loading, the required leach field length would be 1,040 ft. The RV