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WASTE DISCHARGE REQUIREMrNTS ORDER NO.R5-2003-0099 2 NEWPORT PACIFIC CAPITAL COMPANY,INC. ARBOR MOBILE HOME PARK WASTEWATER TREATMENT FACILITY SAN JOAQUIN COUNTY 8. Wastewater is delivered to the system headworks by gravity. The headworks lift station consists of six-foot diameter concrete pipe approximately 12 feet deep that is covered with a concrete slab. Two 40-gpm grinder pumps are installed at the bottom of the lift station. The pumps operate on level controls controlled by float switches. 9. Wastewater is treated using a Nottingham Hygi-Aeration Sewage Treatment Plant Model No. HA25. The treatment capacity of the system is 45,000 gallons per day(gpd). The system is operated as an extended aeration facility. 10. Clarifiers are constructed of reinforced precast concrete with a capacity of 2,500 gallons. The clarifiers are equipped with baffles, a sloped bottom, a sludge airlift pump, a skimmer airlift pump, and a v-notch weir on the outlet. Clarified effluent flows to polishing tanks; settled sludge is either returned to the aeration tank or it is discharged to the sludge storage tank. The skimmer pump discharges to the first aeration tank. Sludge wasting is scheduled by the operator based on system performance. 11. Wasted sludge is stored in the Sludge Storage Tank, which consists of two 2,000 gallon concrete tanks. The sludge is aerobically digested in the Sludge Storage Tank. 12. Treated wastewater is discharged to a distribution tank that allows the operator to select the destination of the wastewater. The operator manually adjusts the flow to the disposal areas and rotates the effluent flow as necessary. Treated wastewater is discharged to 60 seepage pits and a Biodiffuser(a gravelless trench system). A schematic of the wastewater treatment system is presented on Attachment B, which is attached hereto and made part of this Order by reference. 13. The facility is equipped with 60 seepage pits. Each seepage pit is approximately five feet in diameter and 25 feet deep. All seepage pits have removable inspection covers for monitoring and maintenance purposes. The seepage pits are spaced 12-feet on center. Each seepage pit provides approximately 393 ft2 of potential absorption area with a total of 23,580 ft2 for the 60 seepage pits. 14. The facility is also equipped with a gravelless leachfield that was installed in 2001. The system consists of four sets of gravelless leaching chambers estimated to have been installed approximately five-feet below the surface. The gravelless leachfield provides a total of approximately 1,344 ft2 of potential absorption area. 15. Good practice and Section 3.3.2.b of the San Joaquin County Public Health Services Environmenal Health Division Sewage Standards requires 100-percent of open land equal to the size of the installed sewage system available for future use if needed. The Discharger does not comply with this requirement. 16. The RWD states that the package plant treatment capacity is approximately 45,000 gpd, which should be adequate for the 173 homes. 17. On 11 February and 17 February 2003, the Discharger collected samples of the water supply and treated wastewater to evaluate the'increase in concentrations of TDS, sodium, and chloride. The sample data from each monitoring event are presented below.