SR0056541 SSNL - Laserfiche WebLink

Home Browse Search

3:27 in/yr(62_b mQ N/LZ(1 -_,25)+(13 in/yr x 0.1 niWL) Nr = (3.27 in/yr+ 13 in/yr) Nr = 9.5 ppm as nitrate-nitrogen(NO3-N)or 42.3 ppm as nitrate(NOD The calculated nitrate loading concentration in the recharge effluent from the Bullfrog Landing Marina is calculated to be near the Maximum Contaminant Level for nitrate in drinking water. The variables used in the calculations above are very conservative. For example, the use of 89.4 mg NIL, which was determined from actual effluent from wastewater flow from Flag City, a large commercial facility with both domestic and commercial wastewater flow characteristics. The total nitrogen determined in the effluent from this facility is a higher nitrogen concentration than those concentrations published in the sources referenced in Section VII of this report. Additionally, various researchers place the nitrogen reduction occurring in septic tanks at 10% to 20%. From the May 8, 2003 Symposium "Onsite Wastewater Treatment -Nitrogen Removal," Dr. Stuart Oakley of Chico State University states that"approximately 20% of the total nitrogen generated is removed in the septic tank." As noted above, this estimate of 20% was used for nitrogen reduction occurring in the septic tank. Thirdly, an entire year(365 days) was used in the calculations when the facility will only be operating approximately six months out of any given year. IV. WASTEWATER MANAGEMENT SYSTEM - DESIGN CRITERIA SSS§ 3.7. The design of the pressurized mound disposal system for the project is based upon criteria for efficient operation, disposal field longevity, and environmental protection. Septic System components have been specified from Quanics, Inc. of Crestwood, Kentucky. An overview of the system operation is as follows: Influent waste from the two public restrooms and the Manager's Apartment will gravity through six-inch ABS tight lines into a single compartment 125 gallon fiber lass sewa a urn Quanics Part Number: SS-125--S with a sewage pump uanics PN: P-SS-12T). The fiberglass pump tank will be connected to the underside of the dock with stainless steel strapping and wood cribbing. Although the sewage p=will be a sip lex pump system, another P-SS-12T pump unit and flexible effluent discharge assembly(Quanics PN: PDS- EDF-2.0) must be purchased. This pump package is referred to by Quanics as a"plug and play" system so that if there is a pump failure and the high water level alarm (Quanics PN: AC-A-0) activates, the failed pump can be easily removed and the new backup um which is kept on-site can be dropped into the fiberglass tank and plugged-in(Quanics-PR.'AC-JPB). This replacement system has been approved by Mike Huggins, R.E.H.S. of EHD. Another P-SS-12T back-u]2 um must then be immediately purchased from Quanics, Inc. This sewage pump will pump sewage influent through a 2-inch flexible PVC tubing along the sides of each of the floating docks. Since the Manager's Apartment and Store float independently of the Food Preparation Bar floating barge, this transport line must be flexible, and was therefore pre- approved by EHD staff. The transport line will then extend to the west end of this floating barge, and up the gangplank. 12 Chesney Consulting