00450683

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http://onlinepubs.trb.org...s/trr/1984/995/995-003.pdf

https://scholar.google.co...kins&publication_year=1984

Septic tank systems are used at 50 percent of roadside rest areas in the United States for onsite disposal of wastewater generated from restrooms and from recreational vehicle waste holding tank dump stations. Survey results are presented from 28 California roadside rest areas of the use of rest areas, and of the volume and strength of wastewater generated at restrooms and dump stations. Traffic densities in peak months averaged 24 percent higher than the annual mean, while peak holiday weekend densities averaged 86 percent higher for facilities serving one direction of traffic. A mean of 12 percent of mainline traffic used the rest areas, and of the traffic using rest areas that provided dump stations, 2 percent were recreational vehicles that actually dumped. Restrooms generated 5.5 gal of waste per vehicle, and dump stations generated 12 gal of wastewater plus 9 gal of washdown water per dump. Restroom wastewater is comparable in strength to domestic wastewater, but dump station wastewater (diluted by washdown water) produces about 20 times the quantity of sludge as the same volume of domestic wastewater. Depending on the proportion of dump station waste and the frequency of pumping the septic tank, rest area septic tanks should be sized to provide 1.5 to 30 days detention of diluted dump station wastewater, compared to 1.5 days for a domestic septic tank. Septic tank-leach field system design procedures consider the risk of overload for a particular design, or permit design to a selected acceptably low risk of overload.

Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved. Publication of this paper sponsored by Committee on Hydrology, Hydraulics, and Water Quality.

00450954

HS-038 995

pp 19-29

1984

Transportation Research Record

0309038049

Print

Figures (5) ; References (26) ; Tables (2)

Recreational vehicles; Roadside rest areas; Sludge (Deposit); Traffic density; Volume; Waste disposal; Wastewater

Design; Environment; Highways; Hydraulics and Hydrology; Planning and Forecasting; Terminals and Facilities; I21: Planning of Transport Infrastructure

TRIS, TRB

Mar 31 1986 12:00AM

• ICE JAMS AT HIGHWAYS AND BRIDGES--CAUSES AND REMEDIAL MEASURES
• IMPROVED PERCOLATION TEST FOR SEPTIC TANK LEACH FIELD SYSTEM
• IOWA DESIGN MANUAL FOR LOW WATER STREAM CROSSINGS
• SEMI-ARID STORM HYETOGRAPH PROPERTIES IN WYOMING
• THE EFFECTIVENESS OF STORMWATER DETENTION
• TREATABILITY OF RECREATIONAL VEHICLE WASTEWATER IN SEPTIC SYSTEMS AT HIGHWAY REST AREAS