SU0006090 SSNL - Laserfiche WebLink

Home Browse Search

` November 27,2006 NOA Project Number: E06087A 3.4 Future On-Site Sources of Nitrate 3.4.1 Quantity and Quality ofDomestic Wastewater From Proposed Project The following discussion is for determining the long-term waste water flow generated from the proposed residences or commercial usage for the nitrate loading analysis and should not be used for septic system design purposes. Typically,use estimates for the sizing of septic systems include a peak use factor,whereas the numbers discussed here are based on long-term averages. Thirty-eight recreational parking spaces will be developed on the subject property.A recreational vehicle is presumed to be occupied by two to four people during the warm summer months. Therefore, a an average total of three people will be used to calculate the recreational septic tank /y,¢j usage for the site. V A six bedroom residence may be potentially developed on the property in the future.A six bedroom residence is presumed to be occupied by up to seven people over the long term.Therefore, a total of ( 3'419 seven people per parcel will be used to calculate the residential septic tank usage. A marina office and snack shop will be developed on the property.The office and snack shop are estimated to have one or two employees over the long term.An average of approximately twenty customers are estimated at the snack shop per day during the peak summer season. The picnic area will have two showers which will serve up to 20 people per day. The estimated sewage flow rates for use categories are available from a number of references. The uses presented below were guided by the San Joaquin County On-Site Wastewater Disposal Standards (2003),Crites and Tchobanoglous (1998), and EPA (1980). The references indicated that 30 gallons is typical for a developed campground per visitor.The references indicate that 13 gallons for each L employee is typical for an office worker,and 6 gallons is typical for a short order restaurant (Crites and Tchobanoglous, 1998).The text from Crites and Tchobanoglous (1998) (Table 4-2)indicates that the typical residential use rate is 70 gallons per day. The EPA (1980) Design Manual (Table 4-6) indicates the typical use rate is 45 gallons per day for a resident. The following tables presents our estimate of the septic waste water uses associated with the Site. The rates presented from the references provide general guidance but do not always reflect a match in usage. Careful examination,professional judgement,and experience are necessary to select a reasonable flow rate estimate. The flow rates selected for the uses associated with this project are presented next. 5