September 12, 2013

Attention:  Gene Herring 
Division of Onsite Wastewater
805 South Wheatley Street, Suite 340
Ridgeland, Ms.  39157

Re: Dreamland Mobile Home Park
    Water System Upgrade
    Wastewater Treatment Facility Upgrade
    Pearl River County, Mississippi

Dear Mr. Herring,

Submitted for your approval is a proposal to upgrade and rehabilitate the Dreamland Mobile Home Park wastewater treatment system and potable water distribution system.  

The current wastewater treatment system, consisting of old filter beds and field lines, is failing. To remediate the current deficiencies, the following proposal is suggested. 

Essentially the old sewerage system is to be upgraded and rehabilitated by:
1)	Installation of a new 8” PVC collection line with manholes. 
2)	Installation of a 2500 gallon solids separator tank
3)	Installation of a 65 GPM duplex lift station with a 3” SCH 40 PVC Force Main line
4)	Installation of a 12,000 Gallon per day extended aeration treatment plant
5)	a 1,500 Gallon Effluent holding tank
6)	a pumping station with controls for spray field, and
7)	a 2.2 acre spray field

An onsite treatment and disposal system was chosen for the Park as the existing Nicholson Sewerage System has indicated that their infrastructure is incapable of handling the extra capacity (12,000 gallons per day) from the park.  The inability of the Pearl River County Utility Authority to provide adequate sewerage for the Park has hampered the project.  Thus, onsite treatment is indicated.

Re: Dreamland Mobile Home Park
    Water System Upgrade
    Wastewater Treatment Facility Upgrade
    Pearl River County, Mississippi

The wastewater from the mobile homes shall enter an 8” SDR 35 PVC collection line with 6” laterals, 4” services, and 48” diameter Manholes.  All wastewater shall pass thru a 2500 Gallon solids separator tank.  This tank is necessary for 2 reasons, 1) to remove trash & debris that could possibly clog the spray field matrix and 2) to liquefy the waste to improve encapsulation rate within the treatment plant.  From the separator tank wastewater passes to the 65 gallon per minute lift station and then to a 12,000 GPD extended aeration wastewater treatment plant.  

The treated wastewater effluent, after disinfection, shall enter a 1500 Gallon holding tank then a pump station that leads to 16 spray heads that covers 106,368 sqft.  (96,000 sqft coverage is required)  
 
The sewer treatment plant capacity is based on 40 mobile home sites with a maximum water usage of 300 gallons per day per trailer site. The preliminary design capacity was derived from Table 3-2 (see attached) from WASTEWATER ENGINEERING – Treatment and Use, Metcalf & Eddy, Fourth Edition.   The Dreamland Mobile Home Park currently has older type trailers, most are 70’ and less in length.  Half of the lots will not accommodate larger size trailers, thus there are many 2 bedroom trailers.  There are only 2 residents in many of these trailers, and 1 in some.  In an adjacent State, 300 gallons per trailer per day is the design standard.    It is felt that the design of 300 gallons/trailer/day is adequate for this upgrade.  This design will provide adequate treatment facilities for the process and disposal of wastewater effluent for Dreamland Mobile Home Park.

A 6” SDR 26 PVC water distribution line with valves and 2 hydrants shall replace the current water distribution line.  This shall be connected to the Nicholson Public Water Supply.

Re: Dreamland Mobile Home Park
    Water System Upgrade
    Wastewater Treatment Facility Upgrade
    Pearl River County, Mississippi

The attached project proposed will remedy the current sewerage and water deficiencies and bring Dreamland Mobile Home Park back into compliance with the Mississippi Department of Health and Mississippi Department of Environmental Quality as well as Environmental Protection Agency.

Respectfully,

Brian A. Mistich, P.E.
Mississippi Registration #20971

Xc:  Mr. Jim Weston, Mississippi Department of Health