Item 6C - OSSF Analysis James M. Sims,, P.E. Geotechnical
6935 CRAIG ST,
FORT WORTH, TEXAS 76112 Engin e C ,
317.429.2346
3 Nov 16
Phillip Kushner
P.O.Box 600055
Dallas,Texas 75360
Re.1?easibiI0y kn,aivs s—Proposed On-Site Sewage Facilities(OSSFs),Proposed Residences,
Proposed Subdivision of a 3.106-Acre Site,2500 North Kimball Avenue,City of Southlake,
Tarrant County;Texas
Mr.Kushner;
This letter and attachment will serve as a statement as to file feasibility to provide OSSF designs for the above
captioned proposed subdivision. The proposed subdivision is shown as Concept A.I by G&A Consultants(dated 30
Aug 16)and is attached as flute ll 1.
The following data are pertinettt;
1) The Site has a grossarea of approximately 3.106 :res.
2) The Site is proposed to be subdivided into two separate lots(Lot I &Lot2)having Gross areas of 1.636 and 1.392
acres,respectively, A Right-of-Way dedication of 0.070 acres along North Kimball Road is also proposed.
3) The western property boundary abuts Corps of Engineers property along Grapevine Lake. A Flowage Easement
along this boundary results in a reduction to;het,meas of the proposed lots of 1.133 and 1.001 acres,respectively.
4) These Ale t areas meet the current iniriimum sizing of 1.00 acre for tot sizing per current Texas Commission oft
>,rtvironmental_, ctrl t)i„(TC}.__ )and Tarrant County I IGGItt[11 cR<31tm�rtl(7 Ci ID)requirements.This regardless of
the water supply source.
5) Residence sizes of less than 4,500 square feet living area(rive Bedroom design equivalent)are proposed on each
lot,
6) The TCEQ Design Flow(Q)from residences of this size is 360 gallons/day are to be
inswiled),
7) The max-irrrum net area required for an OSSF installation for this Design Flow is 5,625 square feet(360 gpd/0.064
gal/sf/day).
8) These proposed lots have arews available Ibr OSSF construction(after deduction of the area of TCEQ required
setbacks)greater than this maximum amount,
9) The lots are heavily wooded.
10) The lots have slopes of less than approximately 15%.
11) No water wells are located on or near the.site.Any proposed water wells shall be"pressure cemented”per T'CEQ
requirements.
12) Into soil borings were conducted on the proposed lots.
13) Submittal of Site Specific OSSF Designs for these sites will require a Site Evaluation(per TCEQ
recommendations)and the proposed location of al!proposed site improvements.
Given the above data, it:is my opinion that.it is possible to render OSSF designs for these lots meeting the current
requirements of'the(above referenced)Texas Commission on Environmental Quality(TCEQ)document Title 30,
Texas Administrative Code, Chapter 255, On-Site Sewage Facilities,updated 27 Dee 11
I trust that this letter will provide you with the information required to evaluate the feasibility of OSSF construction oil
these proposed tots. If you have any questions,or if I may be of further service,please call.
Sincerely,
co
iSOA —v
;lames M.Sins,P.E. °t
rr` gistration f#
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Item 6C-OSSF Analysis 1
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Item 6C-OSSF Analysis 2