2005, 10-04 Engineer Ltr re DrainfieldMETRO ENGINEERING, INC.
Civil Engineering and Project Management Services
October 4, 2005
Spokane Regional Health District
1101 W. College, Room 402
Spokane, WA 99201
Sent Via Fax # 324-1567
ATTENTION: Don Copley
RE: Sewage Disposal System for 17307 E. Broadway
Lot 6, Bacon's Addition,
Metro Engineering's Project No.: 05-315
SRHD Application No.: 05-7681
Dear Mr. Copley:
This letter is to advise you that Metro Engineering, Inc. has been retained by Markham
Homes to perform the design and prepare the plans for a pressurized drainfield system for
the above referenced residential property. This residential property is located at 17307 E.
Broadway in Spokane County.
We performed a site visit on September 23, 2005. A preliminary site plan and engineering
calculations were prepared to verify that a pressure system can be engineered and provided
for this site. There is adequate area for the construction of the facilities. See the attached
preliminary design.
We request the building permit for this property be released contingent upon fmal design
of the pressurized drainfield system.
Please call if you have any questions. Thank you for the review of this item.
Sincerely,
Metro Engineering, Inc.
Joel G. Lee, P.E.
Principal Engineer
cc: Markham Homes
File #05-315
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S. 324 Sherman St. Spokane, Washington 99202 Ph.: 509-624-9351 Fax: 509-624-8153
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(TYP. OF 6)
108.00'
REPLACEMENT J
AREA (TYP.)
SINGLE COMPARTMENT
1000 GAL. DOSING TANK
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PRESSURIZED GRAINFIELD
1" SCH. 40 PVC
12' ON CENTERS
(SEE DETAILS)
2 COMPARTMENT 1000
GALLON SEPTIC TANK
IN
PROPOSED
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/ METRO ENGINEERING, INC.
S. 324 SHERMAN
SPOKANE, WA 99202
(509) 624-9351
PRESSURIZ
17307 E
LOT 6,
ED DRAINFIELD DESIGN 1
BROADWAY AVENUE
BACON'S ADDITION
DRAWN BY: JKO
CHECKED BY: JCL
DATE: 10/04/05
PROJECT No.: 05-315
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POLYSPUN CONST.
FABRIC (TYP.)
1" SCH. 40 PVC PIPE
WITH 3/16" HOLES
6' O.C. (TYP.)
WASHED DRAIN ROCK
(1 /2"-2 1/2") TYP.
12' (MIN.)
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REPLACEMENT
DRAINFIELD SECTION
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SANDY LOAM/TOPSOIL
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12" MAX.
TRENCH DEPTH
24" MIN. TO
RESTRICTIVE
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