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Home My WebLink AboutBLD2021-00761-05- Stormwater APPROVED,. INCORPORATED Wednesday, February 16, 2022 Lexar Homes Attn: Rob Owens 92 Kala Square Place Port Townsend, WA 98368 SUBJECT: Single Family Residence for William and Victoria Stearns 74 Goldfinch Lane, Port Ludlow, WA PN: 990-500-029 BLD2021 -00761 To whom it may concern: CMLENGINEERING 301 East fah Str,('t. Suit� I Pon Angdes.W;1shing1on ')/lJ62 (J(,O)/ i 17-0501 F.l,U60l417•0'il4 F.-111ail: ,,·11ovi,·�·i,,,l)''''l'"'·''t'I This letter is intended to address comments included in the letter from the Jefferson County Department of Community Development dated January 26th, 2022 regarding the subject property. At the request of Rob Owens of Lexar Homes, this office conducted an inspection of the onsite soils at the aforementioned residence on February 1 st, 2022 to determine the nature of the subgrade material specifically for feasibility of stormwater mitigation techniques. The onsite investigation consisted of observing onsite soils in a test pit excavated by Shoid Excavating approximately central in the east-west direction and toward the south end of the site. The soils generally consisted of approximately 4 feet of permeable soils over a very compact fine sand layer: The soil profile was as follows o to 6 inches: Sandy Loam (topsoil)6 to 48 inches: Loamy Medium Sand48 to 60 inches: Compact Fine Loamy Sand (very slow draining} No water was observed in the test pit and no significant mottling was observed. To specifically address the comments in the aforementioned letter: 1.There is 4 feet of permeable soils present onsite and no indication of water tableto at least 5 feet below ground surface 2. If drywells are utilized they should be sized to provide at least 3.3 cubic yards per1000 square feet. of roof area draining to the drywall, and should be kept as shallow as possible to allow separation from the dense layer noted above. It is recommended that shallow infiltration trenches (BMP T5.1 0A) be utilized in lieu of drywalls due to the relatively shallow permeable soils. Trenches should be BLD2021-00761 Feb 23 2022 Feb 28 2022 REVISED2252022 BLD2021-00761 2 From: sally ellis [mailto:salanjake@hotmail.com] Sent: Thursday, February 17, 2022 2:26 PM To: Seth Rodman <seth@zenovic.net> Cc: Rob Owens <ROwens@lexarhomes.com> Subject: Vicky Stearns Project‐ 74 Goldfinch Ln. Port Ludlow Hi Seth‐ I wanted to send our revised site map to you before sending it into the County. After reading the letter/report you provided to Lexar homes and Rob Owens. I have added the BMP T5.12 to the driveway and changed the drywell size. I know your report said shallow trenches would be best‐ however, if I did the math correctly‐ this project would require 3 ‐ 70 ft trenches. Unfortunately, this site won't really allow that‐ ( or not from what I can see) and meet the setbacks required for trenches. I wanted to double‐check with you before submitting the revised site map with your letter. To make sure I am not being a BONE HEAD‐ missing something that may be obvious to someone like you. I hope it is okay to ask you these questions I appreciate your time and assistance. Respectfully Sally L Ellis 1 Shannen Cartmel From:sally ellis <salanjake@hotmail.com> Sent:Monday, February 28, 2022 10:50 AM To:Shannen Cartmel Cc:Seth Rodman; Rob Owens Subject:Fw: Vicky Stearns Project- 74 Goldfinch Ln. Port Ludlow ALERT: BE CAUTIOUS This email originated outside the organization. Do not open attachments or click on links if you are not expecting them. Hey Shannen, Please see below email from Seth‐ Stating drywell is okay too‐ Thank you Sally From: Seth Rodman <seth@zenovic.net> Sent: Thursday, February 17, 2022 10:53 PM To: 'sally ellis' <salanjake@hotmail.com> Cc: 'Rob Owens' <ROwens@lexarhomes.com> Subject: RE: Vicky Stearns Project‐ 74 Goldfinch Ln. Port Ludlow Sally, Couple of quick questions: 1.Is the total roof area 2,783 suqare feet? If so you will only need 84 feet of trench. (30 feet of trench per 1000 square feet of roof area) 2.I talked with Rob briefly just now and he is likely going to go for a single shallow drywell with the following approximate dimensions: 5’W x 2’D x 25’L which will give approximately 9.25 cubic yards of volume which should be sufficient. 3.The deck area does not need to be counted toward stormwater management as it is going to be pervious (wood with gaps) and the sidewalk and driveway do not need to be included in the trench calc as they will be dispersed onsite. Thanks, Seth Rodman, P.E. Zenovic & Associates, Inc. 301 East 6th Street Port Angeles, WA 98363 PH: (360) 417-0501 Fax: (360) 417-0514 RECEIVED BY DCD 12/22/2021BLD2021-00761 RECEIVED BY DCD 12/22/2021BLD2021-00761 RECEIVED BY DCD 12/22/2021BLD2021-00761 RECEIVED BY DCD 12/22/2021BLD2021-00761 RECEIVED BY DCD 12/22/2021BLD2021-00761 RECEIVED BY DCD 12/22/2021BLD2021-00761 RECEIVED BY DCD 12/22/2021BLD2021-00761 RECEIVED BY DCD 12/22/2021BLD2021-00761 RECEIVED BY DCD 12/22/2021BLD2021-00761 RECEIVED BY DCD 12/22/2021BLD2021-00761 RECEIVED BY DCD 12/22/2021BLD2021-00761 RECEIVED BY DCD 12/22/2021BLD2021-00761 RECEIVED BY DCD 12/22/2021BLD2021-00761 RECEIVED BY DCD 12/22/2021BLD2021-00761 RECEIVED BY DCD 12/22/2021BLD2021-00761 RECEIVED BY DCD 12/22/2021BLD2021-00761 RECEIVED BY DCD 12/22/2021BLD2021-00761 RECEIVED BY DCD 12/22/2021BLD2021-00761 RECEIVED BY DCD 12/22/2021BLD2021-00761 RECEIVED BY DCD 12/22/2021BLD2021-00761 RECEIVED BY DCD 12/22/2021BLD2021-00761 RECEIVED BY DCD 12/22/2021BLD2021-00761 RECEIVED BY DCD 12/22/2021BLD2021-00761 RECEIVED BY DCD 12/22/2021BLD2021-00761 RECEIVED BY DCD 12/22/2021BLD2021-00761 RECEIVED BY DCD 12/22/2021BLD2021-00761