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HomeMy WebLinkAboutBLD2025-00828 - BLD CD Environmental Health Review - 7/15/2025 (1� MASON COUNTY Permit No: �IG1 �D�>'DOCK COMMUNITY DEVELOPMENT /;" -'\' Permit Assistance Center, Building,Planning BUILDING PERMIT APPLICATION PROPERTY OWNER INFORMATION: CONTRACTOR INFORMATION: t_ X1 C NAME:WiliamH.Gates III NAME:Farbank Construction Co. n I—' Ed MAILING ADDRESS:15120 NE 92nd St MAILING ADDRESS:220 Madison Ave S T CITY:Redmond STATE:WA ZIP:86052 CITY:eainbnd9e island STATE:WA ZIP:116110 C cr PHONE#1:425.753 7755 PHONE:206 842 9217 CELL: 206 551 9679 T tV v o PHONE#2:425 753.7755 EMAIL:cohn@fairoaru¢onatrucbon corn tom) cTi EMA.IL:Bii watermark4iccorn L& IR I REG#FABCC183C2 EXP. 06/25/26 PRIMARY CONTACT: OWNER 0 CONTRACTOR❑ OTHER❑ NAME DERRICK'AN iKEN,OWNER REPRESENTATIVE EMAIL Ocr don(g satermark-tc tan MAILING ADDRESS 15120NE92n4S1 CITY Redmond STATE WA ZIP 96°52 PHONE 425'763.7756 CELL i25.753'7765 PARCEL INFORMATION: PARCEL NUMBER(12 Digit Number) 32233-50-00012 ZONING RC2 LEGAL DESCRIPTION(Abbreviated) SUNNY BEACH PCL 1 OF BLA R04.57&T L FIRE DISTRICT 6 SITE ADDRESS 6999E STATE ROUTE 106 CITY UNION DIRECTIONS TO SITE ADDRESS Travel East from Union on Highway 106,property on left just before Alderbrook Resort IS THE PROJECT WITHIN 300 FT OF SLOPE(S)GREATER THAN 14%: YES❑r NO 0 SNOW LOAD:25 psi` IS PROPERTY WITHIN 200 FT OF THE FOLLOWING: (Check all rharappty) SALTWATER 0 LAKE❑ RIVER/CREEK 0 POND 0 WETLAND 0 SEASONAL RUNOFF 0 STREAM 0 TYPE OF WORK: NEW 0 ADDITION 0 ALTERATION❑ REPAIR 0 OTHER 0 USE OF STRUCTURE(Residence,Geroge,Commercial Blo;g,efr)Residence IS USE: PRIMARY 0 SEASONAL 0 NUMBER OF BEDROOMS 4 NIJMBBF F_BBAATHROOMS 4 HEATED STRUCTURE? YES(Whole Bldg)0 YES(Tart[s]of Blot)❑ NO❑ 1 DESCRIBE WORK Irderror remodel and two-story addition on an existing one-story angle-farmly residence 2 SOUARE FOOTAGE:(proposed! 1ST FLOOR 2289 sq.ft. 2ND FLOOR 650 sq.ft. 3RD FLOOR° sq.ft. BASEMENT 203 sq.ft. DECK B6 sq.IL COVERED DECK 219 sq.ft. STORAGE 0 sq.ft. OTHER° sq.ft GARAGED sq.ft. Attached❑ Detached 0 CARPORT 0 sq.ft. Attached 0 Detached 0 MANUFACTURED HOME INFORMATION: *4 COPIES OF THE FLOOR PLAN REQUIRED* MAKE MODEL YEAR LENGTH WIDTH BEDROOMS BATHS SERIAL NUMBER ENVIRONMENTAL HEALTH: SEWAGE/SEWER SOURCE: SEPTIC 0 SEWER 0 / NEW 0 EXISTING 0 PLUMBING IN STRUCTURE? YES 0 NO 0 if yes,attach completed Water Adequacy Form PER]METER/FOUNDATION DRAINS PROPOSED? YES 0 NOD EXISTING SQ.FT. 1946 EXISTING BEDROOMS 2 PROPOSED BEDROOMS 2 TOTAL BEDROOMS 4 OWNER acknowledges that submission of Inaccurate inform abon may result in a stop work order or permit revocation.Acknowledgement of such is by signature below.I dedere that I am the owner and I further declare that I am entitled to receive this permit end to do the work as proposed I have obtained permission from all the necessary parties,nduding any easement holder or parties of interest regarding this project. The owner or legal representative,represents that the information provided is accurate and grants employees of Mason County access to the above descnbed property and structure(s)for review and inspection Thin permit/application becomes nul&void if work or authorized construction is not commenced within 180 days or if construction work is suspended fore penod of 180 days. PROOF OF CONTINUATION OF WORK ON THIS PERMIT IS BY MEANS OF INSPECTION. INACTIVITY OF THIS PERM! APPLICATION OF 180 DAYS OF MORE WILL CAUSE.THE APPLICATION TO BE EXPIRED.(MASON COUNTY CODE 14.0842) X 0.7i/Z.� ignattxe of OWNER(Must be signed by the OWNER) Date DEPARTMENTAL REVIEW APPROVED DATE DENIED DATE TAGS/NOTES/CONDITIONS BUILDING DEPARTMENT PLANNING DEPARTMENT FIRE MARSHAL N PUBLIC HEALTH ik,et c 4ri -4.44, March 28`h, 2025 Rhonda Thompson, RS Environmental Health Specialist Mason County Public Health 415 N. 6th St. Shelton, WA 98584 RE: Hood Canal — Union Residences—Community OSS; Parcel No. 322335000011 SU: Community Drainfield Capacity Dear Rhonda, Regarding the property parcel listed above, this letter and its enclosures present a review of the capacity of the community on-site sewage system (OSS) aerobic treatment unit (ATU) and drainfield and the desire to reclassify the permitted maximum number of bedrooms that can be accommodated by the community OSS. SUMMARY OF REQUEST To first summarize the request, the community OSS has a permitted maximum daily flow of 3,060 GPD, based on the 2005 design and subsequent approval by Mason County (see enclosed community OSS design and record drawing file, also filed under Parcel No. 322335000011). This maximum daily flow was based on a design for 17 bedrooms at a "daily flow" of 120 GPD/bedroom, or 2,040 GPD, multiplied by a second peaking factor of 1.5 for a permitted maximum daily flow of 3,060 GPD. It is not understood why a second peaking factor of 1.5 was applied to the initial design flow, as the 120 GPD/bedroom design flow already uses a peaking factor of 1.33, as described in WAG 246-272A-0230— Design Requirements - General. Based on the permitted maximum daily flow of 3,060 GPD, along with several other supporting factors discussed in this letter, we would like to reclassify the maximum permitted number of bedrooms to 25.5 ([25.5 bedrooms] x [120 GPD/bedroom] = 3,060 GPD). DETAILED NARRATIVE OF REQUEST The current community OSS, including the aerobic treatment unit (ATU) and drainfield, was approved by Mason County in February 2007 (design approval letter from Cathy Waite dated February 28th, 2007) for a maximum day flow of 3,060 GPD, at a maximum soil hydraulic loading rate of 1.0 gallons per day per square foot (GPD/FT2)for the former Washington State Type 2A soil classification. To achieve the 3,060 FT2 of drainfield trench bottom area, 12 laterals, each 85 FT long and 3 FT wide were constructed (totaling exactly 3,060 FT2). The ATU is an Orenco'AdvanTex®single-pod AX-100 system and has an "operating capacity" (i.e. long-term, sustained) design flow of 2,500 GPD, and a maximum day design flow of 5,000 GPD, when the "influent" to the AdvanTex®treatment system is equal to or less than Washington State's Treatment Level E (i.e. typical residential Aqueous Solutions Engineering,PLLC Ph:(360)318-4704 Ern: mike.moren75@gmail.com P.O. Box 1635 Bellingham, WA 98217 Page 1 of 5 Hood Canal-Union Residences Community OSS Capacity Re-allocation Request March 28th, 2025 strength septic tank effluent); or on a mass load basis, up to four (4) pounds of BOD5 (5- day biochemical oxygen demand) per day, sustained. The AdvanTex"treatment system is a Washington State Treatment Level "C"-registered ATU. The final permitted Design Flow of 3,060 GPD for the community OSS was derived from a design flow of 2,040 GPD based on a total of 17 bedrooms (17 bedrooms times 120 GPD/bedroom design flow), multiplied by a second "LOSS" (Large On-site Sewage System) peaking factor of 1.5 ([2,040 GPD] x [1.5] = 3,060 GPD). It is not clear why a second peaking factor was applied. Washington State's design flow of 120 GPD/bedroom already includes a 1.33 peaking factor, as presented in WAC 246- 272A-0230 Design Requirements— General: (2) The designer shall use the following criteria when developing a design for an OSS: (d) The OSS is designed to treat and disperse the sewage volume as follows: (i) For single-family residences: (A) The operating capacity is based on 45 gpd per capita with two people per bedroom. (B) The minimum design flow per bedroom per day is the operating capacity of ninety gallons multiplied by 1.33. This results in a minimum design flow of one hundred twenty gallons per bedroom per day. It should be noted that this WAC chapter language was filed 7/18/2005, and became effective 7/1/2007. The original community OSS design application was submitted on or around May 4'h, 2005, underwent some changes during the County review process, and was ultimately approved by Mason County in a letter dated February 28'h, 2007. The Code language above is also consistent with the upcoming WAC 246-272A revision that will become effective on 4/1/2025. Mason County Public Health On-site Standards also does not require a second peaking factor placed on the 120 GPD/bedroom. The Mason County's On-site Standards do have the following requirements for OSS with design flows greater than 2,000 GPD and less than 3,500 GPD: • Pressure distribution. • Annual operation and maintenance. • All of the Recommended Standards and Guidance for pressure distribution must be followed. The required drainfield area shall be split into two 50 percent drain fields. A third 50 percent drainfield shall be constructed initially in order to provide for alternation (long term resting). A reserve area equal to an additional 50 percent is required. Where facilities have an automatic resting cycle like a campground, the requirement for three 50 percent drain fields may not be necessary. A 100 percent reserve is required when a third 50 percent drainfield is not required. Aqueous Solutions Engineering,PLLC P.O.Box 1635 Bellingham,WA 98227 (360)318-4704 mike.moren75(amail.com Page 2 of 5 Hood Canal-Union Residences Community OSS Capacity Re-allocation Request March 28'h, 2025 The community OSS meets all of these requirements. For the drainfield reserve area, a reserve area equal to 100% of the primary drainfield area is set aside. The existing lateral trenches have a 9-FT. on-center spacing, and the reserve trenches are located between the built trenches, as shown in the 2025 Record Drawings recently submitted to Mason County Public Health. As stated in the third bullet on the previous page: "Where facilities have an automatic resting cycle, the requirement for three 50% (constructed) drainfields may not be necessary. A 100 percent reserve area is required when a third 50 percent drainfield is not required." The family compound really only sees use primarily from Memorial Day weekend through Labor Day weekend, and even with that, use isn't constant during this time period. Outside of this primary use period, only a few year-round staff generate wastewater to the community OSS, and this is just during a typical 8- to 9-hour work day. For any contracting work done on site during the "off-season", contractors utilized temporary portable toilets; they do not use the community OSS. Therefore, with these use patterns, the community OSS has a built-in resting cycle from moderate to high use that lasts almost nine months. Based on the Washington State design flow of 120 GPD/bedroom, and an approved overall design flow of 3,060 GPD for the community OSS, and as stated in the initial "Summary of Request' section of this letter, we would like to reclassify the total number of bedrooms allowed for this community OSS to be 25.5 bedrooms ([25.5 bedrooms] x [120 GPD/bedroom] = 3,060 GPD. To further support this request, I will present a list of measures that have recently been done to the community OSS over the last three years to ensure that it is in excellent working condition. SUMMARY OF DETAILED OSS EVALUATION, REPAIRS/MODIFICATIONS, AND DOCUMENTATION I was retained by the property owner/management entity in early 2021 to evaluate an "off-season" (fall/winter) high-flow condition due to a documented I&I (infiltration & inflow) condition of a significant groundwater infiltration leak into a deep septic tank serving one of beachfront buildings. The project evolved into a detailed evaluation of the community OSS drainfield, most of the septic & pump tanks, the effluent sewer mains, and the AdvanTex®ATU, and subsequent repairs & modifications of the community OSS. The evaluations and repairs & modifications are summarized below and on the following pages. COMMUNITY DRAINFIELD Due to excessive "off-season" I&I flows, coupled with spongy sod in the greater drainfield area, a thorough investigation of the drainfield was performed. A few soil test holes were excavated within and adjacent to the drainfield. It was discovered that the Aqueous Solutions Engineering,PLLC Y.O.Box 1635 Bellingham,WA 98227 (360)318-4704 mike.moren75(gmail.com Page 3 of 5 Hood Canal-Union Residences Community OSS Capacity Re-allocation Request March 28'1, 2025 cover soil was of poor quality with poor drainage characteristics, and that the sod also had a high silt & clay content, acting like a sponge in retaining rainwater. It was also discovered that there was absolutely no ponding in the drainfield trenches, nor was there any signs of anaerobic conditions in the drainfield gravel, and that the soils within the vertical separation below the drainfield trenches were course gravelly sands consistent with the 2005 soil assessment. A deep curtain drain was also confirmed to be installed upgradient from the drainfield. The actual drainfield lateral trenches were found to be in excellent condition with no signs of hydraulic or organic overloading, despite the excessive I&I flows during the "wet season". I designed a major drainfield repair to fully replace the sod & cover soil down to the filter fabric with a sandy cover soil & sod, and Danos Septic did the repair/modification work in the late winter & spring of 2023. Danos Septic also performed lateral hydro-jetting in the spring of 2023 and again in the fall of 2024. I, along with Danos Septic, conducted a detailed post-construction inspection of the drainfield in the spring, and then again in the fall, of 2024, making sure the drainfield had balanced flow distribution, and that the drainfield dose tank pumping system and drainfield were in top working condition. COMMUNITY OSS EFFLUENT SEWER MAINS Danos Septic conducted a video inspection of the existing gravity effluent sewer mains in late summer& early fall of 2023 and found them to be in good condition, with no visual signs of I&I or broken pipe or joints. Based on this, a decision was made to continue using the existing gravity effluent sewer conveyance system. INDIVIDUAL BUILDING SEPTC & PUMP TANKS During the late summer and early fall of 2023, Danos Septic performed tank water- tightness testing on a majority of the existing septic and pump tanks in the community OSS and found that some tanks should be replaced, some could be repaired, while some were in good water-tight condition as-is. Subsequently, in the fall/winter/spring of 2023/2024, the community OSS repair/modification project continued, with Danos Septic replacing or repairing most of the septic & pump tanks. In addition, other improvements were made including adding septic tank effluent filters, and new pumping systems and control panels where needed. Any new tanks were sized to meet Mason County's current tank sizing criteria. ORENCO®ADVANTEX®AEROBIC TREATMENT (ATU) I performed an inspection/evaluation of the Orenco®AdvanTex®AX100 aerobic treatment system and found it to be in good working condition. There were no signs of excessive use or overloading. I, working with Danos Septic, performed some standard O&M, and minor repairs. UPDATED RECORD DRAWINGS After the major 2023/2024 repairs/modifications were complete, I prepared a detailed and comprehensive set of Record Drawings for the entire community OSS. This updated set of record drawings includes updated tank information (make & model, installation year[where known], location, size, configuration) for both new and existing tanks. Pump and control panel make & model information was also included. I also included updated float level settings, and recommended control panel settings for the Aqueous Solutions Engineering,PLLC P.O.Box 1635 Bellingham,WA 98227 (360)318-4704 mike.moren75@gmail.Com Page 4 of 5 Hood Canal-Union Residences Community OSS Capacity Re-allocation Request March 28"', 2025 AdvanTex®treatment system for both peak season, and "off-season" use, as well as updated settings for the drainfield dosing system. CONCLUSION The community OSS was sized, and constructed, for an ultimate design flow of 3,060 GPD and has an un-constructed reserve area equal to 100% of the design flow. This design flow will accommodate a total number 25.5 bedrooms, based on the Washington State (and Mason County) Design (peak day) Flow of 120 GPD per bedroom. The overall community OSS is in excellent working condition, with absolutely no signs of excessive hydraulic or organic overloading. I see no reason why the community OSS could not be re-classified from the original (2005) 17 bedroom capacity, to the requested 25.5 bedroom capacity, as both the constructed drainfield capacity and the ATU were designed to safely accommodate the Mason County-permitted Design Flow of 3,060 GPD. It is understood by the property owner, and management entity, that any additional bedroom requests, beyond the 17 currently approved, may require upsizing of existing septic and/or pump tanks to meet current Mason County tank sizing requirements, and that any such request will have to be permitted by Mason County Public Health in advance of any such work. Please contact me via phone (360) 318-4704, or e-mail mike.moren75(c�gmail.com should you have any additional comments or questions. PELM. • O Sincerely, N ,oF wA 4 �'\ • 0 8/ ,}3079 12 Mike Moren, P.E. �c� �4'c1srs g2 Aqueous Solutions Engineering, PLLC �SSIpNAL_AG Cc: Bill Hughes, Rhodes Lodge (Watermark Estate Management Services, LLC) Jim Davidson, Shane McGilvra (James Davidson Architects) Colin Gilligan, (Fairbank Construction) Justin Wells, Jon O'Connell (Dano's Septic Tank Pumping) Enclosure: Community OSS Design, Approval, and As-Built Drawing Documentation (2005- 2007) Aqueous Solutions Engineering,PLLC P.O.Box 1635 Bellingham,WA 98227 (360)318-4704 mike.moren75@gmail.com Page 5 of 5 . ! RA\,, ttt..>• r ......... z44 .- 8i- .0 ^ © ' *: 7is : > § J& $ 29 N:.N...*-r-/N).s'.. o ° 2 $ems 22 o _ §F,� . §$ ` §tit i - - , 1 - 8 � )§_ _ _ _ - --- / \ - - . ~- _ ... .k}k CO < < A : ... \ -� 1 ` \ » \ aP \ 0 � - � r/ . / ! . 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