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HomeMy WebLinkAboutCRT2025-00005 - CRT Application - 3/30/2026 MASON COUNTY Public Health & Human Services March 30, 2026 VLASAK HOMES LLC, 328 199TH AVE CT E LAKE TAPPS WA 98391 RE: Parcel 320215601036 SWG2025-00324 We have finished our winter observation period for Parcels 32021-56-01035 and 32021-56- 01036. Becky, I haven't gotten your observation data yet, but I will go ahead and share mine and close the permits. Both of these sites failed to show the minimum requirement of 12" of original undisturbed soil above a winter water table. Therefore, they are unsuitable for septic system installation at this time. Soil is susceptible to compaction when it is saturated, and the ground was disturbed before/during heavy rainfall during the clearing of these lots. Prior to development of these lots, they will need to undergo another winter observation to confirm the minimum 12" of original soil above the winter water table. New test holes will also need to be dug to confirm there is still 12" of original undisturbed unsaturated soil. I am unsure whether or when they may recover to a buildable state in the future. You may consider finishing the drainage project so the surface water runoff does not continue to saturate the soil. I also recommend filling in the deep trench down the middle of the lot so children and animals do not fall in and get hurt. Please forward this email to Tyler Vlasak and let me know if you have any questions. Respectfully, Rhonda Thompson, RS Senior Environmental Health Specialist Mason County Public Health 415 N 6th St. Shelton, WA 98584 360-427-9670 ext. 581 Rthompson@masoncountywa.gov MASON COUNTY PUBLIC HEALTH,COMMUNITY&ENVIRONMENTAL HEALTH 415 6TH ST.,SHELTON,WA 98584 SHELTON:(360)427-9670 X400*BELFAIR:(360)275-4467 X400 Do DO 3zort - C)) 056 SON,corjjt,�� S l3i 'dqPublicHealth Always working for a safer healthier Mason County 415 N 6`h Street, Bldg 8, Shelton WA 98584 Shelton: (360)427-9670 ext 400 •: Belfair: (360)275-4467 ext 400 ❖ Elma: (360)482-5269 ext 400 FAX(360)427-7787 Wet Season Observations SWG: Wl O 3Z- 1. Preliminary Activities A wet season monitoring program will be conducted after completion of the appropriate application form and payment of fees. The fees are based on whether the monitoring was performed by Mason County Public Health(6 inspections) or by a licensed designer(with 3 quality assurance inspections by Mason County Public Health.) If a licensed designer will be conducting the monitoring program, a site specific monitoring plan will be submitted by the designer as part of the overall system design. 2. Site Preparation A minimum of 2 observation ports will be installed in locations representative of a cross section of the proposed drainfield area. Recommended monitoring port design will consist of a vertically oriented section of 4 inch diameter perforated pipe, wrapped in filter fabric and bedded in clean, washed drainrock or pea-gravel that has been backfilled into a 12-24 inch test hole. The drainpipe should be capped and flagged so as to be easily visible to Public Health staff. 3. Observations and Presentation of Findings Wet season observations will take place during the months of January through March. The frequency and timing of observations will be dependent on site characteristics and on rainfall characteristics that occur during the monitoring period. The designer will submit a minimum of 6 observations along with the NCDC rainfall data for the area during the period of January through March (http://www.nedc.noaa.gov/oa/mpp/freedata.html). Observations will be recorded with the date and time of the observation and the depth of th6''water in the pipe. 4. Analysis of Findings Monitoring results will not be considered valid when the rainfall for the period of observation did not exceed�80% of the 10 year average rainfall for the area during the 6-month period of October through March. 5. Site Sketch (location of test holes and numbers) See Attached 1_{—-'l I.'- 17� 'iJ IZ r!J 1 � _ _ : J_—f _I_CI!-1 , I_TI i— -rri Li_LI(r _ 1 r l +i J (1. ll if �1�.171_• 1 }!I;: tlfl_flt _.lIJ, IfI L� I!I`IL7 I,. ri(ail. _I �I1r Yr!{[ ! 1 1191 ,_lJ.l—J ! 1— rf 1 1 1 `�)I )1 r L1�' 1}1 } II I J 1 1 f I f l f 1! I I. 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Updated 1/19/2016 1 1 SHELTON AIRPORT,WA US(USW00094227) 10 year average rainfaLL from October to March PRCP(Inches) #of days 1 2015-2016 0.398797814 182 2 2016-2017 0.404010989 181 3 2017-2018 0.295054945 181 4 2018-2019 0.231758242 181 5 2019-2020 0.280273224 182 6 2020-2021 0.299505495 181 7 2021-2022 0.337142857 181 8 2022-2023 0.233901099 181 9 2023-2024 0.283934426 182 10 2024-2025 0.271129944 181 average 0.303550903 80%average 0.242840723 2025-2026 winter)observation 0.313764045 Wet Season Observations Log Sheet Owner Name: Vlasak Homes Parcel Number: 32021-56-01036 NOTE: All measurements are from original grade to water level, not top of pipe. Test Hole/Port #1 Test Hole/Port #2 Test Hole/Port #3 Test Hole/Port #4 Date & Results Date & Results Date & Results Date & Results c641. r 0b O,4 04" -vra C b . 3 5 1, q / This form may be scanned and available for public view on the Mason County Web site. Updated 1/19/2016 Environmental Design, LLC. Septic Design • Wetlands•Mapping 2041 Little Hanaford Road PnNGR,�MaDR,ve Centralia, Wa. 98531 (360)219-3343 PANG BRIDGER LANE '�/'� N Mq bR VF EXISTING CULVERT N LEGEND /' - ?23 ® HUB ELEV PROPOSED CURTAIN DRAIN ® TEST PIT VICINITY MAP TO BE SLEEVED 36.37' 34.75' © EXISTING WELL EW 00 .... ___--- "'••••���..... Z --- n PROPOSED WELL PW O POWER P WR . . ... N o) STUMP 99......................................... .. PORT 1 ............ .. PROPOSED CURTAIN DRAIN SEE ATTACHED DETAIL 0 30 60 gg• . PROPOSED CATCHBASIN 1" = 30 FT FIELD STAKING OF DRAINFIELD IS FOR PERMITTING PURPOSES ONLY. PORT 2 DRAINFIELD LOCATION TO BE VERIFIED BY INSTALLER. •9�•..... !� 9L{........., O' .......... � i PROPOSED 3-BEDROOM RESIDENCE PROPERTY LINES SHOWN AS PER RECORDED DOCUMENT AFN: 3037023 THE PROPERTY LINES IN THIS MAP ARE I APPROXIMATE AND ARE NOT INTENDED 88 )3, H TO BE USED AS A SURVEY. L4/!✓F ll �Bedcy J R9eger '\•\ "L'iC�J!'ti tip i' N�k• CURTAIN DRAIN TO DAYLIGHT \ \ 12.12.2025 TO ROAD DITCH .5.- --.. \• CLIENT NAME: VLASAK HOMES PROPOSED DRIVEWAY •\. MAILING ADDRESS: 328 199TH AVE CT E \'\_ LAKE TAPPS,WA 98391 PHONE NUMBER: 253.241.9218 • SITE ADDRESS: PANORAMA DRIVE, SHELTON PARCEL NUMBER:32021-56-01036 S-T-R:21-20N-03W PERMIT NUMBER: DRAFTED BY: BJR JOB NUMBER:2025-090 PAGE 1 OF 4 REVIEWED BY: BJR DATE: 12.12.2025