HomeMy WebLinkAboutSWG2023-00499 WET SEASON OBSERVATIONS - SWG Letters / Memos - 11/28/2023 WoobAIZD 333 QGmA-IL , cotln
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415 N e Street, Bldg 8, Shelton WA 98584
Shelton'. (360)427-9670 ext 400 8 Belfair. (360)275-4467 eat 400 c Drina:(360)482-5269 ext 400
FAX(36(l)427-7787
Wet Season Observations SWG: Q0 23 — 00t ��
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
(htti),//www.ncdc.noaa.gov/oa/mt)o/freedata.himi). Observations will be recorded with the date and time
of the observation and the depth of the 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.
S. Site Sketch (location of test holes and numbers)
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Updated 1/19/2016
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Wet Season Observations
Log Sheet
Owner Name:
Parcel Number:
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
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This form may be scanned and available for public view on the Mason County Web site.
Updated 1/19/2016