EXH2210034813

PCHBPollution Control Hearings Board of the State of Washington

Attached is a list of itemswe discussedclarifications. I think I notedthem all, but let me know if I've skipped any. Also, if I've missedthe point on some of these, let me know. Jim Kelley jckelley@parametrix.com Parametrix, Inc. Main: 425-822-8880 FAX:425-889-8808 Direct: 425-828-4202 extn 3315 AR 034813 ECYO0021953 Exhibit-2210 ' - Preliminary Draft - MEETING BETWEEN JIM KELLEY AND KATIE WALTER STIA ' April 12, 2001 9:00 am - 4:00 pm Tooics of Discussion: # 4-12-01 Issue 10-13-00 Issue Clarification Elevations ofhydroseeding At the Auburn mitigation site, hydroseeding can occur and waterlevels during summer and fall, when water levels are low, waters Contingency for planting can be held at 41 R the following winter to prevent long emergents in plugs term flooding of recently hydroseeded areas Radiusof influence and, HWA to provide info - preliminaryanalysis shows a small impact to adjacentwetlands radius of influence (as small as about 30 fl from the base of the excavation). Scott Bender conf'n-med this assessment is likely conservative. !3 Bioffltrationon NRMP sheet Flow from bioswale will not cause erosion, as the slope is 3.3 Appendix A- erosion gradual and the channel at the end of the swale is stabilized by dense sod. !4 Elevation of dispersal trench Sewer lines are buried well below the shallow grading relative to sewer line required to construct the dispersal trench. Sheets C4 and C2 - Sewer manholes must be protected during grading of the _-_ manholes- what will be Vacca Farm site, until the sewer line is abandoned. Upon…
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