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Home My WebLink AboutBLD2008-00031 Geotechnical Report r S • STRATUM GROUP 1451 Grant Street,Bellingham,WA 98225 Phone(360)714-9409 November 9, 2007 James Mack Pearl 15070 Komedal Road J AN 2 5 2N8 Bainbridge Island, WA 98110 Re: Follow-up Geology Evaluation Tax Parcel 60103202, Deer Creek Road Jefferson County, Washington Dear Mr. Pearl: This letter is to address the questions you had regarding the site. I have reviewed the attached drawings of the proposed development of the site. The development of the site as proposed is consistent with my recommendations. In regards to past clearing on the site prior to Vincent purchasing the property, I have not observed any evidence that past clearing activities on the site have caused slope stability problems on or off of the site. Storm water dispersion/infiltration can be readily achieved by routing storm water to a dispersion/infiltration trench located at the base of the ridge south of the home site. I have noted the location on the attached map. Utilizing the route of the drainfield transport line as a trail will not cause slope problems. The location on the attached map is such that no slope problems of significance will be created. The further to the west the trail is located the better based on my site observations. We appreciate the opportunity to be of service to you. Should you have any questions please contact our office at(360) 714-9409. Sincerely yours, TT a• yea - b Str tum Group w.� �O . i .4110.4., t Dan McShane, M.Sc., L.E.G. • \ `2 Licensed Engineering Geologist " --__ ,:'O�: •, ` 447‘,.-- ',/>/o-) Dania! 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LatnmJ • . / , il§ • . _._.-- Sh ___ _ i.41‘.. ..., _____----MilaN 1 � <(IITJ_____---- _ __ im,. k,h, _______ mi . . . . ..._, • . cD\ c--lint § ,- t.t, %„ e. .l1pj-- mil=/ ,S 8 • • • STRATUM GROUP 1451 Grant Street, Bellingham, WA 98225 Phone(360)714-9409 S-� r-41 -ed July 18, 2004 Georgia Vincent (QtAfe 4584 Rockaway Bluff Bainbridge Island, WA 98110 Re: Geology Evaluation JAN 2 5 2Q08 Tax Parcel 60103202, Deer Creek Road Jefferson County, Washington Dear Ms Vincent: Stratum Group herein presents the results of our geology evaluation of the above referenced property on a shoreline bluff. The purpose of this geology evaluation was to 1) determine the suitability of the property for the siting of a residence, 2) qualitatively evaluate the risk of slope failures, and 3)provide general site development and maintenance recommendations for development of the property adjacent to a potentially unstable bluff. This evaluation was limited to a visual inspection of the property and vicinity, a visual inspection of the bluff slopes, review of available geologic mapping in the area, and inspection of the shoreline at the base of the bluff SCOPE OF SERVICES The scope of our services included the following: 1) Conducted a site visit to visually inspect the subject property including the bluff slope conditions, shoreline conditions, and relevant conditions in the vicinity of the property. 2) Observed surface soil conditions on the bluff face and on the uplands above the bluff by excavating shallow hand dug test pits. 3) Prepared this report summarizing our findings, including an evaluation of the feasibility of building a residence on the subject property, a qualitative evaluation of the shoreline bluff stability, recommendations for site development, and recommendations for further investigation, if necessary. • • July 18,2004 JAN 2 5 2008 Tax Parcel 601032020,Deer Creek Road,Jefferson County,WA Geology Evaluation GENERAL GEOLOGY Northwestern Washington has been occupied by continental glaciers at least four times during the Pleistocene Epoch(1.6 million to 10,000 years ago). During these glacial and accompanying interglacial periods, the underlying bedrock was eroded and a relatively thick layer of glacial related and interglacial fluvial sediments were deposited over the underlying bedrock in the vicinity of the subject property. The Geologic Map of Surficial Deposits in the Seattle 30' by 60' Quadrangle, Washington (Yount, Minard and Dembroff 1993)and Geologic Map of East-Central Jefferson County, Washington(Birdseye, 1976) indicate the subject property is underlain by and pre-Fraser glaciation stratified sediments. Both maps indicate recent alluvium deposits on the extreme northwest corner of the subject property. Observations on the subject property and vicinity are consistent with the above-described mapping. Most of the property is underlain by sand and gravel. Portions of the lower slopes of the property are underlain by very compact clayey silt that appears to be glacial till. The till is likely a pre Vashon glacial deposit and is likely the Possession Drift. The sand exposed on the bluff face consists of cross-bedded stratified deposits with no apparent silt or clay layers. The northwest most corner of the property immediately above the shoreline consists of an alluvial fan deposit with some evidence of old debris flow deposits. The Relative Slope Stability in East-Central Jefferson County(Birdseye, 1976) indicates the slopes on the subject property and area are areas of recent active landslides and unstable slopes. SPECIFIC SITE OBSERVATIONS The site location map is provided on Figure 1 and a general site plan sketch is provided on Figure 2. The property is approximately 6.2 acres in size. The property is accessed via Deer Creek Road, a private unpaved road. In addition to Deer Creek Road, a side road spur leads to a lower building area and to a bench area immediately above the beach on the west side of the property. Two locations were reviewed for building sites. Based on my conversations with you,the preferred site is located on a ridge near the north central portion of the property. A second location is at a lower leveled area part way down the shoreline access road. A third level area located at the end of the shoreline access road may be suitable for the construction of a house. However,this lowermost location has numerous limitations including the likely requirement of engineered designed retaining structures, size limitations, and environmental limitations in regards to setbacks from the shoreline and a stream. Other locations for building are present as well on some of the less steep slopes on the property. However,these areas were not evaluated in Stratum Group File:6.15.04 2 • • JAN2525 July 18,2004 Tax Parcel 601032020,Deer Creek Road,Jefferson County,WA Geology Evaluation detail and would likely require engineer designed retaining walls, as they would be cut into slopes. The primary desired home site is located on a ridge located on the north central portion of the lot. This site is accessed directly off of Deer Creek Road, which is located immediately to the east. The ridge consists of a leveled building site with slopes to the north and south. The ridge is approximately 150 feet long before beginning to taper and sloping downward towards the west. The level part of the ridge ranges between 45 and 50 feet wide. The slope to the north is approximately 30 degrees and 40 feet high at the highest. This slope is tree- and brush-covered primarily with evergreen huckleberry, ocean spray maples and fir. The slope to the south is approximately 20 feet high with an overall slope of 30 degrees. This slope has madrone and fir trees and alder trees. The brush is thinner and grass areas are present on this slope. Some of the alders are under stress due to an infestation of tent caterpillars this past spring. Both slopes appear to be stable and well drained as well as the graded ridge top. The slope to the east above Deer Creek Road on the subject property slopes up at approximately 40 degrees for 10 feet and then continues sloping up at an overall average angle of 20 degrees for several hundred feet. The slope above appears stable and no evidence of past slope movement is present. An additional suitable building area is located along the spur access road that leads across the property to the shoreline. The site is a leveled area near the southern edge of the property. Slopes above the leveled area are on the order of 25 degrees and are brush covered and have young trees. A steep shoreline slope is located to the west of this site. Most of the steep slope is tree-covered, but a few very steep areas underlain by very compact glacial till are bare of vegetation. The steep slope is the result of shoreline erosion at the toe of the slope causing the slope to be undermined. Due to the compact nature of the till,the rate of erosion is likely very slow. This slow rate is exhibited by the mature trees growing on the steep slope. The upland area between the level building area and the top of the steep slope is approximately 100 feet wide and is covered with mature second growth Douglas fir and a very thick growth of evergreen huckleberry. In addition to the home site I inspected the well site and the Deer Creek access road for potential areas of instability. The well is located in a west sloping swale between two small west plunging ridges. No evidence of surface water flow was observed within the swale. The swale appears to be an erosional remnant from shortly after the end of the ice age. The Deer Creek road cuts across numerous steep side slopes within a valley located south and southeast of the subject property. The road across the steep slopes consists primarily of full bench Stratum Group File:6.15.04 3 • • July 18,2004 JAN 2 5 203 Tax Parcel 601032020,Deer Creek Road,Jefferson County, WA Geology Evaluation cuts and side cast material has been placed primarily on slopes of less than 30 degrees. No areas of obvious potential road surface failures were observed. The steepest cut slopes are all excavated into very compact sand and sand and gravel. Raveling and periodic shallow slab type failures appear to have been and will likely to continue to take place on the steep cut slopes. Drainage and drainage relief culverts appear to well located to limit the risk of excessive erosion of the road or washouts at culverts. Maintenance of culverts and ditches appears to have been ongoing and this activity has limited the erosion of the road surface. CONCLUSIONS AND RECOMMENDATIONS Based on my inspection of the subject property and vicinity, I conclude that a structure can be built on either of the two building sites described above and indicated on the attached site plan sketch. Other building sites may be available, but will require further review and would likely require some geotechnical engineering design. It is my understanding that the septic drain field will be located on a slope of less than 15 degrees west of Deer Creek Road and south of the primary building site. The drain field at this location will not have any negative impacts on slope stability, as the volume of water will be minimal relative to natural inputs given the location and distance from the steep shoreline slopes. The development of the subject property will not cause any negative impacts on the stability of the slopes or the shoreline bluff as long as my recommendations are followed. Upper Building Site: The upper ridge building site may be utilized as long as home site does not extend beyond 150 feet from the western edge of Deer Creek Road. Beyond 150 feet the ridge begins to slope towards the west and the side slopes of the ridge become steep enough that setbacks from the side slopes will be required. The setback for the base of the foundation from the side slopes should be at least 5 feet. Soils at this site are well drained. Roof drains and any other drainage should be discharged to a water infiltration system that will distribute water into the ground. Lower Building Site: The level area part way down the shoreline access road is an acceptable building location such that it will not be at risk from future landsliding within the expected life of any structure as long as the structure is built at least 100 feet from the top of the steep landslide shoreline slope. Ground cover vegetation within the 100-foot buffer should not be disturbed. Trees within the buffer may be thinned or limbed for view purposes. However, if the trees are thinned, trees Stratum Group File:6.15.04 4 i • J M4 2 5 2008 July 18,2004 Tax Parcel 601032020,Deer Creek Road,Jefferson County,WA Geology Evaluation should be left on at least 30-foot centers. The mature trees on the slope are hydrologically mature and as such will greatly reduce the risk of the upper slope from becoming saturated. The trees also play a significant role in landslide deposit stability. That is large wood debris greatly slows the rate at which erosion of a landslide debris pile at the base of the bluff in the event that another landslide takes place. Soils at this site are well drained. Roof drains and any other drainage should be discharged to a water infiltration system that will distribute water into the ground. Please note that there are inherent risks associated with building on lots near or adjacent to steep slopes. These are risks that the building owner should recognize and be willing to accept. If conditions appear different than those described in this report, or other concerns arise, we request that we be notified so we can review those areas and modify our recommendations as required. We appreciate the opportunity to be of service to you. Should you have any questions regarding our reconnaissance please contact our office at(360) 714-9409. Sincerely yours, Stratum Group mo{ ash n2k: .,_\_/1.77 Dan McShane, M.Sc., L.E.G. i`' Licensed Engineering Geologist ` Eng!neetitto GeotoW. ' 1376 Daniel McShane Stratum Group File.6.15 04 5 • • . . 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