Loading...
CANOD.pdfCity of Edmonds Critical Area Notice of Decision Applicant: Property Owner: Critical Area FilePermit Number.- - - (5" (' /0 "? 6 Site Location: Parcel Number: Project Description: ❑ Conditional Waiver. No critical area report is required for the project described above. 1. There will be no alteration of a -Critical Area or its required buffer, The proposal, is an allowed activity pursuant to ECDC 23,40.220, 23.50.220, and/or 23.80.040. The proposal is exempt pursuant to ECDC 23,40.230. ❑ Erosion Hazard. Project is within erosion hazard area. Applicant must prepare an erosion and sediment control plan in compliance with ECDC 18.30. Critical Area Report Required. The proposed project is within a critical area and/or a critical area buffer and a critical area report is required. A critical area report has been submitted and evaluated for compliance with the following criteria pursuant to ECDC 23.40.160: I The proposal minimizes the impact on critical areas in accordance with ECDC 23.40.120, Mitigation sequencing; 2. The proposal does not pose an unreasonable threat to the public health, safety, or welfare on or off the development proposal site; 3. The proposal is consistent with the general purposes of this title and the public interest; 4. Any alterations permitted to the critical area are mitigated in accordance with ECDC 23.40J 10, Mitigation requirements. 5. The . proposal protects the critical area functions and values consistent with the best available science and results in no net loss of critical functions and values; and The proposal is consistent with other applicable regulations and standards. 01 ❑ Unfavorable Critical Area Decision. The proposed project is not exempt or does not adequately mitigate its impacts on critical areas and/or does not comply with the criteria in ECDC 23.40.160 and the provisions of the City of Edmonds critical area regulations. See attached findings of noncompliance. Favorable Critical Area Decision. The proposed project as described above and as shown on the attached site plan meets or is exempt from the criteria in ECDC 23 .40.160, Review Criteria, and complies with the applicable provisions of the City of Edmonds critical area regulations. Any subsequent changes to the proposal shall void this decision pending re -review of the proposal. Conditions, Critical Area specific condition(s) have been applied to the permit number referenced above. See referenced permit number for specific condition(s). IA Reviewer Signatit Date Appeals: Any decision to approve, Condition, or deny a development proposal or other activity based on the requirements of critical area regulations may be appealed according to, and as part of, the appeal procedure, if any, for the permit or approval involved. Revised 12/16/2010 0 00 Cn (n Cn cn (n 0 0 0 0 0 0, O�^ MCO W 66 �gy qq I 6 /myo' w Q °& "his O"tJ O w >// °"0 Z S 0 ' c 0.2�N ip < © N a 0 U5 LLjLLI w QLU Lijw U O' WLij 0 U O Og W . w / a a a / >NLUOLLJ¢�UJO>Z C=_9avovm�w��Ftw7 LU O IL [L0 W O I¢- O d ¢ W �z KOOw \ \ wz awa �a \ \ N N 00 `u C)w �o` w s O Q o \\V \ o LLJ CR LJ 199. LLJ 06 w Lij VL w �<CL C) o N E- Ouj w 0— z m \ \` ¢Z w LIJ Z) LLJ y No N�UO �~ o aII II n tQ UN aol MC- OU JUw O O Mz�O Z Q \ NZ �(n a X W a 0 ui W= W co o N = U O W W O 2x`� ZQ SQ o z0�=w�m o Cl) NCL uj zz ro- aZZc�l~i OrZ-- z /� \ �¢z Oz N `4 0Lu 0z coaW 0 C \\ �g0 n� o hoc[¢ o o ZX z \6p� oS \ �rnw Mw w z °rF-JQ� w 00 ¢ Zz 0 ❑ Z to CDOw�O z"�Zm O \ ., IS r ti'% a, ,� My { ,�. "' a d I LIU & ASSOCIATES, INC. Geotechnical Engineering Engineering Geology May 12, 2014 Mr. Jim Henricks 336 SunsetAvenue Edmonds, WA 98020 Dear Mr. Henricks: Sulject: Critical Area and Geotechnical Report Single -Family Residences 336 and 340 Sunset Avenue Edmonds, Washington L&A Job No. 14-041 Regarding the comment in City of Edmonds 4/9/2014 review letter by Mr. Clugston, we have the following response: Item 1, — Seismic Hazard Geotechnical Report Imi! 11 I mww� M11`411, IM121 affl�,, I J��, Applicant: W. Jim Henricks, 336 Sunset Avenue, Edmonds, WA 98020. The western fringe of the residences at 336 and 340 Sunset Avenue, Edmonds, (referred to hereinafter as the properties), is mapped in seismic hazard areas. Presented in this report are the findings of the site conditions and conclusion of our seismic hazard evaluation of the properties. Site and Surrounding Land Use Description: 1'he general location of the properties is shown on Plate I — Vicinity Map. The properties are situated in a, nearly flat plain along the west coast of Edmonds. It is fronted by Sunset 19213 Kenlake Place NE a Kenmorej Washington 98028 Phone (425) 483-9134 . Fax (425) 486-2746 May 12, 2014 Critical Area / Geotechnical Report — Two Single -Family Residences L&A Job No. 14-041 Page 2 Avenue and adjoined predominantly by residential development to the north, south, and east. Project Area of Proposed Activity: The two properties sit side by side in the east -west direction. The terrain within these properties generally slopes down very gently westward at an overall average grade of about 4.5% grade across the properties. Geologically Hazardous Areas within 200 feet: The west fringe of the properties is mapped in a seismic hazard area. Seismic hazards normally include rupture of fault lines, soil liquefaction, lateral soil spreading, and slope failure from ground shaking in strong seismic events, 1. Site and Construction Plans The site and topographic plan of the properties is shown on Plate 2. This plan a. The seismic hazard within the properties and its buffers within 200 feet, if substantiated, are likely to impact the stability of the properties; b. The development on the properties is consisted of a single-family residence on each property; c. The topography in 2 -foot contour lines on the site plan shows the properties site is almost flat with a maximum 9 feet of drop from its northeast comer to its southwest comer over a horizontal distance of about 220 feet; d. Clearing limits — within boundaries of properties. May 12,2014 Critical Area / Geotechnical Report — Two Single -Family Residences L&A Job No. 14-041 Page 3 2. Assessment of Geologic Characteristics a. Geologic Setting The Geologic Map of the Edmonds East and Part of the Edmonds Wes Quadrangles, Washington, by James P. Minard, published by U. S. Geological Survey in 1983, was referenced for the geologic and soil conditions of the properties. The surficial soil unit at and in the vicinity of the properties is mapped as Whidbey formation (Q,) by this publication. The Whidbey formation soil unit on which the properties lie, are pre -Fraser Glaciation sediments composed of glacial and non -glacial flood -plain deposits of light -brown to gray, fine sand with silt, minor amount of clay, and occasional gravel and organics. These Whidbey formation deposits, generally underlying thin layers of topsoil and weathered soil, are normally very -stiff to hard in their native undisturbed state. They are also of extremely low permeability and tend to perch stormwater infiltrating into the overlying more permeable surficial soils. The perched groundwater may emerge out of natural slopes and man-made cuts where the Whidbey formation is exposed. When the amount of groundwater seepage increases in wet winter months, the emerging groundwater can erode and cause the soil mass in and above the seepage zone to erode and slough. The ground within the properties, however, is very gently sloped and, therefore, the possibility for groundwater seepage to occur within the properties should be rather unlikely. May 12, 2014 Critical Area / Geotechnical Report — Two Single -Family Residences L&A Job No. 14-041 Page 4 b. Surface Condition The properties and their surrounding areas within 200 feet to the north, South, and east, and the street fronting them to the west, are all very gently sloped. The properties currently are each occupied by a single-family residence. The -unpaved area around these structures is mostly covered by lawn grass. c. Soil Condition Based on our experience in the immediate vicinity of the properties, the properties are likely mantled by a layer of topsoil about 12 to 18 inches thick or by fill up to about 2 feet thick with a thin layer of relic topsoil underneath. Underlying the topsoil is a layer of weathered soil of brown to light -brown, medium -dense, silty fine sand with trace gravel, about 2 to 3 feet thick. This weathered soil is underlain by a Whidbey formation consisting of medium dense to dense silty fine sand or very -stiff fine -sandy to clayey silt. d. Groundwater Condition Perched groundwater may exist on top of the underlying Whidbey formation of extremely low permeability. This perched groundwater is from storinwater infiltrating into the more permeable surficial soils. The amount of and the depth to the near -surface perched groundwater would fluctuate seasonally, depending on precipitation, surface runoff, ground vegetation cover, site utilization, and other factors. The near -surface perched groundwater may dry up completely during the dryer summer and fall months and accumulate and rise in the wet winter and early spring months. May 12, 2014 Critical Area / Geotechnical Report — Two Single -Family Residences L&A Job No. 14-041 Page 5 3. Analysis of Proposal a. Project Description The residences on the properties are of wood -framed structures, supported or to be supported by footing foundations constructed on the underlying dense and/or very -stiff Whidbey formation soils. b. Evaluation of Geologic Hazards Erosion and landslide hazards The terrain within the properties is very gently sloped. Therefore, the erosion and landslide hazards of the properties should be minimal. Seismic Hazard The west fringe of the properties is mapped in seismic hazard areas. Seismic hazards include rupture of fault lines, soil liquefaction, lateral soil spreading, and landslide. The properties are practically flat; therefore, their lateral soil spreading and landslide potential should be minimal. The properties are not in close proximity of known fault lines; therefore, their hazard from fault line rupture should also be minimal. Liquefaction is another form of seismic hazard. r' of soils most susceptible to liquefaction during a strong earthquake is saturated, loose, fine sand to silty fine sand deposits. Such loose fine-grained deposits, when subjected to strong ground shaking, can be densified and decrease in volume. If water in the deposits is unable to drain quickly, pore water pressure in the I May 12, 2014 Critical Area / Geotechnical Report — Two Single -Family Residences L&A Job No. 14-041 Page 6 deposits would increase. When the pore water pressure continues to build up by prolonged ground shaking, a "quick" condition will be reached when the pore water pressure equals the effective overburden soil pressure at some depths in the deposits. Under this condition, the sand deposits would turn into a liquid state and lose its load bearing capacity, The Whidbey formation soils of dense silty fine sand and very -stiff fine sandy to clayey silt, underlying the properties at shallow depth, are of moderately -high to high cohesion and would not decrease in volume substantially during ground shaking from strong seismic activities. Therefore, pore water pressure in these soils do not build up quickly and significantly to cause soil liquefaction. Therefore, in our opinion, the liquefaction hazard of the site should also be minimal. iiiiiii� ilillpill ► III illillillill 11111 11111111111 11�11111111111 I I 1 111,141! ; rfllfflllllinllj� The properties are very gently sloped and the seismic hazard of the properties is low. Therefore, no further building setback is necessary other than the normal None required, We are pleased to be of service to you on this project. Please contact us if you have N iZ 165TH ry C��' Q� r 10aTn ati H�KiT E ,1� N ,rL SL 167TH I sW 1 Ctti ;° r1;z 5T 3v :j: 16TH � ¢ 169TH ST sW ' v W ER S BI ARE PL 19D w TT SN KL CHERR ST ti� 1q0"19TL=0� 191ST D( - 13 X95 1 Q o ( 192ND S1 _.A / ojnrttT B FORESTna� DEL 1 I PL s0 r0 DR EXCEL I OR Dt�sa 196TH 3 967 PUGET P U E , DF "ST SN 8600 MELODY LN WY .f hLEWQ 1 rHINDLEY V EWLAND WY t�p 6ROOKAIERE iio a s r a. biro DR 6ROOKMERE ST EDMOND,S z ST SW uNaERwArER SPE S ST Y1EOR PARKDILTNER U VISTA �` onn �.__ •'A W( 200TH ST SW I' 1 ATE1 PROJET Ca5CAN 201ST L s BRACKETTS Wi ALOHA i S1EkRA s _- w uss 202ND LANDING ST 17. ®. _151._ '�� � z0zr� P i ST SW .- a v sw BEACH tib' > rOLEN ST, g �ti SIERRAi ST; r ,t�a h t ur asDALEY s�. �"' ST t _ a � e {® 204 11 tsar Tetrutut� ` ' s IV1G a�,` c�, c IUs j �1 / ( ��o S Swl zC ��i �eE StiQ 'CTR ` ' SPRAGUE e ST cn� ewcxc7s 4 �L �� JIM Ir v0 ` sr a r. rs ELL E HDs ST HILL1 E sT H �J T ,.,.. r Ew. a `. 9 @ �' a LL t - 2p%[II Cy S v a atc S m 1 207TH r ;v b i�tP C,` 1 O IIIS7 � a ST � DR x 12 7TH PL 541 ,._ �� rus ATN ST _a. �IvLsw I uE m_. *, S TlCiY N "' DAYTON tea ent a ST in 1 •a) r cin woiE tr+ { Y,OST a a 209711 PL MAPLE LI) 5T t MEMORIAL sw s Q ALDER ti 507 3G I 17 > ¢ ti ALOE I T� e JzAR✓�� a ruw a� UNION v V) W LNUT _ w 'j get €" �q� /F�! C`v ! ark, s FS aIu HOLLY DR CEDAR ST C AR PL ��� PARK /I HOWELL WY � PIA m jN ®C®=4 MARSH ®{O au tri pR to } Y E SPRUCE ST 4 J RD p4O44EERJiIF°Qi �1N Pt ¢ REt a b 214`f i, HEMLOCK Nt„ y IgV! HEMLOCK NY. ST 214 H �UL < s s 215TH DR °'S Otr1 LAUREL t%v aL nt 2157111 ST L S ° 215tH 6 SW lye L1J ST �tsTn — _. �.S.T zt6rn sT�u 16TH �.ST jr, ,„ q',rti 2 5 P5w 217TH STSW MAKAH ( (.� " LM ¢ 03 y, s 217TH PL Sof FIR x to F R 5T �' 21OTII� a' 21�TH �T H� 26 I ¢ PL F[R ,PL g�.p S41 rt €9�(� ®y 9 pj L I 4J s BELLA COOLA I q in ST uY� E rn ST `J ' ��x 22 THwY r`aT r.� EWK_f _ e r� 21O7i lTCOMN Q ip P pan W P e N4 Ga e 11 aT5ti zzas1 ?21 7 BIRCH 01 C'lii ��PL x kI 2 [ n w H vN 006N000 iRU 5, 13T N VICINITY MAP IA.TES, WC. SIL-FAMILY RESIDENCES 336 AND 340 SUNSET AVENUE Geot®chnicel Engineering - Engineering Geology - Earth Science EDM®NDS, WASHINGTON a .04"9LM N 3 .0t.u.1c N .019W N ON301SEW 3sOdO C) LLI 0 C) k Z M z 0 CK LU n 06 w z Im Z V all rn z LL, IL 0 x x LU 2 Z, t I I � w Uj Uzi ZZ, r I w 9 L 80 .0 Cu ru N z ru Sao uj 0 E Z Z z , 2 T f2 a Uj P w ui x IX Z WU) ui w @ < —0 '0 ci ii F, vifl 0— 0- B L,66 w Z LU 0 v�ie, mpphD 0 U) 4 V .00-0+C NrvA HIM 05 3 "ALIC N nll� FZ P w h (D 0 w C�z (-iS iNO,,J.J) ']AV i]SNns � 8,< < C4 F -- Z t -L 0 z gw§ 0 z OV5 z o 0- 0 08� :M>iz 12 Q) z N -10 ui Z Z z , 2 T f2 a F -- Z t -L 0 z gw§ 0 z OV5 z o 0- 0 08� :M>iz 12 Q) z N -10 ui LIU & ASSOCIATES, INC. Gootechnical Engineering Engineering Geology July '18, 2014 Mr. Jim Henricks 336 Sunset Avenue l'i'dmorlds, WA 99020 Dear Mr. 1-lenricks: Su)ject: Critical Area and GeotcOnical Report Single -Family Residences .:i,36 andSunset Avenue Edmonds s, Washington L Job No, 14-011 Regarding the comment in City of Edmonds 4/9/2014 review letter by Mr, Clugston, we 11"we the following responses: 23.40.090 - CRITICAL AREAS REPORT D.1 Applic,nrlt:.Mr. Jim 11mricks, 336 Sunset Avenue, Edmonds, WA 98020. D.2 a, Site Plan - :Plate I attached (covering both prop(,,,,rljcs), A sirigle-farnfly resid6nec', is bcinj,Y or to be developed on cm-,.hpro perty, b. Storm Water Managenicrit Plao -- 8wrm runoff collected over hripervious surfilces of both residences is to be disdarged directly into cj[Y9,s stop -11 sewer 'system per design plans, 19213 Kerdake Plact,,,n NE - Kenviriorec', kfifashington 98028 Pht,)ne (d,1.25) 48'.31,,,9134 Fax (425) 406-2746 d July 18, 2014 Critical Area / Geotechnical Report — Two Sitigle-Family Residenccs L&A Job No. 14-041 Page 2 D,3 Report prepared by: J. S. Liu, geotechnical engineer, P.E., with Liu & Associates, Inc. Report prepared based on review of a published geologic map, a site reconnaissance, and soil condition encountered in a utility trench excavated on the east property (336) on which a residence is currently being constructed. DA — Geologic Hazard Identified According to City of Edmonds Critical Areas Map, the western portion of the subject project site is mapped in seismic hazard areas. 17.5 — The project sites are flat to very -gently sloped. The soils underlying the site are not prone to liquefaction. Therefore, scismic, hazard, such as landslide, soil lateral spreading, liquefaction, for the sites is minimal and no mitigation is required (See Geotechnical Investigation report under 23,40.120 below). D,6 — No mitigation is required. The two properties sit side by side in an cast -west direction. The topography survey plan with 2_1'oot contour lines (see Plate 1) shows the properties are almost flat with a maxii-nurn 9 feet of drop from its northeast comer to its southwest corner over a horizontal distance of about 220 feet, 'f Ire terrain within these properties generally slopes UU & ASSOCIATES, INC. July 18, 2014 Critical Area / Geotechnical Report — Two Single -Family Residences L&A Job No. 14-041 Page 3 down very gently westward at an overall average grade of about 4.5% across the tn properties. The properties and their surrounding areas within 200 feet to the north, south, and east, and the street fronting them to the west, are all either flat or very gently sloped. A single-family residence is currently being or to be developed on each of the two properties. The unpaved area open areas on these properties will mostly be covered by lawn grass and shrubs. Geologic Setting The Geologic Mata of the Edmonds East and Part of the Edmonds West Quadrangles, Washington, by James P. Minard, published by U. S. Geological Survey in 1983, was referenced for the geologic and soil conditions of the properties. The surficial soil unit at and in the vicinity Of the Properties is mapped as Whidbey formation (Q,,,) by this publication, The Whidbey formation soil unit on which the properties lie, consists of pre -Fraser Glaciation sediments composed of glacial and non -glacial flood -plain deposits of light - brown to gray, fine sand with silt, minor amount of clay, and occasional gravel and organics. These Whidbey formation deposits, generally underlying thin layers of topsoil and weathered soil, are normally very -stiff to hard in their native undisturbed state. They are also of extremely low penneability and tend to perch stormwater infiltrating into the overlying more permeable surficial soils. The perched groundwater may emerge out of' natural slopes and inan-inade cuts where the Whidbey formation is exposed. When the amount of groundwater seepage increases in wet winter months, the emerging groundwater can erode and cause the soil mass in kind above the Seepage Zone to erode LIU & ASSOCIATES, INC. July 18, 2014 Critical Area / Geotechnical Report — Two Single -Family Residences L&A Job No. 14-041 Page 4 and slough. The ground within the properties, however, is very gently sloped and, therefore, the possibility for groundwater seepage to occur within the properties should be rather unlikely. ' A sewer line trench has been excavated along the south side of the east property. ']'his trench encountered a thin layer of top soil and a layer of weathered soil of light -brown, nwdiurn-dense, gravelly, silty, fine sand. This layer of weathered soil is underlain to the bottom of the trench by a light -brown to light gray deposit of hard, fine -sandy to clay silt, which appears to be of Whidbey formatiort. This soil condition is comparable with our experience of the soil condition in the immediate vicinity of the subject properties. Groundwater Condition The sewer line trench did not encountered groundwater. However, perched groundwater may exist on top of the underlying Whidbey formation of extremely low permeability, This perched groundwater is from stormwater infiltrating into the more pell-neable surficial soils. The amount of and the depth to the near -surface perched groundwater would fluctuate seasonally, depending on precipitation, surface runoff, ground vegetation cover, site utilization, and other factors. The near -surface perched groundwater may dry up completely during the dryer summer and fall month,,; and accumulate and rise in the wet winter and early spring months. Seismic Hazard Evaluaflon The west fringe of the properties is mapped by City of Edmonds in seismic hazard areas. Seismic hazards include rupture of fault lines, soil liquefaction, lateral soil spreading, and landslide. The properties are flat to very gently sloped; therefore, the potential for lateral LIU & ASSOCIATES, INC. July 18, 2014 Critical Area / Geotechnical Report — Two Single -Family Residences LSA Job No. 14-041 Page 5 soil spreading and landslide to occur on the properties should be minimal. The properties are not in close proximity of known fault lines; therefore, their hazard from fault line rupture should also be minimal. Liquefaction is another form of seismic hazard. The type of soils most susceptible to liquefaction during a strong earthquake is saturated, loose, fine sand to silt), fine Sand deposits. Such loose fine-grained deposits, when subjected to strong ground shaking, can be densified and decrease in volume. If water in the deposits is unable to drain quickly, pore water pressure in the deposits would increase. When the pore water pressure continues to build up by prolonged ground shaking, a "quick" condition will be reached when the pore water pressure equals the effective overburden soil pressure at some depths in the deposits. Under this condition, the sand deposits would turn into a liquid state and lose its load bearing capacity. The Whidbey formation deposits of hard fine -sandy to clayey silt underlying the properties at shallow depth are of high cohesion and shear strength. They are not susceptible to decrease in volume during ground shaking ftoln strong seismic activities. Also, there is a lack of constant and extensive groundwater table under the properties at shallow depth. Therefore, the chance for pore water pressure in those soils to build up and lead to soil liquefaction is nil. Therefore, in our opinion, the liquefaction hazard of the properties should also be minimal. Based on the above analysis, we concluded that: A — No construction activities from development would degrade critical areas. B -- No requirement specific to critical area type is needed. LIQ & ASSOCIATES, INC. July 19, 2014 Critical Area / Geotechnical Report — Two Single-Farnily Residences L&A Job No. 14-041 Page 6 1. No construction activities from development would degrade critical areas. 2. No steps would be necessary to rninimize impact on critical areas. 3. No rectifying measures are require(]. 4. No restoring or stabilizing actions required, 5. No special preservation or maintenance measures required. 6. No compensating measures required. 7. No monitoring programs required. We are pleased to be of service to you on this prqject. Please contact us if you have questions. Attached: Plate I — Site Plan Yours very truly, J. S. (Julian) Lin, Ph.D., P.E. Consulting Geotechnical Engineer r da V to INOW-) '-]AV IAA-Nns Ott ic" z 'U7 o = i3 0 z to to ah L ti: >� L, 10 l qJ to 0 11 LU V, w0 aua 109 LIU & ASSOCIATES9 INC. Gootechnical En�jineorinq Engineering Geology ,laxly 21, 20 1 d mr, .ling Heuricks 336 Sunset Avenue L',dmonds, WA 98020 Dear Mx, Henricks: Sub�ject: Response to Comments in 7/1/2014 City's ReviewLetter Single -Family Residence,,; 330 andf310 Sunsc( Avc-nue Edmon6s""Washington L&A.Tob No, 14-041 Enith Science -v 4 Regardijig the coil) ine nts in City of Edmonds 7/1/2014 review letter by Mr. Clugstoi), we, have the f6llowij-jg responses: 1, Soil Cl,-MifiGAOD Unified Soil Classification System (DIOA COMIT10111y used by geotechnical engineer,,,) in combination with soil unit identifications in [,,eologic maps published by U 8, Geological Survey (Inost com-monly cased by geologists and geotechnical oj�igineers) are used in classifying soil units fit the subject project sites in our geoloohnical investigation report, UCS 91)d tJ15GS classify soil units based on Iticir geologic formation, colliposition, and physical an(l mechanical characteristics, and meal with soil units with thicUess flon, a f( -,,\v fort to over tOO feet thick, They are very useftil in geotechnical ClIgiDOering analysis, ssola as stability;, bearing capacity,, compressibility, erosion potential, pernleability, etc., and are pvcf.(,,,nvd systems by ,KV,T3Y r agaaq rr Place NE ° Kenpvicm-(-,,, 98028 Phono (425) 483-.9,134 - Fax (4,26) 486-2746 July 21, 2014 Critical Areas Report — Two Single -Family Residences L&A Job No. 14-041 Page 2 geotechnical engineers and geologists, MRCS Classification System, on the other hand, is mainly for agriculture use and only deals with the top 5 feet of soils. 2, Critical Areas Report The Critical Areas Report was revised and attached hereto. It is for development of new residences at 340 (under construction) and 336 (to be constructed) Sunset Avenue. A geotechnical investigation report is embedded in the Critical Areas Report. Please contact us if you have questions. Attached: Critical Areas Report Yours very truly, I'lu 4'0CIA2!5, INC. J. S. (Julian) Liu, Ph.D., PR Consulting Geotechnical Engineer i LIU & ASSOCIATES, IN(--.