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Heritage Hill Plat, Proposed Heritage Arnold Project
Bennett Corporation A 9930A September 9, 1999 Page 9 6.1 Federal Records Sources 6.1.1 NPL One site within a one-mile radius of the subject property is found on the National Priority List. That site, Pacific Car and Foundry at 1400 North 4th Street, is located approximately one mile to the north. Based upon its distance from the Heritage Arnold property and its crossgradient hydrologic position, any risk it may pose appears to be very low. 6.1.2 CERCLIS A review of the EPA's CERCLIS listing reveals no active sites within approximately one- half mile of the subject property that have been designated as potentially hazardous or eligible for participation in the Superfund cleanup program. 6.1.3 ERNS The subject property does not appear on the Emergency Response Notification System (ERNS) database of spill response activities. 6.1.4 FINDS A review of the Facility Index System (FINDS) listing and the EPA's RCRA Notifiers list, along with our site and area reconnaissance, reveals no RCRA-regulated businesses on the subject property, on adjacent sites, or within a one-eighth mile radius. 6.1.5 TSD A review of the RCRIS-TSD list shows no sites within a one-mile radius of the subject property. 6.2 State Records Sources 6.2.1 WDOE Underground Storage Tanks A review of the WDOE listing of underground storage tanks (USTs) reveals no registered USTs on, or adjacent to, the subject property. 6.2.2 WDOE Leaking Underground Storage Tanks A review of the current Leaking Underground Storage Tank (LUST) list reveals no sites within a half-mile radius of the subject property that have reported releases of petroleum into the environment. 6.2.3 WDOE Hazardous Site Listings A review of the WDOE Confirmed & Suspected Contaminated Sites (C&SCS) report GEOTECH CONSULTANTS. INC. Bennett Corporation JN 9930A September 9, 1999 Page 10 shows one site within an approximate one-mile radius of the subject property that has been designated as a confirmed hazardous substance site. This site, Northwest Pipeline at 800 South 21 st Street, is situated approximately seven-eighths of a mile to the southwest, in a crossgradient hydrologic position. Based upon the distance separating it from the Heritage Arnold property and upon its relative hydrologic position, it is not considered a source of potential contamination to the subject property. 6.2.4 WDOE Toxics Site Listings A review of the WDOE Toxics site listing shows two sites within a one-half-mile radius of the subject property that have submitted reports to WDOE describing independent cleanup activities. Both sites are approximately one-half mile from the subject site, and are in cross- to downgradient hydrologic positions. Based upon the distances separating them from the Heritage Arnold property and upon their relative hydrologic positions, they are not considered sources of potential contamination to the subject property. 6.3 Local Agency Sources A statewide listing of municipal solid waste facilities does not record any active landfills in this area. A review of the Seattle-King County Health Department records pertaining to current and abandoned landfills within the county suggests that two closed landfills are located within one mile of the subject property. The Mount Olivet Landfill is located three-quarters of a mile to the north- northeast, and the.Renton Highlands Landfill is located approximately one mile to the northeast. Both landfills are located across Maple Valley from the subject site. Based upon the distances separating them from the Heritage Arnold property and the intervening valley, they are not considered sources of potential contamination to the subject property. 6.4 Assumptions and Opinion of Contaminant Mobility and Site Vulnerability No sites confirmed to be contaminated by hazardous waste lie within 1,000 feet of the subject property in an upgradient hydraulic position. As such, it is our professional opinion that the potential for the migration of theoretical water-borne contamination onto the subject property is very low. 7.0 RESULTS OF INVESTIGATION We performed a Phase 1 Environmental Site Assessment, consistent with the scope and limitations of ASTM Designation E 1527, for the property at Beacon Way Southeast in Renton, Washington. 7.1 Findings This assessment revealed no evidence of recognized environmental conditions in connection with the property. GEOTECH CONSULTANTS, INC. Bennett Corporation JN 9930A September 9, 1999 Page 11 7.2 Conclusions and Recommendations As stated earlier, the northern portion of the property was excavated, then filled with as much as 12 feet of imported material that included construction debris. It may be prudent to include a contingency in development plans, should contaminated material be discovered during future excavation. 7.3 Limitations This report has been prepared for the exclusive use of the Bennett Corporation, and its representatives, for specific application to this site. This work was performed in a manner consistent with that level of care and skill normally exercised by members of the environmental science profession currently practicing under similar conditions in the area. Our work is in accordance with our Fee Schedule and General Conditions and our signed proposal, which is dated August 18, 1999. 8.0 REFERENCES Bishop, Greg, Turnberg, Wayne L., and VanDusen, Karen. Abandoned Landfill Study in King County. Seattle-King County Department of Public Health. Seattle, Washington. April 1985. Department of Interior, U.S. Geological Survey. Topographic Map of the Renton, Washington Quadrangle. 1983. Division of Radiation Protection, Department of Health, State of Washington. Radiation Fact Sheet. HartCrowser, Inc. Abandoned Mine Assessment, Heritage Arnold Property, Renton, Washington. August 16, 1999. King County, Environmental Division. Sensitive Areas Map Folio. December 1990. Office of Research and Development, U.S. EPA. U.S. EPA Ground Water Handbook - Volume I.- Ground Water and Contamination. EPA/625/6-90/016a. September 1990. Waldron, Howard H., Liesch, Bruce A., Mullineaux, Donal R., and Crandell, Dwight R. Preliminary Geologic Map of Seattle and Vicinity, Washington. U.S. Geological Survey. 1962. GEOTECH CONSULTANTS, INC. U 1'•J�thl eticur^ i, I I Meld t0 ) 1 i 306. �_! ", -- i ■ INGreenwood Cetri - � ;;I a it BM pj • i\ asebatf \( r Ce -y Park ;\ N \ -�• R{c L I PIT n l' •� • O r \�. ■ � 1 � -�- -_ /r ,��- -- �_ __ ram-'-•-- \ _..``�;t:• ' /�• \i lJ - �SC , •> �'' ` `� �`` `b34„ tom. F�. •�\ �� ya o \ u I .•II�P M •1. I - — ---- 6 ° :ervoir MIA w •\. N Scale 0 1/2 1 mile Inferred Direction of Shallow Groundwater Flow (Source:U.S.Geologic Survey map of Renton,Washington Quadrangle,1973) VICINITY MAP GEOTECH Proposed Heritage Arnold Project - CONSULTANTS,INC. Beacon Way Southeast Renton,Washington Job No: Dzt� Pfate: 99330A SepL 1999 1 N River Ridge residential development .—.—.—.—.—.—.—.—.—.—.—.—.—•—•—•—•—•—•—•—•—•—•—••+ ; .♦•♦ brambles trees and 1 gates♦. % '�.� brush j steep,wooded slope ♦ It approximate area •♦ of excavation 1 °4�,�♦•♦ --------------------------- parking d�f�•♦ ��''----- 1 lot @dco♦ j ♦. d♦; brambles 1 1 �♦ trees and 1 Philip brush 1 Falcon Arnold °� �♦ = 1 Ridge Park oC% residential ad 1 development oe�.♦ j baseball fields d�0, -�'�• J undeveloped land SITE PLAN GEO'I'ECH Proposed Heritage Arnold Project ~` CONSULTANTS,INC. Beacon Way Southeast Renton,Washington Job No: Dates Plaf- 99330A Sept 1999 No Scale 2 - tii: �w�,F e i••: s . e I � / 7 ai 1.ate �: �,`• � si,���S�p'ss!!���i+'�4' �3Y• r N dry ) `r- • •• / I • 1 I • f 1' I •• I I N, v ;•;• �. •f f i r,..ate tt"�'F ,.�. .g:�.\� � � •ate'„� '�+tY t. ,�`4 ,h{X�,.p .a,• • R i +r 2 ��e 1- � { k,,.-y•a � :�!1��•1l^ri �4«�e� � f C 4 •C" -t �.+� "` �'�•' tK�f t, ,�` c� f,: '� is� I'� y�i. - x r�r APPENDIX V/S's Site Assessment GEOTECH CONSULTANTS, INC. SITE ASSESSMENT REPORT PROPERTY CLIENT INFORMATION INFORMATION Project Name/Ref#: 99330A Ryan Fike Proposed Heritage Arnold Project Bennett Corporation Beacon Way Southeast 9 Lake Bellevue Dr., Suite 204 Renton, WA 98055 Bellevue, WA 98005 Latitude/Longitude: 47.473422, 122.192681 Site Distribution Summary within vs 118to 114to 112to mile 114 mile 112 mile l mile Agency/Database -Type of Records A) Databases searched to 1 mile: US EPA NPL National Priority List 0 0 0 1 US EPA CORRACTS RCRA Corrective Actions and (TSD) associated TSD 0 0 0 0 STATE SPL State equivalent priority list 0 0 0 1 B) Databases searched to 1/2 mile: STATE SCL State equivalent CERCLIS list 0 0 0 - US EPA CERCLIS/ Sites currently or formerly under NFRAP review by US EPA 0 0 0 - US EPA TSD RCRA permitted-treatment, storage, disposal facilities 0 0 0 - STATE LUST Leaking Underground Storage Tanks 0 0 0 - STATE SWLF Permitted as solid waste landfills, incinerators, or transfer stations 0 0 0 - STATE TOXICS Washington Site Register 0 0 2 - G) Databases searched to 1/4 mile: STATE UST Registered underground storage tanks 0 0 - - D) Databases searched to 1/8 mile: US EPA ERNS Emergency Response Notification System of spills 0 - - - US EPA LG GEN RCRA registered large generators of hazardous waste 0 - - - US EPA SM GEN RCRA registered small generators of hazardous waste 0 - - - For more information call VISTA Information Solutions, Inc. at 1 -800-767 -0403. Report ID: 99330Al 11 Date of Report: September 3, 1999 Version 2.6.1 Page 11 This report meets the ASTM standard E-1527 for standard federal and state government database research in a Phase I environmental site assessment. A (-) indicates a distance not searched because it exceeds these ASTM search parameters. LIMITATION OF LIABILITY Customer proceeds at its own risk in choosing to rely on VISTA services,in whole or in part,prior to proceeding with any transaction. VISTA cannot be an insurer of the accuracy of the information,errors occurring in conversion of data,or for customer's use of data. VISTA and its affiliated companies,officers,agents,employees and independent contractors cannot be held liable for accuracy, storage,delivery,loss or expense suffered by customer resulting directly or indirectly from any information provided by VISTA I NOTES For more information call VISTA Information Solutions, Inc. at 1 -800 -767 -0403. Report ID: 99330Al11 Date of Report:September 3, 1999 Version 2.6.1 Page 12 SITE ASSESSMENT REPORT Map of Sites within 1 Mile TN t. ' N 14t S+. o r t I ••'• o N tic -tea 2n t -, Ne 3rd St W e 2nd St O TO St a, , E S dSt z °% U) St to H .101, �._ St 7 D lam' yKy 16 �/ - S 61 S o� L 2 _. r t S > a 151 t V) 18th S o ��� e a) \� S 191 St a �' 57 f.. S 2 t P o ) D Cn 1 Se S d St e t Se n S .,e 0 0.25 0.5 c 26\ St t S 2 t e 163rd Miles Category: A B C D Subject Site Databases Searched to: 1 mi. 1/2 mi. 1/4 mi. 1/8 mi. Single Sites E A O Multiple Sites 0 \/\ Highways and Major Roads NPL,SPL, CERCLIS\ UST ERNS, Roads CORRACTS NFRAP, GENERATORS y_y Railroads (TSD) TSD, LUST, Rivers or Water Bodies SWLF, SCL Utilities For More Information Call VISTA Information Solutions, Inc. at 1 -800-767-0403 Report ID: 9933OAl11 Date of Report: September 3, 1999 Pax#3 SITE ASSESSMENT REPORT Sites Represented as Polygons Q N 4t. ` y o 1n f -T1 Ne 3rd St - e 2nd St \ o o To St a' S 2 d St ' CD U y St ite HX 0 ... D 16 0� 1'-.y......_ S S(h S� S 6ff S 7ff S > d cD = i z G��d W '-� o '� ��q •'` CD 1 4 151 t cn \ Q V) -O Q; V) 181h S Q, \ _0 0 S 19t St 1� Q s e 57 S S2t P o - 1 Q) � cn 1 } 1 Se N 5 d St 0 2 e t Se n S -� e Q' 0 0.25 0.5 S 26{ St -D t S 2 f e 163rd Miles These boundaries are approximated from agency records or other sources such as published maps. They may represent property boundaries, impact zones, or study areas. For more information contact the agency referenced by source number in the site listing. �\ Highways and Major Roads Roads Subject Site �, h Railroads Rivers or Water Bodies Utilities For More Information Call VISTA Information Solutions, Inc. at 1 -800-767-0403 Report ID: 99330Al11 Date of Report: September 3, 1999 Pax#4 W nor,& SITE ASSESSMENT REPORT ,W/,ffd Val Street Map _+ z N t N 4th St. D \ o - rio -t o N tl 2n t , Ne 3rd St e 2nd St o � , Q, To St CD ^ E Fn � S2dSt 2 < St to H 0 N n �x OfP y D o by 16 �l CD �0 •' y......_..•- Sth St e` a - - t S Q a\ 6 = 66q�q ` < , 0)-15 CD 0 � 1 4 15t �Q ti G v� O < 18th S v S 19t St N L e 57 S 2 t F p a3 � U) c } 1 Se v' C d St Q) e t Se n e °' \" 0 0.25 0.5 o t S 2 t S 26{ S{ e 163rd Miles Highways and Major Roads Subject Site Roads Railroads Rivers or Water Bodies Utilities For More Information Call VISTA Information Solutions, Inc. at 1 -800-767-0403 Report ID:99330A111 Date of Report: September 3, 1999 Page#5 SITE ASSESSMENT REPORT SITE INVENTORY A B C D PROPERTY AND THE ADJACENT AREA p^ a MAP (within 1/8 mile) y ID U z N N Z W VISTA ID � U �. � U �' c7 0Z DISTANCE ii O a U W 0 x H Z DIRECTION Z U v> CA U H W _j 0 No Records Found A B C D SITES IN THE SURROUNDING AREA p^ MAP _(within 1/8- 1/4 mile) C ID V Z N Cn Z W W VISTA ID DISTANCE c O, a U W O H C9 DIRECTION Z U in in U F- v1 W ._j to No Records Found A B C D SITES IN THE SURROUNDING AREA p^ MAP (within 1/4-1/2 mile) C ID U Z N N Z W J W VISTA ID U F W U H t7 (9 DISTANCE a O J J u�i y J X z h DIRECTION Z U- vai H U B cn W H STONEWAY CONCRETE RENTON 6808683 1 1915 SE MAPLE VALLEY HWY 0.47 Nr X • RENTON,WA 98056 PUGET SOUND POWER LIGHT RENTON 342043 2 620 S GRADY WAY 0.48 I X • RENTON, WA 98055 A B C D SITES IN THE SURROUNDING AREA p MAP (within 1/2-1 mile)` C ID V z z _N N Z W W VISTA 10 U W U N U (� DISTANCE p O a U W 3 O I.- C7 DIRECTION Z U U _j _j> to NORTHWEST PIPELINE SEATTLE 2883006 3 800 S 21 ST ST 0,87 M; X I • RENTON, WA 98055 X=search criteria; • =tog along (beyond search criteria). For more information call VISTA Information Solutions, Inc. at 1 -800-767 -0403. Report ID: 99330Al 11 Date of Report: September 3, 1999 Version 2.6.1 Page 16 A B C D SITES IN THE SURROUNDING AREA p^ MAP (within 1/2- 1 mile) `" ID U z h y u W J VISTA ID U ►L. U H U (� DISTANCE a O a V W ?� h z (D DIRECTION Z U in H U f- J N ►- = W J V) PACIFIC CAR FOUNDRY CO 4864595 4 1400 N 4TH ST 0.99 MI X • RENTON, WA 98055 X =search criteria; • =tog along (beyond search criteria). For more information call VISTA Information Solutions, Inc. at 1 -800-767 -0403. Report ID: 99330Al11 Date of Report. September 3, 1999 Version 2.6.1 Page 17 A B C D of a UNMAPPED SITES N Z V � y V 'Z'^ ,Z,^ J J J Q N J x z V V. a 0 a V W y VISTA ID Z U y y U ►y- w No Records Found X=search criteria; • =tog along (beyond search criteria). For more information call VISTA Information Solutions, Inc. at 1 -800-767 -0403. Report ID: 99330Al11 Date of Report September 3, 1999 Version 2.6.1 Page 18 SITE ASSESSMENT REPORT DETAILS PROPERTY AND THE ADJACENT AREA(within 1/8 mile) i No Records Found SITES IN THE SURROUNDING AREA(within 1/8 -1/4mile) I No Records Found SITES IN THE SURROUNDING AREA(within 1/4 - 112 mile) VISTA STONEWAY CONCRETE RENTON VISTA ID# 6808683 Map ID Address': Distance/Direction: 0.47 MI/ N 1915 SE MAPLE VALLEY HWY plotted as: Point RENTON,WA 98056 WA Toxics-Washington Toxics/SRC#5911 EPA/Agency ID: N/A Agency Address: STONEWAYCONCRETE 1915 SE MAPLE VALLEY HIGHWAY RENTON,WA 98055 Region: NORTHWEST State Detail Description: NO Contact: NOT REPORTED Description: WASTE.METALS Description: WASTE:PETROLEUM PRODUCT Description: WASTE.NON-HALOGENATED SOLVENTS Description: DATE ECOLOGY RECEIVED REPORT.•6/27/90 Description: MEDIA:SOIL Description: REPORT TYPE.FINAL Description: ISSUE OF SITE REGISTER:90-07 VISTA PUGET SOUND POWER LIGHT RENTON VISTA ID#: 342043 1Map ID Address': Distance/Direction: 0.48 MI/W 620 S GRADY WAY Plotted as: Point RENTON,WA 98055 WA Toxics-Washington Toxics/SRC#5911 EPA/Agency ID: N/A Agency Address: PUGET SOUND ENERGY 620 S. GRADY WAY RENTON,WA 98055 Region: NORTHWEST State Detail Description: NO Contact: NOT REPORTED Description: WASTE:POLYCHLORINATED BIPHENYLS Description: WASTE:POLYNUCLEAR AROMATIC HYDROCARBONS 'VISTA address includes enhanced city and ZIP. For more information call VISTA Information Solutions, Inc. at 1 -800-767 -0403. Report ID: 99330Al11 Date of Report:September 3, 1999 Version 2.6.1 Page 19 SITES IN THE SURROUNDING AREA (within 1/4 -1/2 mile)CONT. Description: DATE ECOLOGY RECEIVED REPORT3122/98 Description: MEDIA:SOIL Description: MEDIA:SEDIMENTS Description: REPORT TYPEJNTERIM Description: ISSUE OF SITE REGISTER:98-06 Description: WASTE.-POLYCHLORINATED BIPHENYLS Description: WASTE:POLYNUCLEAR AROMATIC HYDROCARBONS Description: DATE ECOLOGY RECEIVED REPORTA130/98 Description: MEDIA:GROUNDWATER Description: MEDIA:SOIL Description: REPORT TYPEJNTERIM Description: ISSUE OF SITE REGISTER:98-07 SITES IN THE SURROUNDING AREA(within 1/2- 1 mile) .VISTA NORTHWEST PIPELINE SEATTLE VISTA ID#: 2883006 Map ID Address': 800 S 21 ST ST Distance/Direction: 0.87 MI/SW RENTON, WA 98055 Plotted as: Point SPL-State Equivalent Priority List/SRC#5429 Agency ID: 2392 WARM 3 Agency Address: SAMEASABOVE Status: UNKNOWN Facility Type: NOTAVAILABLE Lead Agency: NOTAVAILABLE State Status: NOTAVAILABLE Pollutant 1• EPA PRIORITY POLLUTANTS-METALS CYANIDE Pollutant 2: PESTICIDE Pollutant 3: UNKNOWN im VISTA address includes enhanced city and ZIP. For more information call VISTA Information Solutions, Inc. at 1 -800-767 -0403. Report ID: 99330Al11 Date of Report:September 3, 1999 Version Z6.1 Page 110 SITES IN THE SURROUNDING AREA(within 1/2 - 1 mile) CONT. VISTA PACIFIC CAR FOUNDRY CO VISTA ID#: 4864595 Map lD � Address': Distance 0.99 MI 1400 N 4TH ST RENTON WA 98055 Plotted as: Polygon 4 NPL - National Priority List/SRC#5900 EPA ID: WAD009249210 Agency Address: PACIFIC CAR FOUNDRY CO. 1400 N 4TH ST RENTON,WA 98055 EPA Region: 0 Congressional District: 0 Federal Facility: Agency Code() Facility Ownership: NOT AVAILABLE Site Incident Category: unknown Federal Facility Docket: Agency Code() NPL Status: UNKNOWN Incident Type: Unknown Troposed NPL Update#: 0 `Final NPL Update#: 0 Financial Management System ID: NOT REPORTED Latitude: 0 Longitude: 0 Lat/Long Source: Agency code() Lat/Long Accuracy: Unknown Dioxin Tier: Unknown USGS Hydro Unit: 0 RCRA Indicator: Unknown Alias Name: PACCAR -Alias Street: NOT REPORTED Alias City: NOT REPORTED Alias Latitude: 0 Alias Zip: NOT REPORTED Alias Longitude: 0 Alias State: NOT REPORTED Alias Name: PACIFIC CAR FOUNDRY CO Alias Street: NOT REPORTED Alias City: KING Alias Latitude: 4729200 Alias Zip: NOT REPORTED Alias Longitude: 12211470 IAlias State: NOT REPORTED VISTA address includes enhanced city and ZIP. For more information call VISTA Information Solutions, Inc. at 1 -800-767 -0403. Report ID: 99330Al11 Date of Report:September 3, 1999 Version 2.6.1 Page/11 UNMAPPED SITES No Records Found i =-w VO-"'0- VISTA address includes enhanced city and ZIP. For more information call VISTA Information Solutions, Inc. at 1 -800 -767 -0403. Report ID: 9933OAl11 Date of Report: September 3, 1999 Version 2.6.1 Page 172 SITE ASSESSMENT REPORT DESCRIPTION OF DATABASES SEARCHED A) DATABASES SEARCHED TO 1 MILE i NPL VISTA conducts a database search to identify all sites within 1 mile of your property. SRC#: 5900 The agency release date for NPL was May, 1999. The National Priorities List(NPL) is the EPA's database of uncontrolled or abandoned hazardous waste sites identified for priority remedial actions under the Superfund program. A site must meet or surpass a predetermined hazard ranking system score, be chosen as a state's top priority site, or meet three specific criteria setjointly by the US Dept of Health and Human Services and the US EPA in order to become an NPL site. SPL VISTA conducts a database search to identify all sites within 1 mile of your property. SRC#:5429 The agency release date for Confirmed Contaminated Sites Report was November, 1998. The Washington Confirmed Contaminated Sites Report contains a WARM (Washington Ranking Model) BIN Number of 0-5 which is assigned to an NPL site designating it as a State Priority Site. CORRACTS VISTA conducts a database search to identify all sites within 1 mile of your property. SRC#:5896 The agency release date for HWDMS/RCRIS was May, 1999. The EPA maintains this database of RCRA facilities which are undergoing "corrective action".A"corrective action order" is issued pursuant to RCRA Section 3008 (h) when there has been a release of hazardous waste or constituents into the environment from a RCRA facility. Corrective actions may be required beyond the facility's boundary and can be required regardless of when the release occurred, even if it predates RCRA. B) DATABASES SEARCHED TO 1/2 MILE CERCLIS VISTA conducts a database search to identify all sites within 1/2 mile of your property. SRC#: 5790 The agency release date for CERCLIS was March, 1999. The CERCLIS List contains sites which are either proposed to or on the National Priorities List(NPL) and sites which are in the screening and assessment phase for possible inclusion on the NPL.The information on each site includes a history of all pre-remedial, remedial, removal and community relations activiies or events at the site, financial funding information for the events, and unrestricted enforcement activities. For more information call VISTA Information Solutions, Inc. at 1 -800-767 -0403. Report ID: 99330Al11 Date of Report: September 3, 1999 Version 2.6.1 Page#73 NFRAP VISTA conducts a database search to identify all sites within 1/2 mile of your property. SRC#: 5791 The agency release date for CERCLIS-NFRAP was March, 1999. NFRAP sites may be sites where, following an initial investigation, no contamination was found, contamination was removed quickly, or the contamination was not serious enough to require Federal Superfund action or NPL consideration. SCL VISTA conducts a database search to identify all sites within 112 mile of your property. SRC#: 5428 The agency release date for Suspected Contaminated Sites Report was November, 1998. The Washington Suspected Contaminated Sites Report is not assigned a WARM (Washington Ranking Model) BIN Number, designating these sites a contaminated site. The Washington Affected Media and Contaminants Report includes sites in the following categories: (1) National Priorities List(NPL) Sites, Federal Lead; (2) National Priorities List(NPL) Sites, State Lead; (3) State Sites, Confirmed Hazardous Substances Sites (sites where the presence of hazardous substances has been confirmed by laboratory or field determinations; (4) Potential Hazardous Substance Sites, these sites have been reported to the Department of Ecology and further investigation including sampling is underway; (5) State Sites Under-going Long-Term Monitoring; and (6) Sites For Which Cleanup is Complete. This report include_ s some leaking underground storage tank sites. RCRA-TSD VISTA conducts a database search to identify all sites within 1/2 mile of your property. SRC#: 5896 The agency release date for HWDMS/RCRIS was May, 1999. The EPA's Resource Conservation and Recovery Act(RCRA) Program identifies and tracks hazardous waste from the point of generation to the point of disposal.The RCRA Facilities database is a compilation by the EPA of facilities which report generation, storage, transportation, treatment or disposal of hazardous waste. RCRA TSDs are facilities which treat, store and/or dispose of hazardous waste. SWLF VISTA conducts a database search to identify all sites within 1/2 mile of your property. SRC#: 5619 The agency release date for Municipal Solid Waste Facilities was September, 1998. This database is provided by the Department of Ecology, Solid Waste Services Program. The agency may be contacted at: 360-407-6133. The Washington Solid Waste Inventory does not provide facility locations. LUST VISTA conducts a database search to identify all sites within 1/2 mile of your property. SRC#: 5910 The agency release date for Leaking Underground Storage Tank List was May, 1999. This database is provided by the Department of Ecology, Toxics Cleanup Program. The agency may be contacted at: 360-4077179 . The Washington Department of Ecology Leaking Underground Storage Tank List contains some of the same sites included on the Regional lists. This list is being used because there are some "new"sites and it includes a site identification number. Because two lists are being used, sites may be reporting twice. For more information call VISTA Information Solutions, Inc. at 1 -800-767 -0403. Report ID: 99330Al 11 Date of Report:September 3, 1999 Version 2.6.1 Page 114 WA Site VISTA conducts a database search to identify all sites within 1/2 mile of your property. Register The agency release date for Toxic Cleanup Program Site Register was May, 1999. SRC#: 5911 This database is provided by the Department of Ecology, Toxics Cleanup Program. The agency may be contacted at: 360-407-7200. The Washington Site Register Toxics Cleanup Program report details activities related to the study and cleanup of hazardous waste sites under the Model Toxics Control Act. Note that the State of Washington cautions that information contained under the Site Description is summarized information from an Independent Report and the Department of Ecology is not responsible for the accuracy of these reports. This report includes some leaking underground storage tank sites. C) DATABASES SEARCHED TO 1/4 MILE UST's VISTA conducts a database search to identify all sites within 1/4 mile of your property. SRC#:5909 The agency release date for Underground Storage Tank Database was May, 1999. This database is provided by the Department of Ecology, Solid Hazardous Waste Program.The agency may be contacted at: 360-407-7179; Caution-Many states do not require registration of heating oil tanks, especially those used for residential purposes. D) DATABASES SEARCHED TO 1/8 MILE ERNS VISTA conducts a database search to identify all sites within 1/8 mile of your property. SRC#:5598 The agency release date for was December, 1998. The Emergency Response Notification System (ERNS) is a national database containing records from October 1986 to the release date above and is used to collect information for reported releases of oil and hazardous substances.The database contains information from spill reports made to federal authorities including the EPA, the US Coast Guard, the National Response Center and the Department of Transportation. The ERNS hotline number is(202) 260-2342. RCRA-LgGen VISTA conducts a database search to identify all sites within 1/8 mile of your property. SRC#:5896 The agency release date for HWDMS/RCRIS was May, 1999. The EPA's Resource Conservation and Recovery Act(RCRA) Program identifies and tracks hazardous waste from the point of generation to the point of disposal. The RCRA Facilities database is a compilation by the EPA of facilities which report generation,storage,transportation, treatment or disposal of hazardous waste. RCRA Large Generators are facilities which generate at least 1000 kg./month of non-acutely hazardous waste (or 1 kg./month of acutely hazardous waste). RCRA-SmGen VISTA conducts a database search to identify all sites within 1/8 mile of your property. SRC#:5896 The agency release date for HWDMS/RCRIS was May, 1999. The EPA's Resource Conservation and Recovery Act(RCRA) Program identifies and tracks hazardous waste from the point of generation to the point of disposal. The RCRA Facilities database is a compilation by the EPA of facilities which report generation, storage, transportation, treatment or disposal of hazardous waste. RCRA Small and Very Small generators are facilities which generate less than 1000 kq./month of non-acutely hazardous waste. V.0�� For more information call VISTA Information Solutions, Inc. at 1 -800-767 -0403. Report ID: 99330Al11 Date of Report: September 3, 1999 Version 2.6.1 Page,#15 End of Report For more information call VISTA Information Solutions, Inc. at 1 -800-767 -0403. Report ID: 99330Al11 Date of Report:September 3, 1999 Version 2.6.1 Page#16 6.5 ABANDONED MINE ASSESSMENT BY HART CROWSER DATED AUGUST 23, 1999 ArIF XN �CR0WS� Hart Crawler,last 1910 FairviewAvenue East Seattle,Washington 98102-3699 Fax 206.328.5581 Earth and Environmental Technologies Tel J-7179 August 23, 1999 Mr. Ryan Fike, Project Administrator Bennett Corporation 9 Lake Bellevue Drive, Suite 204 Bellevue, WA. 98005 Re: Abandoned Mine Assessment Heritage Arnold Property Renton, Washington Dear Mr. Fike: This letter report presents Hart Crowser's assessment of abandoned underground coal mines related to prospective development of the Heritage Arnold property in Renton. We understand that you are considering potential residential development of approximately 10.4 acres located near South 7th Avenue and Jones Avenue South, in the NW 1/4 of the NW 1/4 of Section 20, T 23 N, R 5 E. The purpose of Hart Crowser's work was to assess potential development constraints, if any, related to abandoned underground coal mine workings at the site based on available information, and provide geotechnical recommendations. Hart Crowser's scope did not include completion of any subsurface borings or tests at the site. Prior to beginning work, Hart Crowser informally contacted the City of Renton Planning Department to inquire about general requirements for developing areas which may be affected by abandoned underground mines. We were advised that the City does not have specific requirements related to development proposals involving abandoned mine lands, but would expect that area to be addressed through a geotechnical engineering report. Seattle.Tacoma•Richland•Anchorage•Portland•Denver•Honolulu•San Francisco•Long Beach•San Diego•Mexico City Bennett Corporation J-7179 August 23, 1999 Page 2 This report is divided into the following sections: ► SUMMARY; ► AVAILABLE MINE INFORMATION; ► REPORTED MINE-RELATED HAZARDS; ► EVALUATION OF POTENTIAL FUTURE SUBSIDENCE; ► 'GENERAL RECOMMENDATIONS FOR SITE DEVELOPMENT; and ► USE OF THIS REPORT. Figures are included following the main text of this report. Figure 1 shows location of the site. Figure 2 shows a site plan with the principal mine tunnels. Figure 3 presents a diagrammatic cross section of the mine workings. SUMMARY The property is underlain by three coal seams with reported mine workings located in the upper (No. 1) coal seam and lowest (No. 3) coal seam. Elsewhere in Renton, the intermediate (No. 2) coal seam has also been mined, but apparently not in close proximity to the Heritage Arnold property. Depth of the No. 1 Seam mine workings varies from about 250 to 300 feet in the western part of property, while the No. 3 Seam workings range between about 475 to 765 feet in depth and extend across the entire property. Mining in Renton occurred over a period ranging from around 1875 to 1955. Hart Crowser did not find any indication of mining on or immediately adjacent to the Heritage Arnold property after the early 1920s. Typically mine subsidence occurs relatively soon after mining, as discussed in this report. The US Department of Interior, Office of Surface Mining(OSM) has recorded less than about a dozen incidents of mine subsidence and other hazards related to the abandoned mines in Renton since 1982, most of which involve relatively shallow workings, and none of which involve the Heritage Arnold property. Available information on subsurface conditions at the Heritage Arnold site from mine maps and other sources is very limited, but appears to be reasonably consistent. Hart Crowser is not aware of any deep borings or rock test data for the area. As a result, only general estimates of potential for subsidence and magnitude of surface movements can be accomplished within the limits of available information, as discussed later in this report Comparison with statistical evaluations from other ArW LI Bennett Corporation J-7179 August 23, 1999 Page 3 sites suggests this subsidence has most likely already occurred, and any future ground movements are likely to be a fraction of the calculated values discussed in this report. Hart Crowser considered three potential types of mine hazard that could occur at the site: trough- type settlements which could damage structures, pavements or utilities over a long period of gradual settlement; sinkholes (sudden ground collapse over a local area); and mine gas emissions. Trough-type subsidence could occur at the site, but in our opinion is unlikely to cause ground movements sufficiently large to damage conventionally constructed structures. Statistical evaluation of trough subsidence in other parts of the US has consistently demonstrated that more than 90 percent of subsidence events occur within about 70 to 80 years after mining; the mine workings underlying the Heritage Arnold property are believed to have been completed more than 75 years ago. Empirical analysis of maximum potential trough-type subsidence at the Heritage Arnold property, using worst case assumptions of: 1) no subsidence to date, 2) discontinuous mining, and 3) superposition of subsidence effects from adjacent seams, shows some potential of ground movements in the western part of the site that would require special construction under regulations used by King County and the City of Bellevue. Actual future settlement and ground strain are likely to be considerably less than these threshold values. Potential future development of sinkholes at the site is also not likely to occur, in our opinion. This is because of the time elapsed since mining and because depth of the shallowest workings at the site is more than two-and-a-half times the maximum depth of previous sinkholes reported in western Washington. Mine gas emissions are unlikely to be a problem for structures constructed with vapor barriers and good crawl space ventilation.The only reported occurrence of mine gas problems in the Renton area actually occurs not far from the site, and could be related to workings on the No. 1 Seam which extend onto the Heritage Arnold property. However, the depth of these workings on the site is more than five times the depth where the gas problem occurs, and overall mine gas problems are extremely rare in western Washington. Depth of the mine workings underlying the Heritage Arnold property is generally quite a bit more than other mine workings where problems have occurred within the City of Renton. While it isn't possible to prove there is no chance of future mine-related problems at the site, there is no clear basis for anticipating future mine hazards would arise at this site that are similar to problems which have occurred elsewhere in the City. Bennett Corporation J-7179 August 23, 1999 Page 4 In Hart Crowser's opinion, it is reasonable to develop the Heritage Arnold property using conventional construction,with little risk of future mine-related problems. AVAILABLE MINE INFORMATION Information on abandoned underground mines at the Heritage Arnold site includes the Washington Department of Natural Resources mine map archives, a 1985 Morrison Knudsen investigation for OSM, and Bulletin No. 3, a 1912 report prepared by G. W. Evans for the Washington Geological Survey (see reference list at the end of this report). Three historically mined coal seams underlie the Heritage Arnold site, typically dipping a little south of east at about 10 to 12 degrees below horizontal. The coal beds occur within a series of folded and faulted sandstones, and shales, but there is little or no information on the engineering characteristics of these rocks. Mining in the No. 1 Seam on or immediately adjacent to the property was accomplished by the Denny Renton Clay& Coal Co. from at least 1911 through 1918, and may have began earlier. The mining mostly extended to the west, but was close enough that surface subsidence effects might have occurred on the Heritage Arnold property. The Denny Renton Coal & Clay Co. map designated K30 A shows a somewhat unconventional mining pattern of driving "planes" up dip and mining laterally, with the area adjacent to the Heritage Arnold site apparently completely worked out by 1918. Mining the No. 2 Seam apparently did not extend within the area of potential impacts to the Heritage Arnold site, according to maps in Morrison Knudsen, 1985, as well as review of the Washington DNR mine map index(Schasse et al., 1994). Most of the mining in the No. 3 Seam occurred from about 1874 through about the early 1920s, including the area below the site. The Renton Mine was operated during this period by a variety of operators, most notable the Seattle Electric Company. Typical mining practice in the Renton Mine was to advance principal haulage tunnels (referred to as "levels" or"gangways") laterally from a main haulage slope (inclined shaft) and remove coal by mining on retreat with the breast and pillar system. Bulletin No. 3 indicates that mining had been completed on the 1 st through 7th Levels North by 1912, and was underway on 8th, 9th and 1 Oth Levels North (see Figure 2 for approximate location of tunnels across the Heritage Arnold site). WN as Bennett Corporation J-7179 August 23, 1999 Page 5 It appears that all the No. 3 Seam below the Heritage Arnold property was mined by 1919, the Seattle Electric Co. map no. K31 A shows all the area below the property as being "worked out." This is consistent with the map in Bulletin No. 3 that shows the 9th Level North completed, and the text suggests that 10th Level North was being advanced at the time of the report. By 1920, an 11 th North Level had been driven (see Renton Coal Company, 1920a and 1920b) and a 12th Level North was proposed, which suggests that retreat mining on levels above the 9th Level North (i.e., across the Heritage Arnold property) likely had already been entirely completed. Some mining was accomplished on both the No. 1 and No. 3 seams until the mid-1950s by the Strain Coal Co. (as indicated by Gray, 1955), that probably included mining within workings connected to the mines extending below the Heritage Arnold property. The Strain Co. is one of several local operators that are sometimes referred to as "gypo" miners, typically engaged in salvage mining (pillar robbing) rather than development of new mine reserves.There is no indication that the Strain C-o. or any others mined coal within the area that could influence subsidence at the Heritage Arnold property after the early 1920s; this is significant from the perspective of evaluating risk of future subsidence, as discussed later in this report. REPORTED MINE-RELATED HAZARDS Hart Crowser has worked on abandoned mine problems in Renton and elsewhere in Western Washington since the early 1980s. We understand there are three reports of hazards related to abandoned mine workings on the No. 1 and No. 2 Seams west of the Heritage Arnold site, none on the No. 3 Seam either within or adjacent to the property. For this study, we reviewed other reports of mine hazards in Renton, to see if these involved any conditions similar to those anticipated at the site. Known problems related to abandoned mines in the area include reported subsidence within Renton Ave. north of South 7th Street, collapse of an air shaft at the Noorani residence (706 Renton Ave.), and subsidence and subsequent mine gas emissions at the Thompson residence (1307 South 9th Street). ► No information is available regarding the Renton Avenue subsidence, which was reported by Morrison Knudsen (1985). ► The Noorani subsidence apparently involved collapse of an improperly closed air shaft which extended 165 feet in depth to the Denny Renton Mine workings on the No. 1 Seam. OSM reclosed the shaft in 1982, and no further problems have been reported. irw �r Bennett Corporation J-7179 August 23, 1999 Page 6 ► OSM provided structural repairs to limit subsidence damage to the Thompson residence in 1986 and has been monitoring the presence of carbon dioxide and other gases in the residence since 1997 (Hart Crowser has acted as a consultant to OSM in both of these instances). Other reported mine hazards were found to differ significantly from conditions anticipated at the Heritage Arnold property, e.g., see Morrison Knudsen (1985). Problems at the Thompson residence are potentially the most troubling of the events outlined above and reported elsewhere in Renton, but are not considered particularly likely to occur at the Heritage Arnold property. The Thompson residence is located about 50 feet over the No. 1 Seam and about 130 feet over the No. 2 Seam; considerably less than the depth that these seams occur across the Heritage Arnold Site (about 250 to 300 feet for the No. 1 Seam and about 375 to 605 feet for the No. 2 Seam), see Figure 3. While extent of mining and the source of problems at the Thompson site (i.e., Seam No. 1 or No. 2) are not well understood, there is ample evidence from other sites that the frequency and severity of abandoned mine hazards decreases with depth of the workings. Given the extensive areas of Renton which are underlain by relatively shallow workings and not experiencing problems of the type found at the Thompson site, there is no reason to expect such problems at the Heritage Arnold property. EVALUATION OF POTENTIAL SUBSIDENCE Analyses of maximum potential subsidence and associated ground strain were accomplished for the site using an empirical method which predicts ground movements which might appear as relatively uniform trough-type settlements over a relatively large area(on a scale corresponding to the extent of mining). Potential for sinkhole development(sudden discontinuous ground surface settlement over a relatively limited area on the order of a few feet to a few hundred square feet) was also assessed based on depth and age of the mine workings. Published statistical evaluations of subsidence at other sites, as well as experience with more detailed rock mechanics investigations at other King County sites, suggest that mine subsidence at the Heritage Arnold property has probably already occurred. ► Published reports by others show trough-type subsidence typically occurs within 40 years or so after mining, with 90 percent of subsidence events occurring within 70 to 80 years after mining. Bennett Corporation J-7179 August 23, 1999 Page 7 Published reports by others show sinkhole formation typically occurs within 40 to 60 years or so after mining, with 90 percent of subsidence events occurring within 90 years after mining. Since no borings and rock property tests have been completed at the project location, we used a method of estimating the maximum potentia/settlement and ground strain that could occur, based on the depth, lateral extent, dip, and thickness of the mined-out coal. Information was obtained from maps of mine workings for the No. 1 and No. 3 Seams. Hart Crowser's analysis used an empirical method developed by the British National Coal Board (NCB). Based on similarities in mining techniques used for mines in the British study compared to mining in Western Washington, and studies by others, the approach is believed to be conservative and probably over-predicts magnitude of potential settlements and ground strains.The method is limited in the present application in that it cannot distinguish future ground movement from subsidence which has already occurred. Figure 4 shows a cross section of the subsidence components predicted by the NCB method. A notable aspect of Figure 4 is that the subsidence trough, including particularly the area where tensile ground strains can occur, extends considerably beyond the vertically projected limits of mining, especially on the down dip side. For the Heritage Arnold site, this results in potential ground movements in the western part of the property related to the No. 1 Seam workings which largely extend off-site to the west. Our analysis considered a worst case of superimposing settlements from both seams at once, although there is no reason this would necessarily occur in the real world. Hart Crowser's analysis provided the results discussed below and illustrated on Figure 5 assuming that subsidence affecting the Heritage Arnold site has not already occurred (as noted above, statistical reports from other areas suggests these effects have probably already occurred). Since Renton does not have explicit requirements for threshold ground movements, the following discussion relates to differential subsidence and ground strain values exceeding 0.003, which are accepted as threshold levels requiring special construction by King County and the City of Bellevue. The analysis refers to differential settlement and strain, since structures are usually quite tolerant of high values of total settlement magnitude, but readily damaged by small levels of differential settlement and horizontal strain. am AUF Bennett Corporation J-7179 August 23, 1999 Page 8 As a first case, we estimated ground movements assuming complete mining of both the No. 1 and No. 3 Seams, based on information presented on the maps designated K30 A and K31 A. However, the Morrison Knudsen report indicates that total reported mine production was not as great as implied by complete extraction within the levels worked, and Bulletin No. 3 describes a method of mining in the Renton Mine that is discontinuous. Therefore, as a second approximation, Hart Crowser also calculated ground movements for discontinuous mining of Seam No. 3 (roughly a 50 percent extraction ratio) which would produce greater subsidence impacts. Although predicted levels of total settlement are relatively large, no differential settlement or ground strain values exceeding thresholds values were found for analysis of complete mining of the No. 3 Seam. Since the No. 1 Seam workings are generally located west of the site or along the extreme western edge, and the No. 1 Seam is quite thick, there are differential settlement and ground strain values above threshold values within the Heritage Arnold property for both the cases of complete and discontinuous mining of the No. 1 Seam. ► Maximum trough-type settlements related to the No. 1 Seam could exceed threshold levels (0.003) for ground strain, within an area about 200 feet wide across the middle of the site and in the extreme western corner, see Figures 2 and 5. Subsidence for the No. 3 Seam alone would not exceed the threshold values for ground strain, except in the extreme west corner of the property. ► Maximum differential settlement related to trough-type settlements could exceed threshold values for discontinuous mining of Seam No. 3 in the western part of the site, and for the superimposed effects of discontinuous mining on Seam No. 3 and Seam No. 1,'in the central part of the site. As noted above, actual future differential settlements and ground strains at the site are anticipated to be some fraction of these values, but actual values of future ground movement, if any, cannot be quantified from available information. GENERAL RECOMMENDATIONS FOR SITE DEVELOPMENT The assessment of potential mine hazards accomplished as discussed above did not identify any specific reason not to develop the Heritage Arnold site using relatively conventional construction methods. ALIF Bennett Corporation )-7179 August 23, 1999 Page 9 From our experience studying mine gas problems at the Thompson site, it is apparent that the problems at that site could have been avoided had original construction used conventional vapor barriers and a well-ventilated crawl space. We recommend new construction over abandoned mines typically include such measures. Listed below are general measures reportedly used to mitigate differential subsidence and ground strain problems in areas of trough subsidence. Without knowing details of proposed construction at the Heritage Arnold site, Hart Crowser provides these measures as ideas you may wish to consider and incorporate where feasible in planning construction, particularly within the western part of the site. ► Smaller structures are typically less sensitive to differential settlement compared to large structures: Minimize continuous length of buildings to reduce potential for horizontal strain or differential settlement to produce damaging or aesthetically displeasing cracks or gaps. ► Divide a single large structure into smaller modules, connected by breezeways which can tolerate and/or mask differential movement across the complex as a whole. ► Increase foundation-bearing areas and increase reinforcement in footings to improve stability if non-uniform ground support develops. ► Avoid relatively rigid structural frames and cladding, such as concrete or masonry, in favor of relatively flexible structural elements such as timber or steel. ► Use continuous foundations with post and beam construction to the extent possible. Detail vertical support connections to allow for jacking and shimming if necessary due to long- term settlements. Detail lateral connections to minimize distress and prevent separation of members in the event of racking or translation. ► Select and maintain exterior seals and weather-stripping that can tolerate differential movement of overlapping building elements. ► Select interior floor and wall coverings that maximize tolerance of movement and minimize visual signs of distress (i.e., carpet vs. tile floors, paneling vs. gypsum wall board). Minimize use of large unbroken, exposed surfaces in favor of smaller or"textured" surfaces that will tolerate tilting or differential movement with less apparent signs of distress. Bennett Corporation J-7179 August 23, 1999 Page 10 ► Align gravity flow pipelines and increase slopes to reduce potential for unacceptable flow reduction as settlements occur. ► Plan on regular maintenance to verify performance of weather stripping and integrity of . mechanical or utility systems, where performance may be degraded by building movements. There is some potential that surface evidence of past subsidence and/or abandoned mine shafts may be encountered during site development. We recommend that you contact us in the event this occurs, so that we may assist in hazard assessment and provide recommendations for closure or other mitigation as needed. LIMITATIONS Hart Crowser, Inc. completed this work in general accordance with our proposal dated July 13, 1999. We performed this work for the exclusive use of the Bennett Corporation for specific application to this project and site. Hart Crowser performed this work in general accordance with generally accepted geotechnical engineering practices in the same or similar localities, related to the nature of the work accomplished, at the time the services were performed.We make no other warranty, express or implied. Ar/ �r Bennett Corporation J-7179 August 23, 1999 Page 11 We appreciate the opportunity to assist you with this project. Please call if you have any questions. Sincerely, HART CROWSER, INC. J. - y 1 'P0 � 22484 - NA B�G� SPIRES T-' MICHAEL BAILEY, P.E. Principal Engineer 7179\H eritage(Itr).doc Attachments: References Figure 1 -Vicinity Map Figure 2 -Site Plan with Principal Mine Tunnels Figure 3 -Diagrammatic Mine Workings Cross Section A-A' Figure 4-Subsidence Analysis Components Figure 5 -Calculated Strain and Subsidence Along Profile AA' cc: Geotech Consultants, attn. Mr. Mark McGinnis REFERENCES Denny Renton Clay and Coal Co., 1911. Map of Renton Mine. Map no. K30 A. in Washington DNR mine map collection. Denny Renton Clay and Coal Co., 1918. Map of Renton Mine. Map no. K30 B. in Washington DNR mine map collection. Evans, G. W., 1912. The Coal Fields of King County. Washington Geological Survey, Bulletin No. 3. Gray, Dave, 1955. Map of Renton Mine (Strain Coal Co. workings). Map no. K32 E. in Washington DNR mine map collection. Morrison Knudsen, 1985. Engineering Investigation for the Renton, Washington Area. Report prepared for the Office of Surface Mining, AML Program. National Coal Board, 1975. Subsidence Engineer's Handbook. Renton Coal Co., 1920a. Map of Renton Mine. Map no. K32 A. in Washington DNR mine map collection. Renton Coal Co., 1920b. Map of Renton Mine. Map no. K32 B. in Washington DNR mine map collection. Renton Coal Co., 1932. Map of Renton Mine. Map no. K32 D. in Washington DNR mine map collection. Renton Historical Society, 1982. Copy of mine workings from Evans, G.W., 1920 (Map no. K32 A. in Washington DNR mine map collection) superimposed on a City street map. Schasse, H.W, et al., 1994. The Washington State Coal Mine Map Collection: A Catalog, Index, and User's Guide. Washington Division of Geology& Earth Resources, Open File Report 94-7. Seattle Electric Co., 1919. Map of Renton Mine. Map no. K31 A. in Washington DNR mine map collection. 7179\H eritage(1tr).doc Hart Crowser }7179 7119 VMAP7179 CORE '.d♦ . `� n, � -ri � � � '1p3�11 � � ro ' Y y(�_ r4V'tt.,,.:AY,�_, C AY' ��.h' ` Y / �•�„ , i•�+7 �.� w.C�i �..�5� < N' v. �i. AV t,�.{r"yj .;, It l�'"'"''',,_ �t f ?�p'�'"�Y ` M �?� Jt (4� LIS� $ F�~?ID?8$��!�`,QD �+�`• �i?x�+ � �,�7 i��s�`a-d' 2^Y�y �-�r r� �`¢2 .-1,'`t�'� ,' n �R•$u�k T�' i� s �`ea'� Y V { F mr Y � 8fT EpT 'f�-'`, (/1 C� $ � ;c I �32• \ �' 'S a l� r III T � to � � �` ? ,[S( 4 j ,L��.• 'f'i :�,i• �; 5 '1$ � ` '� �}'�'�a• .�,:� � 1V•.., c�:� A� - ��—`, a :G f K.�a uI I'IS�11 ;. M. 16G00 �+•, 1 - N� AY 5 ,, r T � u� Av" "� rAV j. 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NRpF i• .Y•a Sf 111TH�r 71j, _ � �.Y�""'y � C i;: t.e' : h. co Dv 1ar1,a[ry 11 g �=! a� 'fin ^ tt: � •iS'S y ::• ��"j• a�+.;.. i Site Plan with Principal Mine Tunnels c c� Approximate Area where Calculated Potential Differential Settlement Exceeds 0.003 (see text) o, c .c co 0 s� 0 .� 0 Y y 1 2 _ 4 � ID 1 � y 4 p . s f.{• ' F Sa 4 J t J I pQ 4� _ ' E Approximate Area where Calculated c Potential Ground Strain Exceeds 0.003 Z and Differential Settlement Exceeds 0.003 > i (see text) -� i 0 _ Yz 1 L�AJ Cross Section Location and Designation Scale in Kilometers Location of Reported Workings No. 1 Seam 1":-200' JMrIff o Location of Reported Mine Gangway No.3 Seam xx U —105— Elevation Contours in Meters W. r-B J"71 8/99 Figure Note: Base map prepared from USGS quadrangle re 2 map of Renton,Washington. Subsidence Analysis Components Surface Limits of Subsidence Tensile Strain Zone Compressive Tensile Strain Zone Strain Zone Original Ground Surface Maximum Subsidence I / Differential Subsidence \ I I Up-Dip / Limit Angle Down-Dip `�\ j Angle of Dipping Limit Angle L Coal Seam 00 Mined Portion of Coal Seam Coal Seam Not to Scale A HA R TO W*WA- J-7179 8/99 71791SUBSIDENCE(CDREL) Figure 4 Calculated Strain and Subsidence along Cross Section A-A' Strain along Cross Section -500 -400 -300 -200 -100 0 100 200 300 400 500 0.006 ;q, r r 0.004 , , 0.002 , Strain Profile for Discontinuous Mining Seam No.3 Only 0 r � r °r r �0 -0.002 ' r , r - r - Strain Profile for -0.004 r' Superimposed Effects of / 'r Property CL on Crass Section A-A' r Seam No. 1 and Seam No.3 (Discontinuous) ' , r -0.006 v Subsidence along Cross Section -500 -400 -300 -200 -100 0 100 200 300 400 500 x-- I Property on Cross Section A-A' 0.5 Subsidence Profile for Discontinuous Mining I _ ----- Seam No.3 Only _ --- 1.0 10,-- I ' i O --___0-` 1.5 9�. • 1 Subsidence Profile for b` 2.0 Superimposed Effects of Seam No. 1 and Seam No.3 (Discontinuous) 2.5 A HA J-7179 8199 Figure 5 111916RAPHS (COREL) Diagrammatic Mine Workings Cross Section A-A' ' A 400 R -600 -500 -400 -300 -100 0 100 200 300 400 500 600 If Existing Ground Surface 300 -- 200 Limit of Denny-Renton Mine Plane No. 1 Workings Gangway to No. 1 Plane Denny-Renton Mine(10-Foot-Wide Tunnel) Gangway to No.2 Plane Denny-Renton Mine 10o (10-Foot-Wide Tunnel) Seam No, y i � c 0 m 4th North Gangway w 5th North Gangway Seam No.2 i — 6th North Gangway I �7th North Gangway -200 searh No 3 8th North Gangway I -300 9th North Gangway -4000 --- -� - -- - -- ----- — --- - - ---------- -- -- oReported Mine Workings 0 � 1W 200 I1 .•R0 Unmined Coal Seam Inferred from Mine Map Scale in Feet ��•�• WS ` J-7179 8/99 7179tss-action(csarel) Figure 3 e 5th Gangway Location per Mine Map 9 03'!28I2002 16:44 4257478561 GEOTECH PAGE 02 r r 13256 NortheastStreet,Suite 16 1 pelaevuc,Washington 98005 'ONSUit.TAN'TS, INC. (425)747-5618 FAX(425)74.7-8561 March 28, 2002 JN 99330 Barghausen Consulting Engineers 18215-- 72nd Avenue South Kent, Washington 98032 Attenticn: Robert J_ Armstrong Subject: Response to February 4, 2002 Request for Supplemental Geotechnical Recommendation Heritage Renton Hill Plat Renton, Washington Dear Mr. Armstrong: via facsimile (425) 251-6782 This reply is in response to your February 4, 2002 letter, which requested additional geotechnical information related to the proposed infiltration pond, and potential on-site infiltration of water from roof downspouts, Item I: Based on the provided R2 and R3 drawings, dated February 5, 2002, the rockery along the eastern side of the site will extend between Lots 24 and 32, This rockery will be placed in front of new compacted fill used to raise the lot elevations. Along most of the rockery's length, the fill will slope down toward it at a 2:1 (H:V) inclination, with a moderate slope falling away from the rockery onto the neighboring property. Along the east side of Lot 32, the rockery will be located at least 10 feet from the tap of a steep slope. As noted in our geotechnical engineering report, improvements located within 25 feet of this steep slope are at risk for future damage due to slope movement. The compacted fill placed behind this eastern rockery will need to be reinforced with geogrids. Attached to this letter is a typical,detail for a geogrid-reinforced rockery, including calculations, for submittal to the City of Renton. Please note the stringent fill compaction requirements, and the need to key the rockery and fill into competent, native soils. Construction of the rockery should be closely monitored by the geotechnical engineer. Also, homeowners will need to be notified that excavation within the geogrid-reinforced zone is not allowed, as it could cause failure of the rockery. Item 2: In our November 17, 2000 letter, we recommended using an average test infiltration rate of 0,25 inches/minute (4 minutes/inch). Based on the available subsurface information, and the preliminary pond configuration that you provided, the following correction factors should be applied to the average test rate: • Fte5tlr,g= 0,30 for EPA method. • FgeomL-try: Test pits did not find water or wet soils and TP-G extended to at least 5 feet below the bottom of the pond. 4 x (5 feet/50 feet) + 0.05 =0.45. • FP,u9ging= 1.0 (infiltration pond is preceded by a water quality facility (wetponds)). Therefcre, an Idesign = 0.25 inches/minute x 0.30 x 0.45 x 1.0 = 0.0338 inches/minute or 30 minutes/inch results from applying the correction factors. 03!28/2002 16:44 4257478561 GEOTECH PAGE 03 Barghausen Consulting Engineers JN 99330 March 28, 2002 Page 2 Item 3: Where existing topsoil or silty sand fill remain in the base of the pond when the infiltration pond is fully excavated, the unsuitable soil should be overexcavated to expose the underlying gravelly sands_ This overexcavation should be backfilled with an imported granular soil having a gradation consistent with Backfill for Sand Drains, as defined in 9-03.13 of Standard Specifications for Road, Bridge, and Municipal Construction. A sample of the proposed fill should be submitted to the geotechnical engineer for approval prior to importing the fill to the site. The sand fill should be placed loose into the overexcavation, with no substantial compaction applied. The geotechnical engineer should observe conditions in the base of the pond excavation, and should monitor any necessary overexcavation and replacement of unsuitable soil_ Item 4 The maximum water surface for the infiltration pond is generally at, or below, the grade of the adjacent existing residential lots to the north, and the planned lots within the northwestern portion of the Heritage Renton Hill development. At its closest, the maximum water surface would extend to approximately 15 feet from the adjacent northern lots. In our opinion, the water surface elevation is low enough, and the underlying soils are sufficiently permeable, that the adjacent lots should not be adversely affected by subsurface water originating from the planned infiltration pond. Item 5:The medium sands encountered over much of the project site in our test pits are suitable for infiltration of water from roof downspouts. We anticipate that the methods presented in Section 5.1 of the Surface Water Design Manual (SWDM) will be used to design the individual downspout infiltration systems. The future homeowners should be provided with information regarding the location and maintenance requirements for the infiltration systems. Test Pits 8, 9, and 10, located in the northeastern comer of the site, encountered dense, silty, fine- grained sand that is not suitable for downspout infiltration. Unless these soils can be penetrated to find underlying more permeable sands, downspout infiltration will not be feasible on these lots. Splash blocks or dispersion systems could be used, if the conditions of Section 5.1.2 of the SWDM can be satisfied. For Lots 24 through 32, dispersion may not be acceptable, given the sensitivity of the filled rockeries that will be constructed along the eastern property lines. Dispersion systems for downspouts should be no closer than 25 feet to the eastern filled rockeries or the crest of steep slopes. It will likely be necessary to conduct a lot-by-lot verification of suitable soils for downspout infiltration following site clearing_ GEOTECH CONSULTANTS,INC. 06/28/2002 16: 44 4257478561 GEOTECH PAGE 04 Barghausan Consulting Engineers JN 99330 March 28,2002 Page 3 If you have any questions, or-it we may be of further service, please do not hesitate to contact us. Respectfully submitted, GEOTECH CONSULTANTS, INC. VASI EFIRES25 le>:3 Marc R_ McGinnis, P.E. Principal Attachments: Geogrid-Reinforced Rockery Detail Geogrid Wall Calculations (6 pages) cc: Heritage Arnold Associates LLC —William Sherman via facsimile (425) 885-3939 MRM' esm GEOTECH CONSULTANTS,INC. 03/28/2002 16:44 4257478561 GEOTECH PAGE 05 prevent infiltration 2(Min,) of surface water(See Note 7). r FPrcharge on rockeryh or guardrail (See No 8). 2{I19n.) inimum 12-inches width of 2"-4"quany�,�•� Foundations must °f spalls adJacent to rockery. TA �- . �,�^ bear outside of this Height(H) s ::v ---- -- ?G"eogrid zone Max.-6 feet v �, Compacted a • �_AT 1a inches(max.) A o' � Reinforcement Min.=18" ® '4-inch perforated PVC pipe(slope to drain) .Firm loll -4 L1 No future excavation allowed (see Note 1) General Notes Gene 1. Future excavation in the geogrid-reinforced zone is not permissible,as this may destabilize the Compacted Fill and Rockery. 2. Rookeries shall be constructed by an experienced contractor. 3-man rocks shall be utilized for the lower half of the rockery, with 2-man rocks used for the upper half of the rockery. The lowest row of rocks must bear on firm,native soll at least 13 Inches below the final ground surface. eogrid Reinforcement shall be Tensar BX1200, Miragrid 3XT, or Fortrac 20+,or equivalent,with a maximum separation of 18 inches between geogrid layers_ Substitutions should be submitted to the geotechnical engineer for approval prior to starting construction. Based on a 4-to 6-foot exposed height(H),the Geogrid Reinforcement shall extend behind the rockery a minimum distance of L1 ..4.5 feet. F-or H=3 to 4 feet, L1 should be a minimum of 4 feet, Geogrid Reinforcement is not required for rockery heights(H) of less than 3 fbet. 5. A minimum of 12 inches of quarry spalls shall be placed between the rockery and the Compacted Fill, with a 4-inch diameter perforated drain pipe buried in the spalls at the base of the rockery. 6. Compacted Fill shall be imported granular soil with fines content less than 5 percent. The on-site �� gravelly sand soils are suitable for reuse as Compacted Fill. However,the on-site silty sands or the y�prq existing fill are not acceptable for reuse as the Compacted Fill. A sample of the proposed fill shall be submitted to the geotechnical engineer for approval prior to importing the fill to the site. The fill shall be compacted in a maximum of 9-inch lifts to at least 90 percent of the maximum dry density as determined by Modified Proctor(ASTM D-1557). 7. Surface water must be prevented for infiltrating into the Compacted Fill.The ground surface must be q: sloped so that no standing water can develop,as excessive water in the backfill can cause failure of �p� ��'G 27tta5��4 the reinforced fill. During wet weather,the Compacted Fill should be covered with plastic until the 15TE ♦� ground can be sloped for proper drainage. �'9jolyAL �G :00 8. Fences or guardrails installed behind the rockery must not exert lateral surcharges on the rockery, EXPIRES f such as those that result from wind or traffic loading. If this is a consideration,the geotechnial P engineer must be contacted. [ � GEOGRID-REINFORCED ROCKERY GEGTECH Heritage Renton Hill CONSULTANTS,INC. Renton, Washington Job No: Date: Platte k 99330 March 2002 1 i 03/28/'2002 16:44 4257478561 GEOTECH PAGE 06 KEYSTONE RETAINING WALL DESIGN Based on Rankine(modified soil interface)Methodology Beta Vers_, 13 Apr, 1998 + Project: Heritage Renton Hill Date: 3121f02 Proj. No.: JN 99330 By: mrm Design Parameters ` Soil Parameters pof I Reinforced Fill: 30 0 130 Retained Fill: 30 0 130 I Foundation Fill: 30 0 120 3 Reinforce Fill Type: Silts&sands Unit Fill: Crushed Stone, 1 inch minus 42 Factors of Safety 1 2.00 Sliding: 1.50 Overturning: Pullout: 1.50 Uncertainties: 1.50 Bearing: 2.00 Connection Peak: 1.50 Serviceability: 1.00 Reinforcing Parameters: Mirafi XT Geogrids Tult RFcr RFd RFid LTDS FS Tal Ci Cds Miragrid 3XT 2398 1.67 1.10 1.30 1004 1.50 669 0.90 0.95 Analysis:6-foot fill rockery in front of compacted sand Case: Case 1 Unit Type: COMPAC Wall Batter_7.10 deg. Leveling Pad: Crushed Stone Wall Ht: 6.00 ft embedment: 1.00 ft BackSlope Geometry: 26.50 deg. slope, 10.00 ft long Surcharge: LL- 100 psf uniform surcharge DL-0 psf uniform surcharge Offset= 10.00 ft; Load Width= 100.00 ft Results: sliding Overturnin Bearing Shear Bendin Factors of Safety: 1.56 3.41 6.14 9.27 1.51 Calculated Bearing Pressure: 942 psf Eccentricity at base: 0.35 ft Reinforcing: (ft& Ibs/ft) Lamer Hemet Length, I2einf. Tal Tension FS Conn Tcl 1_Spo :3 4.00 4.5 Miragrid 3XT 373 268 2.09 373 2.72 2 2.00 4.5 Miragrid 3XT 395 380 1.56 395 4.47 I 0.67 4.5 Miragrid 3XT 410 307 2.00 410 8.36 Reinforcing Quantities(no waste included): ( Efficiency 48%) Miragrid 3XT: 1.50 sy/ft _ Me'�'� Z78�6 3 2foz 3 -1 - 03/28f2002 16: 44 4257478561 GEOTECH PAGE A page_�_of 40016 — Hand Calculation Date: 21 March 2002 '7't'�Jrj �. Designer: Mrm Project: Heritage Renton Hiff Case: 6-foot fill rockery in front of compacted sand Design Method:Rankine w/Batter(modified soil interface) Soil Parameters: 16 c—OSf ?� Reinforced Fill 30 0 30 Retained Zone 30 0 130 Foundation Soil 30 0 120 Leveling Pad: Crushed Stone Modular Concrete Unit depth In-Place Wt. COMPRC 1.00 ft 120 pcf Geometry Internal Stability (Broken geometry) Height: 6.00 ft Sackslope: Angle: 26.5 deg Height: 4.99 ft Batter: 7.10 deg Surcharge: Dead Load: 0 psf Live Load: 100 psf External Stability (Broken geometry) Height: 7.75 ft Backslope: Angle: 26.50 deg Height: 3.24 ft Batter: 710 deg Surcharge: Dead Load: 0 Live Load: 100 psf Base width: 4.5 Minimum Design Safety Factors sliding = 1.50 overturning= 2.00 bearing= 2.00 pullout= 1.50 shear= 1.50 bending= 1.50 uncertainties W 1.50 connection 1.50 Earth Pressures: in asnl(a--S 1+ Pa Internal- External R �= 30 deg 0= 30 deg a a= 97.10 deg a^ 97.10 deg A= 26.50 deg R= 26.50 deg 5= 0.00 deg S= 22.56 deg H = 6.00 ft Hn = 7.75 ft ka=0.457 ka=0.381 Hinge Height: 2 CG N9—M= (batter) Hinge Hinge Ht= 8 ft -2- 03/28/2002 16: 44 4257478561 GEOTECH PAGE 83 page 3 of 6 slow — Reinforcing Parameters: Mirafi XT Geogrids Tuit RFcr RN RFid LTDS FS Tal Ci Cds Miragrd 3XT 2398 1.67 1.10 1.30 1004.00 1.50 669 0.90 0.95 Connection Parameters: Mirafi XT Geogrids Frictional Break Pt Rupture Miragrid 3XT Tcl=N tan(8.00) +526 2997 Tcf=N tan(8.00) + 526 Unit Shear Data Base Shear Inter-Unit Shear Shear=N tan(42-80) +0.00 Shear=N tan(27.00) + 770.00 Calculation: Calculated Reactions For the "modffi'�ed"design method, the back of the mass assumed to be vertical for calculation of resisting forces. effective sliding length =4.12 ft Earth Pressure Equations Pa=112rH'k -2c k, .�q=qB k= 4� Pa h= PaCOq-5) Pq_h-Pr�co0(6) ql pa_v= Pa sin(6) Pq_h=Pgcos(,6) Reactions are: P Area Force Arm-x Arm-y Moment H. p� W1 719 (0.87] 3.00 630 ° W2 2136 j2-74] 3-00 5863 Hie W3 181 (3.33] 8.52 604 t2aft_ length 111- Pa_h 1325 5.59 [3.78] -3337 Pa v 551 (5.59 3.78 3077 Sum V= 3587 Sum Mr= 10171 Sum H= 1325 Sum My= -3337 Calculate Sliding at Base For Sliding, Vertical Force=W1+W2+W3+W4+qd = 3587 The resisting force within the rein- mass, Rf 1 = N tan(30)+4.12 x 0.00 =2071 The resisting force at the foundation, Rf 2= N tan(30)+4.12 x 0.00 =2071 The driving forces, Df, are the sum of the external earth pressures: Pa+ Pql + Pqd= 1325 the Factor of Safety for Sliding is Rf 2/Df= 1.56 -3- 03/28/2002 16:44 4257478561 GEOTECH PAGE A9 page of Calculate Overturning: Overturning moment: Mo= Sum Mo Mo= 3540 Resisting moment: Mr=Sum Mr Mr= 12070 Factor of Safety of Overturning= Mr/Mo=3.41 Calculate eccentricity at base: Sum Moments=8529 Sum Vertical =3970 Base Length=4.50 e= 0.10 Calculate Ultimate Bearing teased on shear: where: Nq= 18.40 Nc= 30.14 Ng^ 15.67 Quit=6245 psf Equivalent footing width, B= L-2e= 4.30 Bearing pressure=sumVIB=925 psf Factor of Safety for bearing= Qult/bearing=6.75 Calculate Tensions in Reinforcing- The tensions in the reinforcing layer, and the assumed load at the connection, is the vertical distance supported by each respective layer, Sv. W5&W6 are the dead weights of soi I above the mass within the failure plane,for a sloping backfill (modelled as dead load). Table of Results L11 l21 � M L51 19 L71 U L] 10 L1�1 L?l Layer Depth zi h1 g"h1 (W5+1N6) ( l+gd) cal co r ka P cos(d)-6 Svj ft Ti Tcl f? 0.00 0 0 0 0 0.458 0 3.00 268 373 3 2.00 3.00 390 0 0 0 0.458 179 2 4.00 1.67 380 395 4.67 606 0 0 0 0.458 278 1.00 307 410 1 5.33 5.67 736 0 0 0 0.457 337 -4- 03/28/2002 16:44 4257478561 GEOTECH PAGE 10 page S of Calculate sliding on the reinforcing Due to the descrete layers.the failure plane is assumed to come inside of the mass, reducing the effective sliding length. The angle used for reduction of sliding length is 60 deg The shear value is the lessor of base shear or inter-unit shear. [�] LZ] [3] 141 151 161 121 RF ka Pa [101 [ Pas DF [FS Laver Depth zi Li N Cds ti 6.25 3 2A0 1,00 43 0.95 623 916 0.432 104 0 104 06 2 5.33.33 3 3,35 1 3 2206 0.95 623 2306 0.400 075 0 1075 1,71 Calculate pullout of each layer In the Coulomb, AASHTO, and Rankine methods, the layer- The f pullout is calculated as the individual layer pullout(Rf) divided by the tension (Df) angle of the failure plane is- 60.00 degrees I�] [2] [8] [4] (5] [6) t7] [8] Laver De h zi Le SumV Gi POi Ti FS P4 3 2.00 1.69 416 0.90 729 266 2.72 2 4.00 2.59 630 0.90 1698 380 4.47 1 5.33 3.20 773 0.90 2568 307 8.36 Check Shear&Bending at each layer Bending on the top layer the FoS of Overturning of the units_ (Most surharge loads need to be moved back from the face.) [1] [2] [3] [4] [5] 16I [� [$] [9] [1 0] epth zi Si DF DM Pv RM FS b Shear FS Sh 2.00 2.00 919 24 0 37 1.51 1171 9.64 3 2 .00 .00 119 14 400 144 10.06 1571 10.81 1 5.33 0.67 198 20 559 197 9.99 1839 9.27 -5- 03/2e/2002 16: 44 4257478561 GEOTECH PAGE 11 KEYSTONE RETAINING WALL DESIGN Based on Rankine(modified soil interface) Methodology Beta Vers., 13 Apr, 1998 f Project: Heritage Renton Hill Date: 3/21102 Proj_ No.: JN 99330 By: mrm Design Parameters i Soil Parameters S-PSf ti qcf Reinforced Fill: 30 0 130 -- -J Retained Fill: 30 0 130 Foundation Fill: 30 0 120 3 Reinforce Fill Type: Silts&sands � � Unit Fill: Crushed Stone, 1 inch minus 2 Factors of Safety 1 Sliding: 1.50 Overturning- 2.00 Pullout_ 1.50 Uncertainties: 1.50 Bearing: 2.00 Connection Peak: 1.50 Serviceability: 1.00 Reinforcing Parameters: Huesker Geogrids Tult RFcr RFd RFid LTDS FS Tal Ci Cds Fortrac;20+ 1499 1.67 1.12 1.05 762 1.50 509 0.90 0.95 Analysis: 6-foot fill rockery in front of compacted sand Case: Case 1 Unit Type: COMPAC Wall Satter: 7.10 deg_ Leveling Pad: Crushed Stone Wall Ht- 6.00 ft embedment: 1.00 ft BackSlope Geometry: 26.50 deg. slope, 10.00 ft tang Surcharge: LL- 100 psf uniform surcharge DL-0 psf uniform surcharge Offset= 10.00 ft; Load Width-- 100.00 ft Results: slidin Overturning Bearing Shear Bending Factors of Safety_ 1.56 3.41 6.14 9.27 1.51 Calculated Bearing pressure: 942 psf Eccentricity at base. 0.35 ft Reinforcing: (ft & Ibs/ft) Layer Height Length Reinf. Tai Tension FS Conn Tcl FSpo 3 4.00 4.5 Fortran-20+ 250 268 1.40<< 250 2.72 2 2.00 4.5 Fortrac-20+ 366 380 1.44<< 366 4.47 1 0.67 4.5 Fortrac-20+ 443 307 2.17 443 8.36 Reinforcing Quantities(no waste included): (Efficiency-- 63%) Fortraa20+- 1.50 sy/ft � 1 7.0 OTHER PERMITS Several specialized permits/approvals will be required for this project. Below is a list of the anticipated permits this office will seek as part of this development: 7.1 City of Renton Street Name and Address Approval 7.2 City of Renton Postmaster Approval 7.3 City of Renton Fire Hydrant Location Approval 7.4 Washington State Department of Natural Resources FPA Permit 7.5 Washington State Department of Ecology NPDES Permit Approval 7.6 City of Seattle Water Department Approval to work within Beacon Way S.E. 7.7 Water Line Easement through Falcon Ridge Plat dated March 22,2002 7797.006[RJA/jss/ca] 7.1 CITY OF RENTON STREET NAME AND ADDRESS APPROVAL r..wc: arr: nor arr: nor w U Pw R v..cc: sl.. ,roe r.o `° PPP—SS—TTTT aM CITY OF HORIZONTAL CONTROL PLAN RENTON o z"'a` DATUM x0` Planning/Building/Public Works Dept. NO. REVISION BY DATE APPR """LO'°'"°' 71w NERRACE RAT a. Z � � � C � � � � � � '•Im O f>m D f-t!N 4�. � m V mU#GNP ro0 V PU#4N c� ��All Z k �0 1 Il t • 1 1 # o C m I 1 _ I kk�§ U# WV jn �UU UU�T OrVUA##Sn# I �cr�.cG�� z �a1eas � $ I I uN�s mm c-Vn1 Fn co ;� 2 s g 2 S ' -- --112'..- �FQS 7Nc.a N�� m `• ' 20'JOINTT USE RIVEMY aC` i c. ; M D a ......... ..50' 60-0n N •S E �. z m:� _ elaso 3 -i O Q j> O O_ cz File:P:\SOSKPROJ\7797\engineerin9\7797—h1.On9 01/03/2002 12:16 Scole: 1-50 esi.91W.Xr•1s: z7797—e.0797—tra7797—t, B.C.E. JOB NO. 7797 S'7"IQ'E�'T NKcM�s hd•a �•�•o'x- 1 r i 7.2 CITY OF RENTON POSTMASTER APPROVAL 41- M7-) Q,&4A CIVIL ENGINEERING,LAND PLANNING,SURVEYING,ENVIRONMENTAL SERVICES 0 2 Z� Gar, ENG b� FPY • -1 p � s LETTER OF TRANSMITTAL TO: Bill Sansaver DATE: February 5, 2002 Renton Post Office SENT VIA: Courier Delivery 17200 116th Avenue S.E. OUR JOB: h Renton, WA 98058 0-/ L � ` Heritage Renton Hill 94 Cilqj Quantity Date Descripfion Jl+ �S•� 2 copies Preliminary Plat Sheet 1 of 1 The enclosed plans are for your use in assigning mailbox locations for this project. The project occupies approximately 10.35 acres and is situated east of Beacon Way S.E. and south of S.E. 7th Court in the City of Renton. The project has received preliminary plat approval for 50 lots. Please assign mailbox locations,stamp and sign the plan,and contact me so that I can send a courier to pick up our copy(one copy is for your files). Please call if you have questions. Thank you. 4 Robert J. Armstrong, Barghausen Consulting Engineers, Inc. Signed: i1114tCL9V---)— Don Dawes Project Engineer 18215 72ND AVENUE SOUTH KENT,WA 98032 (425)251-6222 (425)251-8782 FAX www.barghausen.com 7797T.008[DD/ca] a A PORTION OF THE NW 1/4, NE 1/47 SEC. 207 T. 23 N., R. 5 F., W.M. ch \ 4 s d d N / „t:- A t ,fib "F�ic• 1 f 2 3 ` 4 \ 5 \ 6 \ 7 0 50 10D 200 —""— ru 31 y SHEET INDEX- sp 1 OF 1 COVER SHEET U ■ � \ e R1 OF 11 HORIZONTAL CONTROL PUN - _ da u 6 R2 OF 11 ROAD AND DRAINAGE PLAN R3 OF 11 ROAD AND DRAINAGE PROFILE R4 OF 11 ROAD AND DRAINAGE PROFILEr8- = R5 OF 11 TRACT A DRAINAGE POND \`\ RB OF 11 TRACT A DRAINAGE DETAILS 41 a a K .. ./�3� R7 OF 11 ROAD AND DRAINAGE DETAILS R8 OF 11 ROAD AND DRAINAGE DETAILS ' ♦ \ sE 4 1.aYs - 9E ® - R9 OF 11 STREET LIGHT PLAN VICMfTY MAP�N.T.S. x _ RIO OF 11 STREET LIGHTING DETAILS \ �h G Ij,♦ Ms -s. .5„� 24 R11 OF 11 STREET LIGHTING DETAILS \, •`- tdis T, OF 2 GRADING AND EROSION CONTROL PUN n \♦ e �(, ' g26 T2 OF 2 EROSION CONTROL DETAILS W1 OF 4 WATER PUN W2 OF 4 WATER PROFILES W3 OF 4 WATER PROFILES 3° \\ _ W4 OF 4 WATER DETAILS ram,Z o St OF 4 SEWER PLAN r \ is u a it ze S2 OF 4 SANITARY SEWER PROFILES ♦\,`` 0-4W a - \ - S3 OF 4 SANITARY SEWER PROFILES �'l S4 OF 4 SANITARY SEWER DETAILS 22 C n V O a \ RI LEGEND a � EXISTING PROPOSED- UTILITY LEGEND- SYMBOLS LEGEND- PROPOSED STORM DRAINAGE -o l z � PRI POWER A TELEPHONE POLE O- POWER POLE PROPOSED SEWER W/UNDERGROUND —�'— PTL POWER d TELEPHONE POLE E-- GUY ANCHOR ., W/STREET W/GH _ T a UTP UTILITY POLE CELL ANTENNA '— STREET LIGHT I ,♦ \\ PGA GUY ANCHOR M POWER METER ® STREET LIGHT VAULT PROPOSED WATER V'y \ St. STREET LIGHT .a POWER METER PROPOSED ROCKERY SLV STREET LIGHT VAULT r» HYDRANT FH FIRE WM WATER METERo TELEPHONE RISER TOP OF WALL TW N WV WATER VALVEBO WATER BLOW-OFF FIRE HYDRANT BOTTOM OF WALL® Q WAV WATER AIR VALVE GROUND SURFACE ' - SWD SEATTLE WATER DEPT. WATER VALVE ELECTRIC PANEL 23.2 8 CONSTRUCTION SEC7UENCE- GV GAS VALVE ® WATER METER PROPOSED SPOT ELEVATIONS _ GS GAS STUB CABLE T.V.RISER +� i.ATTEND Y OF RENTON.TON MEETING TR TELEPHONE RISER PROPOSED CONTOURS ------100------ WITH CRY OF RENTON. CATV CABLE T.V.RISER Q WATER BLOW-OFF `a 2.FLAG CLEARING LIMITS AS SHOWN ON SHEET Tt TREE LEGEND f,f WATER AIR VALVE PROPOSED ASPHALT a_ 3.CLEAR AND ROUGH GRADE SITE AND AMEND ESC FACILTIES AS F FIR ® SFATTLE WATER DEPT. PROPOSED CONCRETE a_ NEEDED. H CEDAR ELECTRICAL PANELHEMLO S 4.NSTALL UTILITIES PER APPROVED PLANS. M PINE NA © POWER VAULT MAD5.PROVIDE CATCH BASIN PROTECTION FOR ALL NEW/EX. wBs BIRCH WAS MANS 8 oa CATCH BASINS AS SHOWN. CONIFER AS NOTED 12) TELEPHONE MANHOLE F 6.COMPLETE FINAL GRADING AND PAVING. AMEND �'�� 6'-12'MIXED DECIDUOUST CATCH BASIN PROTECTION. R' 0 ID GAS VALVE INDIVIDUAL TREE OR CLUSTER 12'-24'MIXED DECIDUOUS 7.CLEAN NEW STORM DRAINAGE SYSTEM. (D INDIVIDUAL TREE OR CLUSTER GAS STUB —VPN— WATER PAINT MARK S (�B.CONTRACTOR SHALL MAINTAIN 7TSC FACILITIES UNTIL ALL RISK ♦: :.. � i OF EROSION SEDIMENTATION HAS PASSED AND STORM SYSTEM IS 24'R LARGER MIXED DECIDUOUS —PPN— POWER PAINT NARK WINSTALLED AND FUNCTIONAL- SR DO NOT CONVEY SEDIMENTLADEN ! 2 INDIVIDUALL TREE OR CLUSTER —GPN— GAS PAINT MARK La WATER TTR INTO R18LIC STORM SYSTEM. INDIVIDUAL HS ll TPN— TELEPHONE PAINTMARK CONTRACTOR SHALL BE FULLY RESPONSIBLE FOR OBTAINING PERMITS FROM THE WASHINGTON STATE DEPARTMENT OF NATURAL RESOURCES FOR REMOVING AND REPLACING ALL SURVEY MONUMENTATION THAT MAY BE AFFECTED BY CONSTRUCTION o ACTIVITY,PURSUANT TO WAC 332-120. APPLICATIONS MUST BE COMPLETED BY A N REGISTERED LAND SURVEYOR. APPLICATIONS FOR PERMITS TO REMOVE MONUMENTS MAY BE OBTAINED FROM THE WASHINGTON STATE DEPARTMENT OF NATURAL RESOURCES,OR BY CONTACTINGCITY OF RENTON THEIR OFFICE By TELEPHONE AT(206)902-1190. DEYELOPER: WASHINGTON STATE DEPARTMENT OF NATURAL RESOURCES UTR.ITY CONFLICT NOTE- L'�uz E>EPAF3TMENT OF PUBLIC WORKS 1181 WASHINGTON STREET S.E. CAUTION- p AM1 IDEDC LAND SURVEY OFFICE —FORAPPROVAL �,�,,wq ST9 -100HERITA124TH ARNOLDGE ITESt L.L.C. lr�tGH'4(/� P.O.BOX 47060 THE CONTRACTOR SHALL BE RESPONSIBLE FOR VERIFYING THE LOCATION,DIMEFISION,AND DEPTH �F O, n CONTACT.BLLEVUU,WA 98005 N (425) 602-3700 s COVER SHEET o OLYMPIA WASHINGTON 98504-7060 OF ALL EXISTING UTILITIES WHETHER SHOWN ON THESE PLANS OR NOT BY POTHOUNG THE By: Date: UTILITIES AND SURVEYING THE HORIZONTAL AND VERTICAL LOCATION PRIOR TO CONSTRUCTION. !� ! UPON COMPLETION OF SON,ALL MONUMENTS DISPLACED,REMOVED,OR THIS SHALL INCLUDE CALLING UTILITY L LOCATE OF NEW-UTILITY C55 AND THEN POTHOLING Date: n HERITAGE RENTON HILL PUT m 111E ALL OF THE EXISTING UTILITIES AT LOCATIONS OF NEW UTIIIIY CROSSINGS 10 PHYSICALLY By:--Date:— A DESTROYED SHALL BE REPLACED BY A REGISTERED LAND SURVEYOR,AT THE COST AND VERIFY WHETHER OR NOT CONFLICTS EXIST. LOCATIONS OF SAID UTILITIES AS SHOWN ON THESE 26016 � o o oEswNEO BHE K AT THE DIRECTION OF THE CONTRACTOR,PURSUANT TO THESE REGULATIONS. THE PLANS ARE BASED UPON THE UNVERIFIED PUBLIC INFORMATION AND ARE SUBJECT TO VARIATION. �"fs9fv/STERE���4� BARGHAUSEN CONSULTING ENGINEERS yrp I SHE DATE 11Z30/01 NO 7 APPROPRIATE FORMS FOR REPLACEMENT OF SAID MONUMENTADON SHALL ALSO BE THE IF CONFLICTS SHOULD OCCUR THE CONTRACTOR SHALL CONSULT BARGHAUSEN By: Date SAOWgI E�� 18215 72nd AVENUE SOUTH GY o RESPONSIBILITY OF THE CONTRACTOR. CONSULTING ENGINEERS, INC.TO RESOLVE ALL PROBLEMS PRIOR TO PROCEEDING WITH KENT,WA 98032 riy 00 � &LA acme 1-,00' FELD FIOoK PAGE_, U.I Z CONSTRUCTION. G ENGIN By: Date EXPIRES 2 5 02 (425)251-6222 m 7.3 CITY OF RENTON FIRE HYDRANT LOCATION APPROVAL 7.4 WASHINGTON STATE DEPARTMENT OF NATURAL RESOURCES FPA PERMIT 7.5 WASHINGTON STATE DEPARTMENT OF ECOLOGY NPDES PERMIT APPROVAL 1 7.6 CITY OF SEATTLE WATER DEPARTMENT APPROVAL TO WORK WITHIN BEACON WAY S.E. 2-27-02 ; 2:39PM;SPU REAL PROP SVCS ;206 615 121E 7 FILE cop FAX J�1 City of Seattle Greg Nickels,Mayor Y Real Estate Services Seattle Public Utilities Chuck Clarke,Acting Managing Director DATE -�"�--0�, NUMBER OF PAGES (Including cover) T ��� FROM: bVR A B)U-1 ---------------- PHONE42 ZS/gpZZZ PHONE 206 FAX �F FAX# 206-6 - 21 5 ��P� REMARKS : URGENT FOR YOUR REVIEW REPLY ASAP PLEASE COMMENT 27-0-- ; 2:39PM;SPU REAL PROP SVCS ;206 695 t2t�. City y of Seattle Greg Nickel s,]s, Mayor Seattle Public Utilities Chuck Clarke, Acting Managing Director January 23, 2002 Gregg Zimmerman Administrator Planning/Building/Public Works Renton City Hall, Fifth Floor 1055 South Grady Way Renton Washington 98055 RE: Response to the October 12, 2001 letter received from Mr. Gregg Zimmerman, City of Renton - regarding the Temporary Use of CRPL R/W from Puget Dr. SE to Phillip Arnold Park for Construction Traffic Dear Mr. Zimmerman, Seattle Public Utilities (SPU) understands and sympathizes with the City and citizens of Renton in the Renton Hill Neighborhood in trying to solve this access problem. Hopefully something can be worked out to the satisfaction of all parties. To assist you in resolving this SPU will allow the use of its right of way for construction traffic, subject to the following terms and conditions: Executed Permits The Seattle Public Utilities Permit#337- 701 for the use of SPU's right of way needs to be executed. (Copy attached) This permit has been slightly modified from the version that was submitted to the City of Renton on or about September 1st, 2001. The purpose of Permit #337- 701 is separate from the Temporary Use Permit that SPU will issue for the use of the right of way for construction traffic. Reimbursement of SPU Costs SPU will not charge the City of Renton for Permit#337-701, it will be issued for"mutual and off-setting benefits". Our normal $500.00 will be charged for the preparation of the Temporary Use Permit. In addition, SPU will need to be reimbursed for those expenses that it will incur due to construction, traffic and other activities that take place under the Temporary Use Permit. This includes such items as plan reviews, site visits/irispections and meetings. Our process starts with setting up a charge account for work on the Temporary Use Permit. Dexter Horton Building,IV'Floor,710 Second Avenue,Seattle,WA 98104 Tel:(206)684-5851,TTY/TDD:(206)233-7241,Fax:(206)684-4631 An equal employment opportunity,affirmative action employer,Accommodations for people with disabilities provided upon request. 2:39PM;SPU REAL PROP SVCS ;206 615 121S January 17, 2002 Gregg Zimmerman Page 3 of 3 Engineering Requirements for Pipe Protection The City of Renton needs to provide an engineering report to prove via loading calculation/load distribution methods/traffic control/signage, etc, that safety of the pipelines will be maintained and no damage to them will result from the proposed use of the right-of- way. SPU can provide the plan file Ws, assist the engineer that will prepare the report in finding as-built information about the pipelines. SPU will review and comment on proposed protection methods prior to a permit being issued. SPU pipelines are relatively shallow along this portion of the right of way. The construction of the nearby sub station at Puget Drive SE required bridging of the pipelines when transformers were moved onto the site because of the shallow pipeline depth. Risk Management Should a pipeline failure occur, the damages and repair costs could easily be in the millions of dollars. If a small leak develops now, it could cause a pipeline failure months or even years later. For this reason liability coverage will need to extend for a significant period of time after the active use of the right-of-way for construction traffic ends. Seattle's Risk Management Office will be consulted in order to determine the level of risk protection the City of Seattle will require from the City of Renton. The following issues were included in the 11/27/01 E-mail sent by Bob Gambill of SPU to Elizabeth Higgins of the City of Renton. Remarks in italics reflect the current status. 1. As I stated in the attached correspondence, in order to proceed further with this request, SPU needs to be reimbursed for its costs to date($1,564.00),plus an initial deposit of$2,000 needs to be made to charge future costs. (I am still accounting for time spent and that is being added to the $1,564.00) SP U has been reimbursed by Bennett Homes for expenses that were incurred during the Bennett's permitting process. 2. Sufficient protections in the form of a Bond, Insurance and/or an Indemnity Agreement from the City of Renton needs to be in place in order to cover the costs of any restoration needed or damage done to the pipelines,road surface,or vegetation. The specifics will have to be determined by the City of Seattle's Risk Management Office and then included in the Temporary Use Permit. 3. The City of Seattle must have no liability for any accidents or injuries to property or persons that would be caused as a result of any of this activity on the right of way. The specifics will have to be determined by the City of Seattle's Risk Management Office, and then included in the Temporary Use Permit. 4. There must be a contact from the City of Renton that will take the calls from area residents regarding the activities on the right of way. The specifics will need to be included in the Temporary Use Permit. -- '7-02 ; 2:39PM;SPU REAL PROP SVCS ;206 615 i2i5 January 17, 2002 Gregg Zimmerman Page 4 of 3 5. There will probably be a need for a full time traffic director/enforcer, because in order to protect the pipelines,I'm certain that traffic will be restricted to a specific location and speed... and, it is my understanding that the school bus uses the right of way a couple of times a day... how is this going to be coordinated with several hundred trucks coming and going on the right of way? I don't believe that the City of Seattle will be determining or recommending what course of action the City of Renton should take for these issues. I will have to defer to the City of Seattle's Risk Management Office to determine what needs to be done to protect the City of Seattlefrom liability. The specifics will need to be included in the Temporary Use Permit. After the construction associated with the development of the land is complete, there will still be the traffic associated with building the structures and landscaping the lots.., and there will be real estate traffic... moving trucks and other contractors, such as fencing companies, sprinkler systems, decorators... how many of these will Renton want to have use the right of way? The City of Renton needs to make a determination whether the continued use ofSPU's right of way will be necessary for these activities, and then submit a plan for SPU's approval. Bob Gambill will be working on the details. Please feel free to keep in close contact with him on this. He can be reached at 206-684-5969 or emailed at bob.gambill@ci.seattle.wa.us. Very tr I, ours Ron Perkere icr, Manger, Re I Est a Services Cc: Betty Meyer-Water Engineering Division Director Attachments: Seattle Public Utilities Permit#337- 701 27-0- ; 2=39PM;SPU REAL PROP SVCS ;206 61S 121= THE CITY OF SEATTLE-SEATTLE PUBLIC UTILITIES PERMIT and AGREEMENT Permit#337- 701 This Permit and Agreement terminates and replaces SPU Permit*U71-008 THIS AGREEMENT is entered into by and between THE CITY OF SEATTLE, SEATTLE PUBLIC UTILITIES, (hereinafter"City"), and the CITY OF RENTON, (hereinafter"Permittee"): The City does hereby grant, to the extent of its authority, for and in consideration of the mutual and offsetting benefits contained herein, a non-exclusive permit to the Permittee: to use the surface of the City of Seattle's 66' Cedar River Pipeline Right-of-Way (CRPL R/W) in order to provide public access to Phillip Arnold Park, emergency vehicle access to the Falcon Ridge and Renton Heritage Hill developments, and access by school busses across the NE % and the NE / of the SE % of Section 20, Township 23, Range 5 East, W.M., King County, WA. As shown on Exhibits "A" & "B", attached. SUBJECT to City of Seattle ordinances and regulations and to the following terms: SPECIAL TERMS. 1. Permittee will lock the right-of-way gates every evening. 2, The"emergency vehicle"access from the Renton Heritage Hill development shall be gated with a locked gate similar to the existing gate at the Falcon Ridge Development. (a copy of the plans for the gate are to submitted to Seattle Public Utilities (SPU) for review and approval) 3. No construction vehicles shall -be allowed on any portion of SPU's CRPL R/W, including the development of the Renton Heritage Hills Plat, without prior written approval from the City. 4. The City authorizes and the Permittee agrees to provide law enforcement for the right-of-way permit area. 5. The City authorizes and the Permittee agrees to clean-up debris and material dumped or abandoned in the right-of-way permit area. GENERAL TERMS: 1. The City will at all times have unrestricted access to the permit area for the operation, maintenance and repair of its water pipelines. 2. The Permittee's use of the City's right of way shall in no way interfere with the City's present or future use of said right of way for any purpose. 3. The City reserves the right to close the permit area to travel when necessary to its operational needs. 4. The use herein granted is for access road purposes only. This permit does not authorize the installation of drainage or utilities. 5. No walls, rockeries, fences, poles, sidewalks, trees, or changes in grade of the surface of the right of way, shall be installed, constructed or accomplished without permission in writing from Seattle Public Utilities. 6. No vehicles or loads other than those permitted by the City of Renton on any and every street in the City of Renton, shall be permitted on the permit area without written permission from Seattle Public Utilities. 7. The Permittee agrees to maintain the roadway surface in order to keep it in a safe and passable condition at all times, and to take such measures as may be necessary to abate dust from traffic using the roadway. 8. The Permittee agrees that the City shall not be liable for restoration of the road surface, including by reason of any construction, alteration or improvement by the City, its agents or representatives. --��-� 2:39PM;SPu REAL PROP SVCS ;206 61 = 9. The Permittee shall perform no work or make no improvements on the right of way without written permission of Seattle Public Utilities. If work is approved by the City, such work shall be prosecuted with diligence, and with due respect to all property, contracts persons, and the intersts convenience of the public. Permittee agrees to restore the premi es to thec otnd t on found, or better.d 10. The Permittee agrees to maintain compliance with any and all environmental laws and not to cause or permit the property to become contaminated with any hazardous substances in violation of environmental laws. In the event the property becomes contaminated resulting from Permittee's use for the purposes herein granted, Permittee agrees to clean up and remediate damage to property and to bring the property in compliance with the environmental laws. Permittee agrees to indemnify, release and hold harmless the City from any environmental liability which may arise out of, result from, or be related to Permittee's past, present, or future contamination of the property. 11. The annual use fee for this permit shall be $ mutual and off-settin benefits due and payable in advance. This fee may be subject to change in the future. 12. Either party my revoke this permit upon thirty days notice to the other. 13. Payment of application fee: $ 0 . 14. To the fullest extent permitted by law, the Permittee agrees that the City of Seattle shall not be responsible for any injury, loss or damage of any kind or description which may accrue to or be sustained by any person, firm, corporation or other entity by reason of the Permittee's use and occupancy of the property referenced above by the Permittee, its invitees or assigns. In the event any suit or action be brought against the City by reason thereof, the Permittee or its assigns, shall indemnify and save the City harmless therefrom, and shall upon notice to it of the commencement thereof, defend such suit or action at its sole cost and expense and will fully satisfy the final judgment rendered in any such suit or action except for that portion, if any, of such injury, loss or damage that results in such judgment, which is attributable to and proximately results from negligence of the City, its agents, employees or officers. 15. CONTACTS: Seattle Public Utilities Routine operational issues, 425-255-2242. 1055 CRY of Renton Property management issues, 206-684-5969 South Grady Way Renton, In case of emergency, (206) 386-1800. Renton, Washington 98055: APPROVED BY SEATTLE PUBLIC UTILITIES ACCEPTED BY THE CITY OF RENTON Date Date By Ron Perkerewicz By Manager, Real Property Services Signature 710 Second Ave. B 10`h Floor Mailroom y Seattle, WA 98104 Printed or typed Title 4?1J 1' �:� h} � � 1'. ,�+ .-tt�,+'".` '�X��d�A ,`t _ tjhS'�s�, ,':: �? l! �•w; N � �► - yL. � ` jj O Rr l,7 j 1 f . Mi :.co � t - I p. .. ., i ' ,,. .:i t ii yy1 i `� • � �i,1 '� is t �t �: ,`� �''" � ' f �� CL 1 e l 3 . a s3. VC � 4 t it \ry 1 _ f 1 , — ` R. r ..,�. t „ �1+ r fr � � t t• a t '�` `�, � 1. '�: ; I. '� 1 i +>' wVi(. �:�s�' q. ,,�e :. ��r#{ \1;�`'�; �''•�'<R t`1�s'+,.��'� ti �`��"'•� '�t���'r�1i `J •� �� y�� r � 1 I.. 2-27-02.; 2:39PM;SPU REAL PROP SVCS ;206 6t5 t275 I � Ito 3- F �J00 T 1 ' 34 I 47 48 4.0 I �r- �� t - St ,3C2� �S�Pt 2 . �( - - �� �A 12 I A , I .P, ;CITY OF REMMy ,.r. � �c 1 ram. 7.7 WATERLINE EASEMENT THROUGH FALCON RIDGE PLAT DATED MARCH 22, 2002 -117 �y CITY OF RENTON .� Planning/Building/PublieWorks Department Jesse Tanner,2vfayor Gregg Zimmerman P.E.,Administrator March 22,2002 (,Li- G�¢II' AR-i''►.g'T xQ q Cn Mr. William A. Sherman, Jr. ��kP�sKAuS�Jsu +� Sherman Homes 2100— 124th Avenue N.E., Suite 100 Bellevue, WA 98005 Subject: Heritage Renton Hill Plat-Water Line Easement through Falcon Ridge Plat Dear Mr. Sherman: We are glad to notify you that the Falcon Ridge Homeowner's.Association has granted the City a 10-foot wide easement for the proposed water line across the westerly side of the open space tract of the Falcon Ridge plat. The existing water line(590-foot pressure zone)can be extended from the Falcon Ridge plat, through the easement to provide adequate water pressure and flowrate for domestic water service and for fire protection to your development. Ametta Henninger, of our Development Services section,recently completed the plan review comments and will forward the redlined plans to your engineer on Monday,March 25, 2002_ The Water Utility will request a crossing permit from Seattle Public Utilities to install a new 12- inch line across SPU's right-of--way at the north end of the project to increase the fire flow to the Renton Hill area. The City will construct the new crossing at a later date since it does not impact the fire flow to your development. PIease call me at(425)430-7210 if you have any questions. Sincerely, �,00w Abdoul Gafour Water Utility Engineering Supervisor agafour@ci.renton.wa.us ci.renton.wa.us Attachments CC: Kayren Kittrick,Arnetta Henninger—City of Renton Development Services Robert Armstrong--Barghausen Consulting Engineers -- RENTON 90/Ze d tiVZ� K:V SZt7 f Hq,-1 Nn i H=N An 1, I T 1 r-A-)_T 72n7-77-?4HI,I Return Address.- City Clerk's Office City of Renton 1055 South Grady Way Renton, WA 98055 WATER UTILITY EASEMENT Property Tax Parcel Number: Project File#: Street Intersection or Project Name: Reference Number(s)of Documents assigned or released: Additional reference numbers are on page Grantof(s): Grantee(s): I. ��c-cod ?-1 aye N°"�`'�'�'�"s ' �1. City of Renton, a Municipal Corporation 2. The Grantor(s),as named above,for and in consideration of mutual benefits,do by these presents,grant,bargain,sell, convey,and warrant unto the above named Grantee,its successors and assigns,an easement for public water line with necessary appurtenances over,under,through,across and upon the following described property(the right-of-way)in King County,Washington,more particularly described as follows: SEE LEGAL DESCRIPTION ATTACHED AS EXHIBIT"A" Bennet Homc5 Easement,&& Paget FORM 03 0009/bh/ 90iZ0'd TbZL 02V Szb MdHd NOlN3d d0 l,llD BT :1,T 7AA7-77—NHW For the purpose of constructing,reconstructing, installing,repairing,replacing,enlarging,operating and maintaining Water Line utilities and utility pipelines,together with the right of ingress and egress thereto without prior institution of any suit or proceedings of law and without incurring any legal obligation or liability therefor. Following the initial construction of its facilities,Grantee may from time to time construct such additional facilities as it may require. This easement is granted subject to the following terms and conditions: I. The Grantee shall,upon completion of any work within the property covered by the easement,restore the surface of the easement,and any private improvements disturbed or destroyed during execution of the work,as nearly as practicable to the condition they were in immediately before commencement of the work or entry by the Grantee. 2. Grantor shall retain the right to use the surface of the easement as long as such use does not interfere with the easement rights granted to the Grantee. Grantor shall not,however,have the right to: a. Erect or maintain any buildings or structures within the easement;or b. Plant trees,shrubs or vegetation having deep root patterns which may cause damage to or interfere with the utilities to be placed within the easement by the Grantee;or C. Develop,landscape,or beautify the easement area in any way which would unreasonably increase the costs to the Grantee of restoring the easement aria and any private imprwements therein. d- Dig,tunnel or perform other forms of construction activities on the property which would disturb the compaction or unearth Grantee's facilities on the right-of-way,or endanger the lateral support facilities. C. Blast within fifteen(15)feet of the right-of-way. This easement shall run with the land described herein,and shall be binding upon the parties,their heirs, successors in interest and assigns. Grantors covenant that they are the lawful owners of the above properties and that they have a good and lawful right to execute this agreement, By this conveyance,Grantor will warrant and defend the sale hereby made unto the Grantee against all and every person or persons, whomsoever,lawfully claiming or to claim the same. This conveyance shall bind the heirs,executors,administrators and assigns forever. IN WITNES EREOF aid Grantor has caused this instrument to be executed this day of� - rq�.�c�� �ta�C lfomdoc,�,✓�r2s R-+iS'DC. INA/YlDUAL FORM OFACXNOWI,E'DCMENT Notary Seal must be within box STATE OF WASHINGTON )SS COUNTY OF KING ) I certify that I know or have satisfactory evidence that signed this instrument and acknowledged it to be his/her/their free and voluntary act for the uses and purposes mentioned in the instrument Notary Public in and for the State of Washington Notary(Print) My appointment expires: Dated: Bcnnet Homes Eascincnt,do6 Page 2 FORM 03 0009/bh/ 90i�0°d TPZL 02P SEP MdHd NU113d d0 JJ I D AT :LT 7AW!-77,—NHW 1NDIVIDUAL FORM OFACKNOWLEDOMENT Notary Seal must be within box STATE OF WASHINGTON )SS COUNTY OF KING ) I certify that I know or have satisfactory evidence that signed this instrument and acknowledged it to be his/her/their free and voluntary act for the uses and purposes mentioned in the instrument Notary Public in and for the State of Washington Notary(Print) My appointment expires: Dated: REPRESENTATIVE FORM OFACKNOWLEVUXENI' Notary Seal must be within box STATE OF WASHINGTON )SS COUNTY OF KING tlillllll/ rtify that 1 know or have satisfactory evidence that signed this instrument,on oath O � ? t he she hey ere'a tho 'zed to execute the instrument and pOT�gr ache44 ed I as the and of At to be the free and voluntary act of such T part /p es or the u s d purposes mentioned in the instrument. G i L pUE L% �� �r %.'1r� ZOQ %4�*ASVi Pu -ic i an ' for the Sta of Was ngton 11110110 No (Print) My appoinp t expires- 0 Dated: 3 'i5ro Z CORPORATE FORA!OF ACKNOWLEDGMENT Notary Scat must be within box STATE OF WASHINGTON )SS COUNTY OF KING ) On this-- day of , 19 before me personally appeared to me known to be of the corporation that executed the within instrument,and acknowledge the said instrument to be the free and voluntary act and deed of said corporation,for the uses and purposes therein mentioned,and each on oath stated that he/she was authorized to execute said instrument and that the seal affixed is the corporate seal of said corporation. Notary Public in and for the State of Washington Notary(Print) My appointment expires: Dated: H:\DIVISION.S\UTILITII .S\WATER\ABDOUL\PLANRVW\Bennet Homes—Eascmcnt.doc\ Pagc 3 FORM 03 0008ibhl 90itr0'd Z t7ZL alb SD7 Md8d NOlN321 dJD lI I D AT :).1 1 � EXHIBIT"A' LEGAL DESCRIPTION OF EASEMENT A 10-feet strip of land lying within Tract"A"of the plat of Falcon Ridge (also known as Cedar Ridge), as recorded in Volume 129 of plats,pages 51 through 57, inclusive, records of King County, Washington, more particularly described as follows: Beginning at the most westerly corner of said Tract"A"(open space) in said plat; Thence South 44' 19'40" East along the southwesterly boundary line of said Tract"A' and said plat, a distance of 143.41 feet,to the beginning of a curve to the right having a radius of 2,899.65 feet; Thence southeasterly along said curve and said southwesterly boundary line an arc distance;of 61.50 feet,to an intersection with the centerline of SE 8`h Drive; Thence northeasterly along said centerline, to an intersection with a line 10 feet northeasterly of and parallel with said southwesterly boundary line; Thence northwesterly along said parallel line,to an intersection with the westerly boundary line of said plat; Thence South 71° 06' 06" West along said westerly boundary line, to the most westerly corner of Tract"A"and the point of beginning. Situate in the Northeast quarter of Section 20, Township 23 North,Range 5 East,W.M., in the City of Renton, King County, Washington. Containing an approximate area of 2,049 square feet. 91��50 a tibzL aSb SEP mARA wn I wqN -4n A I T'1 T T•)T 7flf17-77_�lw.i � m ID a' m J ia� CE H O BLDO. SEPARAY40N IS MAINTAINED, R LLJ 60 \� a�°Pega 'p.- m 56' zo62 yea 96 v uj • 16 Q o ® iS • . `b� 6 2 SF s NTH sr 76 64 O ��m Q�y,_ �' , • Q\, ® 75 w 65 '�� p 74 NN 70 a g /` o a Q 73 '8, • / o \ to 72 71 a. YRovosm 10-foat wife �� 69\\� uT�i�c�c SASE H�uC fd4. 4 z w Cctti>�Ltu6 O �� �o. A MIN. FIYt-FOOT eL c 3 % I ,a 68 \ pA * -1�Z,.�� mom SIDE u a0• a 7.. Q'e OH LOT T4. SO THAT A O 50 O ti 67 97� V 9L00. SEPMATICN IS ~ • PO,NEP LOT ML LINES I HALL Be PAJYIDFO BETM'F U 66 8 LOT 73, W THAT A TEN-FM q1SO6' SEPWATION IS UAINTAa+Eo. NOTES: L MTHIN THE NATfVE GROWTH PROTECTION EASEMENT AREAS SHOWN ON THIS APPROVED BYTHE NO 6CITY VEGETATION REN70N BWLWNNG DEPARTMENT, DISEASED A KN. FIVE•Ft4f 9LD& SETEXX FROM SIX LOY OR DAMAGED TREES. OR OTHER TREES WHICH FOSE A DANGER TO J '4d LINES 9uLLL BE PRD41DED MYWEEH LOT I* a LJFE CR PROPERTY SHALL BE EXEMPT IMM THIS RESTRICTION. LOT I THAT A Ttm-FOOT BIRO. sOwuT m Is Iu TAWM. 2. THE REMOVAL OF VEGETATION ON THE PRIVATE LOTS SHOWN HEREON SHALL SE. RESTRICTED AS SET FORTH IN THE RECORDED COVENANTS, CONDITIONS AND RESTRICTIONS WHICH HAVE aEEN�FILED OF PUFLJC RECORD. ALL LOT PURCHASERS SHALL REVIEW SAID RESTRICTIONS PRIOR TO ANY YESEPATION REMOVAL, I Y T BARGHAUSEN CONSULTWO EW34NE �LANO PLAN4W, AND DESIGN SKCIA119T ' . SUS &I%0TH Sx 30TE M KRNT.WASHIWTON "M imsi 47L-6P27 8.0 ESC ANALYSIS AND DESIGN 8.0 ESC ANALYSIS AND DESIGN The erosion control plans for Heritage Hill Renton plat were prepared in accordance with the 1998 KCSWDM, Appendix D. The first phase of construction is to remove the garbage fill located in the northwest portion of the site. There is approximately 10,000 cubic yards of fill material. This will be run through an on-site screen and approximately 50 percent will be soil to remain on site and the other 50 percent will be concrete rubble, construction debris, and household garbage hauled off site to an approved dump site location. The next phase of construction will be to clear the trees on the plat. The site will use the permanent wet pond for sediment control. Drainage will be conveyed through V-ditches with rock check dams and 12-inch culverts at roadway crossings. A temporary infiltration pond will be built in the area of Lots 40,41,and 50,where the natural topography is low after the roadway fills are constructed. This will help infiltrate stormwater on site during construction. It is necessary to protect the permanent infiltration pond in Tract A from being contaminated with siltation during construction. The drainage pond plan calls for leaving the pond bottom higher than the permanent bottom elevation through several stages of plat development,finally being excavated to the permanent pond bottom elevation after all of the houses are constructed and the plat is completely stabilized. The plat must prevent silt-laden stormwater from leaving the site. This should not be a problem given the native gravelly sand soils that exist on site. After clearing and removal of stumps and debris,the top soil layer will be stripped and stockpiled on site. The roads and lots will be graded to subgrade elevations, then the topsoil strippings will be spread over the top of the lots approximately 12 inches thick so that the lot pad elevations specified on the construction plans are achieved. Bright orange silt fence will be utilized along the property line for sedimentation control,as well as perimeter protection. 7797.006[RJA/jss/ca] • 0 0