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HomeMy WebLinkAboutcoa.lu.ec.Sunny Park North-Lot 7.1986Sunny Par�j Novf� Lai r1 Scbdr'�isra„ 36 L3�8�f� 8�0 EX c e,o/io n ASPEN/PITKIN PLANNING OFFICE 130 South Galena Street Aspen, Colorado 81611 36 4?y) (303) 925-2020 LAND USE APPLICATION FEES City 00113 - 63721 - 47331 - 52100 GMP/CONCEPTUAL - 63722 - 47332 -52100 GMP/PRELIMINARY - 63723 - 47333 -52100 GMP/FINAL - 63724 - 47341 - 52100 SUB/CONCEPTUAL - 63725 - 47342 - 52100 SUB/PRELIMINARY - 63726 - 47343 -52100 SUB/FINAL - 63727 - 47350 -52100 ALL 2-STEP APPLICATIONS - 63728 - 47360 - 52100 ALL 1-STEP APPLICATIONS REFERRAL FEES: 00125 - 63730 - 47380 - 52100 ENVIRONMENTAL HEALTH 00123 - 63730 - 47380 -52100 HOUSING 00115 - 63730 - 47380 -52100 ENGINEERING SUB -TOTAL County 00113 - 63711 - 47331 -52200 GMP/GENERAL - 63712 - 47332 -52200 GMP/DETAILED - 63713 - 47333 - 52200 GMP/FINAL - 63714 - 47341 52200 SUB/GENERAL - 63715 - 47342 52200 SUB/DETAILED - 63716 - 47343 -52200 SUB/FINAL - 63717 - 47350 -52200 ALL 2-STEP APPLICATIONS - 63718 - 47360 -52200 ALL 1-STEP APPLICATIONS REFERRAL FEES: 00125 - 63730 - 47380 - 52200 ENVIRONMENTAL HEALTH 00123 - 63730 - 47380 - 52200 HOUSING 00113 - 63731 - 09000 -52200 ENVIRONMENTAL COORD. 00113 - 63732 - 09000 - 52200 ENGINEERING SUB -TOTAL PLANNING OFFICE SALES 00113 - 63061 - 09000 -52200 COUNTY CODE - 63063 - 09000 -52200 ALMANAC - 63062 - 09000 - 00000 COMP. PLAN - 63066 - 09000 - 00000 COPY FEES - 63069 - 09000 - OTHER SUB -TOTAL �SS2 / �Gtnen,enf Name: Phone: Address: Project: Check # Additional Billing: TOTAL Date: # of Hours: 10. CASELOAD SUMMARY SHEET ' City of Aspen DATE RECEIVED: o� / 0 1 . DATE RECEIVED COMPLETE: toles=l ts E NO. 36 8 Sy F�) STAFF: S PROJECT NAME: sunaw &t:: N-Qt M �vf % s(,�%C�/yisioh �.YCepfioh APPLICANT: ILbIli /4 sse7` M na o e� �� f 019ci•e Applicant Address/Phone: 61 Q REPRES ENTATIV E: �©fyi /UPG�/IQ�OL Representative Address/Phone: Type of Application: I. GMP/Subdivision/PUD 1. Conceptual Submission 20 $2,730.00 2. Preliminary Plat 12 1,640.00 3. Final Plat 6 820.00 II. Subdivision/PUD 1. Conceptual- Submission - -r4 - - - - $1,900.00 2. Preliminary Plat 9 1,220.00 3. Final Plat 6 820.00 III. All "Two Step" Applications 11 $1, 490 .00 IV. All "One Step" Applications 5 $ 3S0 - a 0 V. Referral Fees - Environmental Health, Housing Office 1 . Minor Applications 2 $ 50.00 2. Major Applications 5 $ 125.00 Referral Fees - Engineering Minor Applications - - 80.00 Major Applications 200.00 P&Z CC\ MEETING DATE: PUBLIC HEARING: YES NO DATE REFERRED: �(!i •• �,/�f�'- INITIALS:�� REFERRALS: City Atty Aspen Consol. S.D. School District �- City Engineer Mtn. Bell Rocky Mtn. Nat. Gas Housing Dir. Parks Dept. State Hwy Dept (Glenwd) Aspen Water Holy Cross Electric State Hwy Dept (Gr.Jtn) City Electric Fire Marshall Bldg: Zoning/Inspectn Envir. Hlth. Fire Chief Other: Roaring Fork Transit. Roaring Fork Energy Center ------------------------------------------ FINAAL ROUTING: 1. DATE ROUTED: ` (IN IT IAL : / / City Atty City Engineer `, Building Dept. Other - Other: FILE STATUS AND LOCATION: C&SE DISPOSITION • „r•yV,,1KA:.-Tj, Lc; ���r�rf(, d ,Lx Reviewed by: A#en P&Z \C Coun- �i j`•. �J'J-i-,^ 0. I io ,',r (.�:.:.-{,l t-; •^ .:i`.L'rl!,/;. [Q, i.•�7a{; 1/.. rfi �{.(,41<-. - /may 1 JJV 7/ 1) A subdivision exception plat shall be submitted conforming to the requirements of Section 20-15 and specifically including information requested by the Engineering Department in the August 17, 1985 memoran- dum. 2) A statement of subdivision exception shall be filed with the City Attorney prior to recordation of plat. 3) The applicant shall submit a specific building envelope proposal as part of the application for the Greenline review, and shall submit information regarding the — impacts of proposed development on the slope vegeta- tion, drainage, and other environmental issues suf- ficient in detail to conduct the 8040 Greenline Review, pursuant to Section 24-6.2. 4) The applicant shall work with the Fire Marshall to determine if a fire hydrant is necessary on the western lot line near the access road, and shall provide a fire hydrant if it is deemed necessary. The matter shall be resolved prior to approval of the 8040 Greenline Review. 5) �The� submitted plat will include language which indi- �-� cattes�that the parcel subtracted from Lot 7 is dedica- f`,; :-�;,. \tech t tie City for public right-of-way. 6) 8040 Greenline Review for Lot 7 will include an additional subsurface investigation made on the site of development to evaluate the risk of subsidence due to underground mining, pursuant to recommendation made by Chen and Associates in "Subsoil Study and Underground Mine Works Review: Proposed Residence Lot 7, Sunny Park North," December 30, 1986. 7) The applicant shall state within the statement of subdivision exception agreement to join any improvement districts created in the future that encompasses this property." S) The submitted Flat shall inrlude a statement that the F-ar=e`. subtra-ted from the lot wil I be dedi�_ated as a right of way for the use and enjoyment of the F'1-ibl ic- and that the a I i-_ant sha I I i-in-=ondit Iona I IY aline'nd a ivoCa I I F'F' 1 y give an option to the i=ity to a-_ceF•t the Farcel as a dedi-_ated street. This agreerent shaI I also be stated in the '=:tatement of _subdivision E:<:,=eFtion. sb..= F• 17 FEB 1 81987 DEDICATION OF RIGHT-OF-WAY FOR ROAD AND UTILITY PURPOSES The 6,900 sq. ft. parcel being subtracted from Lot 7 is hereby dedicated as a public right-of-way for roadway, drainage and utility purposes on, over, along, across, under and through the land described above and on this plat, for the purposes of installing, constructing, replacing, repairing and maintaining a public roadway, drainage facilities and underground utilities, including (but not limited to) water, sewer, electric, gas, telephone and television lines; together with the right to ingress and egress for such installation, construction, replace- ment, repair and maintenance; and owner unequivocally and irrevocably grants and dedications an option to the City to accept the aforesaid parcel as a City right-of-way, to be exercised by written acceptance of the City Council. 0 • MEMORANDUM TO: Aspen City Council THRU: Robert S. Anderson, Jr., City Manager FROM: Steve Burstein, Planning Office RE: Sunny Park North Lot 7 Subdivision Exception DATE: January 21, 1987 ---------------------------------------------------------------- ---------------------------------------------------------------- LOCATION: Lot 7, Sunny Park North Subdivision, east of the Park Circle loop, and up the hillside. ZONING: R-15A (PUD). LAND AREA: 15,191 s.f. APPLICANT'S REQUEST: Pitkin County, owner of the subject proper- ty, requests approval of subdivision exception for the purpose of a lot line adjustment. The parcel would be reconfigured to add 6,900 s.f. to the north of the platted lot, and subtract 6,900 s.f. to the south where Park Circle goes through. Approval given in 1985 expired because a plat was not filed; and the County would like City Council to reconsider and approve the same application. PREVIOUS COUNCIL ACTION: City Council approved the requested lot line adjustment on September 9, 1985. On August 13, 1984, City Council approved annexation of the 6,900 square foot parcel of land situated to the north of lot 7. Council rezoned Lot 7 and the 6,900 square foot parcel to R-15A(PUD) on October 22, 1984. The Board of County Commissioners approved a subdivision exemp- tion on July 8, 1985 to adjust the lot line between the Mollie Gibson parcel and Lot 7. PROBLEM DISCUSSION: A. Referral Comments: 1. Engineering Department: The following comments were submitted in a memorandum by Jim Gibbard on January 21, 1987: A. The submitted plat should include language which indicates that the parcel that has been subtracted from Lot 7 has been dedicated to the city for public right-of-way. • • B. The submitted plat should also include in the Owner's Certificate, language that would indicate it had been acknowledged by a Notary Public. C. The applicant should be aware that pursuant to the criteria for the 8040 Greenline Review, it is recommended that additional subsurface investiga- tion be made on the site of development to evaluate the risk of subsidence due to underground mining. B. Planning Office: In the 1985 review of this proposal, the following issues were discussed: adequacy of access via the Smuggler Mountain Road, water pressure, fire protection, environmental concerns related to steep slopes on the property, and defining a building envelope on the bench in the eastern portion of the property. It was noted that the lot being created meets the minimum lot size of 15,000 s.f. and contains developable site on the bench. The County committed to maintain the estimated 1,075 linear feet of the Smuggler Mountain Road to the access road, all within County property. Concerns with the building location, environmen- tal hazards and services were to be fully addressed in the 8040 Greenline Review. The prior conditions of approval (listed 1-4 in staff's recommended motion) are still applicable in our opinion. It should be noted that Chen and Associates prepared a subsurface study and underground mine works review for Lot 7. Based on this report, the Engineer- ing Department commented that additional subsurface investi- gation is recommended. This study can be accomplished in preparation of the 8040 Greenline Review, as was done for Lot 3 and 5 by the Siegels and Smiths. ADVISORY COMMITTEE VOTE: This application was treated as an expedited review by City Council only; and there is no Planning Commission recommendation. RECOMMENDED MOTION: "Move to approve the requested subdivision exception for Lot 7 of Sunny Park North Subdivision subject to the following conditions: 1) A subdivision exception plat shall be submitted conforming to the requirements of Section 20-15 and specifically including information requested by the Engineering Department in the August 17, 1985 memoran- dum. 2) A statement of subdivision exception shall be filed with the City Attorney prior to recordation of plat. 2 0 • 3) The applicant shall submit a specific building envelope proposal as part of the application for the Greenline review, and shall submit information regarding the impacts of proposed development on the slope vegeta- tion, drainage, and other environmental issues suf- ficient in detail to conduct the 8040 Greenline Review, pursuant to Section 24-6.2. 4) The applicant shall work with the Fire Marshall to determine if a fire hydrant is necessary on the western lot line near the access road, and shall provide a fire hydrant if it is deemed necessary. The matter shall be resolved prior to approval of the 8040 Greenline Review. 5) The submitted plat will include language which indi- cates that the parcel subtracted from Lot 7 is dedica- ted to the City for public right-of-way. 6) 8040 Greenline Review for Lot 7 will include an additional subsurface investigation made on the site of development to evaluate the risk of subsidence due to underground mining, pursuant to recommendation made by Chen and Associates in "Subsoil Study and Underground Mine Works Review: Proposed Residence Lot 7, Sunny Park North," December 30, 1986. 7) The applicant shall state within the statement of subdivision exception agreement to join any improvement districts created in the future that encompasses this property." CITY MANAGER'S RECOMMENDATION: SB.010 • • h. pitkin county 506 east main street aspen, colorado B1611 Public Asset Management Office December 16, 1986 Mr. Steve Burstein, City Planner Aspen/Pitkin Planning Office 130 South Galena Aspen, CO 81611 Dear Steve; This letter is to formally request that the Aspen City Council reconsider, approve and sign a plat to h- recorded for Lot 7 of the Sunny Park `.orth Subdivision. The Sunny Park North Lot 7 Subdivision Exception was previously reviewed and approved by council on September 4, 1985. Because of staff changes and other administrative misconnections, the plat was never formally signed and recorded. According to sub- section 20-14(e) of the Aspen City Code, "Failure on the part of the subdivider to record the final plat within a period of ninety (90) days following approval by the city council shall render the plat invalid." Reconsideration and approval is therefore necessary before the plat can be formally accepted and recorded. Please accept this letter and a check for $350.00 (staff time and referrals) as a request far agenda scheduling of this matter. If you have any further, questions, or care to request further information for the agenda packet, please contact me at 925-6612. SincF�reIy, PUBLIC ASSET MANAGEMENT Tom Newland, Planning engineer cc: Ann Bowman J 0 0 MEMORANDUM TO: Steve Burstein, Planning Office FROM: Jim Gibbard, Engineering Department k DATE: January 21, 1987 RE: Sunny Park North Lot 7 Subdivision Exception The Engineering Department has reviewed the above application and has the following comments: 1. The submitted plat should include language which indicates that the parcel that has been subtracted from lot 7 has been dedicated to the city for public right of way. 2. The submitted plat should also include in the Owner's Certifi- cate, language that would indicate it had been acknowledged by a Notary Public. 3. The applicant should be aware that pursuant to the criteria for the 8040 Greenline review, it is recommended that additional subsurface investigation be made on the site of development to evaluate the risk of subsidence due to underground mining. jg/lot7 cc: Jay Hammond ME MORANDU M TO: City Attorney City Engineer FROM: Steve Burstein, Planning Office RE: Sunny Park North Lot 7 Subdivision Exception DATE: January 2, 1987 Attached for your review and comments is an application submitted by Tom Newland requesting reconsideration and approval for signature and recordation of a plat to Lot 7, Sunny Park North Subdivision. The project received subdivision exception approval by Council on September 4, 1985 but due to misconnections, the plat was never formally signed and recorded. Please review this material and return your referral comments to the Planning Office no later than January 12, 1987 so this office has adequate time to prepare for its presentation before City Council on January 26. Thank you. Chen &AAs ociates Consulting Geotechrncal Engineers r I , 5080 Road 154 'qW Glenwood Springs, CO 81601 303/945-7458 Casper Colorado Springs Denver Fort Collins Rock Springs Salt Lake City San Antonio SUBSOIL STUDY AND UNDERGROUND MINE WORKS REVIEW PROPOSED RESIDENCE LOT 7, SUNNY PARK NORTH, PARK CIRCLE ASPEN, COLORADO IPREPARED FOR: PITKIN COUNTY PLANNING 530 EAST MAIN ASPEN, COLORADO 81611 ATTENTION: MS. ANN BOWMAN JOB NO. 4 442 86 DECEMBER 30, 1986 TABLE OF CONTENTS CONCLUSIONS PURPOSE AND SCOPE OF STUDY PROPOSED CONSTRUCTION SITE CONDITIONS SUBSOIL CONDITIONS REVIEW OF MI14E ,JORKINGS AND SUBSIDENCE POTENTIAL Site Geology Mine Records Review Surface Indications of Mining Activity Potential Impacts of Subsurface Mining FOUNDATION RECOMMENDATIONS FLOOR SLABS SURFACE DRAINAGE LI14ITATIONS REFERENCES FIGURE 1 - LOCATION OF EXPLORATORY BORINGS FIGURE 2 - LOGS OF EXPLORATORY BORINGS FIGURE 3 - LEGEND AND NOTES FIGURE 4 - GRADATION TEST RESULTS FIGURE 5 - GRADATION TEST RESULTS TABLE I - SUMMARY OF LABORATORY TEST RESULTS 1 1 2 3 4 4 5 5 5 6 6 8 9 10 11 11 Chen &Associates � � r CONCLUSIONS The subsoils encountered at the site consist of silty sands and gravels with cobbles and boul- ders. Foundations for the residence should consist of spread footings placed on the natural soils below any existing fill and designed for a maximum soil bearing pressure of 3,000 psf. Available mine record maps show that underground mining r:;ay extend beneath the site and the Mollie Gibson cline #1 shaft may be near the northern lot line. The risk of future ground subsidence due to the underground mine workings may be high. Additional investiga- tions are recommended to better evaluate the risk of subsidence. Other gec,technical design and construction considerations for the proposed resi- dence are presented in the body of this report. PURPOSE AND SCOPE OF STUDY This report presents the results of a subsoil study and underground mine works review for a proposed residence to be located on Lot 7, Sunny Park North, Park Circle, Aspen, Colo- rado. The study was conducted for the purpose of developing fo undation recommendations and included a review of mine records maps. The project site is shown on Fig. 1. The study was conducted in accordance with our Agreement for Professional Engineering Services to Pitkin County Planning, dated December 8, 1986. A field exploration program consisting of exploratory borings and a field reconnaissance was conducted to obtain information on subsurface conditions. Samples obtained during the field explo- Chen &Associates ration were tested in the laboratory to determine classification and engineering characteristics of the on -site soil. The results of the field exploration and laboratory testing were analyzed to develop recommendations for foundation types, depths and allow- able pressures for the proposed building foundation. The results of the field exploration and laboratory testing are presented herein. A review of information on mine workings in the area of ' the site was made to evaluate the potential for mine related subsidence. This report has been prepared to summarize the data obtained during this study and to present our conclusions and recommen- dations based on the proposed construction, the subsurface conditions encountered and the mine workings information re- viewed. Design parameters and a discussion of geotechnical engineering considerations related to construction of the pro- posed residence are included in the report. PROPOSED CONSTRUCTION Specific building plans for the proposed residence had not been developed at the time of our study. We understand the findings of our study will be considered in the sale/purchase of the property in which the County is the seller. We assume the residence will be two stories of wood frame construction that will impose relatively light foundation loadings. We also assume the residence will be located in the flatter part of the lot in the area of the exploratory borings shown on Fig. 1. Cut depths Chen &Associates or to achieve foundation bearing levels are expected to be rela- tively shallow, to a maximum of about 5 feet. If building and grading plans for the residence are signifi- cantly different from those assumed above, we should be notified to reevaluate the recommendations presented in this report. SITE CONDITIONS The subject property consists of a vacant lot near the end of Park Circle as shown on Fig. 1. Park Circle has been connected to Park Avenue and the lot is separated from the road by the Salvation Ditch. The central portion of the lot appears to have been graded relatively flat. The western part of the lot is a steep slope down to Park Avenue. We understand the proposed building site is within the flatter part of the lot. The Smug- gler Mine is located northeast of the property and access onto the lot is from Smuggler Mountain Road. At the time of our field work, the lot was covered with about 1 1/2 feet of snow. Vegetation generally consists of scrub brush, grass and weeds. Two relatively broad surface depressions V"' are located on either side of the general building area. The depressions appear to be a few to several feet deep. We under- stand the depressions are probably related to past mining activities in the area. The Salvation Ditch, which is in a culvert, crosses the toe of the steep slope adjacent to the western part of the lot. Chen &Associates }_ • SUBSOIL CONDITIONS The subsoil conditions in the proposed building area were evaluated by drilling two exploratory borings at the approximate locations shown on Fig. 1. The borings were drilled to a depth sufficient for foundation analysis and were not intended to evaluate mine subsidence potential below the site. Graphic logs of the subsurface profiles encountered are shown on Fig. 2. As indicated by the logs, the subsurface profile encountered is relatively uniform and consists of medium dense to dense silty sands and gravels with cobbles and boulders. Subsoil studies performed in the area and on adjacent lots indicate a similar subsurface profile. The drilling with continuous flight auger was relatively difficult due to the material size and density and practical refusal to augers was experienced at a depth of 15 feet at Hole 1. Free water was not encountered in the borings to the maximum depth drilled, 26 feet, and the soils were generally slightly moist. Samples taken from the borings were returned to our labora- tory for review by the project engineer and testing. The results of moisture content and classification testing performed on the samples are presented in Figs. 4 and 5 and summarized in Table I. The gradation analyses were performed on material smaller than 1 1/2 inches. REVIEW OF MINE WORKINGS AND SUBSIDENCE POTENTIAL The scope of our study included a review of published data on the abandoned mine workings in the project area, a review of Chen & Associates subsidence evaluations for adjacent properties, and a general review of published data on the site geology. Site Geology: The site is located on the northern slope of the Roaring Fork Valley. Regional geologic mapping (Bryant, 1971) indicates the surficial soils on the site are glacial morraine deposits, poorly sorted materials ranging from silt to boulder f� sized. The underlying bedrock geology includes a complexly faulted series of Cambrian to Permian -age sedimentary rocks and Precambrian igneous rocks. Mineralization of the bedrock ►•pith silver, lead and zinc attracted intense mining activity in the project area, mainly intermittently in the years between 1879 and 1935. Some minor mining activity has continued in the general area to the present time. Mine Records Review: Maps of the major mining in the project area indicate the site is in an area of extensive mine develop- ment (Rohlfing, 1943 and Bryant, 1972). Mines in the area followed a steeply, northwestward dipping ore zone and included at least fifteen levels, extending at least a thousand feet deep, with miles of tunnels and hundreds of stopes. Although it is difficult to accurately locate the mine workings with respect to the property, it appears that the site is in the vicinity of the workings of the Mollie Gibson Mine. Most of the mining appears to lie north of the site . Surface Indications of Mining Activity: As shown on Fig. 1, there are two depressions in the ground surface near the site. It is likely that these features are a result of subsurface mining. The depression near the northern lot line has been IChen &Associates identified as the location of the Mollie Gibson #1 shaft (Western f Engineers, Inc., 1986). The depression near the eastern property line may be related to an air shaft or incline portal. Potential Impacts of Subsurface Minim: Based on published data, the potential impacts that the underground mines may have on site development cannot be accurately determined. The underground mining in the area is extensive and mine maps often do not ' accurately portray the extent of mining. The risk for ground ✓ subsidence and damage to structures built on the site may be high. Additional subsurface investigations utilizing deep drill holes are recommended to better evaluate subsidence risks on the i site. Sinkholes often occur abruptly in the area of mine shafts, due to collapse of bridged soil and debris used to backfill the openings. If the site is not developed, the Mollie Gibson shaft may still be a hazard because of this collapse potential. FOUNDATION RECOMMENDATIONS The undisturbed natural soils encountered in the exploratory borings should be suitable to support a spread footing foundation ✓ of a residential structure. Settlement potential of the struc- ture due to foundation loading on the soil is expected to be relatively low. Subsidence potential risks due to underground riiine works are presented in the "Review of Mine Workings and Subsidence Potential" section of this report. The owner should consider the mine related risks in the development plans for the lot. aChen & Associates r -7- The design and construction criteria presented below should be observed for a spread footing foundation system. (1) Footings placed on the undisturbed natural soils should be designed for an allowable soil bearing pressure of 3,000 psf. We expect settlement of foundations designed and constructed as discussed in this section will be less than 1 inch. (2) Spread footings should have a minimum width of 16 inches for continuous footings and 24 inches for isolated pads. (3) Foundation walls acting as retaining structures should be designed to resist a lateral earth pressure corresponding to an equivalent fluid unit weight of at least 40 pcf. The foundation walls should be backfilled with granular soil like the on -site soils and compacted to at least 90 percent of standard Proctor density at a moisture content near opti- mum. The lateral earth pressure assumes a relatively hori- zontal backslope grade and a drained condition. (4) Exterior footings and footings beneath unheated areas should be provided with adequate soil cover above their bearing elevation for frost protection. Placement of foundations at least 42 inches below the exterior grade is typically used in this area. (5) Continuous foundation walls should be reinforced top and bottom to span an unsupported length of at least 10 feet. Greater foundation reinforcement may be required to mitigate mine related subsidence potential but should be based 4 Chen & Associates on the results of additional comprehensive subsurface investigations. (6) Areas of loose, disturbed and topsoil materials encountered within the foundation excavation should be removed and the footing bearing level lowered to adequate natural bearing material. (7) A representative of the soil engineer should observe all footing excavations prior to concrete placement. FLOOR SLABS The natural on -site soils are suitable to support lightly to moderately loaded slab -on -grade construction (neglecting mine subsidence potential). To reduce the effects of some differen- tial movement, floor slabs should be separated from all bearing walls and columns with expansion joints which allow unrestrained vertical movement. Floor slab control joints should be used to reduce damage due to shrinkage cracking. We suggest joints be provided on the order of 15 feet on center. The requirements for slab reinforcement should be established by the designer based on experience and the intended slab use. A thin layer of free -draining gravel may be placed beneath the slabs. This material should consist of minus 2-inch aggre- gate with less than 50 percent passing the No. 4 sieve and less than 12 percent passing the No. 200 sieve. Fill placed beneath floor slabs should be a granular mate- rial. The soil engineer should evaluate the suitability of proposed fill materials. Fill should be placed and compacted to Chen &Associates A -9- at least 95 percent of the ri,aximum standard Proctor density near optimum moisture content. We expect the on -site soils, devoid of vegetation, topsoil and oversized rocks, can be used as fill material. SURFACE DRAINAGE The following drainage precautions should be observed during construction and maintained at all times after the residence has been completed. (1) Excessive wetting or drying of the foundation excavations and underslab areas should be avoided during construction. (2) Exterior backfill should be adjusted to near optimum moisture and compacted to at least 95 percent of the maximum standard Proctor density in pavement areas and to at least 90 percent of the maximum standard Proctor density in landscape areas. (3) The ground surface surrounding the exterior of the building should be sloped to drain away from the foundation in all directions. We recommend a minimum slope of 6 inches in the first 10 feet in unpaved areas and a minimum slope of 3 inches in the first 10 feet in paved areas. (4) Roof downspouts and drains should discharge well beyond the limits of all backfill. (5) Runoff from the building drives and landscape areas should not be directed into the surface depressions at the site. The depressions may be filled or berms may be constructed to prevent surface flow into the features. Chen &Associates • LIMITATIONS -10- • This report has been prepared in accordance with generally accepted soil and foundation engineering practices in this area for use by the client for design purposes. The conclusions and recommendations submitted in this report are based upon the data obtained from the exploratory borings drilled at the locations indicated on the exploratory boring plan, mine working informa- tion as referenced herein, and the proposed type of construc- tion. The nature and extent of subsurface variations across the site may not become evident until excavation is performed. If during construction, fill, soil, rock or water conditions appear to be different from those described herein, this office should be advised at once so reevaluation of the recommendations may be made. We recommend on -site observation of excavations and foundation bearing strata by a representative of the soil engineer. Additional comprehensive subsurface investigations are recommended to better evaluate the risks for ground subsidence due to underground mining. CHEN & ASSOCIATES, INC. B yS / Pr'­�k Steven L. Pawlak, P.E. And By IR &t4 Lz;�z4..� Roy H. Spi e G Eng neering Geologist SLP/RHS/ec Chen & Associates 1 E REFERENCES Bryant, 1971, Geologic Map of the Aspen Quadrangle, Pitkin County, Colorado, USGS Map GQ933• Bryant, 1972, Map Showing Mines, Prospects, and Areas of Significant Silver, Lead, and Zinc Production in the Aspen Quad- rangle, Pitkin County, Colorado, USGS Map 17850. Lincoln DeVore, 1983, Report on the Surface Geology and Mining Activity, Centennial Project, Aspen, Colorado. Rohlfing, 1943, Map of Workings in the Aspen Mining District, Pitkin County, Colorado. Western Engineers, Inc., 1986, Geotechnical and Geophysical Study, Lots 3 and 5, Sunny Park North Subdivision. IChen &Associates PG RC�� SCALE: I"= 5d 'Opp QP G 5 PN'J A-( 1 m F"'f 10 lAel,104� LOT 5 LOT 7 0 ,approximate locations HOLE 2 o surface depressions 30 0 • slopes HOLE I Property CCES ENS Boundaries P PSEM / 44286I CHEN and ASSOCIATES, inc. I LOCATION OF EXPLORATORY BORINGIfig. I 100 95 WE c L' a 85 u 80 75 70 Ilo ie l Elev. _ ()^.w 12112 32/12 lVC=3.0 -200=17 33/12 16/6,8/3 Hole Elev. 20/12 26/12 lVC=7. 8 - 200=20 LL=30 P I = 2 33/12 27/12 IVC=4. 1 -200=14 Note: Explanation of symbols presented on Fig. 3. 100 95 90 80 75 70 44.2801 CHEN and ASSOCIATES. inc. I Logs of Fxl)loratory Borings fig. 2 P"Topsoil; root zone, some organics, disturbed zone. Sand anal Gravel (SM-GM); silty, cobbles and boulders, medium dense to dense, slightly moist, yellowish brown. Drive sample; standard penetration test (SPT), 1 3/8-inch I.D. split spoon sample. 20/12 Drive sample blow count; indicates that 20 blows of a 140-pound hammer falling 30 incites were required to drive the SPT sampler 12 inches. TPractical rig refusal. VOTES: 1. Exploratory borings were drilled on December 10, 1986 with a 4-inch diameter continuous flight power auger. 2. Locations of exploratory borings were measured approximately by taping from features shown on the site plan provided. 3. Elevations of exploratory borings were measured by instrument level and refer to ground surface at Hole 2 as elevation 100' assumed. 4. The exploratory boring locations and elevations should be considered accurate only to the degree implied by the method used. S. The lines between materials shown on the exploratory boring logs represent the approximate boundaries between material types and transitions may be gradual. 6. No free water was encountered in the borings at the time of drilling. Fluctuations in water level may occur with time. 7. Laboraoty Testing Results: WC = 11,iter Content ( o) -200 = Percent passing No. 200 sieve I.I. = Liquid Limit ( o) PI = Plasticity Index (o) 1 4442801 C H E N and ASSOCIATES. inc. I Legend and Notes if �ig. . i U U U � r � r �- 0 v � J yY N � N : n v N V rn rA Y/ qJ pW W ' z �Wza W oaa c . 0v 2 u � M W CO � • W c W f J ` 1" C W 0 � C W C � JJ_ O a: ao p W �- o J Z' 1 m Q W z w N O 0 p La2 N .i _ O ' Q na O N Z G �t �7 J W 9� = W = �_ V O M O V ct �7 I w } J y I Q f C>~C OO c C f O co � J y ^ M z f 0 0 z2u z� r y C� Ln r p N f O J a f I w J O N zY PLA NI AND ZONING COMtjT\IWl0121 .Alri II OOvf��L O CENTENNIAL PROJECT O %%, MOLLIE GIBGON ,. PARK LEGAL DD ESCR� PTUQN ,•SMUGGLER=; -_ Txxx PHRK '•=;' S E A TRACT OF LAND BEING PART OF LOT 7, SUNNY PARK NORTH SUB- DIVISION AND A TRACT CIF LAND SITUATED IN THE SOUTHEAST QUARTER OF SECTION 7, T105, R81FW OF THE GTW PM UNTY, COLORADO, ASPiTKFOLLOWSIN BEING MORE FULLY DESCRIBED AVENl,E J SUNNY PARK NORTH suso. BEGINNING AT THE NORTHEAST CORNER OF SAID LOT 7, SUNNY PARK NORTH SUBDIVISION, r" THENCE S 4-S'21' W 8 53 FEET, u THENCE N 74'05' W )54-58 FEET, Ae v THENCE N 23.00'E 98•46 FEET, ta w nr THENCE S 67'27`17"E I88 ZS FEET, r THENCE 5 L5' 21' W 7J 53 FEET, ASPEN THENCE N42'23'W 1•4..GFEET TO THE POINT OF BEGINNING \ CONTAINING 15,101 SQUARE FEET MORE OR LESS. RIVFR R0.1RIhG f>7RK'--� , �E1k1Ny EY�gN 5 THE PLANNING AND ZONING COMMISSION FOR THE CITY OF ASPEN, COLORADO, DOES HEREBY APPROVE OF TH15 MAP OF SUNNY PARK NORTH BOUNDARY ADJUSTMENT AND ANNEXATION TO BE RECORDED IN THE OFFICE OF THE CLERK AND RECORDER OF PITKIN COUNTY, COLORADO, PURSUANT TO ACTION AT ITS MEETING OF ___, 19811- . PLANNING AND ZONING CHAIRMAN DATE ASI'EN� CITY COUNCIL !�`�I',I'I'C�V�L THIS MAP OF SUNNY PARK NORTH BOUNDARY ADJUSTMENT AND ANNEXATION WAS APPROVED BY THE CITY OF ASPEN, CITY COUNCIL ON THIS DAY OF , 12>e4. SIGNED THIS DAY OF , IDBI,. ATTEST: CITY CLERK MAYOR SU<<VEYOO�: S CE(�TIFIC�I T C 1,JAMES F. RESER HEREBY CERTIFY THAT ON AUGUST 25TH., 13B4 A SURVEY WAS PERFORMED UNDER MY SUPERVISION OF SUNNY PARK NORTH BOUNDARY ADJUSTMENT AND ANNEXATION AS SHOWN HEREON. JAMES F. RESER L S. J1B4, BE ,TIFIC�TE TH15 MAP WAS FILED FOR RECORD IN THE OFFICE OF THE CLERK AND RECORDER OF PITKIN COUNTY, COLORADO AT_O'Cl OCK _.M., THIS DAY OF , 1984, AND 15 RECORDED IN BOOK AT PAGE . RECEPTION N° CLERK AND RECORDER STATE OF COLORADO� S.5 COUNTY OF PITKIN THE FOREGOING OWNER'S CERTIFICATE WAS ACKNOWLEDGED BEFORE ME THIS---__ DAY OF , 1984 , BY MY COMMISSION EXPIRES WITNESS MY HAND AND OFFICIAL SEAL. NOTARY PUBLIC ADDRESS EL aE/NG fIDDEO T ME STATEMENT - �% % A fi'/l/NE.YED THE UNDERSIGNED, A DULY AUTHORIZED REPRESENTATIVE OF A CORPORATE TITLE INSURER REGISTERED TO DO BUSINESS IN PITKIN COUNTY-, COLORADO, DOES h'E r/TY e F f7S/cE/V HEREBY CERTIFY, PURSUANT TO SECTION 20-15 (j) OF THE ASPEN MUNICIPAL CODE, THAT THE PERSONS LISTED AS OWNERS ON T}{IS PLAT DO HOLD FEE SIMPLE TITLE TO ALL LIENS AND ENCUMBRANCES EXCEPT THOSE LISTEDONTHE TITLE INSURANCE COMMITMENTS N-s _ ,EFFECTIVE _ RESPECTIVELY, ISSUED BY TITLE OF ASPEN, INC., ALTHOUGH WE 42 ✓/VEf� BELIEVE THE FACTS STATED ARE TRUE, THIS CERTIFICATE IS NOT TO BE CONS- TRUED AS AN ABSTRACT OF TITLE., NOR AN OPINION OF TITLE, NOR A GUARANTY %1-1'rlN OF TITLE, AND IT IS UNDERSTOOD AND AGREED THAT TITLE OF ASPEN, INC., NEITHER ASSUMES, NOR WILL BE CHARGED WITH ANY FINANCIAL OBLIGATION OR LIABILITY WHATEVER ON ANY STATEMENT CONTAINED HEREIN. �Z/ DD"!✓ d39" TITLE OF ASPEN, INC EXECUTIVE VICE PRESIDENT ADDRESS dTE-- ?RzfIs 9RE cSGOPEcS Ovz/f sDlr. STATE OF CALORADOI S.S. COUNTY OF PITKIN j THE TITLE STATEMENT HEREON WAS ACKNOWLEDGED BEFORE ME THIS DAY OF ,1584-, BY , AS EXECUTIVE VICE PRE510ENT OF TITLE OF ASPEN, INC. MY COMMISSION EXPIRES WITNESS MY HAND AND OFFICIAL SEAL. NOTARY PUBLIC ADDRESS CITY ENGINEER`S APPROVAL I, JAY HAMMOND, CITY ENGINEER FOR THE CITY OF ASPEN, COLORADO, DO HEREBY APPROVE OF THIS MAP OF SUNNY PARK NORTH BOUNDARY ADJUSTMENT AND ANNEX- ATION TO BE RECORDED IN THE OFFICE OF THE CLERK AND RECORDER OF PITKIN COUNTY, COLORADO. JAY HAMMOND CITY ENGINEER DATE--_----- �O�VNCEf':TIMF N I,_ AS THE OWNER OF LOT 7, SUNNY PARK NORTH SUBDIV- ISION RECORDED AS PLAT IN BOOK AT PAGE _OF THE RECORDS OF THE CLERK AND RECORDER OF PITKIN COUNTY, COLORADO, HEREBY PUBLISH THIS MAP OF SUNNY PARK NORTH BOUNDARY ADJUSTMENT AND ANNEXATION. P, REVISIONS ENGR. RECORD DRAWING STATUS NO, DESCRIPTION DATE BY CHKD. MNGR IE MECH. CHK. ISSUED DATE STRUCT. CHK. PRELIMINARY _ ELECT. CHK. CLIENT APPROVAL PIPING CHK. APPROVED FOR CONSTRUCTION INSTR. CHK. REVISED AND APPROVEDn -- - --- - -_- - -- CIVIL CHK. FOR CONSTRUCTION REV. --- --- -- NOT APPROVED FOR CONSTRUCTION UNLESS SIGNED AND DATED. DESTROY ALL PRINTS BEARING EARLIER DATE AND/OR REVISION NUMBER SCHMUESER & ASSOCIATES ENGINEERS & CONSTRUCTORS 1512 GRAND AVENUE, SUITE 210 GLENWOOD SPRINGS, COLORADO 81601 13031 945 - 5468 SUNNY PARK NORTH BOUNDARY ADJUSTMENT 8 ANNEXATION MAP B 55884 1723.851 RM I I " = 50' 1 1 r of 1