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HomeMy WebLinkAbout1913 ALGA RD; F; CB940005; PermitBUILDING PERMIT 01/12/94 15:12 Job Address: 1913 ALGA RD Page 1 of 1 Permit Type: MISCELLANEOUS Parcel No: 215-170-03-16 Valuation: 32,000 Construction Type: NEW Occupancy Group: Description: REPAIR FOUNDATION I F' Suite : Lot#: Reference#: = Project No: A9400006 Permit No: CB940005 Development No: ~ .. .. ,I .~. . . ., .. f- .. . Applied: 01/04/94 Status: ISSUED Apr/Issue: 01/12/94 Entered By: DC Awwl/Ownr : SOIL ENGINEERING CONSTRUCTION 619 741-9170 " 456 N. QUINCE STREET ESCONDIDO, CA 920 *x* Fees Required d & Credits """""""""""" Fees : - - - - - - - - - - - Adjustments: .oo Total Fees: 194.00 298.00 Fee description Ext fee """""""""" - - - - - - - - - - - Miscellaneous Fee # 194.00 Miscellaneous Fee # * MISCELLANEOUS TOT 298.00 492.00 *x* Data PLANCHECK BLDGPERMIT INbP. DATE LEARANCE // CITY OF CARLSBAD 2075 Las Palmas Dr., Carlsbad, CA 92009 (619) 438-1161 P abL7 LlCATlON City of Carlsbad Building DepartlPnt 2075 Las Palms Dr., Carlsbad, U pzwp (619) 438-1161 A . 0 Commercial U New Bulldlng U'lenant Improvement UL/- 5- PLAN CHECK NO. / B - 0 Industrial 0 New Building OTenant Improvement C - OResidential OApartment OCondo OSingle Family Dwelling OAdditiom/Alteration ;f"l& 0 Duplex 0 Demolition 0 Relocation 0 Mobile Home 0 Electrical 0 Plumbing 0 Mechanical OPool 0 Spa ORetaining Wail OSolar OOther &G(y I 2 PRmmKMAnoN FOR OFFICE USE ONLY ?9"1.; A~+bm tlulldlng or Sum No. Nearest Crm Street 5ul-w F bL6" a ON Lot No. Subdlnsron NamdNumber Unit No. Phase No. __ . "" . . . . -. -. . .. . . " . 02 Energy Cala 0 2 Structural Calcs 02 Soils Report 0 1 Addressed Envelope USE NAMF INSURANCE COMPANY c E -( Certltlcate of Exemptlon: 1 certlty that In the pertorman& ot rhe work 1or Whlch thls perm11 IS Issued. I Shall not employ any person I" any manner so as to home subjex to the Warken' Compensation Laws of California. mum NO& C/QU~+, EXPIRATION DATE / a - / 9 SIGNATURE DATE 0 I, as owner of the property or my employees with wages as their sole compensation, will do the work and the structure is not intended or Owner-Bullder Declaration: 1 hereby atflrm that 1 am exempt from the Contractor's license Law tor the tollawtng reason: offered far sale (Sec. 7044, Business and Professions Code: The Contractor's License Law does not apply to an owner of property who builds or improver thereon, and who dm such work himself or through his own employees, provided that such improvements are not intended or offered for sale. If, however, the building or improvement is sold within one year of completion, rhe owner-builder will have the burden of proving that he did nor build or improve for the purpose of sale.). 0 I, as owner of the property, am exclusively contracting with licensed contracton to construct the project (Sec. 7044, Busings and Professions Code: The Contractor's License Law does not apply to an owner of property who builds or improves thereon, and contracts for such projecu with conuactor(s) licensed pursuant to the Contractor's License Law). 0 I am exempt under Section Business and Professions Code for this reason: (Sec. 7031.5 Business and Professions Code: Any City or County which requires a permit to construct, alter, improve, demolish, or repair any structure, prior to its issuance, also requires the applicant for such permit to tile a signed statement that he is licensed pursuant to the provisions of the Contractor's License law (Chapter 9, commencing with Section 7000 of Division 3 of the Busings and Professions Code) or that he is exempt therefrom, and the basis for the alleged exemption. Any violation of Section 7031.5 by any applicant for a permit subject, the applicant to a civil penalty of not more than five hundred dollan [$.500]). SIGNAlllRe Mn? COa Is the applicant or future building occupant required to submit a business plan, acutely hazardous materials registration form or risk management and prevention program under Sections 25505, 25533 or 25534 of the Presley-Tanner Hazardous Substance Account Act? Is the applicant or future building occupant required to obtain a permir from the air pollution control district or air quality management district? Is the facility to be constructed within 1,000 feet of the outer boundary of a school site? IPANYOFmAN~AREYE$APINAL~~~n?OFOCCUPAN~~YNOTBElSSUED-JULY1,1989UNIPSS~APPUCANT 0 YES OYES 0 YES 0 NO 0 NO 0 NO HAS m OR IS MFE~~~G nce wuummas OF nce oma OF EMERGENCY mwa AND m AIR FO-N OD~OL DISIIUCT. I hereby altmn that there IS a constructm lendmg agency lor the performance of the work lor Whlch thls permlt IS tssued (sec 3097(1) unl we). LENDER'S NAME LENDER'S ADDRESS 1 certlty that 1 have read the appllcatron and state that the above lnformatlon IS correcr. 1 agree to comply wlth all Clty ordlnances ana State laws relating to building construction. I hereby authorize representatives of the City of Carlsbad to enter upon the above mentioned property for inspection AND EXF'ENSFS WlUOl MAY IN ANY WAY ACCRUE AGAINST SAID (TIY IN mNSEQUENCE OF niE GRANTING OF llm WIMFI: MU: An OSHA permit is required for excavations over SO" deep and demolition or construction of structures over 3 stories in height purposes. IAlsoffiREEmsAvE~EMNIEYANDKEEp~~~(TIyoFuRIsBIu)ffi~~Au.IuB~JuDG~cosIs " CITY OF CARLSBAD INSPECTION REQUEST FOR 02/25/94 PERMIT# CB940005 DESCRIPTION: REPAIR FOUNDATION INSPECTOR AREA TP PLANCK# CB940005 OCC GRP CONSTR. TYPE NEW TYPE: MISC JOB ADDRESS: APPLICANT: SOIL ENGINEERING CONSTRUCTION PHONE: 619 741-9170 1913 ALGA RD STE : LOT : OWNER: CONTRACTOR: REMARKS : MH/ROSS/ INSPECT0 SPECIAL INSTRUCT: TOTAL TIME: CD LVL DESCRIPTION ACT COMMENTS 11 ST Ftg/Foundation/Piers " " " - ***** INSPECTION HISTORY ***** DATE DESCRIPTION 012794 Ftg/Foundation/Piers 022294 Steel/Bond Beam ACT INSP COMMENTS PA PD AP TP POST PILE FTNS INT. SLAB-PENDING ENG. APPROVAL c . CML ENGINEERING CONSULTANTS 619 So. Vulean A~auq Suite 210 C. J. Rand19 P.E, Resident Endnltar, Callfmnia 92024 phone: (619) 5444124 February 21, 1994 Fm (615') 942-6043 City of Carlsbad Building Inspection Department Carlsbad, California 92009 2075 Las Palmas Drive Attention: Building Inspection Department Slab and Reinforcement Observations Ross Residence 1913-F Alga Road Carlsbad. California Gentlemen: This letter has been prepared to confirm that Civil Engineering Consultants has observed the preparation of the slab subgrade and reinforcing steel placement for the slab-on-grade at 1913-F Alga Road, in Carlsbad. The purpose of these observations was to assess the conformance of the slab subgrade and reinforcement preparation with the intent of the construction drawing prepared by Soil Engineering Construction. An engineer from this office visited the site on February 22, 1994 to observe slab subgrade and reinforcement preparation. Contractor retied steel reinforcement to comply with the construction drawing prepared by the undersigned. Our observations indicated that the slab and reinforcing steel placement comply with the construction drawing and was approved for concrete placement. -0oo- additional information, please feel free to call us. If you have any questions regarding our report, or require Very truly yours, CIVIL ENGINEERING CONSULTANTS L-hWQa JJ%&" Charles J. Randle, R.C.E. 22096 JwN:cJR:oo1 CNIL. STRVCTUPAL, AND SOILS ENGINEERNO GEOLOGY .SUtiVEY CERTlFlED INSPECnON .SOIL AND MATERIM TESTING FEPSl0lLilV STUDIES CONTR4Cl MANAGEMENT N.C.E.E. #4170 CA R.C.E. #G22098 AZ RC.E. #I1971 0 NV R.C.E. #3037 0 WA C.E. 110776 ESGIL CORPORATION 9320 CHESAPEAKE DR., SUITE 208 SAN DIEGO. CA 92123-1021 (619) 660-1468 January 11, 1994 Mr. Pat Kelley Building Official City of Carlsbad Carlsbad, CA 92008 2075 Las Palmas Drive RE: Plan Check #94-05 Address: 1913 Alga Rd., Unit F Carlsbad Dear Mr. Kelley: Transmitted herewith are plans for proposed foundation repairs, to attempt to mitigate continued settlement of the existing foundation and to further prevent resulting structural damage. Esgil Corporation cannot offer any guarantees that the proposed system will resolve the.present problems, nor should the City offer may result in enhanced foundation support system from the current such representation. However, acceptance of the proposed remedies situation. At the time of permit issuance the following should be noted on the plans: "Prior to the City building inspector approving final inspection, the responsible design professional shall notify the building official, in writing, that the proposed foundation repairs have been installed in accordance with the design". Sincerely, ESGIL CORPORATION Ali Sadre, S.E. Plan Check Engineer AS/cc ESGIL CORPORATION 9320 CHESAPEAKE DR.. SUITE 208 SAN DIEGO. CA 92 I23 (619) 560-1468 'PY ?LAN CHECK NO: os 4rt - 03 SET: r EUPS PROJECT ADDRESS : lq I3 &\.%a ed . *F DDESIGXR v 0 necessary and substantially comply with the jurisdiction's The plans transmitted herewith have been corrected where building codes. fl with the iurisdicfion's buildins codes when minor deficien- The plans transmitted herewith will substantially. comply - ' cies idenfified - are resolved and checked by building department staff. 0 identified on the enclosed check list and should be corrected The plans transmitted herewith have significant deficiencies and resubmitted for a complete recheck. The check list transmitted herewith is for your information. plans zre submitted for recheck. The applicant's copy of the check list is enclosed for the The plans are being held at Esgil Corp. until corrected 0 jurisdiction to return to the epplicant contact person. m The applicant's copy of the check list has been sent to: Chuck 'i2&6d\r CEL . bi4 3 .du/~- QUCC, 81 Esgil staff did not advise the applicant contact person that plan check has been completed. 0 Esgil staff did advise applicant that the plan check has been completed. person contacted: Date contacted: Telephone B - 0 REMARKS: By : rL\, sAhe Enclosures: Jeonb, ESGIL CORPOMTION OGA 0 CM 0 PC I t JANUARY 5. 1994 TO: DORlSlMlKE FROM: PAT K. RE: CB 94-5 FOUNDATION REPAIR I WANT ESGIL'S ENGINEERS TO APPROVETHIS PLAN PRIOR TO AUTHORIZING ANY CONSTRUCTION ON THIS PROJECT. PLEASE HAVETHE APPLICANTCOMPLETE THE APPLICATION PRIORTO ISSUANCE, SUCH AS DESCRIPTION OF WORK AND WORKERS COMPENSATION CATEGORY. ALSO, THE APPLICATION LISTS ONE ADDRESS AND THE PLANS SAY TWO BUILDINGS (THEY ARE MULTI-UNIT BUILDINGS). PERHAPS A SITE PLAN ACCURATELY SHOWING WHICH UNITS ARE SUBJECT TO THIS REPAIR PERMIT WOULD FOCUS THIS DISCREPANCY. / September 20, 1993 Revised September 21, 1993 Casitas de la Costa Homeowners Associatbn c/o William Wyman, Attorney at Law 6994 El Camino Real, #201 Carlsbad, CA 92029 RE: Summary of Findings at 1913 and 1937 Alga Rd., La Costa. CA - Ref. No. '93-283 Dear Mr. Wyman: The following report presents additional iriformation which has been developed since our interim report dated August 24, 1993. Also as a part of this transmission is an estimate to construct three areas which are deemed necessary for first phase repair. Since our meeting of August 24, 1993 this office has advanced four observation wells located across the northerly perimeter of the building 1913 .and they were located in such a manner as to incorporate units D, E, F, and G. An additional two borings (i.e. observation wells) were located at the southerly end of building 1937 unit G. As of this date moisture is beginning to collect within these wells with exception of the well located in front of the Ross residence (1913-F). In this observation well water was located an approximate 5.5 feet below grade. Due to the nature of the impervious soil material the observation wells will be reflective of the actual groundwater conditions within the coming two to three weeks. Structural observations were conducted within units E, F, and G at building 1913 on September 17, 1993 by the undersigned and Osman Pekin, PE, PhD. the primary reason for our site visitation was to evaluate the conditions of the adjacent units to the Ross condominium and more particularly to determine the conditions of the timber roof system consisting of roof joists and a ridge beam, which is common to both units F and G. However, unit E is constructed on a separate system of bearing walls and has little or no common support systems with units F and G. + 456 N. Outnce Street Escondldo. CA 92025 * (619) 741-7645 * FAX 1619) 741-9170 September 20, 1993 Casitas de la Costa Page two Conclusions based upon visual observations by Dr. Pekin, P.E. indicate that the structural capabilities of the roof system is adequate at the present .time. There is no cause for immediate repairs or associated danger to the residents or the structure. However, it is important to recognize that the continued observation of the two units F and G should be considered relative to the forthcoming several months. This particularly relates to the wood support structures and additional items which will be mentioned later in the text of this report. A system of two survey monuments were established at the front and rear of the condominium unit F. The second check on September 15, 1993 reflected no movement. Based on this relatively stable condition it has been determined that the continued monuments evaluation will be done on a monthly basis, pending any change in movement detected at either the north or southerly foundation. The extent of repairs summarized here for your information will be further expanded upon within the text of this report. The first and probably foremost requirement will be the installation of a "French drain" cut off wall constructed across the northerly wall system for units F and G. A detail for this construction work is also attached for your edification (see plate D). The approximate length of this French drain system will be on the order of fifty lineal feet constructed to a depth of at least 6 feet (contingent on the location of the footings for units F and G.) The easterly terminus of the French drain will require connection to a closed system which will then run underground to the southerly parking lot and be outletted in such a manner as to not create any erosion and align with existing drainage. The estimated cost for this type of drain system is attached in Appendix G. Installation of four 4" diameter hydraugers, entering beneath the footing are further recommended to be located as noted in exhibit C, where as these borings will be installed horizontally beneath the deepened footing along the southerly wall. This system will then be incorporated to a closed drain system to be outletted through the slopes and ultimately to toe of the slope and into existing drainage facilities. The interior slab in the lower portion of the Ross condominium should be removed in its entirety. Measured from the southerly rear patio door approximately 14 feet into the condominium. The removal of this slab and of course ultimate replacement is necessitated due to the extensive cracking and ground water intrusion through the slab concrete mass either by capillary action or in some areas where the cracks are wide enough to provide a conduit for moisture intrusion. However, portions of the slab reflected a rather heavy concentration of mildew parallel to and adjacent to the slab on grade patio door way. The results of core boring tests reflected the water conditions throughout the sub-slab area in the Ross unit. September 20, 1993 Casitas de la Costa Page three To further assure that the gross foundation stability of the condominium units can be relied upon a system of mini-piles are recommended to be placed around the periphery of the load bearing footing within the lower half of the split level unit F. These piles should be driven to refusal and will be designed to withstand well in excess of the design loads of the wood frame condominium structure. These piles will logically be spaced at or about 5 feet center to center and then be connected in a manner as to assure vertical support for the existing bearing foundation structure. Please be advised mini-piles are for vertical support only and at this particular plan of repair, lateral support appears to be unnecessary. In the event this situation develops lateral supports may simply be the inclusion of a tieback located at the condominium unit to depths necessary to obtain the ability to withstand any lateral movement. These tiebacks can either become a part of the pipe-pile system or some manner of grade beam system which may have to be constructed at a later date. However, based on our evaluation of the surrounding site and the report which has been previously provided to the homeowners association by American Geotechnical, it becomes evident that the degree of the stress relates almost entirely to the excessive water which has been noted throughout our investigation. To further determine the source of the underground water problems it is highly recommended that existing ponds and waterways throughout the development be tested with a dye to trace the course of any waters which may have leaked through the waterway system either through cracks, overflow or other means of water loss. Regarding the continuing sow of water movement throughout the condominium project, alternate aesthetic landscape methods should be thoroughly evaluated by the homeowners association. The undersigned and several of my associates who have consulted with me on this project conclude that the constant exposure to water and moisture does nothing but precipitate the problem and in fact works almost in a catalytic manner. In order to maintain the apparently well received aesthetic value which incorporates the running water, appropriate means should be employed to ensure that this system i.e. waterfalls and streams are not involved in any leaks. In summary the work necessary in a phase I approach to the repair of unit F and parts of unit G relates to the removal of the conditions causing the settlement, unacceptable moisture conditions and essential differential movement throughout the structure; this specifically relates to groundwater control. September 20, 1993 Casitas de la Costa Page four Requirements for repair of the slab in the Ross condominium is necessitated by the significant amount of water encountered during our investigation. Normally adequate drainage would solve this type of excessive moisture content. However, the impervious nature of the soils and the medium to highly expansive nature of these soils which comprise the foundation system for building 1913 will be slow to give up water thus a system of drains or other means would not provide a prompt solution to the over wet conditions. Therefore it is prudent to remove the slab and a minimum of 24 inches of sub slab soil to be replaced with coarse gravel (not sand) and compacted to an equivalant 95% of relative compaction. The gravel shall be covered with a visqueen 6 mil. minimum membrane overlain with at least 2 inches of sand. The concrete slab shall be at least 5 inches in thickness, all edges shall be constructed to prevent bond with the existing footings. Minimum slab reinforcement shall be #4 bars at 12" O.C. each way placed at the mid point. Finally some effort will be made to release any additional water which has collected beneath the zone measuring 24 inches below the bottom of the proposed new slab. These corings and drainage instruments will aid in the final correction to the groundwater conditions which are so prevalent at unit F. This procedure requires four lateral drains be located below the existing southerly deepened footing and be outletted through the southern slope in a controlled manner to the existing drains located in the parking lot. The basis of this report initially was to direct our attention. to the conditions surrounding the condominium owned by Ms. Ross mainly unit F .within building 1913. However, in light of the surrounding conditions which has been previously reported by American Geotechnical and our visual observations of the slopes (the trees leaning significantly downslope) indicate that there is an underlying problem within the immediate area which require prompt attention. This consideration may best be handled by the installation of slope monitoring devices to assure that the slope stability is adequate and will not affect the structures. Further observations of the water wells is recommended to ensure that the groundwater conditions do not reach unacceptable limits. The monitoring which is recommended for the timber structural members in units F and G could very easily be accommodated by the inclusion of "tattletale" monitoring tapes which will be installed at various critical areas. Constant observation and measurement of these devices will indicate the continued movement and/or distress. Additionally measurements should be taken to ensure that the structural members are not undergoing any sign~f~cant differential settlement. At first observation it would appear that the large structural members have undergone some 'form of torquing from front to back (i.e. from north to south). The movement apparently is significant enough to create the crack observed. However, it is difficult to establish the exact direction of the movement September 20, 1993 Casitas de la Costa Page five when structural members undergo both rotational and settlement deformations. We have included a compilation of construction costs which have been developed by our firm for your board of directors review and hopeful approval of this work. It is the undersigned's opinion that the extent of work be limited to the proposed water/French drain system along the northern wall, slab replacement and the monitoring devices. The work necessary to auger and create additional drainage facilities will be an important part of the repair; however, this might be set aside or become a part of Phase I1 operations contingent on the results of continued monitoring, evaluations of the slope stability and determination of the extent of water caused throughout the system. We look forward to your review of this report and the attached preliminary report. Our sketches and recommended corrective procedures are all attached as Plates A through G. Thank you for this opportunity to provide our service to your organization. Sincerely, , A Charles J. Randle, PE RCE 220% CA CJWsr cc: William Wyman Leslie Leonhardt @man Pekin Roger Zimmerman ill I Sottom @ 6.5‘ Ltefusal or concrete debris - FIELD LOG I m I I 1 I I c I CC Dark Brown, soft, saturated sc/cc nottom @ a 1/2' I Gray Brown Fine Sand, traces of clay moist Numerous chunks of asphalt and concrete debris Wet Bottom of Boring 12 3' = Urive Samples 1 PROEE=T HALE Alga 1913 IFCURE HC. Plate A-4 L- I Dace: 8-16-93 Field Reo.: CT Drill Rig: Hand Awered BORW NO. 2 SOIL DESCRIPTION Fill Bottom of boring 4 +/- feet Refusal or chunks of asphalt and concrete debris FIELD LOG T i i I I i 'i' i PLATE B BORING LOCATIONS I I - " __ " -, . __ .. . .. ." .- - " -. . - - - . .- -- - - - - .. .- "" '' .. - This procedure requires four lateral drains be located below the existing southerly deepened tooting and be outletted through the southern slope in a controlled manner to the existing drains located in the parking lot. ,m PLATE C MINI-PILE/HYDRAUGER LOCATION: m cn m m JJ m 77 0 ;D "I 0 JJ > Z > 0 m H m "I 0 n 0 cn m 0 r r Z rn H Z 0 n "I I -n 0 Z c Z -4 H .. cn -+ 0 m rz- "I LJ- m I+ r -rl JJ m Z c"1 Z -0 zn < om r-" .U r- f- 5 "I m m GENERALNOTES 1. The pipe pile design contained on this Engineering Construction. Inc. The sheet is the property of Soil details presented illustrate the patented Mini-PileTM system. This Engineering Construction. Inc. and its design is for the sole use of Soil clients. 2. Drive Mini-PileTM with properly operating 90 lb. pneumatic or hydraulic hammer. 3. Unless otherwise noted. all concrete shall attain a minimum strength of 2000 psi at 28 days. 4. Rebar shall be gr. 40 or better. PLATE E - 2 LABORATORY RESULTS Location Cores H-1 @ 11" 58" 36" 72" H-2 @ 21" H-3 @ 16" 36" 65" 84" 98" Borings B-1 @ 56" 72" B-2 @ 36" DENSITY TESTS Location Boring B-1 @ 56" M.C. UBC (Exp. Index) 24.5 59 26.0 22.1 23.3 22.0 20.0 22.6 20.7 22.0 25.6 13.0 20.0 15.0 87 03 MAXIMUM DENSITY /OPTIMUM MOISTURE Density Max. Den. Opt. Moist. #/C€ X/C€ % 108.2 121.3 13.0 PLATE F - SOIL -v- Casitas de In Costa Homeowners' Assn. c/o William Wyman, Attorney at Law 6994 El Camino Real #201 Carlsbad. CA 92009 Suhject: Investigative Report, suhsurface conditions and associated settlement Reference: SEC, Inc. and distress noted at 1913 Alga Rd., Unit F, La Costa, CA Bid No. 93-283 Dear Mr. Wyman: The following report is considered to be interim, pending our complete report which will include nll soil data information and boring logs relative to our investigation of the subject site. Essentiillly, the results of our investigation reflect the continued moisture intrusion due to a lack of i\de(]uafe drainwge, both surface and suhsurface, in and around the building wllich is known as 1013 Alga Road. Our investigation was directed only at Unit 1913-E Prior to our investigation we reviewed the reports by American Geotechnical, which are as follows: Mmh 7, 1987 and December 7, 19x7, file No. 20221; file No. 20623 which is dated November 7, 198X, M~ch 13, 1989 and August 23, 1989. Information presented by American Geotechnical is, for all intents and purposes, identical to the findings which we encountered during our investigation. It is possibly significant to recognize that the measured differential settlement repoeeti hy American Geotechnical across the rear portion of the condominium lower floor has increased nominally, by possihly .25 inches, based on our recent measurements. Our investigation involved the mapping of the numerous cracks noted within the slab-on- grade and is reflected in the attachment to this report. In addition to this original survey of the cracked areas, a m:lnometer was run throughout the first and second floors of this rlnit. The mnximum settlement appears to he on the order of two inches at the sliding glass door exit to the concrete patio, measured relative to the gradient observed at the laundry entrance area (see sketch). The problcm is a lack of adcquatc subsudacc drainage aud surface drainage controls. This condition continues to influence the foundation system lor Unit F. Moisture intrusion ccmtinues throughout the basement area and is reflecled in sxtrcnxly high saturated moisture contents in. three Iccatiom where concrete co:cc I?!!::: cut t!iwugh ;!IC lowcr shb. Upo~ c~~~~plction of the coring of the concretc 3 Iland auger was uscc! tn samplc to depths varykg from three to nine feet. AI1 moisture contents were in cxxss sf 20%. with some as liigh as 26%. T!we values a:e at, or near, saturatian. To compound this cmdition, thc soils wiliill !IG.;~ besl ni~~surtxi rcflcc: :I ltigll crpansivc hc~vc po!cllti2!. Casitas de la Costa Homeowners' Assn. August 24, 1993 Page 3 This system can then be constructed in a manner t pilc cap and, ultimately, a new grade beam to be placed along the existing y foundation stemwall. This new structural system may then be jacked back to the approprkte elevations. It should be noted that duiizs t11c jacking process extrenwcarz should-be t&en..to assure thal.the structural - member, Le. exposed timber roof system, nct ufidcrgo azy further distress-and, with the reestablisl~ment of initial garie, the IongiPadinal Sties cracks should be reduced. In the event this stress is not relived within the timber struhra! system, further analysis should be unuertakcrl to assure that the niemhers he. adequate sirxturrrl capcity. Repairs in rhis area arc not .witithin !:ic.purview of this report; howcvcr, tkis- not a significant!y cxpcnsive rcpair sb~uld il be repired. The slab-on-grade nlay :hen be reconstructed on a ytem of =hi-piles drivcn to refusal at approximately eight foot on center grid pattern. The slab should te five inches in thickness and reinforced according to the structural engineer's standards. This new slab will then be constructed in such a maniier as to preclude any further distress from settlement and the expansive soil andition will be negated due to the removal to a depth of 24 inches and replaccmeut with gravel. Finally, the exterior slope and lower retaining wall which was previously recommended for repair should not be overlooked. The lateral resistance to thc structure's stability is dependent on a dense and adequately constructed engineered slop. This will require removal of the expansive materials and replacement with materials w!l!ch are approved by the soil engineer. These materials should be non-expansive and granular in nature. Adequate drains will be required behind the cut areas where the slope has been removed and drained in a positive manner away from the building and into the cn-site drainage system. The replacement should be done according to accepted eagineering practices relative to proper and adequate compaction. This operation should be reviewed by a representative of this office. in order to ensure that the work is completed according to applicable standards. The lower retaining structure should be replaced with an adequate masonry wall and footing system placed at such a depth as to ensure the structural integrity of the wall against overturning, as noted within the existing StiudViC. Our final report wili be forthcoming; however, I hope this information will be adequate in order to permit the Homeowners' Association to evaluate the conditions surrounding 1913-F Alga Road and !he decision for re~edial repair to be undertaken without furthe: delay. In closing, 1 wish to ir?dicaie that I reviewed this property in the 1970s wit11 similar drainag control recommendations. At that time the repairs were considered to be excessive and too expensive. .., - . ... Casitas de la Costa Homeowners’ Assn. August 24, 1993 Page 4 Approximately 10 years later, American Geotechnical has reported the situation and made recommendations which again were not followed by the Homeowners’ Association. It is now August, 1993, approximalely two to three months away from a new rainy season and the distress continues will1 little or nothing having been done to cxacerbate. .the ccrldition which has been discussed herein. I hope that youi prudent evaluation of this informztion and the conditions surrounding Building 19i3 be reviewed in its entirety to ensure that the dist:ess described in this ir.terim report can be promptly corrected. RCE 22096 cc: Wyman (2) HOA (5 j Leslic Lzonhart (2) L - " Y-Y . .. ~- I I I wc PATm 3 r I li~ " " " " I ;Et Dark Brown w/C)live clay silty clayey fine sands SC/CL Bottom i3 6.5' FIELD LOG H' f-i I t Date: 8-16-93 Field Rep.: CT dJ Drill Rig: Hand Auger i2 BORW NO. H-3 SOIL DESCRIPTION I:n"rrP+P pnrp '{ I/y" SM Yellow Brown, Loose, Wet, SM CC light Olive gray, soft, wet to saturated, CC/SC CC Dark Brown, soft, saturated sc/cc Bottom cd 8 1/2' I Date: 8-16-93 Field Rep.: CT Drill Rig: Hand Auger H-2 BORWQ NO. SOL DESCRIPTION Concrete core 3 1/2 'I Olive gray, soft, very wet, CL se. wet. silt" fine sand Itefusal or concrete debris 1 PROJECT NAUZ Alga 1913 IFGURE HC.