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Home My WebLink About1994-01-11 - AGENDA REPORTS - REPAIR SOUTH RETAINING WALL (2)G' AGENDA REPORT City Manager Approval Item to be presented by: Jeff Kolin, Deputy City Mgr Pub. Wrks CONSENT CALENDAR DATE: January 11, 1994 SUBJECT: Repair South -Side Retaining Wall DEPARTMENT: Public Works BACKGROUND In December of 1991 the City of Santa Ciarita (City) purchased the City Hall facility located at 23920 Valencia Boulevard. Shortly thereafter, some of the owners of the condominiums with garages that back up to the south -side retaining wall brought to the City's attention the fact that their garages were experiencing water leakage problems during the rainy season. They mentioned that this problem has been going on for a number of years and that they would like the City's cooperation to resolve it at this level. After this initial communication, staff reviewed the situation and inspected the wall and garages and determined that a problem did exist. Staff then enlisted the help City engineers, various concrete contractors, and building supply companies to review and determine the cause of the leakage, and identify possible solutions. Upon reviewing the situation, it was determined that two main options exist to alleviate the water leakage problem: 1. Construct an impermeable barrier between the planter boxes and the wall; or, 2. Design and construct a french drain system Although option two is the better of the options, it is far more costly requiring pumps, electric runs, and trenching in the City Hall parking lot. Option one is recommended by the engineers as it offers nearly the same benefits without the costs and equipment. Further, staff is confident that the barrier, once properly constructed, will hold off and/or divert water away from the garages therefore allowing it adequate time to percolate into the ground. Attachment one graphically illustrates the plan designed by City engineers for option one, and identifies the specifications and materials necessary for the work. RECOMMENDATION Direct staff to hire a contractor to implement the solution identified in option one. Further, direct and authorize an expenditure of $8,500 from the City's contingency fund to complete the project. (1908r93 09;21 2213 5.32 6429 REQUIREMENTS, 1 INTRODUCTION AND POLICY The sped5cawri5, recommendarons and charts that follow are intended to provide a guide for architects, engineers, consultants, owners, contractors and others respnnsikile for the selecbory specification and m-br- mance of membrane waterproo 9ng and dampproofing. Henry Company recommends ckzse attention to details during surface preparation, installation and protection, of all systems in this section, as, after accepting the surface, the waterproofing contractor is solely responsible for the quality of the membrane installation. Wet or damaged roll roofing materialsshall not be applied. The General Contractor shall be responsible for the prevention of damage to the merntnane by other building trades until completion of project construction. Information and recommendations in this General Requirements Section are to be considered part of thc-,;e specrficationswhere applicable For waterproofing conditions not covered by these specifications, contact Henry Company for assistance HENRY CO, L 11V2 AND DAMPPROOFING 2 SURFAcfS surfaces shall be srnootr4 clean and free of foreign substances, water repellants, and form -release product& sharp protections shall be removed, and cracks, holes and voids filled and trowelled smooth with a suitable cement or mortar - Concrete block walls mut be properly constructed en poured concrete footings, reinforced with steel re -bars and solidly filled with p ured concrete. inderded mortar Joints, cracks, holes and voids shall be filed and trnavelled smooth with a suitable cement or mortar. Footings shall have a smooth, horizontal surface extend- ing a minimium of 4" from exterior face of the wall to receive the waterproofing membrane. Footing drainage by means of open Out drain tile or perforated pipe surrounded by cashed rock is recommended to reduce hydrostatic pressure Weather Precautions. As with most waterproofing products, temperatures above 65 riagmes F and dry weather are recommended for best results. Asphalt emulsion becomes irnpervi«s to water only after it thoroughly dry. With rile or no sun exposure and poor ventilation, exterior wall applications can take several days to a week, depending on drying conditions: Emulsion applications must be protected from freeBrg, water and moisture until thoroughly dry freezing of applied emul- sion mulsion can occur during the drying period at ambient temperatures up to 40 degrees F ffJ 097U5.93 09:24 'U213 552 6329 HENRY CU. V'1U3 s, • ;IIIIZIi ... Relating Hydrostatic Conditions to Assembly Selection This information Is irtended as a guide, not a Specification.. Conditions other than depth affect hydrostatic coy dins. HYDROSTATIC CONDfT10N5 MEMBRANE ASSEMBLY Hydro's'tatic Head In Feet I Pressure Ibshq. inch A�S ge Ibs./sc1 foot I LI)APPLIED HOT AFPUED pec. HWE HWM Asphalt Emusion HWM Fiberglass Base and MomlftKc 5I and Hot Yellow Glass rebri System tiphalt Numb?r of ;,avers I1me Hut EmulsionFsbric Emu s on EmV�bn M?no Pim Primer Primer S s Sheet I As haft 1 2 3 U43 026 t,30 31-2 62-5 93.7 t 1 1 1 1 1 2 { 2 3 1 1 1 1 1 1 1 2 1 2 2 2 3 3 3 4 1.73 125.0 1 1 3 I 1 2 1 2 3 5 2.1/ 1562 1 3 1 2 1 1 3 6 2.60 187.5 1 1t 3 1 2 1 2 3 7 3.01 3.47 _ 3.87 218.4 1 2 4 1 2 1 3 4 8 250.0 1 2 4 1 2 1 3 4 9 1 280.8 1 2 4 1 2 1 3 4 10 4.34 312.5 1 2 4 1 2 1 3 4 12 15 20 5.21 375.0 468.7 1 2 1 4 t 2 1 1 4 5 6.57 1 3 1 5 1 3 1 4 5 8.68 625.0 1 d 5 3 t 5 6 6 7 25 30 ! 10.85 1 13.02 781.2 937.5 1 1 1 4 L :4 6 b 1 3 1 11 3 t 7 8 PROTECTION BOARD recommended for all conditions Emulsion layers are at the rate of 3 gallons per 100 sq. ft. MONOUTHIC layers are at the rate of 6 9ellul is dr id 2 lbs. dropped fiberglass per 100 sq. ft - HOT ASPHALT layers are at the rate of 25 lbs, per 100 sq. ft. 59 99/06.93 09:25 '8213 582 6429 hE`:R1 Yu. ii1p114 SPECIFICATION HWE 1v�e1¢o*vMF%'.coni-wwrdr roa!>9 -.r- - ..�Y�� .Tr t. P..• �o- . • • , y • •• • • •T� • "111 Consists of three courses of Asphalt Emulsion with Glass Fabric Reinforcing. FEATURES ■ Cold applied -with hrush orspmy--no 5peria/ equipment required ■ Bonds to damp or dry surfocc ■ For Hydrostatic Head up to 6 feet Note' For greater hydrostatic pressures, the Baow Grade Waterproofing chart in this section lists the additional number of courses recommended. 1 GENERAL Guucj dryir iy wedLher with Letnlpelal les dbQVe 50 degrees F is required for about one week after installation. I he membrane must be thoroughly dry before exposure to water or freezing temperatures. General Requirements. The recommendations in the waterproofing General Requirements are to be considered where applicable for use with this specification. Protection of Materials. All materials shall be properly stored off the ground and protected'rom moisture and freezing. 2 PRODUCES Materials shall be manufactured or supplied by Henry Company and bearthe Henry label. Bulk delivery material shall be accompanied by a Henry Company bill of 'ading. SUMMARY OF MATERIALS PER 100 SQUARE FEET For Hydrostatic Head up to 6 feet Primer#312 Below Grade Waterproofer— (diloted with water) V/2905. gos. #312 Below Grade Waterproofer (undiluted) 3 gals, #1 83%low Glass Fabric -36" 1 ply V, #312 Below Grade Waterproofer (2 addrhonal coats at 3 gals.) 6 gals. #183 Yellow Glass Fab6c•--12' and 18 Angle Reinforcing Strips Protection Board OPTIONAL MATERIAL: #107 Standard Asphalt Funulsion may be used in lieu of #312 3 APPLICATION Preparation R is the general contractor's responsibility to provide continuously smooth, clean wall and footing surfaces, free of projections, voids, crack;, holes and foreign matter, Concrete bock shall have flush ointsand no voids, projections or depressions, otherwise a cement plaster shall be applied to provide a smooth surface Cold joints shall be Vgrooved and sealed with a core ipound compatible with asphalt and concrete Penetrations through the wall surface shag be installed comp'etely prior to application of the membrane. Pur aping equipment shall be instailed as necessary to prevent any accumulated water contact with the mem brane until It is thoroughly dryand accepted as ready for the protection board. PHmer.�Surfaces shat' be coated with a primer consisting of 1:312 Bdow Gradc ftLorproofcr (emulsion) diluted 20% with dean water applied at 11,12 gallon/100 sq. R- and allowed to dry. Membrane Application At all vertical and horizontal angles apply an embedding coat cf emuls'on at the rate of 3 gallons/10f1 sci ft and embed a 12" wide reinforcing strip of Yellow Glass Fabric, without wrinkks, centered on the angle Press the fabric into the angles to avoid bridging or air entrapment Apply emulsion on the wall by brush or spray at 3 galionst 100 sq. fL and while wet embed full width Yellow Glass Fabric, butting the corners and angles, lapping 2' on sides and d' on ends. Brush the surface to remove wrinkly and completely embed the fabric When the wall is'completely covered from finish grade line to the footing, and dry, apply a second reinforcing strip of fabric 18" wide cerdereU on the angles and comers, embedding it in emulsion as described above Apply two additional coats of emulsion at 3 gallons 100 sq. ft. allowing each coat to dry to the touch between coats 0.9:08,:9) 09:;26. U219 582 6129 HENRY (-[1. 1 x('!15 Protection Board When all areas of the membrane have cured thorouahly, the waterproofing contractor shall fumish and irstalf panel board of suffick-m thickr>ess to protect the mem- brane from backfill damage. The board shall be held in place by spot apple of plastic cement or bracing, Do not nail the board in place or otherwise damage the membrane Back fill Tne General COrTdactcx must be advaed to use care in repb&g the back fall and in compacting it next to the membrane In areas where hydrostatic problems are e4ected file drains at the footing with coarse aggregate surrounding the pipes are reCOrnn ed 61 -08,93 09: HE\K] (U. 4107 STANDARD ASPHALT EMULSION Protective Waterproofing Coating for Roofing, Masonry, Metal and the Monolithic System 1. DESCRIPTION: Henry *107• is a versatile waterproeffng compound, designed for the protective coating of roofing materials, and metal and masonry surfaces. Made from selected asphalt, emulsified with bentonite day and water (no soivenu), it is cold applied; non.flarnMZWe while wet, corrosion -resistant, and waterproof when dry. Weathers uniformly and does not crack, "anigator." run or sag under extreme weather conditions. Widely used as a coating for composition and metal roofs. Excellent for waterproofing foundations and walls beiow-stride, and for lining planters. Resists most corrosive fumes and spray. Complies -with D -i237-87 Tyos ill 2. RECOMMENDED USES: Henry 1"07 is recommended forihe following applications: As a protective coating for new or existing composition roofs with•srhooth (not gnveled) surfaces. • As a base coat for reflective coatings. • Wateroroofing exterior foundation and basement walls, below -grade. • Anti -corrosive protection far metal roots, steel structures, and tanks above or below eround level. • Waterproof lining of planters and septic tanks, • With Class Fabric reinforcing, for sealing of roof flashings and repairs. • With chopped fiberglass reinforcing in the Henry Monolithic System for roofing and waterproofing. NOTE: Specifications available on tequest. 3. TECHNICAL DATA: fuse -- Asphalt, bentonite clay, and water. Solids Content — Approximately 50% by weight. Color — Dark brown when wet; dries black. Odor -- Essentially none. Consistency —Thixotropic semi-liquid, spravable. Flammability — Before dry - ,ion-fiammableAfter dry - 4urns slowly: Weight Per Gal- — Approximately 81bs. Freezability — Keep irom ireezing. Container Sizes — Quart, Galion, S Gallon, SS Gallon: Bulk loading of customer's tank truck at Henry plant. 4. DIRECTIONS FOR USE: Be stere surface is dean and in good repair. Hose down thoroughly to remove all dust. din. and residues_ Scrub areas where water ponds with detergent and water, and rinse thoroughly. Prime concrete and masonry with this coating thinned by stirring in Z% water. Remove rust scale from metal by wire brushing. A. Carefully inspect area to be coated, including around pipes, chimneys, equipment, roof edges and walls_ Repair all tracks. breaks. and hales by cmbedding open mesh Guys Fabric between 2 heavy coats of Plastic Roof Cement, or 1107, applied over and at least 2 inches beyond repair. Stir coating thoroughly. A tiOter bond will result if surface is dame when coating is applied, but it in be free of standing water. 8. .10 renew growth surface roof , reW me valleya attd teal [lashings: Use a layer of roofing - type Glass Fabric like Henry 0183, applied without wrinkles or buckles, as reinforcing between two coats of Emulsion. Apply each coat at the rate of 3 gallons per 100 sq. ft- Uniformly t.Un formly coat entire surface. C. As a maustettance cortin; for smooth roofs in good conditionu as a top coating for new btillF-up roots, for metal mot r4 or a bae coat for reflective codings such at Henry White or Akrmimmt: Apply Emulsion by roofing brush or spray. uniformly covering the suriace at the rate of 3 to 6 gallons per 100 sq. ft. Brush applications of over 3 galions per 100 sq. ft. should be applied in two coats. Brush the second coat at right angles to the first. rs.e 1.12 9.a7 89%08.91 49:3:7 V219 5fi2 8429 HENRY Co. 5. 6. 7. a. 9. If a reflective coating is also to be used, allow the emulsion to weather 3 to 7 days before topcoating. D. For Waterproofing Below -Grade foundations: All holes, cracks, and recessed joints in concrete or concrete block must be filled with cement mortar for a tmnnth, clean surface without depressions of projections. Then prime entire surface (either "green" concrete or cured) with Emulsion diluted try% with water, at the rate of 1th gallons per 100 s4. ft. For waterproofing to 2 feet below grade, apply one undiluted coat of Emulsion over primer coat, one layer of Glass Fabric, embedded in coating without wrinkles, and a second coat of Emulsion over fabric. Spread each coat at the rate of 3 gallons per 100 sq. ft. Let dry between coats: Emulsion must always cover glass fabric. At depths 3 to 5 feet, apply a third rout si Emulsion. At depths ply one mo 15 torese a layerecond of fabric ander foneric more acoat of Emulsion a fourth coat of Cmulsion.Beyond 15 feel, appy Y for each additional 5 feet below ground level. Always butt fabric lu angles and corners. Reinforce angles and corners with 2 layers of fabric strips 12' and 18' wide, applied under and over'full width fabric, each embedded in Emulsion and applied snugly without air' pockets. The dry membrane must be protected from back -filling damage by installing suitable protective panel board, adhered with Plastic Cement. APPROXIMATE COVERAGE: Typically 3 to 6 gallons per 100 sq. ft. on roofs, depending on surface condition and purpose of coating. Multiple coats may be used un flat roofs and in critical areas. Do not apply more than 3 gallons per 100 sq. ft. in a single coat. DRYING: Usually 6-10 hours, with ideal weather conditions. Drying will be slower, 2to 7 days in cool, damp weather. Allow to dry between coats, On critical applications, such as multiple coats on beluw-grade foundations, let cure at least one week, with good air circulation, before exposure to water, or backfilling. Use forced air if needed. Coating becomes waterproof only after drying thoroughly. CLFAN-UP Fresh coating can be removed with water. Use kerosene or mineral spirits if material has started to dry. keep brushes in water when not in use. MAINTENANCE NOTE: To reduce deterioration "used by water-toltihle residues that collect in roof areas with poor drainage, hose off the residues during periods of no rain. APPLICATION PRECAUTIONS; This coating is nut tecommehdcd over gravel, over shingles of any kind, or over old roofs that are too dry and brittle to withstand the shrinkage stresses that Orem ditt:i the application of any coating. The usual age limit for roofs to be coated is 7 to 10 years, but this varies with prevailing temperatures and direction of slope.: Do not apply when air temperature is below 600F, or if there is a threat of rain or temperatures below 40°F within 24 hours. 9/67 Page 2 of 2 V U t1 7 CITY OF SANTA CLARITA 1 SANTA FE CONDOMINIUMS I � Q �o�Pv o d? BLOCK WALL IL NOTES: 1 SANTA FE CONDOMINIUMS I � Q �o�Pv o d? BLOCK WALL TYPICAL CROSS-SECTION NTS m Tmt I � I � m 1111 f£ I I CITY OF SANTA CLARITA III WALL WATERPROOFING PROJECT COAum m%aff" upwa Jf = VAINDA RAV, ME 300 BwfA pp. O fam m ff""n-aQ /FAX 039 Z"m TYPICAL CROSSECTION °'°'`° mn art. a a�n 1" (SEE NOTE # 5) NOTES: 1. SANDBLAST WALL BEFORE APPLYING GRADE TO DRAIN ASPHALTIC EMULSION 2, SEALANT SHALL BE #107 STANDARD _ _ ASPHALT EMULSION OR ANY SIMILAR SEALANTOF COMPATIBLE QUALITY PER THE I I APPROVAL OF THE ENGINEER PARKING LOT � I 3, LOCATION OF EXCAVATION TO BE I_ VA IES DETERMINED BY PROJECT ENGINEER 0.5'- 3' PRIOR TO CONSTRUCTION. 4. NUMBER 107 STANDARD ASPHALT TEMPORARY EXCAVATION SMOOTH CEMENT STUCCO EMULSION SPECIFICATION IS AVAILABLE 1/4" THICK ON REQUEST FROM MR. MILAN LIMIT OF TEMPORARY CERNOSEK,P.E., PROJECT ENGINEER EXCAVATION . ° AT (805) 286-4136. SEALANT 5. SEALANT MUST EXTEND 1" ABOVE (#107 STANDARD ASPHALT EMULSION FOOTING FINISHED GROUND REINFORCED W/YELLOW GLASS FABRIC) GARAGE FLOOR 4^ 6. RE-ESTABLISH VEGETATION AND IRRIGATION SYSTEMS TYPICAL CROSS-SECTION NTS m Tmt I � I � m 1111 f£ I I CITY OF SANTA CLARITA III WALL WATERPROOFING PROJECT COAum m%aff" upwa Jf = VAINDA RAV, ME 300 BwfA pp. O fam m ff""n-aQ /FAX 039 Z"m TYPICAL CROSSECTION °'°'`° mn art. a a�n