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SW0001-SP010919acheco Koch Consulting Engineers 5w 0 (3 0 1 TELECO MMIINiCATIONS +AVER LETTER Date: 2zi2 1 PK No: Qd 36 -01. T O: ) G i -rcx o r Name r � �.�. n ,ne f 1 Company �7 Fax Number Re: L �• From: E rgd a � e Fax Number: (972) 235 -9544 0 Comments: Total Number of Pages Transmitted (Including this cover letter): 1 operator: 6TIt, Time: J o. , 3v ,M T00 xn3 jjnsuo3 gDox ODOT ed 6646 4SZ ZL6 YVA 6Z :OT (13.14 TO /61/60 bbS6 Ste? �L5 Trex Usage Guidelines Trex is a wood polymer lumber that is suitable for a wide range of uses such as decking and landscaping. Trex is not intended forprimary structural members such as load beating columns, joists, stringers and beams. In most installations, a span of 16 inches on center using a minimum of 3 joists will provide excellent results. Please refer to the Trex Span Chart for specific requirements (NER -508). Getting Started • As with any woodworking project, protective clothing and safety glasses should be worn. Cutting & Drilling Trex • For best results, use carbide tipped blades and router bits. Tsex Tip: Blades with fewer teeth (18-24 for 7 -1/4" circular sawblade) work best. • Trex workability is outstanding. Unlike wood, with Trex you won't need to be concerned about grain direction or knots. • When drilling large or deep holes, periodically lift the drill out of the hole to draw the shavings out. Gapping Trex • Width -to -width board gapping is essential for drainage as well as changes in dimension due to temperature. A gap of 1/8" will satisfy most installation conditions. • When joining Trex end -to -end, gapping is also required. "! size of the gap required will depend on the length of the boards, the temperature at the time of installation and the highest anticipated temperature in the local area. Ti-ex Tip: For 16' boards and smaller, allow 1/16" end gap for every 20 °F difference between installation temperature and the highest temperature expected during the year. Nailing & Fastening Trex • Hot- dipped galvanized or stainless steel nails or screws are highly recommended to take full advantage of Trex's durability. • More force is required to drive a nail into Trex than regular wood. Hold nail while hammering until it is driven 112" to 3/4 ". Hitting a nail with full force when it is not driven in may cause it to fly out. Nail guns work very well with Trex. For cold weather installations or when using wood screws or lag bolts, pre - drilling is recommended. Do not drill holes any larger than 3/4 of the screw /bolt diameter. Pre - drilling is generally not required for self- tapping or deck screws. Trex Tip: Most screws will cause Trex to "mushroom" up over the screw head — simply tap down with a hammer. Trex Color & Weathering Process • `Iiex starts out in varying shades of brown and weathers to a pleasant driftwood grey hue when exposed to sunlight and water — this is normal and does not harm the product. Trex Tip: You can speed the weathering process by periodically spraying water on Your deck with a garden hose. Decking this dwwble doesn't gnxv on trees. Wood - Polymer lumber Z00 in Sug aTnsuoD gDog ooag3ed b696 9£Z ZL6 Y63 0£ :01 agAA TO /6T/60 Trex Usage Guidelines (cont'd) Cleaning Trex • For stains caused by mold, mildew, berries and leaves, conventional deck washes containing detergent and sodium hypochlo- rite work well. For rust stains, ground in dirt and grime, use cleaners containing phospho- ric acid which are commonly available in home centers and hardware stores. • For tougher stains, such as oil or grease, scrub with a detergent containing a degreasing agent as soon as the stain occurs. Trex Tip: A light sanding with a fine sand- paper works well in removing grease stains that have been allowed to set. This area will then fade back to a driftwood grey hue. • Periodically clean out expansion gaps between Trex boards with a flat tool to ensure proper drainage. • When storing Trex at the job site, be sure to place on a flat surface. • To avoid warpage when stacking units, supports should start at each end and be spaced 24" on center. Supports should line up vertically. mm General Construction Facts • Trex is the first wood - polymer lumber to receive a listing with the National Evaluation Service, NER -508. The NES encompasses the three major buildings code agencies in the US: BOCA, SBCCI and ICBO. • Report NER -508 is available at your authorized Trex lumber dealer. Handling Trex • Trex is not intended for use as columns, • Trex weighs more than wood and it's more beams, joists, stringers, and other primary flexible. Special care should be taken when load bearing members. handling. Do not attempt to lift similar • Refer to the span chart below or NER -508 volumes of Trex as you do wood. for maximum allowable spans. Trex Decking Span Chart Maximum Recommended Center -to- Center Decking Spans (Trex fastened to a minimum of 3 joists) Tmx:_a� Deddng this durable doesnT grow on trees Wood - Polymer Lumber s0oQn Bug ITnsuo3 gaox ooagosd 6bJ6 5£Z ZL6 Xdd TE :OT GAM TO /6T/60 Residential Decks & Light Duty Docks Commercial Decks, Boardwalks & Marinas Playground Equipment r J /4 X 6r, 16" 12" 16 Residentialmay Care Only 2 „x4 „� 6,', 8 „ 20 �� 16” 16” Tmx:_a� Deddng this durable doesnT grow on trees Wood - Polymer Lumber s0oQn Bug ITnsuo3 gaox ooagosd 6bJ6 5£Z ZL6 Xdd TE :OT GAM TO /6T/60 me er 1 v • IA JL Al � Y •l r�r.ei '? 7Syiryr� E r �.' y T 6001j Zug ITnsuoD 430H 00ag0sd 6656 SU ZL6 IVA TE:OT QHM TO /6T/60 ;a e00 ln aug TTnSUOD g00g 000110nd 6696 M ZL6 YFd N: :OT GRA TO /61/60 900 ln eug TTnsnoj goog oDagz)ad b696 SU ZL6 XVA SE :OT Qd,M TO /61/60 Sug ITnSUOD WOM ODOgDud VM6 4£Z ZL6 IVA 8£ :OT Qd,M TO /6T/60 800Fn gud llnsuoD gaog ooagaud b656 5£Z ZG6 YVA OY :OT QdM 10/61/60 The adyantages of Trex: Ldeal dioice' c, of Msidertt l ndit 8. 'surrounds i ng;.wa� to ; Pat docks and more, t 4 \ wi 600 [8 Sug ITnsuoo yoog ooayoad 6656 4SZ Z66 X63 T6:OT Q9M 10/6T /60 for AOO@ "Xn attrac- e complement %Alnne{ n^o +o r �. ter yu cari'. a i::rady�- _ OTO[j Bud 2Tnsuoo gooH ooagosd VV96 5£Z ZL6 YE3 86:OT QdM TO /6T/60 W • s ' not ift._ ,qd o"- D p s, W as p3n,ot xill.proOde exoNent Ile from your TTex OTmatkm. t wofk best. TTO IM sug lInSUOD gDON ODDqund 6656 M ZL6 YV9 66 :01 Q3n1 TO/6T/60 CHANCE H E16i4DAL, s su 1Prts stems for... H^ 2 Sir .ivjr ♦ AA �.` �'g'+L- s.4 „{` rr rk dF k ¢ri 5 vrt � 7 { 6 ME 0 Yy I M 7 r 1 � � fir✓ rf f r I , r i Typical Walkway Hardware Application MI- POSt Rpil POST DECO JOIST PECK 0 LEDGER BEAT O OR SPREADER CARRIAGE OR NA:HINE BOLTS. NUTS ALB O WASHERS ANGLE TNINBLEYE B0.7(3). WT AND WINER I /E" DM W NINE BEAR SEAT SOLi3 IC . NUTS AND BRACKET HEIGHT WRBHERS IRE TRIRBLf OR OVRLEVE ABOV R OPE LW REGREW EVE BDLI(9) OI1A� HELICAL PIER CLIP9� SCREN INTO BERN) N NSw CONNECTION) eXT,Il CTION 1 IRE ROPE CLMEC 11IX1 pRA E I NtffR0. FptffO HELICAL PIER HEAD SECTION NO THE" 'C" FHCI'4N MD E %IENSIOHG FOR CR033 BHIRCE f- - - - - -- PIER SPM NOTE: Where applicable, hardware manufactured by A. B. Chance Company is made from steel produced in accordance with ASTM A5 and/or ASTM A576. When galvanized, items are manufactured in accordance with ASTM A153. Where appropriate, these hardware items comply to the following ANSI specifications: ANSI C135.1 C135.2 C135.22 C135.14 C135.17 ON THE COVER: Aerial view of a 1 -mile boardwalk constructed at a wetlands site for the Fairfax County, Virginia Park Authority. No wheel or track vehicles were allowed into the wetlands. The Helical Pier foundation anchors (Type SS5 — 0/2 "- square solid -steel shaft, i0 " -dia. helix, hot -dip glavanized) were installed to 7- and 10 -ft. depths with average above -grade reveal of 1 to 2 ft. Maximum reveal was 4 ft. 2 E10 in sug Tinsuoo 1430)1 030143sd VVS6 4E9 ZL6 S'c'd 86 :OT 0HA TO/61/60 DECK JOIST DECR O OR SPREADER 0 ]O Ca1Ri ANE OR =H'NE BOLTE. NRE A1ND 0.1P ANGLE B VN1�E BOLTED t0 FOR o MET OVAL OR TNINBLEYE BOLT. TOM OR NOT AND WASHER OF SIDE3 BIDES OF 1/2' DIA. MACHINE BOLLS. N"T" AND WTLSHERS BEAM MAT BIAC%EL YORE EOONi �ROWAE ROPE N- HELEC0. PIER CLIPS OIY MIRE AOVTER EXTENSION SECTION SECTION � vtRf ROPE \ � �DE PIER EXTENSION HELICAL PEER LEAD SECTION FOR CROSS BRACE HELICAL PIER LEAD FOR CROSS-BMCE PIER SPAN `L Rpil POST DECO JOIST PECK 0 LEDGER BEAT O OR SPREADER CARRIAGE OR NA:HINE BOLTS. NUTS ALB O WASHERS ANGLE TNINBLEYE B0.7(3). WT AND WINER I /E" DM W NINE BEAR SEAT SOLi3 IC . NUTS AND BRACKET HEIGHT WRBHERS IRE TRIRBLf OR OVRLEVE ABOV R OPE LW REGREW EVE BDLI(9) OI1A� HELICAL PIER CLIP9� SCREN INTO BERN) N NSw CONNECTION) eXT,Il CTION 1 IRE ROPE CLMEC 11IX1 pRA E I NtffR0. FptffO HELICAL PIER HEAD SECTION NO THE" 'C" FHCI'4N MD E %IENSIOHG FOR CR033 BHIRCE f- - - - - -- PIER SPM NOTE: Where applicable, hardware manufactured by A. B. Chance Company is made from steel produced in accordance with ASTM A5 and/or ASTM A576. When galvanized, items are manufactured in accordance with ASTM A153. Where appropriate, these hardware items comply to the following ANSI specifications: ANSI C135.1 C135.2 C135.22 C135.14 C135.17 ON THE COVER: Aerial view of a 1 -mile boardwalk constructed at a wetlands site for the Fairfax County, Virginia Park Authority. No wheel or track vehicles were allowed into the wetlands. The Helical Pier foundation anchors (Type SS5 — 0/2 "- square solid -steel shaft, i0 " -dia. helix, hot -dip glavanized) were installed to 7- and 10 -ft. depths with average above -grade reveal of 1 to 2 ft. Maximum reveal was 4 ft. 2 E10 in sug Tinsuoo 1430)1 030143sd VVS6 4E9 ZL6 S'c'd 86 :OT 0HA TO/61/60 Helical Pier® Anchors Walkway support system for Walkway Support A special Beam -Seat bracket employs a 12 %long steel pipe to Minimal disturbance, sleeve a lY2" SS Helical Pier. The bracket's 7Y2" -wide flanges Transfers loads to bearing capable strata, mount it to lateral support beams for joist and deck struc- Isolates structure from seasonal surfaces layer changes, tures. Flanges adjust to accept beams as wide as 3Y2 ". System Modular helical foundation and extension sections, advantages give it accessibility to sensitive wetland areas. Portable hand -held installing equipment. ORDERING INFORMATION Typical working torque 5500 ft. -lbs. — Ultimate tension strength 70,000 lbs. I L -shape beam bracket with matching plate allows beam size variations. The pipe type sleeve mounts on Helical - Pier° to accommo- date beams forjoist and deck structure Extension Guy Adapter LEAD SECTIONS Catalog No. Length Helix Combinations Std. Pkg./Pallet T110 -0676 7 ft. 8" 1120 T110 -0677 7 ft. 10" 1/20 T110 -0678 7 ft. 12" 1/20 P012642EJ 5 ft. 10" - 12" 1/20 P012642AEJ 7 ft. 8" - 10" - 12" 1/20 EXTENSIONS Catalog No. Nominal length Std. Pkg./Pallet 12655 3'/2 ft. 1/50 12656 5 ft. 1/50 12657 7 ft. 1/40 12658 10 ft. 1/30 Extensions with helices are available. Contact your Chance represen- tative for information. BEAM SEAT BRACKET Hole size for Y2" bolt. 10.000 lb. max. load compression only. Catalog No. Length Saddle Width Std. Pkg./Pallet' C110 -0682 12" 3 41148 GUY ADAPTERS Catalog No. Nominal length Description Std. Pkg./Pallet C102 -0023 18" Thimbleye 5/175 C102 -0024 18" Twineye 5/250 C102 -0025 18" Tripleye 5/250 C110 -0026 20" Threaded Stud 5/130 C110 -0041 18" Ovaleye 5/200 NO- WRENCH SCREW ANCHOR Catalog No. Tripleye Anchor Size Dia. Rod Dia. & Length Std. Pkg./ Pallet 6346 6" y4" x 66" 1 /100 816 8" 1" x 66" 1 /60 10146 10" 1Y,' x 66" 1/20 Typical working torque: '/4" Rod 400 ft. -lbs. 1" Rod 1000 ft. -lbs. lY4" Rod 2300 ft. -lbs. 3 VTOIA aug 1Tnsuoo goog oaagasd 6626 4£Z ZL6 XVA 6b :OT UHA 10/61/60 Lead Section BOLTS, CARRIAGE Carriage Bolts have square nuts, finished points and rolled threads. Standard heads have square shoul- ders. Open - hearth steel. Hot dip galvanized. Cat. No. Dim. in Inches pprox. Ship Wt. Lbs. Per 100 Pcs. Bolt Length Thread I Length '/e -Inch Diameter 8634 4 1 15.6 8634 4 1 17 8635 5 1 17.6 8636 6 j 1 21.6 8637 7 1 22 Cat. No. Dim. in Inches Approx. Ship Wt. Lbs. Per 100 Pcs. Bolt Length Thread Length '/2 -Inch Diameter 8644'/2 4'/2 3 32 8645 5 3 31 8645'12 5 3 37.5 8646 6 3 38 8647 7 4 44 4,250 Pound Rated Tensile Strength 7,800 Pound Rated Tensile Strength No. 8634 BOLTS, MACHINE Are also called crossarm bolts or through bolts. Bolts have rolled threads and one square nut. Bolts six inches or longer have cone -type points. Hot dip galvanized. ...11 1 0",.1. Ain r . l t Cat. No. Dim. in Inches Approx. Ship Wt. Lbs. Per 100 Pcs. Bolt Length Thread Length '/2 -Inch Diameter 8707 7 3 48 8708 8 4 49 8709 9 4 57 8710 10 4 60 8712 12 6 71 8714 14 6 73 7,800 Pound Rated Tensile Strength BOLTS, OVALEYE Bolts with 5 /e" and 3 /4" shanks have 1 x 2" ovaleyes. Drop- forged, galvanized steel bolts have cone type points and rolled threads. 1 /2 -Inch Shank Diameter' /ls" x 1 x 1 Ovaleye 29939 8 4 77 29943 12 6 100 7,800 Pound Rated Tensile Strength 4e" Shank DIa — -As x V12" x 2" Ovaleye 1 4" Shank Dig —'Is" x Ni x 2" Ovaleye 29956 Length 4 Approx 29958 Under Thread Ship Catalog Eye Le ngth Wt. Lbs. No. Inches Inches Per 100 Pcs. 1 /2 -Inch Shank Diameter' /ls" x 1 x 1 Ovaleye 29939 8 4 77 29943 12 6 100 7,800 Pound Rated Tensile Strength 4e" Shank DIa — -As x V12" x 2" Ovaleye 1 4" Shank Dig —'Is" x Ni x 2" Ovaleye 29956 Length 4 Approx, 29958 Under Thread Ship Catalog Eye Length Wt. Lbs. No 10 6 Per 100 Pcs. 1 /2 -Inch Shank Diameter' /ls" x 1 x 1 Ovaleye 29939 8 4 77 29943 12 6 100 7,800 Pound Rated Tensile Strength 4e" Shank DIa — -As x V12" x 2" Ovaleye 1 4" Shank Dig —'Is" x Ni x 2" Ovaleye 29956 6 4 100 29958 8 4 104 j 29959 9 4 113 29960 10 6 122 29962 12 6 144 29964 14 6 146 29966 16 6 168 29;R 68 18 6 208 j 2 20 6 240 29978 Type 4 180 29980 Dia. 4 200 29982 1' /e x 1'% 6 228 29984 Al22 6 248 29986 6 6 268 29988 6 314 18,350 Pound Rated Tensile Strength 12,400 Pound Rated Tensile Strength BOLTS, SCREW EYE Gimlet -point lag -screw thread. Drop- forged. Hot dip galvanized. Catalog No. Type Dimensions in Inches Approx. Ship Wt. Lbs. Per 100 Pieces Size of Eye Dia. Length Under Eye 29930 Ovaleye 1' /e x 1'% '/2 6 65 09931 Thimble y '/m x " /is 3 1 e 6 112 9 No. 29 No. 09931 No. 29930 S10In aug 1Tnsuoo goog 000tloed bb96 9EZ ZL6 XVA 09:OT QdM TO /6T/60 FT im BOLTS, THIMBLEYE® Contoured eye keeps guy strand from kinking, bending, or spreading. Drop- forged steel. Hot dip galvanized. Cone -type points. Eyes of angle bolts are offset 45 degrees. Catalog No. Size Inches Thread Length Inches Approx. Ship Wt. Lbs. Per 100 Pea. traight Bolt Angle Bolt 5510 5010 6 /6 x 10 4 148 5512 5012 6 /6 x 12 6 176 5514 5014 1 6 /6 x 14 6 1 188 5516 1 5016 1 6 /s x 16 1 6 192 12,400 Pound Rated Tensile Strength Angle Bolt CLIPS, WIRE ROPE GUY WIRE Body of each clip is cast steel designed to fit the strand, which is protected by smooth- rounded contact surfaces. Bolts are made of high - strength steel. Catalog No. Size of Strand, In. Approx. Ship. Wt. Lbs. Per 100 Pea. 6480 4d 12.5 6481 6 /16 13.5 6482 -/a 22.5 6484 1 /2 56.3 6485 6 /8 111 ROUND WASHERS Catalog No. DimensiokInches Approx. Ship Wt. Lbs. Per 100 Pieces Washer Size Bolt Dia. 6811 1 O.D. x 14 Ga. 6 /16 6/6 1.64 6802 1%4 O.D. x 14 Ga. " /,e s/e 2.84 6803 1/6 O.D. x 12 Ga. "!1e /2 4.b0 1' /4 O.D. x 12 Ga. 6 /6 8.50 2 O.D. x 9 Ga. '/. 11.80 SQUARE WASHERS Catalog No. Dimensions in Inches Approx. Ship Wt. Lbs. Per 100 Pieces Washer Size Hole Dia. Bolt Dia. 6811 2 x 2 x %6 6 /16 1 /2 13 6812 2 x 2 x %6 " /,e 6/6 12 6813 2'/. x 2'/. x /i6 "!1e 6/6 24 CLIP ANGLE Catalog No. Dimensions P102 -0333 3 %' x 5" x 6 e' x 3%' long hole, to accept 1 /4" bolt" B � E -1 i F D 1 I � \ C A Dimensions in Inches A B C D E R 6 /8 V/8 a /16 "/16 No. 6485 Clip Angle i - Square Straight Bolt Round 5 9 T0[] SuH TTnsuoD gaoH oaagasd bb96 5£Z ZZ6 YVA OS :OT QH,M TO /6T/60 WASHERS Galvanized Portable Anchor Installers for small foundations • 2,500 ft. -lb. torque capacity hydraulic power drive Manual- operated portability for economy, remote sites, common anchor installations For most shaft - driven guy anchors and smaller helical foun- dations, these compact drivers get into areas where large equipment cannot go or is impractical. Operator does not need to resist the torque generated by anchor installation. Countertorque transmits through a torque bar from the drive head to the earth or other restraint. This frees the operator to the task of guiding the anchor path. For a heavy -duty, portable Hydraulic Power unit also avail- able, see next page. See next page for Ordering Information. C3O3 -1032 Hydraulic Anchor Driver requires 1550 PSI at 8 gpm flow rate to deliver 2,500 ft. -lb. maximum torque. Built -in bypass valve lim- its output to 2,500 - ft. -lb. maximum, two -way foot pedal gives operator direct control over drive and re- verse directions, hoses ( two 12 -ft. and two 25 -ft.) come with quick couplers for all connections from powersupply to footcontrol todrive head. Pivoting drive - head yoke con- nects with bent -arm pin to square - tubular torque bar which telescopes from 8 feet to 10 feet as needed. C303 -1244 Hydraulic Anchor Driver requires 1,900 PSI at 8 gpm flow rate to deliver 2,500 ft. -lb. maximum torque. Fora heavy -duty, portable Hydraulic Power Unit also avail- able, see below. R Optional Hydraulic Power Unit (Catalog No. C303- 1201): For easy wheeling to worksite, hydraulic drive head and foot control secure by rubber strap included to angle braces atop the cart frame and hoses ride on handles. Cart- mounted on 5 /e "- diameter axle with two 4.80 x 6 Inflatable (30ps1) tires; 27 1 /4" wide x 34 1 /2" high x 36" long; shipping weight with oil: 275 lb. Hydraulic Pump with fan cooling system: Typical output pressure 2500psi Pump displacement 8gpm @ 3400rpm Reservoir capacity 5 gallons US (shipping cap and vented fill cap provided) Gasoline Engine System: 16hp Briggs & Stratton IndustriallCommercial Model 326437, Type 2527 12 -Volt pushbutton start, 3600rpm (maximum) Operating instructions are included with anchor installer and hydraulic power unit. LTO In aug Tlns1100 gaog oaagaud bb56 4EZ ZL6 YVA T9 :0T GAA 10/61/60 Portable Anchor Uistallers for small foundations Ordering Information Hydraulic — 2500 ft.-lb. capacity — Catalog No. C303 -1032 Grease filled gear case. Single Catalog Number above includes all items below. Each item also may be ordered by separate number. * Hydraulic Control Valve C303 -1031 Two 25 -ft. Hydraulic Hoses C417- 6121(each) * Hydraulic Drive Head C303 -1180 Yoke Assembly E303 -0680 * Two 12 -ft. Hydraulic Hoses E303 -0876 (pair) Square Torque Bar Ass'y. E303 -1041 * Output shaft is 1.5 inch square socket. Requires C303 -1230 (not included) to install anchors other than 1.5 inch square shaft. Note: Hydraulic components are not interchangeable between C303 -1032 and C303 -1244 Hydraulic — 2500 ft. -Ib. capacity — Catalog No. C303 -1244 Sealed oil - filled gear case. Single Catalog Number above includes all items below. Each item also may be ordered by separate number. * Hydraulic Control Valve C303 -1247 Two 25 -ft. Hydraulic Hoses C417 -6121 (each) * Hydraulic Drive Head C303 -1233 Yoke Assembly E303 -0680 * Two 12 -ft. Hydraulic Hoses E303 -1253 Square Torque Bar Ass'y. E303 -1041 * Output Shaft is 2 inch Hex. -Requires Kelly Bar Adapter P630013 (not included) Note: Hydraulic components are not interchangeable between C303 -1032 and C303 -1244 Foundation -Tools Recommendations Either installer has output flange with six -hole 5 1 /4" bolt- circle to connect to drive tools shown below. required for each particular anchor and local soil conditions determine the appropriate power installer to use. Tool E303 -0255 Tool 639001 Tool 639000 Tool C130 -0010 Tool C303 -0737 Tool C303 -1230 ix I V 4P 4 0 e lf for No- Wrench Anchors for for for for for to 1 1 /4" dia. 1' /2 "SS & 1' /4 "RR Square -Drive Flange -Drive Bumper Posts Catalog C303 -1032 to (Cat. Sec. 4) & Type GP Anchors Type LD Foundations "Pad -Pod" (Catalog Page 46 -8.1) adapt to Foundations (Cat. Sec. 4) Foundations 5'/4" Bolt Circle using temporary eyenut To drive wrench -type anchors with these portable installers, consult factory. 7 8T0[n eug TTnsuoo goog ooagosd 61 9U ZL6 ANA Z2:0T (MA TO /6T/60 Ilk I i 4i 1 On' ; of HELICAL- 1 r 1 B R Rl L \ M f i ♦ , Or oft ���� -� 63n 1Y •., -i iv .k•-'� n.,-- I '�' �� �— .'dam"' . = ' y ✓''►�!�" F � T " #rt Ilk I i 4i 1 On' ; of