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<br />XN-i GENERAL
<br />The ConbOttor accepts full responsibility for proper hording
<br />and installation at the fibergims udergrourd stooge Mks &
<br />shol k"we that good wakmaishp, practices and construction
<br />Procedres as felbwed during the handing ad isfic on of
<br />the torks, regardless d the inclusion a amrstiw of of
<br />oppicobk suggestion in these isWctiom
<br />Urtno,m stuotiom or cord Ea" mol covered herein are to
<br />responsibility of he controcbr. MaxAoclurx'f specidisls
<br />and M Sus/ enginew are both ovotable for consultation. The
<br />presence of o monvtoctrer or Shell obsRver d on installation
<br />it* does Ind relive the contractor of this responsibility for
<br />proper installation on to toi
<br />Fibwgksss underground tanks must be nottalled according to
<br />Mse instructions and NFPA 30 ad 31. Local codes may oppy
<br />wd should be consfted Failure to fdtaa Mss insfolotion
<br />instruction" with raid M saronty ad mgr resull in Iorex
<br />failure. Proper kMdbtion of 6bergtms udogrwd bats
<br />helps to prevent fork domoge and to Imre tag term corrosion
<br />resistant service. 8 is knperotive to read, anderstond ad
<br />Idfo. M Instructions beta..
<br />Fawgloss underground larks require the backfin moterioi to
<br />provide as much a 904 of M tock support under cerldn dress
<br />conciliate, The rataknq caAroclor must be positive he has
<br />the correct bed and tockfil and Iolors Mse instruction
<br />exocty.
<br />The co*octor is responsol, to know and campy with applicable
<br />sectionof "OSHA Constation Standards', 29 CFR 1926, Subport
<br />P --EKowta"" (with ole Appendces) which cover the
<br />piertinwnl general tad specific safety regirilmfnts
<br />Or dowings do mol and cannot depict all the various; soil
<br />comiLor" which tend to govern to opprepriote meas to use to
<br />provde sde raking conditions witNn on excavation for under
<br />grout tacks. The OSHA standards are very specific on benching,
<br />shoring, ad Open excavation standards.
<br />TNrs are sererol mems avoikble to SNIT ad the General
<br />Galtrociar 1 achieve canpkonce rod, mass importantly. to
<br />provide sale working cordborm The SNIT Engineer will
<br />Selecl M mal opprogriate oral cost effective method to be
<br />used from one of M following approved options. The method
<br />chosen will be rated in M "Addenda" section of these
<br />specifications or checked on beide ane of M following
<br />alternatives:
<br />I. Peoq" bockfill with appropriate sloping d sidevdls
<br />to the ogle d repose
<br />Revised Drawing AR -83020 depicts appropriate excovaCon
<br />of "age sail condition". so that an installation crew
<br />navy eller M vxcooeon Is grade M tort bed and complete
<br />M ude bre cornpation work: The 1:1 cope depicted
<br />could be more Of less depending on octud sell condtiorm
<br />This option demonds o much larger excavation at grode, ren
<br />though M add6tiarrol moterid to be excavated and replaced
<br />may be only 100-200 cubic yards.
<br />2. Salo backfil with voter compaction
<br />Urobl further mitten roUc4 from Rood Office Worketing
<br />Enginwirsq, no sad instalktions are b be otternpted.
<br />Arry sweep bons must have prior Marketing Engineering
<br />wpry al.
<br />3. Shoring of M lark We wells
<br />Tri; method may be rewired at bores in ander to protect
<br />4xist' I sbuctwss during fomite remod and rpkscernent or
<br />to" M size d M secovation on small properties.
<br />FOR ADDITIONAL INFORMATION
<br />gr4stioro regarding irstwill procedures or tonk repairs
<br />sWA be drKled to M Shed tr,gineer.
<br />XN-2 PRE-NSTALLAPON
<br />I. CONTRACTOR ACCEPTANCE/INSPECXN OF TANKS
<br />Snell's oppreved standord is a doubleveii, ckohcl-
<br />Compotibe fibaglo s tate. The installing contractor
<br />snail meet to ki oelivary w site cnd olneaf the Mks.
<br />Prior to ur#aodirq, inspect for possible damage. Notify
<br />SNIT snginssr immediately it arty is fwd.
<br />2. TESTING
<br />BEFORE PERFORMING ANY AR TESTS ON A DOUBLEWALL
<br />TANK, THE CONTRACTOR is EXPECTED M READ AND
<br />Itt"OUGHLY UNOERSTANO THE TANK MANUFACTURERS
<br />INSTRUCTIONS FOR THE PROPER HANOLING AND TESTING
<br />PROCEDURES TO BE USED.
<br />NEVER PERFORM AN AR PRESSURE TEST ON THE ANNULAR
<br />CANTY SPACE (INTERSTICE) OF A DOUBLEWALL TANK AFTER
<br />THAT INTERSTICE HAS BEEN FILLED WITH LXyUW.
<br />WItETHER AT THE FACTORY OR ON THE ADOSITE, THE TANK
<br />INTERSTICE MAY BE LIQUID FILLED ONLY BY A FACTORY
<br />TRAINED & EOUIPPED CREW, NOT ME INSTALLATION
<br />CONTRACTOR. THIS CREW WILL ALSO PERFORM A LIQUID
<br />HYDROSTATIC PRECz510N TEST ONCE BACKFILL S Use TO
<br />THE TOP OF THE TANKS. THIS HYDROSTATIC TEST DOES
<br />NOT REPLACE THE PRE -INSTALLATION AR/SOAP TEST,
<br />AS Mks must be vented since Mks we disigred fa
<br />operatim at atmospheric pressure shy. Plugs ad drop
<br />Ube 6ttinrp are not dghltned at to pkrd b Blow for
<br />temperature changes drug sh,pmer.
<br />For tarts shipped with interstice dreody Med nth
<br />liquid at Me factory, DELETE to pre-instdloUon air od
<br />soap test
<br />Fa Mks skipped with dry mtersbces, the contracts ,s
<br />responsible for making an cerostok leokoge lest at a
<br />Pressure not exceeding 5 pi prior to setDng tart. Test
<br />b be conducted kr a minvrlum of one hour .itrout o
<br />measurable loss of Pressure. Use a pressure gouge with
<br />full scats Of not move than 15 psi. Isolate tanks from
<br />piping when pressure les6'ng AM piping. Do rot opprooch
<br />ends Of Mks or moreroyS the are ceder test. Tacks under
<br />prtsus shad not be left unotlerded.
<br />Whole tonk is under pressure, the entire lode, including
<br />fittings, should be wetted with o ""y sdulion to
<br />Inspect for minor looks which oUxrnm might mol be
<br />evident. A garden tate-type sproyer with "Sean Test
<br />Sok*M' mwv/ocMM by WWAon PFCdQCtL Choi
<br />Nath Caokres, is recorrmerded fa Chs purpose. An
<br />dernate occeptoble solution would be me (1) cup of
<br />dishwashing detergent such as Dove or hay Liquid in o
<br />gallon of water.
<br />If Mks are dropped or impaled after initial te><
<br />(411 lakS and soap or" of impod to check for tank
<br />dom". If domoge hos occurred• do not attempt repairs.
<br />Contest M Shell engineer.
<br />Preswriri to reloirey smell onnulor space (see
<br />chat below) between the two tank Shells can occur very
<br />quickly. A pressure of over 5 psig may cause danoge to
<br />to tore structure which may not be immed'atey apporent
<br />Fa am such tests an ole gouge (nth maornvn 1/2 Ported
<br />increments should be used (maximum fou gage pressure
<br />15 psig). The Mk monxfaclurer provides a valve end
<br />manifold arongement to perform this test.
<br />Folow the steps as outlined in the tank manufacturer's
<br />insbtatiaf and testing 'instructions ad come with every
<br />Mk shipment. It is mandatory that M air supply line
<br />NEVER be connected to M annulor cwiy access filing.
<br />TN ini noin tont, may be pressurized directly by on dr
<br />compressor, but always use to morrfold provided by the
<br />fork manufocbrer to pressurize M amulor cavity.
<br />N lest results and selected installation data are to be
<br />recorded on Shell's "DoWk.cil Instalfoti'on/Irspectim
<br />Procedre and Checklist". A complete copy of this form
<br />must be retuned to are Shell engineer with a -built
<br />drawings (or 35mm color pictures) and M finol invoice.
<br />FALURE TO FURNISH AN ACCEPTABLY COMPLETED COPY OF THIS
<br />FORM WILL RESULT, IN SHELL WITHHOLDING FINAL PAYMENT.
<br />3. HANDLING
<br />Double wall tanks are approximately twice as Novy as
<br />Conventional single wall tanks (see chart below) anal cannot
<br />be diver unloaded. The instolo5on contractor wit be
<br />required to urood M kirks at M job ile. two lifting
<br />kgs at provided on 8, 10. and 12 thousand golon tanks.
<br />At oder precoutions fa handling these Mks are the same
<br />as for single wall krks
<br />SIZE
<br />WGT
<br />lbs
<br />ACT. CAP.
<br />tong
<br />ROi ANNULAR VOL.
<br />tons Cubic feel
<br />550
<br />650
<br />S48
<br />50 / 7
<br />1000
<br />950
<br />971
<br />100 / 13
<br />8000
<br />4400
<br />7830
<br />540 / 72
<br />IDODO
<br />5500
<br />9730
<br />620 / 83
<br />12000
<br />7000
<br />116M
<br />7DO 94
<br />Gage charts for Oocblevdl talks are identical to
<br />siafewoll lark charts ince M inner. ton* le mode on the
<br />sal tooling as ingle.oe Mks.
<br />4. CHOCKK
<br />Tonks Todd not be bopped, rolled, or impaled. Chock
<br />M Mks untA ready la irdldlaUm and be Mm down if
<br />high winds are expected. Use a minimum 1/2" diameter nryM
<br />a hemp rope over each tank and tie to wooden stakes of
<br />odequale size to prevent IN lutea tan being moved by high
<br />winds.
<br />5. LIFTING
<br />Use 'i nstelkl lift lug(s) to Iift fork. On 15,000
<br />golon tanks, use spreader bar to Inure Iift angle of at
<br />leod 45 degrees at each lift lug. Guide the tank with
<br />gurideknes. Do not use chains or cooks around Mks. If
<br />tanks have to be moved (do not rail), set on smooth ground,
<br />free at rocks and foreign objects, and recheck. Capacity
<br />of lifting equipment must be Checked before kslollotion.
<br />6. TANK OPENINGS
<br />Torte openings shall remain closed, but tanks must be vented
<br />during handing and up to the lime when pipe connections
<br />are mode to prevent the intrusion of voter ond/or foreign
<br />matter. AA unused op6n93 are to be property Sealed with
<br />plugs per davirgs when piping is being instolled.
<br />7. CONTAINMENT MONITORING SYSTEMS
<br />For doubkvd Mks a liquid Nod -pressure look detector
<br />system (NO EXCEPT)ONS) will be furnished by Shell. Fa all
<br />other containment vo4wrei, a liquid -intrusion leak detector
<br />system will be furnished by Shell. Where necessiloled by
<br />code or desired by Shell, preswriled product piping may be
<br />Mier protected by a continuous pressure leak detector
<br />system Furnished by Shell. See opplicable ShNI drowings
<br />fa ir"tdtaton details
<br />XN-3 BED AND BACKFILL MATERIAL
<br />I. GRAVEL
<br />Slandad bed and bockAl material should be a naturally
<br />rounded oggregate, clean and free -fowl with particle
<br />size not less than 1/8" or more trop 3/4" in daneter.
<br />Um ars description when specifying or ordering because
<br />materia is known by dflerenl manes in Clffe"t ores.
<br />This material is commonly called pea gravel.
<br />A
<br />2. STONE OR GRAVEL CRUSHIN(S
<br />Slane orgravel crush'ngs with angular particle ire not
<br />Ilse: than 1/8"_or more than 1/2" in diameter, washed and
<br />Iree-floiing, is acceptable w an alternate malerid. This
<br />material must meet ASTM C-33 Porogroph 9.1 regirtmonts
<br />for quality and soundness.
<br />Caution: In freezing conditions, bockfill must be dry and
<br />free of ice. Do not we other backfill materiels. In
<br />orem where specified materials we not available, conlal
<br />Ow Shell engineer for instructions.
<br />Do mol allow boc1u611 materid to intermix with ay
<br />excavated sal at the site. It this should occur,
<br />mechanical canpoctim of the bockfill will be required.
<br />The minimum particle size of 1/8" (No. 6 sero) is
<br />critical fa 'sell-compoc5ng" backfil.
<br />XN-4 HOLE SIZE, BURIAL DEPTH AND COVER
<br />The conboclor will be responsible lar compliance with OSHA
<br />"Construction, Safety & Health Requkstior",' Subpart P -
<br />Excavations, sections 1926,650 trough 1926.652.
<br />1. STABLE WALLS
<br />Stable wells are tole which namely con be made vertical
<br />from bed to grode without use of shoring or ell"t piing
<br />because of naturol cotwsive soils with an unconfined
<br />compressive strength of 1.5 Ms/square root, a more.
<br />Hale must be forge enough to allow a minimum Of 24"
<br />between lonks at ribs and a minimum of 24" from ends od
<br />sides of Mks to We rolls.
<br />2. UNSTABLE WALLS
<br />Those with $[tele having less than 0.5 tons/sq 8 cohesion
<br />m calculated from on unconfined compression test Hole
<br />must be large Bough to allow minimum of 1/2 M Mk
<br />domeler from ends and ides of tanks to We walls. A
<br />qualified sail testing bbootory can provide data and
<br />recommendations.
<br />3. HOLE DEPTH -
<br />Burial we must be deep enough to alloy 0 minimum of 12--
<br />bockfill
<br />2"backfill bed over the hole bottom or concrete slab. Tanks
<br />should have a minimum cover depth of V-5", including 8" d
<br />rvrdIwced concrete mal.
<br />4. MAXIMUM BURIAL DEPTH
<br />Depth of cover for tanks of 10' or less in diameter in
<br />both traffic and non-troffK Conditions must not exceed
<br />7 -0" -over for* lop (including concrete slob).
<br />5. PAD DIMENSIONS
<br />Reinforced concrete slab must extend at li 24" beyond
<br />lark outline in of directions, as a single slob. Provide
<br />3/4" thick exponsion joint all around slob for 0 3 -fork
<br />system. $too to be 8" thick with 6" x 6". 4/4 welded sire
<br />fabric. A 3 -lark sloes will be cost with two longtudnd
<br />construction tones, keyed and dowNisO. Do"s
<br />to be 14 deformed round steel bas 30" long and placed
<br />opproximotely 48" on center in M center d to slob.
<br />Place on 8 mil pdyethylent barrier over completed
<br />backfill before pouring the slob.
<br />XN-5 ROCK AND WATER
<br />Where a rock ledge or uncontrollable voter con6tion is
<br />encountered in M course of excavation, M Contractorshill
<br />advise the Shell engineer immedately od not proceed with M
<br />excavation until o determination and agreement is mode as to M
<br />handing of this work and the anchorage of tanks. San sloe
<br />or boulders sneller than t-1/2 cu. M. taut con be removed or
<br />handled by a power shovel shot be considered a pal of M
<br />excavation contract and will not be considered a rock ledge.
<br />Conbator shell do all dewoterirg and pumping required to
<br />remove accumulations of surface water from excavated seas of
<br />no oddtiond cost. Underground seepoge that cm be controlled
<br />with a single two inch diameter construction pump wall not
<br />warrant an extra charge for pumping. 11 odditiorol pumping
<br />equipment, well pointing, or shee0ng becomes necessary, M
<br />contractor snail immedotely rody Shell regarding M problem,
<br />with recommendations fa handling and on estimated extra cost
<br />to complete M wok with opprograte urn prices for material,
<br />labor and equipment
<br />XN-6 INSTALLATION PROCEDURE - CRY HOLE
<br />Anchoring is recommended in eery, or if high water look exists,
<br />or if water problems couW develop often fork is installed.
<br />(See "Float -al", Section 12).
<br />I. BED
<br />Bakfdl bed under tones should be a minimum of 12' tNtk
<br />ever M We bottom a concrete slob, if used. Bed should
<br />be sloped between 2" and 4" toward the 611 at end of tank
<br />unless center 611 is used. and in which core bed shaAd
<br />be level. Setting of screeds is recommended for inswing
<br />smooth, property pitched beds. Place tanks in We on bed,
<br />after screeds have been removed. Do not pace forks on
<br />Umbers, beams or erodtes.
<br />2. HIGH WATER
<br />Tanks, whether stropped or rot• must never be left on the
<br />bed without bockfill to M top of lark if tore is ary
<br />Chance of more than 12" of water in the Mls. (See
<br />"Fbul-out', Section 12).
<br />3. BACKFILLING It
<br />Use to some materials as, initial bedding. A M stat of
<br />backfilling cue must be token to push bockfill material
<br />completely beneath lark bottom, between ribs omd under that
<br />cops to provide necessary support. A tong hurdled probe,
<br />or similor device, shaAd be used to push bakfit oder
<br />M Wink since yeo grovel or stone crashings will not flow,
<br />into this ores (see installation drawing AR -83020). Good
<br />compoction em also be obtained by slicing the grovel with
<br />o shovel all around the perimeter of each tank. Install
<br />M first 12" of backfill In two 6" layers
<br />Unanchored Mks installed with backfill to ane top of to
<br />fort but without backfill to grade shah be fulled with
<br />product or woke as ballast Do mt odd ballast in lank
<br />before bockfill material 'c even with top el lar*.
<br />Complete backfilling to too of lank. Be we bockfill
<br />is kw of barge rocks. debris or beigrh moleriah that
<br />could damage to tort. Avoid impocting tanks fixing
<br />bockfillirg.
<br />Nlenpt to minimize time Conti employees are in the
<br />lank hale. When men we in the hole, superrisers must be
<br />present on top. Cave=ro as a donger during irsldlation.
<br />Use of precaution when men are in to hale, paticulary
<br />the edges below tohk We oval ad the Mk.
<br />7��3SR9:.eiL4Iw�4
<br />Excavation sWAd be brought to grode with pea gravel or
<br />SMe or gravel crushings meeting the specifications shown
<br />in Section XN-3, as used fa bedding ad bockfilfrg. Do
<br />not mix materials.
<br />Coutac Bricks or blacks used b support piping must be
<br />removed pilar to filling b flligrode. Do not use rock, stole,
<br />debris, or " excavated mated lex fill.
<br />5. BARRICADES
<br />TwA areas must be barkoded 1 prevent a6' vehicle trovet
<br />~ to tales until o cured concrete slob exstS See
<br />Section XN-4, burial depth ad cover/traffic loads.
<br />Berms shoed be istdled aaud the perimeter of M took
<br />hale to prevent groundwater from riming into hole during
<br />ConstrKbon
<br />XN-7 INSTALLATION PROCEDURE - WET HOLE
<br />Anchoring is mandatory,
<br />1. WATER LEVEL
<br />Water level should be maintained at the lowest procticd
<br />level during installation. A sump and pump or a system
<br />d well points and pumps is M recommended method to
<br />minimize water lewd in M We. The type of system
<br />required will depend on water flow role into the We.
<br />The hose bottom should be level, free d rocks oat debris
<br />and covered with W least 12" of ba:kfill materid. (See
<br />Section XN-16, "Permon" Pipe Setups").
<br />2. BALLAST
<br />Place Mks In the hale, odbng only enough ballast to
<br />sink Mm. Dullest level in tanks must haver exceed voter
<br />level in holt Bring installation, White offing bouasl
<br />use only liming cable to keep Inks in position. Talcs
<br />should be free 1 roll slightly. The lifting cable must
<br />corefully tended.
<br />Caution: Do nal place tanks an timbers, beams or crodes.
<br />3. LEVEL TANKS
<br />"wrog forks, shave tat minimum pocinq bthwien
<br />barks is malno6val. When anchoring, place straps oro
<br />lcrks and follow Procedures in Section XIV -8.
<br />4. BACKFILLING
<br />Distribute bockfill every orwnd tonks as Continue
<br />procedures Coined for dry We instadotion.
<br />I RNE 6C TNI-El2,)i-ATE 5
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