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Deadmen should be installed along the center line of anchor
<br />points, taking care to have good cross alignment tl" with
<br />adjacent deadman mothers. The two outer anchor points should
<br />be used for lowering deadmea into the tank hole. If the
<br />contractor elects to cast deadmeo in place in the hole, the
<br />same anchor* should be used with equal reinforcement.
<br />Any other substitute method will require equal horixontal
<br />area, anchor points of equal strength to the wire rope
<br />required, and approval of the Shell engineer.
<br />4. CHANCE ANCHORS
<br />Chance anchor@ can be used to anchor tanks. Size, number and
<br />type vary with soil conditions which must be determined.
<br />Attach anchors to straps with wire cable and clamp. Do not
<br />use without determining holding strength of actual coil for
<br />this method.
<br />Anchoring system design must be capable of resisting stress
<br />shown in the table below.
<br />5. ALL ANCHOR METHODS
<br />Minimums Per Anchor Location.
<br />TANK DIAMETER 6' OR LESS B' 10'
<br />Wire Rope (Recommend
<br />6 x 19 plow steel)
<br />Diameter 3/8" 1/2" 1/2"
<br />Tensile St. 9,000 12,500 16,000
<br />Turnbuckle Diameter
<br />Hook Type 3/4" 1-1/4" 1-1/4"
<br />Eye Type 1/2" 1/2" 3/4"
<br />XIV -9 SOIL STABILIZATION/FILTER FABRIC EXCAVATION LINER
<br />Soil stabilization/filter fabric as specified below will be used
<br />to line the bottom and side walls of all excavations for fiber-
<br />glass tanks except those in solid rock. For purposes of this
<br />specification, solid rock will include igneous rocks (granite,
<br />etc.), sedimentary rocks (conglomerates, sandstone, shale,
<br />limestone, etc.), and metame rphic rocks (gnieses, schists, slates,
<br />etc.).
<br />If only a portion of the hole is excavated from solid rock, then
<br />only that portion, which is not, should be lined. (For instance:
<br />If only the bottom foot or so of the excavation is in solid rock,
<br />then the sidevalls should be draped with the fabric so as to
<br />overlap into the rock area.)
<br />There are several inexpensive inert soil stabilization filter
<br />fabrics available which provide a separation between existing soil
<br />and compatible backfills. When this material is used, the 1/2
<br />diameter tank spacing from ends and sides of tanks to hole walls
<br />is not required.
<br />DuPont "TYPAR" spunbonded polypropylene Style 3401 - 4 oz/sq yd
<br />fabric or approved equal may be used. Ibis material comes in.
<br />rolls of 100, 300, and 1,000 yards in 12'-7" and 15'-7" widths.
<br />(Other manufacturers may vary.) Material should be laid with
<br />minimum laps of approximately 2' width so that the excavation is
<br />completely lined and overlaying the top of the hole perimeter one
<br />to two feet and pinned in place. See the drawing for a suggested
<br />layout method of utilizing the 15'-7" wide material.
<br />CONCRETE _SLAB ALTERNATE
<br />In situations involving extremely low bearing soil and adverse
<br />water conditions, a concrete slab under the tanks may be used as
<br />an alternate to the filter fabric method. Install prefabricated
<br />reinforced concrete deadmen as outlined in Section 9. Between the
<br />deadmen, under each tank area, construct a reinforced concrete
<br />slab with a minimum thickness of 6" reinforced with 6" x 6 06 wire
<br />mesh.
<br />P
<br />If contractor elects to cast a single slab, including the tank
<br />anchors, the slab should be deepened to provide the same cross
<br />section area as provided by the deadmen, and install the acme
<br />steel reinforcement and anchor points.
<br />If a concrete slab is used under the tanks, the filter fabric
<br />should be used as well to line the walls of the excavated ares.
<br />XIV -10 BALLASTING
<br />When ballasting of fiberglass tanks to required, water or product
<br />may be used and ballasting done in strict compliance with these
<br />specifications. Prior to delivery of Shell gasoline, the
<br />following items should be taken into consideration by the
<br />contractor:
<br />Forty-eight hours notice to plant is required for delivery of
<br />product for ballast.
<br />Assure proper access to site for delivery vehicle and advise Shell
<br />engineer of hose requirement needed to make delivery.
<br />A Shell representative will be on hand to verify and accept
<br />delivery and custody of product for the district. Upon completion
<br />of delivery, contractor and Shell representative should jointly
<br />verify the quantity of product delivered. At this time, suitable
<br />locks will be provided by Shell to secure fill caps.
<br />XIV -11 CHECK TANK DIAMETER FOR PROPER INSTALLATION
<br />Normal installation with specification pea gravel, and tank
<br />properly bedded, will normally result in a decrease in the
<br />vertical diameter of an 8' diameter tank of approximately I
<br />percent of I" at the fitting nearest the center of the tank.
<br />While a 2% deflection is within deflection design tolerance, IX is
<br />considered to be the maximum acceptable. Should the deflection
<br />exceed this limit, it is an indication that proper compaction has
<br />not been achieved. The pea gravel may contain fines below
<br />specification and some mechanical compaction by vibration may be
<br />required for consolidation of the backfill.
<br />Rater to Exhibit "B" for procedures for entering now fiberglass (A)
<br />tanks.
<br />See chart below for Owens-Corning G -Serine guidelines for minimum/
<br />maximum vertical, horizontal and bottom flatness measurements.
<br />INSTALLATION CHECKLIST AND INTERNAL INSPECTION FORM
<br />I A completed "Installation Checklist and Internal Inspection" form
<br />is to be provided the Shell Engineer for approval on completion of
<br />the tank installation.
<br />G-6 TANKS
<br />All sizes - (6-12M)
<br />1 2 3 4
<br />r4' 1/3 1/3 1/3 4'
<br />Manufactured I.D.
<br />Vertical i Norisontal Min.
<br />Max.
<br />Manufactured Bottom Flat - Max.
<br />Mia.
<br />G-3 TANKS
<br />G-3" 12M
<br />Manufactured I.D.
<br />Vertical L Horizontal Min.
<br />Max.
<br />Manufactured Bottom Flat Max.
<br />Min.
<br />G-3 IOM
<br />Manufactured I.D.
<br />Vertical & Horizontal Min.
<br />Max.
<br />Manufactured Bottom Flat Max.
<br />Min.
<br />G-:3 8M
<br />Manufactured I.D.
<br />Veirtical 6 Horizontal His.
<br />He=.
<br />Manufactured Bottom Flat Max.
<br />Min.
<br />G-:3 6M
<br />Manufactured I.D.
<br />Vertical L Horizontal Min.
<br />Max.
<br />Manufactured Bottom Flat Max.
<br />Min.
<br />92
<br />92
<br />92
<br />92
<br />90 3/4
<br />90 3/4
<br />90 3/4
<br />90 3/4
<br />93 1/4
<br />93 1/4
<br />93 1/4
<br />93 1/4
<br />13/16
<br />15/16
<br />15/16
<br />13/16
<br />3/4
<br />3/4
<br />3/4
<br />3/4
<br />90
<br />91 1/4
<br />91 1/4
<br />90
<br />68' 3/4
<br />90
<br />90
<br />a6 3/4
<br />91 1/4
<br />92 1/2
<br />92 1/2
<br />91 1/4
<br />15/16
<br />15/16
<br />15/16
<br />15/16
<br />3/4
<br />3/4
<br />3/4
<br />3/4
<br />90
<br />90 1/8
<br />91 1/6
<br />90
<br />88 3/4
<br />89 7/8
<br />69 7/6
<br />83 /4
<br />91 1/4
<br />92 3/8
<br />92 3/8
<br />91 i'/4
<br />15/16
<br />15/16
<br />15/16
<br />15/16
<br />3/4
<br />3/4
<br />3/4
<br />3/4
<br />90
<br />90 7/8
<br />90 7/8
<br />90
<br />66 3/4
<br />89 3/8
<br />89 3/8
<br />88 3/4
<br />91 1/4
<br />92 1/8
<br />92 1/3
<br />91 1/4
<br />15/16
<br />15/16
<br />15/16
<br />15/16
<br />3/4
<br />3/4
<br />3/4
<br />3/4
<br />90
<br />90 3/4
<br />92
<br />92 1/2
<br />88 3/4
<br />89 1/2
<br />90 3/4
<br />91 1/4
<br />91 1/4
<br />92
<br />93 1/4
<br />93 3/4
<br />15/16
<br />15/16
<br />15/16
<br />15/16
<br />3/4
<br />3/4
<br />3/4
<br />3/4
<br />IXIV-12 FLOAT -OUT
<br />Tanks not anchored (with backfill to top of tanks ready for piping
<br />and fully ballasted with gasoline) can float out should the tank
<br />hole be completely flooded with surface or ground water. Anchored
<br />tanks, fully ballasted, and backfilled similarly will not float
<br />out due to the weight of backfill on tank slab or deadmen.
<br />In either case, it is therefore, essential that the tank hole be
<br />filled completely with backfill to top of tanks. If not anchored,
<br />a minimum of 2 feet of additional fill above tanks would be
<br />required to prevent floatation under extreme conditions. It,
<br />therefore, is important that necessary installation and piping
<br />above the tanks be completed as quickly as possible so that this
<br />additional fill can be placed.
<br />IXIV-13 PIPING
<br />1. INTERNAL PIPING$OR PUMP
<br />It is recommended that actual clearances from the top of
<br />fitting to tank bottom be measured to insure that adequate
<br />clearances are maintained for remote pump, fill tube or any
<br />other internal piping installed.
<br />The pump and attached piping must be free to move with the
<br />tank. Use fill box around fill pipe at grade where asphalt
<br />or concrete pad is used. Do not place brick or other spacing.
<br />material on top of tanks.
<br />Ally -14 FILLING_rAN_XS ,
<br />Do not fill tanks until backfill is to t -u of tank. Never add
<br />product or water for hold down in dry hole conJ—itions until
<br />backfilling is completed.
<br />(EXCEPTION --SEE INSTALLATION PROCEDURE --WET HOLE)
<br />HIV -15 ADDING TANKS TO EXISTING INSTALLATIONS
<br />Tanks can be added to existing installations. It is important to
<br />remember that fiberglass tanks require good foundation support
<br />from surrounding soil and are not self-supporting under fuel or
<br />overburden loads. The following guides are suggestions to reduce
<br />loads from soil or product on uncovered tanks to no damage will
<br />occur. Final selection of method is the responsibility of the
<br />Shell engineer depending on local site conditions. See plot plan
<br />and addenda.
<br />1. ISOLATED BURY (PREFERRED)
<br />Install tanks in separate hole which is a minimum of 3' from
<br />edge of original tank installation hole. Undisturbed soil
<br />between new excavation and original hole must be maintained.
<br />Keep surface loads off existing tanks. ,
<br />2. BURY IN SAME HOLE (ALTERNATE)
<br />A. Lower product level in existing tanks to less than 1/3
<br />tank capacity.
<br />R. Remove surface pad, if one exists, to lower backfill.
<br />C. Excavate for new tanks, leaving as such backfill as
<br />possible around existing tanks.
<br />D. During installation, existing tanks must not be allowed
<br />to move. Shoring and sheeting may be required to retain
<br />backfill.
<br />E. Install new tanks as described earlier in these instruc-
<br />tions, leaving a minimum of 24" between new tanks and
<br />existing tanks.
<br />F. If backfill material other than pea gravel, stone, or
<br />gravel cruchings was used for existing tanks, shoring
<br />and sheeting should be left in place or an inert filter
<br />fabric should be installed between old and new backfill
<br />to prevent any migration into new granular backfill
<br />which could lead to tank failure.
<br />XIV -16 PERMANENT PIPE SUMPS
<br />Four (4) permanent pipe sumps will be installed in the locations
<br />shown on the installation drawing. The pipe sumps will consists
<br />of two (2) 4" slotted PVC pipes and two (2) 12" perforated PVC
<br />pipes. Specifications for the pipe sumps are indicated on the
<br />installation drawing. Pipe sumps should be placed in the tank
<br />hole before any pea gravel is installed so that the bottom is
<br />resting on the filter fabric excavation liner. The 12" sumps and
<br />a water pump can very effectively be used to control any water
<br />entering the hole during construction.
<br />The Shell engineer will furnish a list of national suppliers for
<br />the slotted 4" pipe. The 12" pipe can be purchased locally and
<br />should be perforated in the contractor's shop or at the job site.
<br />The perforated pipe should be wrapped with Typar or double wrapped
<br />with common hardware screen. Typar is the preferred wrapping if
<br />available in small quantities.
<br />XIV. - ALTERNATE
<br />SPECIFICATIONS FOR FIBERGLASS TANK INSTALLATION
<br />ALTERNATE SAND BACKFILL/WATER COMPACTION METHOD
<br />(NOTE: This method is an alternate to the pea gravel backfill method
<br />described in Shell drawings DR -81035 and DR -78006-3. Refer to
<br />Shell drawing DR -81047 for details pertaining to the bellow
<br />specifications. This method requires at least 40,000 gallons of
<br />water for ballasting and compaction from a pressurized rater
<br />source).
<br />GENERAL
<br />The contractor accepts full responsibility for proper handling and
<br />installation of the fiberglass underground storage tanks and shall insure
<br />that good workmanship, practices and construction procedures are followed
<br />during the handling and installation of the tanks, regardless of the
<br />inclusion or omission of any applicable suggestions in these instructions.
<br />Unknown situations or conditions not covered in these instructions are the
<br />responsibility of the contractor. Manufacturer's specialists are available
<br />for consultation. The presence of a manufacturer or Shell observer at an
<br />installation site does not relieve the contractor of his responsibility for
<br />proper installation of the.tank.
<br />Fiberglass underground tanks must be installed according to these instruc-
<br />tions and NFPA 30. Local codes may apply and should be consulted. Failure
<br />to follow these installation instructions of fiberglass underground tanks
<br />helps to prevent tank damage and to insure long -tern corrgtl ion -proof
<br />service. It is imperative to read, understand and follow the instructions
<br />below.
<br />Fiberglass underground tanks require the backfill material to provide as.
<br />much as 90% of the tank support under certain stress conditions. The
<br />installing contractor must be positive he has the correct bed and backfill,
<br />and must follow these instructions exactly.
<br />FOR ADDITIONAL INFORMATION
<br />Questions regarding installation procedures or tank repairs should be
<br />directed to the Shell engineer.
<br />1. iCONTRACTOR ACCEPTANCE INSPECTION
<br />The contractor is responsible for inspection for damage in shipment
<br />according to the check list included in the tank shipment. Any
<br />discrepancies should be reported to the Shell KnIlinoor,
<br />2. TESTING
<br />All tanks must be vented as tanks are designed for operation at
<br />atmospheric pressure only. -
<br />Plugs and drop tube,fittings are purposely not tightened at the plant
<br />to allow for temperature changes during shipment.
<br />Prior to setting the tank, the contractor is responsible for making an
<br />aerostatic leakage teat at a pressure not exceeding 5 psi. The test is
<br />to be conducted for a minimum of one hour without a measurable loss of
<br />pressure. .Tanks under pressure should not be left unattended. Use a
<br />pressure gauge with full scale of not more than 25 psi. Isolate tanks
<br />from piping when pressure testing any piping. Do not approach ends of
<br />tanks or manways while tanks are under test. Tanks under pressure
<br />ahould not be left unattended.
<br />While tank is under pressure, the entire tank, including fittings,
<br />should be wetted with a "soapy" solution to inspect for minor leaks
<br />which otherwise might not be evident. A garden tank -type sprayer with
<br />"Seam Test Solution" manufactured by Winton Products, Charlotite, N.C.,
<br />is recommended for this purpose. An alternate acceptable solation
<br />would be one (1) cup of dishwashing detergent such as Dove or Ivory
<br />liquid in a gallon of water.
<br />If tanks are dropped or impacted after initial test, retest tanks and
<br />soap areas of impact to check for tank damage. If damage has occurred
<br />do not attempt repairs. Contact the Shell Engineer.
<br />3. HANDLING
<br />A fiberglass tank weighs approximately 1/4 the weight of a comparable
<br />steel tank, so it is easier to handle. This tank is ruggedly built and
<br />has been designed to withstand normal handling, however, the following
<br />precautions shall be taken:
<br />CHOCK TANKS
<br />Tanks should not be dropped, rolled or impacted. Chock the tanks with
<br />used tires until ready for installation and tie them down if high winds
<br />are expected. Use minimum 1/2" diameter nylon or hemp rope over each
<br />tank and tie to wooden stakes of adequate size to prevent tanks from
<br />being moved by high winds.
<br />a;
<br />LIFTING TANKS
<br />Use so installation lift lux(s) to lift tank. On 15,000 and 20,000
<br />gallon tanks, use a spreader bar to insure lift angle of at least 450
<br />at each lift lug. Guide the tank with guidelines. Do not use chains
<br />or cables around tanks. If tanks have to be moved, (do not roll) set
<br />on smooth ground, free of rocks and foreign objects and rechock.
<br />Capacity of lifting equipment must be checked before installation.
<br />TANK OPENINGS
<br />Tank openings shall remain closed but tanks shall be vented during
<br />handling and, up to the time when pipe connections are made, tanks
<br />shall be protected from intrusion of foreign matter. All unused
<br />openings are to be securely plugged when piping is being installed.
<br />4. EXCAVATION OF TANK HOLE
<br />a. STABLE WALLS
<br />Those which normally can be made vertical from bed to grade
<br />without use of shoring or sheet piling. Hole must be large enough
<br />to allow a minimum of 24" between tanks at ribs and a minimum of
<br />24" from ends and sides of tanks to hole walls. Contractor will
<br />be responsible for comil isace with OSHA "Construction, Safety &
<br />Health Regulations Subpart P - Excavations, Trenching and Shoring,
<br />1926.650 thru 1926.653.
<br />b. UNSTABLE WALLS
<br />Defined as those soils having less than 750 lbs. per square foot
<br />cohesion calculated from an unconfined compression test, or soils
<br />with an ultimate bearing capacity of less than,3,500 the. per
<br />square foot. Excavation must be large enough to have at least 1/2
<br />the tank diameter between tank and hole side walls.
<br />If determined to be necessary by the Shell Engineer, filter fabric
<br />such as DuPont "TYPAR" or equal shall be used to line the tank
<br />hole to increase tank hole stability. See Shell Drawing -
<br />" DR -78005-2.
<br />C. DEPTH OF BURIAL
<br />Tank hole shall have a minimum depth of 12'-6". This will provide
<br />adequate hold down in high water conditions without the use of
<br />hold do" straps and deadmen. This excavation depth will provide
<br />3'-6" of cover to finished grade.
<br />d, PAD DIMENSIONS
<br />Reinforced concrete paving must extend at least 2' beyond tank
<br />outline in all directions, as a single slab. Provide 3/4" thick
<br />expansion joint all around slab for a 3 -tank system. Slab to be
<br />8" thick with 6"x 6" 4/4 welded wire fabric. A three-fank slab
<br />will be cast with two longitudinal construction joints, keyed and
<br />dowelled. Dowels to be 94 deformed round steel bars 30" long and
<br />placed approximately 48" on center in the center of the slab,
<br />Place an 8 mil polyethylene barrier over complete backfill before
<br />pouring the slab.
<br />e. MAXIMUM BURIAL DEPTH
<br />Depth of cover for tanks of t0' or less in diameter in both
<br />traffic and no -traffic conditions must not exceed 7' over too*
<br />top.
<br />,
<br />NOTE:
<br />NOT ALL SECTIONS OF THESE SPECIFCATIONS
<br />APPLY TO THIS JOB, REFER TO PLANS FOR
<br />APPLICABLE SECTIONS.
<br />3
<br />OATS APRU'D
<br />PRYLIM.
<br />PERMIT
<br />BID
<br />CONST.
<br />rAARK DATE RPVIYION6k - •Y
<br />GENKIRAL SPECiPICATIONs POPE
<br />MODULAR CONSTRUCTION
<br />14445 N. PERSHING AVENUE
<br />STOCKTON. CA,
<br />$HELL OIL COMPANY
<br />PACIFIC NORTHWAYT WSTRICT
<br />SCALE _
<br />OWN. BY
<br />RHI,♦
<br />w.I.c.,o 204'-.7624-24,'
<br />ROBERT H. LEE & ASSOCIATES, INC.
<br />ARCHITAGIURx PLANNING fiNtaNRRINO
<br />1027 HOW* AVENUE. .011. SACRAMENTO, CA 00080. 19161 049-4Op2
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