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Subsidence ln��estigation SDII Project Number:3023547 Quiros-Martii�ez Residence-Zephyrhills, Florida The total qu:mtity of grout required can vary based on site conditions, but is likely to be between 100 and 17`� cubic yards (cy). The estimated cost for repair is based on the higher volume of grout. Following the compaction gouting, SDlI recommends, based on the very loose shallow soil conditions encountered in the hand auger and SPT boring, that the shallow soils arot►nd the perimeter of�he residence be stabilized through a program of vertical chemical grout injection. The chemical grout injection should be high-density polymer resins that when mixed, will create an expandint; polyurethane (or equivalent) foam that can lift, realign, and fill voids under concrete slab,� and foundations being supported by base soils. Typically, once injected, the resin mixture expa.nds into the composite rnaterial (foam), filling voids, bindrng soils, and exerting a controlled compressive uplifting force under a limited area of the slab/foundation. The foam then cures inl:o a stable replacement base material for the slab/foundation. The chemical grout should be ve,�tically injected approximately 5 feet on center over a depth range from 2 to 8 feet below the for.>ting around the perimeter of the residence, through drilled holes in exterior slabs where necess.,ary. A total of 29 vertical injection points will be required under the foundation slab at the a�rproximate locations depicted in Figure 7. If necessary, points shall be inclined as necessary so that the material will be injected directly beneath the center of the footing or load bearing locati�on closest to each injection point. An estimated 20 to 25 pound of material will be required at earh injection location. The chemical grout injection should be postponed a minimum of 30 days af't.er the completion of the compaction grouting to allow for any subsequent ground movement to occur. The contractor is to submit a detailed description of the proposed chemical injection prog;ram for approval. A list of estiriiated costs for repair and engineering supervision is provided below, lt does not include estim��tes for cosmetic repairs, which should be estimated by a qualified insurance adjustor or co�ntractor. Cosmetic repairs can begin shortly after the completion of the chemical grout injection.s. A. Install grout pipes: 15 @ 60 feet(average)@$17/ft......... ......... ....$]5,300 B. Groutii7g: 175 cy @$170/cy...................................... ......................$29,750 C. Mobili:zation and injection of up to 725 pounds of material...............$9,250 D. Monitc�ring and Certification........................................................... $4.975 Total.............$59,275 This cost estirnate should be considered an "order of magnitude" estimate of actual construction costs, and therefore should not be construed as a bid for perforrning the work. Actual costs can only be deterrriined through solicitation of bids from qualified contractors. Continuous m�anitoring by 5DII personnel during remediation is suggested to verify compliance with these recc�mmendations and to make necessary adjustrnents to the remediation program due to unforeseen ;..ite conditions. This will also allow the engineer who created the remedial design to certify that t�e remediation met design specifications. 3-5