1212 GRAND AVE 2016-01-01 MF Import

March 3], 2008 Mr. Paul Tessicr L&A Job No. 8A027 Pagc 12 walls to prevent accwnulation of groundwater behind and buildup of hydrostatic pressurc against the walls. 'Chis drainagc blanket fili shoulJ be compacted to a non-yielding state with a vibratory compactor. Structural fill should bc used for backfilling the walls behind the vertical drainage blanket. The top 12 to 1 S inches of thc backfill may consist oCcompacted, clean, on-site granular soils. Heavy compaction equipment should not be allowed within the walls of a horizontal dislance equal to that of the wall heights. A 4-inch perforatcd PVC footing drain pipe, as recommended in thc DRAINAGE CONTROL section of this rcport, should be provided for the basement or extended footing walls. 'Che 1'ooting drain lines should be hydraulically connected to the drainage blanket behinJ lhe walls. SLAB-ON-GRAUF. FLOORS Slab-on-grade floors, if used, should bc� placed on firtn subgrade soils prepared as outlined in the Site Prenaration and General Gr:idinb and the Structural Fill sections of this reporl. Where moisture wntrol is critical, the slab-on-grade tloors should be placed on a capillary break which is in turn placed on thc compactcd subgradc. Thc capillary brcak should consist of a minimum four-inch-thick laycr of frcc-draining gravcl or crushed rock wntaining no mon� than 5% by wcight passing thc No. 4 sicvc. Wc rccommend that a vapor barricr, such as a 6-mil plastic membranc, bc placcd ovcr the cupillary break to kcep moisturc from migrating upwards. DRIVEWAY 1'AVF;MF.N'1' Perfommnce of drivcway pavcment is critically rclated to the conditions of the underlying subgradc soils. We rccommend thut lhe subgraJe soils under the roadway be tmated and preparcd as dcscrilxd in thc Sitc Prcparation :and Gcncral Grading sc�ction of this report. Prior to placing basc matcrial, thc subgradc soils, aftcr stripping of surficial unsuitablc soils, should be compacted to a non-yiclding state with a mechanical compactor anJ proof-rolled with a piece of hcavy construction equipment, such as a i'ully-loaded dump truck. Any areas with exccssivc LIU & ASSOCIATES, [NC. ' ��