7100 HARDESON RD 2016-01-01 MF Import

Fisher 3 Sons, Inc. Auyusl 19, 7997 Locatlon of Minfmum Fill Placemant Relativa Compactlon Beneath iootinps, siaos or ; aa�+ walkways-•--••-•-•---••---...;-----•••-• .................. . _ ... Behind retaining_walls,.,..__, 90% . _..--•••-•....-•• .-...----• ... ........... 95% tor upper 12 Beneath pavements _ inches of subprade; WMra; Minknun RNatlw Camp�eUon It tM raqo, ��cpr��d In p�rnntape�. of tlN eompKtM drY d�ndlY M tlr m�aMMm drY d�naty, u a�txminM In xeoMMe� wIM AaTM TM Wtlpnatlan D 166f-� (ModlMd Praetw►. Use of OnSite Soil JN 97282 Paqe 8 If grading activities take place during wet weather, or when the silty, on-site fill soil is wet, site preparation costs may be higher because of delays due to rain and the potential need to import granular fill. The on-site fill soil is generally silty and therefore moisture-sensitive. Grading operaGons will be difficult during wet weather, or when the moisture content of this soil exceeds the optimum moisture content. if the on-site soils are used as structural fill, the moisture content of these soils must be at, or near, the optimum moisture content, as the soil cannot be consistendy compacted to the required density when the moisture content is significandy greater fhan optlmum. The moisture content of the on-site soil was generally above the estimated optimum moisture content at the tlme of our explorations. The fill sofl could be reused as structural fill, only ff grading operations are conducted during hot, dry weather, when drying the wetter soil by aeration is possibie. During excessively dry weather, however, it may be necessary to add water to achieve the optimum moisture content. Moisture-sensitive soil may also be susceptible to excessive softening and "pumping" from constrvction equipment, or even foot traffic, when the moisture content is greater than the optimum moisture content. It may be beneficial to pmtect subgrades with a layer of imported sand or crushed rock to limit disturbance from traffic. ideally, structural fill that will be placed in wet weather should consist of a coarse, granular soil with a silt or clay content of no more than 5 percent. The percentage of partiGes passing the No. 200 sieve should be measured from that portion of soil passing the three-quarter-inch sieve. LIMITATIONS The analyses, conGusions, and recommendations contained in this repoR are based on site conditions as they epsted at the time of our explora6on and assume that the soil encountered in the test borings is representative of subsurface condibons on the site. If the subsurfaoe condiUons encountered during conshuction are significandy different from those observed in our explora8ons, we should be advised at once so that we can review these condidons and reconsider our OFATECH CONSULTAM3, Q�1C.