1505 112TH ST SW 2018-01-02 MF Import

GEOTTZMCAL ENGINEERING STUDY Wells Development Cor,vsrallon E-5813 July .27, 1992 Page 2 Surfac The subject site is bout,Jed by vacant lots on the north and east, I I:.th Street Southwest on the south, and a single-family residence on the west (see Plate 1, Vicinity Map). Total on -site relief is on the order of twenty (20) feet, draining to the southwest. Existing site grades arc generally flat except for the north - facing slopes along the southern perimeter of the site. These north slopes arc inclined at about 2H:1V to 3HA V. The site drains into a 'detention swale' in the southwest portion of the site. The swale then drains to the southwest comer of the property. At present, the site is occupied by two single-family residences, with basements, one close to 112th Street Southwest and one in the north portion of the site. Various stockpiles are located along the southern edge of the property. A gravel driveway runs along the west property line to the northern single-family tesidence. Otherwise, the site is covered with several landscaping tree and brush. Debris of all kinds is spread throughout die property, including a 55-gallon drum. The site was explored by excavating five test pits at the approximate locations shown on Plate 2. Please refer to the Test Pit Logs, Plates A2 to A4, for a detailed description of the conditions encountered at each location explored. A description of the field exploration methods is included in Appendix A of this report. The following is a generalized description of the subsurface conditions encountered. The site is underlain by about dime to four feel of loose to medium dense silty sand with gravel. Beneath this )aver, a medium dense grading to very dense silty sand with gravel (glacial till) was encountered to the maximum depth of exploration (twelve feet). I , t -I'3RfTi Perched groundwater seepage was encountered in Test Pit TP-1 at a depth of about two feet. However, the groundwater seepage flow is not static; thus, one may expect fluctuations in the amount of seepage depending on the season, amount of rainfall, surface water runoff, and other factors. Generally, seepage is greater in the wetter winter months (typically October through May). Earth Consultants. Inc.