5016 HARBOR LN 2016-01-01 MF Import

� ,""ti �._.. JAVID L. NELSON AND ASSOGIATFS, INC. �; , Consulting Enginttring GeoloQy i � � � � ��. � � L�! � � �1 October 27, 1988 Project No. 13288 Page 3 are generally overlain by 0.5 to 1.5 feet of br:;wn loose silty sand Nith roots and 0.5 feet of organic topsoil. Mithin the suspected artificial fill or surficially modified ground areas, Lhe dense basal soils were found at greater depths, and are overlain by variable materials. As shown 1n TP-5, TP-6, TP-7. TP-9 and TP-10, artificial fi11 occurs overlying the native materials. During our exploretion, we found that past grading probably has occurred in the area, creating the present surface conditions. It appears that an old drainage swale ma�y have occurred within the area, located approximately as shown on the location map. As shown on the test pit logs, the dense basal soils are overlain within the suspected deeper otd swale area by abou� 2 feet of brown, medium dense, poorly sorted gravelly silty sand (netural) in a Met condition, which is directly overtain by of variable and non-uniform artificial fill. The artificial fill Nas found to vary from black/brown, loose, organic silty sand, organic debris, wood, logs, etc., to grey and bravn, loose mixed gravelly silty sar�d ►vitfi scattered organics. The filt appears to thin toward the west, south and east, creating the indication of an old (filled) drainage swale, and of grading and fitling along the easterly portion of the site. The artificial fill, where encountered, appears to vary from about 2 to 8 feet thick, but could be thicker within the area of the main old drainage swale. A thin �about 1 foot thick) strata of arrtificial fill was encountered along the top-of-slope area (see TP-2, TP-3 and TP-4), probably derived from past clearing and grading operations within the area. Hydrologic Conditions The true ground water table was not encountered in any of the test pits performed around the site area. Met to very wet conditions were observed Within the fill areas, and particularly within the o1d drainage swale area. These conditions are considered perched water, a condition create:d by the occurrence of the relativety impermeable basal soils, where surface waters cannot readily penetrate. Accumulated surface waters within the site flow along the interface of the dense basal soils/overlying soils (or fi111, and Y �