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.� - A <br /> rMoN <br /> Geological%clinics <br /> 2603 XivcrXxd T�viro+unentaor�ru&in <br /> Mode to,CA 95351 f C BSpeciaftrtr <br /> 1209,538.780S <br /> Bill Stewart's Property <br /> Beacon Station <br /> Proposal <br /> RAP-Hydrocarbon Contaminated Soil <br /> 1.0 OBJECTIVE <br /> 'r The object of this project is(o: 1)excavate the contaminated soil down to ground water, 2) <br /> stockpile this soil on-site until treatment can commence, 3)while the excavation is open,pump <br /> up to 10,000 gallons of contaminated water and store it in an above-ground swing tank until it is <br /> treated, 4)aerate soil on-site to reduce]_vets below 100 ppm and then dispose this material at <br /> a local landfill,and 5) treat the water with carbon filtration and then release it.into the City <br /> r sewer. <br /> 2.0 SITE HISTORY <br /> 2.1 Summary of Please I Assessment <br /> The upper 21 feet of strata was investigated during this project. In this interval, the <br /> soil is characteriz4 by fine-grained sediments which are dominated by clay-rich } <br /> horizons interbedded with thinner silt or sand horizons. Below 20 feet is a silty clay,a <br /> water-bearing zone of silty and clayey sand is located between 20 to 17 feet and from 17 <br /> to 14 feet is a soft wet sandy clay. From 14 up to about 11 or 10 feet is a clayey sand that F <br /> is also water-bearing. This sand grades into a silt to the north. Above 1I or I0 feet is a <br /> sandy clay unit that has a few feet of organic rich top soil near the surface. <br /> j The ground water gradient is to the north,which is reflected in the migration path of <br /> contamination. Analytical data shows that soil or ground water contamination has not <br /> Fy moved south of the tank,but has moved at least 30 feet to the north. Soil <br /> i contamination has two modes of dispersal:that ttugrating out directly from.the tank <br /> and that which is dispersed by ground water movement. The cross section given in <br /> Figure 3 shows the contamination distribution. Soil and ground water analytical data <br /> generated during ire preliminary investigator has been summarized in Table 1. <br /> Ef a 2.2 Summary of Tm*Removal <br /> –_ _---_—..---Subsequent to this assessment all threeunder-ound-fuel sto.a c tanks were removed <br /> l� - <br /> h <br />