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Geofo®lccd Technics Inc <br /> "01 R(Offf,od [jealagiralm�l�vra�+�aiuslsprcaluv� <br /> madaw,CA gosj <br /> fzo91 xta•u2r <br /> WORK PLAN <br /> SOIL ANIS GROUND WATER INTERIM REMEDIATION <br /> AND GROUND WATER MONITORING <br /> William Stewart's Beacon(Bill's Bait) <br /> 515 11th Street <br /> a ray,California <br /> 1.0 PURPOSE AND SCOPE <br /> The purpose of this work plan is to revise the scope of work to be performed at 915 W.11th <br /> 'r. Street for both the remedial action plan and site monitoring. In response to the group meeting <br /> held at the California Regional Water Quality Control Board's (CRWQCB) office in <br /> Sacramento,Geological Technics proposes the following scope of work: <br /> I. Backfill the old tank excavation and bring it up to grade, <br /> 2. Install the new underground storsge tank(UST)and pump island sfstem, <br /> 3. Install one more down gradient well on the adjacent property to the north, <br /> 4. Perform an interim ground water remediation, <br /> 5. Initiate a long-term ground water monitoring schedule. <br /> 2.0 SITE HISTORY <br /> 2.1 Summary of Phase I Assessment <br /> The upper 21 feet of strata was investigated during this project. In this interval, the. <br /> soil is characterized 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 lorated 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 <br /> is also water-bearing. This sand grades into a silt to the north. Above 11 or 10 feet is a <br /> sandy clay unit that has a Rewe feet of organic rich top soil near the surface. <br /> The ground water gradient is to the north,which is reflected in the rnig�'ation path of <br /> contamination,. Analytical data shows that soil or ground water contamination has not <br />