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WEST & HANSEN ENGINEERS, INC. <br /> P. O. Box 5891, Vacaville, California 95696 • (707) 451-1360 <br /> May 21 , 1991 <br /> a <br /> San Joaquin County 1 <br /> Public Health Services MAY 2 2 <br /> PO Box 2009 ENVIRON NEN i'Ai- HEALTH <br /> Environmental Health Division PERMIT/SERVICES <br /> 1601 East Hazelton Avenue <br /> Stockton, CA 95201 <br /> Attn: Letitia Resch REHS <br /> Subject: Closure In Place Proposal; Underground Boiler Fuel Tank <br /> Stockton Developmental Center <br /> Dear Ms. Resch, <br /> This letter report presents results of the soil boring program <br /> performed at Stockton Developmental Center May 1 , 1991 . As you <br /> know, soil borings were slant drilled under tank no. 3 , immediately <br /> north of the water tower, to determine soil conditions relative to <br /> our application to close this tank in place. Included in this <br /> report are a revised site diagram (cross section) showing actual <br /> soil sampling locations with respect to the tank, analytical <br /> results, boring logs, conclusions and our recommendations for <br /> future action. <br /> SOIL SAMPLE LOCATIONS: <br /> Two slant borings were completed, one under each tank end. The <br /> attached figure illustrates the locations of each boring and soil <br /> sample location with respect to the tank. Two soil samples were <br /> collected from each boring. <br /> Boring B1 was completed under the west tank end. Boring B1 as <br /> angled at 300 to the vertical and extended 25 feet in length. The <br /> bottom depth of B1 was 20 ' BGS . Two soil samples were taken in <br /> boring B1 , one at 16 ' BGS and the other at the hole bottom at 20 ' <br /> BGS. <br /> Boring B2 was completed under the east tank end. Boring B2 was <br /> angled at 45' to the vertical and extended 35 feet. The bottom <br /> depth of B2 was 22 feet BGS . Two soil samples were taken in boring <br /> B2, at 19 ' directly under the tank end and at hole bottom at 22 ' . <br />