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PUBL'it HEALTH SEI` ICES <br /> SAN JOAQUIN COUNTY a. <br /> JGG1 KHANNA iM.D_M.P.H. <br /> =" Health Officer <br /> Y.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton, California 95201 <br /> (209) 468-3400 <br /> CRAIG OGATA ; <br /> COUNTY OF SAN JOAQUIN l_ <br /> ;9t <br /> GOVERNMENT BUILDINGS DIVISION r� <br /> 1722 SCOTTS AVE _ JUN L2 1992 <br /> STOCKTON CA 95205 f <br /> RE: San Joaquin County Motor PoolSITE CODE: 2518 <br /> South Della/Hazelton <br /> Stockton CA 95205 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) <br /> has reviewed the " Tank #3, Excavation and Sbil Sampling Work Plan" dated May 19, <br /> 1992 and prepared by Kleinfelder. PHS/EHD�ihas the following comments for your <br /> consideration. <br /> The work plan proposed excavation of "clean ;soils from 6 feet to 16 feet and <br /> contaminated soils from 16 feet to 22 feet. The excavation area proposed was _ <br /> approximately 20 feet wide and 40 feet long. PHS/EHD estimates the volume of soil <br /> removed would be approximately 480 cubic yards. PHS/EHD questions the designation <br /> of "clean" of the overburden soil. The circumstances associated with the removal of the <br /> former 1000 gallon waste oil tank make this designation questionable. <br /> �G <br /> The work plan indicated that two stockpiles would be generated, a "clean" stockpile and <br /> a contaminated stockpile. PHS/EHD estimates that the volume of "clean" soil generated : <br /> would be approximately 300 cubic yards and tyle volume of contaminated soil would be <br /> approximately 180 cubic yards. The work plan proposed that 8 discrete samples would <br /> be taken from each stockpile and Iab composrted into 4 analytical samples. PHS/EHD <br /> requires a.more volumetric approach to stockpile sampling. For soils that are to be <br /> placed back into the excavation, PHS/EHD recommends a sampling frequency of one <br /> discreet sample per 25 cubic yards of material(which may be laboratory analyzed at a 2 <br /> discreet samples to one laboratory sample. , Therefore, additional stockpile sampling will <br /> be necessary. ;} <br /> The work plan did not include side wall samples of the excavation to confirm that the <br /> contaminated soil had been removed, horizonLiIy; however, two bottom samples were E <br /> included to confirm that the contaminated soil. had been removed vertically. PHS/EHD <br /> recommends that sidewall and bottom samples be taken every.20 feet. Since soil borings <br /> B1, B2, and B3 have partially characterized- the soil contamination, only one sidewall <br /> sample, eastern, will be required. PHS/EHD "reserves the authority to request additional <br /> sampling if field observation warrant. t <br /> A Division of:an jo2quin County Health C;arc Services <br />