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%Noe Soo, <br /> EA ENGINEERING, Western Regional Operations <br /> 41 ircle <br /> SCIENCE, AND Lafayette,Caette lifornia 94549 <br /> Vlow TECHNOLOGY, INC. (4t 5y 283-7077 <br /> 8 September 1987 <br /> D � <br /> Dan Moe <br /> San Joaquin Local Health District SEP L) 1987 <br /> 1601 E. Hazelton Avenue <br /> P.O. Box 2009 ENVIROMENTAL HEALTH <br /> Stockton, California 95201 F£RMIT/SERVICES <br /> Dear Dan: <br /> This letter is an explanation of what EA Engineering, Science, <br /> and Technology, Inc. ( EA) proposes to do at : Pershing Avenue and <br /> Robinhood Drive, Stockton, California. <br /> EA has conducted several hundred soil vapor contamination <br /> assessments ( SVGA) nationwide with many in California and the <br /> Central Valley in particular, a general approach to the Stockton <br /> site would be as follows: <br /> - Collect shallow ( 3 to 5 feet ) soil vapor samples, from <br /> the area which surrounds the storage tanks, also develop <br /> one, or more if necessary, vertical profiles( s ) near the <br /> tank field ( to 10{ or ground water level ) . <br /> - Collect at least one vertical profile vapor sample from <br /> the waste oil tank area . <br /> - Collect 3 to 5 shallow soil vapor samples from points <br /> along product lines especially in areas near joints in <br /> lines. <br /> - Collect any additional samples as may be appropriate, <br /> such as locations along property boundary where the site <br /> adjoins another property with fuel storage. <br /> -- If and when contamination is found, the extent of that <br /> contamination would be evaluated by extending the SVCA <br /> survey with additional points in locations stepped out <br /> from any contaminated points. This allows for more <br /> efficient placement of borings and monitoring wells when <br /> required. <br /> The SVCA methodology uses 5/8--inch steel rods with slotted tips <br /> that are hand driven utilizing an 8 pound harnmer to the desired <br /> depth . Once at depth a vacuum pump is used to purge soil. vapor <br /> from the probe and to ensure that a sample is representative. <br /> The vacuum pressure reading from the purging apparatus is then <br /> BALTIMORE 0 CHICAGO 0 CINCINNATI 0 LINCOLN ❑ NEW YORK 11 SAN FRANCISCO <br />