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Aa <br /> .4 I/EOE GBOSyS/C/!7S i19 LE Po.ver tmi kuad. Sacramento. CA 95826 1916: 452.1W0l <br /> • FkFn1OM • Ci)ti A MESA • SACRAMENTO • HOUSTON <br /> August 18 , 1988 <br /> 0818DCAR <br /> AGS Job No. 38Q55- 1 <br /> Mr. David Carls <br /> Sal, Joaq>.lin Local Health District <br /> P. O. Box 2009 I <br /> Stockton, California 95201 <br /> Subject : Addendum to Work Plan for Evaluation of Soil and <br /> n I <br /> Ground-Water Contamination at aAbandoned Lerner <br /> i Service Station, 521 North Cherokee Lane, Lodi , <br /> California. I <br /> I <br /> Mr . Carls: <br /> To confirm our telephone conversation of August 17 , 1988 , and <br /> with the authorization. of RAMCON, Inc. , we present the following <br /> addendum to our work Plan, Applied GeoSystems Report No. 38055-1 <br /> (dated August 3, 1988) for the above-referenced site. The <br /> following is presented to address your concerns and to satisfy <br /> the conditions imposed prior to beginning field work at the site . <br /> � r <br /> o The bentonite seal above the gravel pack for the <br /> monitoring well will be at least 2 feet thick. <br /> o All water purged from the monitoring well during <br /> development and purging operations will be <br /> containerized until results of analysis of the water <br /> are received <br /> o Total petroleum hydrocarbons and benzene, toluene, <br /> ethyibenzene, and total xylene isomers will be measured <br /> I by extraction according to EPA Method 5030 followed by <br /> I analysis by a modified EPA Method 8015 and EPA Method <br /> 8020 which use a gas chromatograph (GC) equipped with a <br /> photo-ionization detector and a flame-ionization <br /> detector in series. Soil extracts and water samples <br /> are subjected to purge-and-trap introduction into the <br /> GC. <br /> II <br />