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Groundwater Monitoring Program <br /> Quarterly groundwater monitoring and .sampling will be conducted on groundwater monitoring <br /> wells MW-1, MW-2 and MW-3 for four quarters. Field activities consist of monitoring depth-to- <br /> water and.depth-to-bottom measurements. Depth-to-water readings will be used to determine the <br /> groundwater elevation and groundwater flowdirection beneath the project site. Wells will be <br /> monitored for free product.. Water samples will then be collected from each well after purging a <br /> minimum of three well volumes (casing and sandpack). The ,samples will be sent using chain-of- <br /> custody record to a State-certified laboratory analysis of TPHg and BTEX using EPA methods <br /> 8015/8020, and MTBE using EPA method 8020 for the first quarter. If MTBE is detected, <br /> confirmation by EPA method 8260 will be conducted. If MTBE is not detected, during <br /> —`– ---subsequent quarters the-groundwater'samples-will be analyzed for only-TPHg/BTEX-using EPA <br /> methods 8015/8020. : Purge water from the wells will be contained on-site in 55-gallon DOT <br /> approved drums pending laboratory analysis. If sample results indicate nondetectable levels of <br /> petroleum hydrocarbons, discharge to the ground surface is proposed. <br /> After laboratory results are received, a report will be prepared containing results of the <br /> monitoring and sampling activities for the client and appropriate regulatory agencies. <br /> All work described in this addendum will be performed in accordance with Smith <br /> Environmental's Field Procedures and Site Safety Plan on file with PHS/EHD, and will be <br /> performed under the direction of a California Registered Geologist or Professional Engineer. <br /> Please call our office at (209) 579-2221 if you have any questions or comments regarding this <br /> project. <br /> Sincerely, <br /> Smith Environmental Technologies Corporation <br /> William-Madison <br /> Staff Geologist QR CFiSS,�L�/j`jgll, <br /> N AISEY <br /> Jeanne Homsey s <br /> CA Registered Civil Engineer No. C47410 h C0417410 <br /> F,xp._ 12199 <br /> cev,� ��ta <br /> cc: Dr. A.R. Glover �' Of CALF <br /> 95 11 MLETrERS1Ladden.doc 3 <br /> • <br /> SMTH <br />