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rfi � Addendum to Quarterly Groundwater Monitormg&Remediation Status Report x t, dated September 25,1995 Moore Petroleum, 14800 W Frontage Rd,Manteca,CA . January 9, 1996 Page 2 REMEDIATION ACTIVITIES Data from the operation of both the vapor extraction and the water treatment system for the period of March 27, 1995 through June 15, 1995 was requested from Emcon by Apex and was received by Apex on January 2, 1996 This data has been combined with Apex's operational data to create cumulative totals for both the vapor extraction and water treatment systems Vapor Extraction Rem edi tion Sys M Status The vapor extraction system operating on site is manufactured by Remediation Service, Int'i (RSI) and consists of an internal combustion engine which uses the intake manifold vacuum to extract soil vapors The extracted soil vapors are mixed with propane and combusted within the engine and then discharged through two, in-line, catalytic converters, prior to atmospheric release RSI unit vapor extraction system operating data is included as Table I A summary of mass extraction rates based on laboratory analytical for the RSI unit is included as Table 2 Mass extraction rates and cumulative extraction totals have been updated and recalculated Vapor analytical results and chain of custody forms obtained from Emcon is included in Attachment 3 Sample calculations deriving miscellaneous vapor extraction quantities are contained in Attachment 4 • Groundwater Remediation System The RSI engine has an air compressor mounted to the engine block which is powered by an engine belt to generate compressed air which operates the groundwater pumping system The internal combustion engine units are not continuously running systems in that occasionally an engine malfunction will cause the unit to shut down When this scenario occurs, the engine needs to be repaired and then restarted When the engine stops running, the air compressor stops compressing air and therefore the groundwater pumping system will shut down Due to the dependancy of the groundwater pumping system on the operation of the engine, it is not a continuously running system. Therefore, it is not proper to calculate total gallons by multiplying flow rate in gallons per minute (g p m) by the number of minutes in a particular period Whenever the site is visited by Apex personnel, the flow rate and cumulative gallons are recorded to determme the amount of groundwater pumped within a particular period of time The water treatment system operating data has been included as Table 3, taking into account information ion obtained from Emcon. A summary of mass extraction rates based on laboratory analytical results for the groundwater treatment system is included as Table 4 Analytical results obtained from Emcon for the water treatment system are contained in Attachment 3. Sample calculations deriving miscellaneous groundwater extraction quantities are contained in Attachment 4