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. ground water monitoring wells will be installed as proposed in Cambria's February 28, 1998 Work Plan If during the drilling of this boring ground water is encountered at a depth greater than 40 fbg and there is no field evidence that petroleum hydrocarbon impacted soil extends to the depth where ground water occurs, aground-water sample will be collected for analysts This ground water sample alon With the last soil sample collected above ground water will be submitted to the lab for analysts on a 24-hour turn around basis If these two samples do not contain detectable levels of petroleum hydrocarbons or fuel oxygenates then no ground water monitoring wells will be installed at the site If petroleum hydrocarbons and or fuel oxygenates are present in any of these two samples then a ground water monitoring well will be installed adjacent to the boring location, and two additional ground water monitoring wells will be installed as proposed in Cambria's February 28, 1998 Work Plan Oxygenate Analyses As requested by SJCPHS in a April 15, 1998 phone call, analysis for fuel oxygenates will be performed on all ground water samples and selected soil samples during this investigation Oxygenates to be analyzed for include methanol (by EPA Method 8015) ethanol, MTBE, tertiary- butyl-alcohol, di-isopropyl ether, ethyl-tertiary-butyl-ether, and tertiary-amyl-methyl-ether (by EPA Method 8260) Schedule Cambria is prepared to begin work upon approval of this work plan by SJCPHS and receipt of appropriate permit from SJCPHS A permit application has been completed and has been sent this week to SJCPHS Cambria has scheduled the drilling of the soil boring (and possible well installation) for Friday April 24, 1998 A second drilling date, for well installation, has been scheduled for April 30, 1998 should well installation be warranted i 240-0797 3