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ENV. <br /> AMERICA <br /> Mr. Duane White <br /> California Department of Toxic Substances Control <br /> January11, 2005 <br /> Page 2 of 4 <br /> Revised Groundwater onitoring Program <br /> Zone Well Monitoring Field' Labo atory Analyses <br /> Frequency Parameters PAHS2 BTEX3 TPHg4 TPHd' Bio6 <br /> A MW4 Annual X X X X X X <br /> A MW7 Annual X X X X X X <br /> A MW8 Annual X X X X <br /> A MW9R Annual X X X X X X <br /> A _RW__12 Annual X X X <br /> A MW18 Annual X X X <br /> A MW20 Annual X X X X X X <br /> A MW21 Annual X X X <br /> B MW5 Annual X X X X <br /> M <br /> B W6R Annual X X X X <br /> B MW19R Annual X X X <br /> B MW22 Annual X X X X <br /> B MW23R Annual X X X X <br /> B 4W26R Annual X X X X X X <br /> C MW 13 Annual X X X X X X <br /> C MW14 Annual X X <br /> C MW24 Annual X X X X X X <br /> C MW25 Annual X X X X X X <br /> Total Sam les: 18 13 8 1 8 17 18 <br /> 1. Field parameters include measurements of depth to water, electrical conductivity, pH, and <br /> temperature. <br /> 2. PAHs=polycyclic aromatic hydrocarbons analyzed using EPA Method 8310. <br /> 3. BTEX=benzene,toluene, ethylbenzene, and xylenes analyzed using EPA Method 8021. <br /> 4. TPH9=total petroleum hydrocarbons quantified as gasoline analyzed using EPA Method <br /> 8015M. <br /> 5. TPHd =total petroleum hydrocarbons quantified as diesel analyzed using EPA Method <br /> 8015M. <br /> 6. Bio=bioremediation indicator parameters for evaluation of natural attenuation of <br /> constituents of concern in groundwater. Samples will be collected for <br /> measurements/analysis of these parameters once every two years, starting in 2006. Bio <br /> parameters will include: <br /> — dissolved oxygen (field measurement) <br /> — oxidation-reduction potential(field measurement) <br /> — dissolved iron using EPA Method 6010 <br /> — dissolved manganese using EPA Method 6010 <br /> — sulfate using EPA Method 300 <br /> 7. Annual monitoring will be conducted during the first quarter when groundwater level is <br /> usually higher than other times of the year. Annual report will be submitted to the DTSC by <br /> November 15. <br /> 8. Tentative, pending further evaluation of groundwater conditions in the vicinity. <br /> P:\PG&E\Stockton\Correspondence\OM$est Jan2005 fnal.doc <br />