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Proposed oxygenate detection limits are as follows <br /> MTBE 5 ppb <br /> TAME 5 ppb <br /> DIPE 5 ppb <br /> ETBE 5 ppb <br /> T-Butanol 100 ppb <br /> Ethanol 500 ppb <br /> Methanol 1 ppm <br /> Task b Physical Property Analysts <br /> One soil sample from each lithological unit encountered will be analyzed for permeability, <br /> porosity, density, and fractional organic carbon content <br />• Task 7 Ground Water Monitoring Wells <br /> Borings drilled adjacent to existing wells MW-5 and MW-7, which currently have submerged <br /> screen intervals, will be converted to ground water monitoring wells, screened approximately 10 <br /> feet above and 10 feet below static water levels Wells will be completed using 2-inch diameter <br /> Schedule 40 PVC casing The sandpack will be placed 1-foot above the top of the well screen <br /> followed by a ]-foot thick bentonite seal Each well will be secured with a locking cap under a <br /> traffic-rated well box Wellhead elevations will be surveyed to Mean Sea Level by a State of <br /> California licensed surveyor A well completion detail will be prepared for each ground water <br /> monitoring well <br /> Existing wells MW-5 and MW-7 will be left in place for possible use as part of a well cluster <br /> Additional wells screened at other depth intervals may be proposed Construction of these wells <br /> will be dependent upon results of discreet soil and ground water sampling described above <br /> Details pertaining to these proposed wells and site investigation data supporting their <br /> installation will be submitted to S]CPHS for approval prior to installation <br /> Task 8 Well Survey <br /> A survey will be conducted to identify wells within a 2000-foot radius of the subject site The <br /> Department of Water Resources will be contacted and their files reviewed for well information <br /> Data tables and maps will be used to present this information <br /> 375 4 <br />