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.. <br /> San Joaquin County, Local Oversight Program <br /> ,r June 20, 2001 <br /> Page 3 <br /> i6. Total petroleum hydrocarbons in the gasoline range(TPHG)were detected at low concentrations <br /> in two wells, MW-5 (160 gg/L) and MW-8 (100 pg/L). See Figure 3. <br /> L. <br /> Benzene was found at concentrations exceeding the maximum contaminant level(drinking water <br /> standard) in five of the monitoring wells at concentrations ranging from 1.1 to 2.7 pg/L (Table 3 <br /> and Figure 3). The other aromatic hydrocarbon compounds; toluene, ethylbenzene,and total <br /> xylene isomers,were detected as indicated in Table 3. <br /> MTBE was found in six of the monitoring wells as indicated in Table 3 and Figure 3,three of <br /> which(MW-4, MW-5,and MW-8)were above the maximum contaminant level(drinking water <br /> L. standard)of 19 pg/L. <br /> The other U.S. EPA Method 8260B Fuel Oxygenates were detected above their respective <br /> detection limits(TBA<5.0 µg/L;MTBE<5.0 pg/L;DIPE<10.0 pg/L;ETRE<5.0 pg/L;and <br /> TAME <5.0 µg/L) in groundwater samples as indicated in Table 3. Ethylene dbromide and 1,2- <br /> Dichloroethane were below their respective detection limits. <br /> The following schedule will be observed for groundwater monitoring during 2001: <br /> +- Second Quarter 2001 Sampled Mid 2 weeks of May Report by July 11 <br /> Third Quarter 2001 Sampled Mid 2 weeks of August Report by October 10 <br /> Fourth Quarter 2001 Sampled Maid 2 weeks of November Report by January 9 <br /> �- First Quarter 2002 Sampled Mid 2 weeks of February Report by April 12 <br /> Please do not hesitate to call the undersigned at 925-373-9211 and/or telefax at 925-373-9222 <br /> should you have any questions. <br /> aEo a <br /> Sincer , Ly ��� X01 <br /> GARY c. 4 �� `i'� ��� WX D.t ouv OcN� <br /> IV <br /> :i � CSD <br /> �.CCa.Jl3c.i <br /> Gary D. Lowe, R.G. (3768), <br /> ,,. C.E.G. (1559), C.HG.(127) <br /> Principal,Hydrogeologist °F CALF° <br /> H2OGEOL A Groundwater Consultancy <br /> Ln H20GEOL A GROUNDWATER CONSULTANCY <br />