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l h <br /> San Joaquin County, Local Oversight Program <br /> October 01, 2001 <br /> Page 3 <br /> Total petroleum hydrocarbons in the gasoline range (TPHG) were detected at low concentrations <br /> m three wells, MW4 (86 gg/L),MW-5 (260 pg/L) and MW-8 (200 µg/L) See Figure 3. <br /> Benzene was found at concentrations exceeding the maximum contaminant level(drinking water <br /> standard) in two of the monitoring wells at concentrations ranging from 2 0 to 3 8 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 m five 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 /> standard) of 19 pg/L <br /> The other U S EPA Method 8260B Fuel Oxygenates were not detected above their respective <br /> detection iimts in groundwater samples as indicated in Table 3. Ethylene dibromide and 1,2- <br /> Dichloroethane were below their respective detection limits <br />�l The following schedule will be observed for groundwater monitoring during 2001: <br /> Third Quarter 2001 Sampled Mid 2 weeks of August Report by October 10 <br /> Fourth Quarter 2001 Sampled NLid 2 weeks of November Report by January 9 <br /> First Quarter 2002 Sampled Mid 2 weeks of February Report by April 12 <br /> Second Quarter 2002 Sampled Mid 2 weeks of May Report by July 11 <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 /> ED G <br /> Sincerely, �`y,�ER ,rplo� <br /> GARY D LOWE o'a �wC7 QARY D.Ldf <br /> 55Q� <br /> NO 19 1� 4 <br /> CC-ATFIED C�JiTtFI� <br /> * Er�Iri��rilr�G <br /> 4Garyoe, R G (3768), GEOLOGIST <br /> C E.G. (1559), C HG (127) `JP 'sAF o <br /> Principal, Hydrogeologist �CA��f �xG�L�� <br /> H20GEOL A GroundWater Consultancy <br /> i <br /> H20GEOL A GROUNDWATER CONSULTANCY <br />