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Ms Vicki McCartney <br /> June 30, 2003 <br /> • Page 3 <br /> Benzene was detectable in groundwater from MW-4 at concentration of 1 3 pg/L Samples from <br /> the other wells were reported as "N D " (<0 5 µg/L, with the exception of MW-5 and MW-8 <br /> where the reporting limit was raised to <2 5 Vg/L) See Table 3 and Figure 3 The other <br /> aromatic hydrocarbon compounds,toluene, ethylbenzene, and total xylene isomers, were as <br /> reported in Table 3 <br /> MtBE was found in seven of the monitoring wells as indicated in Table 3 and Figure 3 Four of <br /> the monitoring wells (MW-4, MW-5, MW-6, and MW-8) were with concentrations above the <br /> maximum contaminant level (primary drinking water standard) of 13 gg/L One(MW-7 at 11 <br /> pg/L) was between the primary and secondary drinking water standard (5 0 gg/L) and two <br /> (MW-1 at 0 62 pg/L and MW-2 at 0 96 pg/L) were between the detection limit of 0 5 and the <br /> secondary drinking water standard <br /> TBA was not detected in the eight samples TAME was detected in the samples from MW-4 <br /> (0 62 gg/L), MW-5 (6 7 pg/L) and MW-8 (5 8 pg/L) <br /> The other U S EPA Method 8260B Fuel Oxygenates were not detected above their respective <br /> detection limits in groundwater samples as indicated in Table 3 Ethylene dibromide and 1,2- <br /> Dichloroethane were below their respective detection limits <br /> For all future monitoring events the required 48-hour notice to EHD will be provided The <br /> following schedule will be observed for groundwater elevation monitoring and sampling during <br /> the remainder of 2003 <br /> Third Quarter 2003 Sampled Mid 2 weeks of August Report by October 15 <br /> The Thud Quarter will be scheduled to occur between 8:00 A M and 5 00 P M <br /> Monday through Friday during the week of August 11,2003 <br /> Fourth Quarter 2003 Sampled Mid 2 weeks of November Report by January 15 <br /> Please do not hesitate to email h2ogeol@a,comcast net or call the undersigned at 925-373-9211 <br /> and/or telefax at 925-373-9222 should you have any questions <br /> Sincerely, ��RD G'Eo�� <br /> C� G, <br /> GARY D LOWE �a r-D 0g0 <br /> he IW o <br /> GM p Lt1 eP� <br /> G.E(OX "I Pta 1?7 <br /> Gary D Lowe, R G (3768), C.E G. (1559) <br /> C HG (127) �A' <br /> Principal, Hydrogeologist <br /> H20GEOL A GroundWater Consultancy +OP C <br /> 0 <br /> H2 OGEOL A GROUNDWATER CONSULTANCY <br />