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Ms Vicki McCartney <br /> October 31, 2003 <br /> Page 3 <br /> Benzene was detectable in groundwater from MW-4 at concentration of 9 4 µg/l. and MW-8 at <br /> 9 7µg/L Samples from the other wells were reported as "N D "(<0 5 pg/L, with the exception <br /> of MW-5 where the reporting limit was raised to <2 5 gg/L) See Table 3 and Figure 3 The <br /> other aromatic hydrocarbon compounds, toluene, ethylbenzene, and total xylene isomers, were as <br /> reported in Table 3 <br /> MtBE was found in groundwater from the six monitoring wells as indicated in Table 3 and <br /> Figure 3 Four of the monitoring wells (MW-4, MW-5, MW-6, and MW-8) were with <br /> concentrations at or above the maximum contaminant level(primary drinking water standard) of <br /> 13 µg/L One well was reported with MtBE concentrations (MW-1 at 8 0 µg/L) between the <br /> primary and secondary drinking water standard (5 0 pg/L) and one (MW-7 at 2 8 µg/l- was <br /> between the detection limit of 0 5 and the secondary drinking water standard <br /> TBA was detected an MW-4 groundwater at a concentration of 19 pg/L and TAME was detected <br /> in the samples from MW-4 (0 92 pg/L), MW-5 (9 2 µg/L) and MW-8 (0 97 µg/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 dnbrormde and 1,2- <br /> Dnchloroethane were below their respective detection limits <br /> . The Customer Company has reassigned their former Store#37 located at 15 Grant Line Road in <br /> Tracy to ATC Associates, Inc No further activities at this site will be performed by the <br /> undersigned <br /> Please do not hesitate to email h2ogeol&comcast net or call the undersigned at 925-373-9211 <br /> and/or telefax at 925-373-9222 should you haveany uestnons <br /> - YlzzeD GE70zO �,�SptED Cte0c <br /> Sincerely, <br /> C76 <br /> f <br /> GARY D LDWE '�'-� Astra Cip Y D.LONE VP <br /> NO <br /> Gary D Lowe, R G (3768), C E G (1559) * ENGIO M NG �•, � ; `� <br /> C HG 12 GE0'-0GZT <br /> Principal, Hydrogeolognst AQP Cry+ <br /> H20GEOL A GroundWater Consultancy ' <br /> Xc <br /> Mr John Johnson, The Customer Company, 4457 Park Road, Benecna, CA 94510-1124 <br /> California Regional Water Quality Control Board, Central Valley Region, Sacramento, <br /> Main Office, 3443 Routner Road, Sacramento, California 95827-3098 <br /> Mr Robert Mathews, More,for Less, 3336 Bradshaw Road, Suite 280, Sacramento, <br /> i California 95827 <br /> H2 OGEOL A GROUNDWATER CONSULTANCY <br />