ARCHIVED REPORTS_SEMI ANNUAL GROUNDWATER MONITORING OCTOBER 2010

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1Lancaster . Laboratories Analysis Report 2425 New Holland Pike,PO Boz 12425,Lancaster,PA 176052425•717-656-2300 Fax:717-656-2681•www.laricasterlabs.Com Page 5 of 21 ' Quality Control Summary ' Client Name: Chevron Group Number: 1210187 Reported: 09/14/10 at 04:55 PM Blank Blank Blank Report LCS LCSD LCS/LCSD Analysis Name Result MDL.. jQQ Units @RBC RSC Limits RPD RPD Max Batch number: M102502AA Sample numberis) : 6075629-6075630,6075633-6075634 Acetone N.D. 6. 20 ug/l 159 163 49-234 3 30 t-Amyl methyl ether N.D. 0.5 4 ug/1 93 95 77-120 3 30 Benzene N.D. 0.5 4 ug/l 97 97 79-120 0 30 Bromobenzene N.D. 1. 5 ug/1 98 100 80-120 1 30 Bromochloromethane N.D. 1. 5 ug/l 101 103 80-120 2 30 Bromodichloromethane N.D. 1. 5 ug/1 94 95 80-120 1 30 Bromoform N.D. 1. 5 ug/l 81 82 61-120 1 30 Bromomethane N.D. 1. 5 ug/l 77 91 44-120 17 30 2-Butanone N.D. 3. 10 ug/l 107 106 66-151 1 30 ' t-Butyl alcohol N.D. 5. 80 ug/l 105 106 62-129 1 30 n-Butylbenzene N.D. 1. 5 ug/1 84 88 74-120 4 30 sec-Butylbenzene N.D. 1. 5 ug/l 90 93 78-120 2 30 tert-Butylbenzene N.D. 1. 5 ug/l 96 97 80-120 1 30 Carbon Disulfide N.D. 1. 5 ug/1 81 82 62-120 2 30 ' Carbon Tetrachloride N.D. 1. 5 ug/1 99 101 75-123 2 30 Chlorobenzene N.D. 0.8 5 ug/1 101 102 80-120 1 30 Chloroethane N.D. 1. 5 ug/l 88 90 49-129 2 30 2-Chloroethyl Vinyl Ether N.D. 2. 10 ug/l 54- 53• 56-129 2 30 Chloroform N.D. 0.8 5 ug/l 99 101 77-122 2 30 ' Chloromethane N.D. 1. 5 ug/l 99 103 60-129 4 30 2-Chlorotoluene N.D. 1. 5 ug/l 98 99 80-120 1 30 4-Chlorotoluene N.D. 1. 5 ug/1 96 97 80-120 1 30 1,2-Dibromo-3-chloropropane N.D. 2. 5 ug/l 77 80 66-120 4 30 Dibromochloromethane N.D. 1. 5 ug/l 92 93 80-120 1 30 1,2-Dibromoethane N.D. 0.5 4 ug/l 98 100 80-120 2 30 Dibromomethane N.D. 1. 5 ug/l 96 100 80-120 4 30 1,2-Dichlorobenzene N.D. 1. 5 ug/l 97 99 80-120 2 30 1,3-Dichlorobenzene N.D. 1. 5 ug/l 97 99 80-120 2 30 1,4-Dichlorobenzene N.D. 1. 5 ug/l 97 98 80-120 1 30 Dichlorodifluoromethane N.D. 2. 5 ug/l 88 90 47-120 2 30 1,1-Dichlorcethane N.D. 1. 5 ug/1 92 97 79-120 6 30 1,2-Dichloroethane N.D. 0.5 4 ug/l 98 99 70-130 0 30 1,1-Dichloroethene N.D. 0.8 5 ug/1 96 98 74-123 2 30 cis-1,2-Dichloroethene N.D. 0.8 5 ug/l 98 102 80-120 4 30 trans-1,2-Dichloroethene N.D. 0.8 5 ug/1 99 101 80-120 2 30 1,2-Dichloropropane N.D. 1. 5 ug/1 96 98 78-120 1 30 1,3-Dichloropropane N.D. 1. 5 ug/1 95 98 80-120 3 30 2,2-Dichloropropane N.D. 1. 5 ug/1 98 100 77-124 2 30 1,1-Dichloropropene N.D. 1. 5 ug/l 96 97 80-120 0 30 ' cis-1,3-Dichloropropene N.D. 1. 5 ug/l 94 96 80-120 2 30 trans-1,3-Dichloropropene N.D. 1. 5 ug/l 97 97 79-120 0 30 Ethanol N.D. 50. 250 ug/1 138 118 54-149 16 30 Ethyl t-butyl ether N.D. 0.5 4 ug/l 91 94 76-120 3 30 Ethylbenzene N.D. 0.5 4 ug/1 98 99 79-120 1 30 Freon 113 N.D. 2. 10 ug/1 107 107 69-128 0 30 Hexachlorobutadiene N.D. 2. 5 ug/l 65 77 58-120 17 30 2-Rexanone N.D. 3. 10 ug/l 90 94 65-136 3 30 di-isopropyl ether N.D. 0.5 4 ug/l 90 92 71-124 3 30 I9opropylbenzene N.D. 1. 5 ug/l 96 98 77-120 2 30 ' p-Isopropyltoluene N.D. 1. 5 ug/1 91 93 80-120 3 30 Methyl Tertiary Butyl Ether N.D. 0.5 4 ug/l 94 97 76-120 3 30 4-Methyl-2-pentanone N.D. 3. 10 ug/1 90 93 70-121 3 30 Methylene Chloride N.D. 2. 5 ug/l 92 95 80-120 3 30 Naphthalene N.D. 1. 5 ug/1 68 70 62-120 3 30 n-Propylbenzene N.D. 1. 5 ug/1 96 98 80-120 1 30 Styrene N.D. 1. 5 ug/l 97 99 80-120 2 30 *-Outside of specification **-This limit was used in the evaluation of the final result for the blank (1)The result for one or both determinations was less than five times the LOQ. (2)The unspiked result was more than four times the spike added.