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Lancaster1 sis Report Laboratories Ana y p 2425 New Holland Pike,PO Box 12425,Lancaster,PA 17605-2425•717-656-2300 Fax:717-656-2681•www.lancasterlabs.com Page 3 of 5 Quality Control Summary Client Name: Chevron Environmental Mgmt Co Group Number: 1203973 Reported: 09/14/10 at 02:00 PM Sample Matrix Quality Control Unspiked (UNSPK) = the sample used in conjunction with the matrix spike Background (BKG) = the sample used in conjunction with the duplicate MS MSD MS/MSD RPD BKG DUP DUP Dup RPD Analysis Name %RBC RBC Limits RPD MAX Conc Conc RPD Max Batch number: 102030012A Sample number(s) : 6037217-6037222 UNSPK: 6037220 TPH-DRO water C10-C25 74 93 19-173 22* 20 Batch number: 102031848002 Sample number(s) : 6037220 UNSPK: P037945 BKG: P037945 Boron 100 100 88-111 0 20 981 969 1 20 Calcium 148 (2) 89 (2) 75-125 2 20 111,000 109,000 2 20 Iron 106 106 75-125 0 20 N.D. N.D. 0 (1) 20 Magnesium 171 (2) 71 (2) 75-125 4 20 54,500 54,000 1 20 Manganese 101 102 75-125 0 20 225 223 1 20 Potassium 106 104 83-123 1 20 4,400 4,420 1 20 Sodium 102 (2) 66 (2) 75-125 2 20 176,000 166,000 6 20 Batch number: 10202196601A Sample number(s) : 6037220 UNSPK: P037129 BKG: P037129 Chloride 105 90-110 101,000 101,000 0 20 Nitrate Nitrogen 104 90-110 N.D. N.D. 0 (1) 20 Nitrite Nitrogen 97 90-110 N.D. N.D. 0 (1) 20 Sulfate 102 90-110 91,900 88,300 4 (1) 20 Batch number: 10203110101A Sample number(s) : 6037220 UNSPK: 6037220 BKG: 6037220 Total Phosphorus as PO4 water 99 90-110 2,700 2,700 0 3 Batch number: 10210108101A Sample number(s) : 6037220 UNSPK: 6037220 BKG: 6037220 Kjeldahl Nitrogen 108 90-110 540 560 4 (1) 20 Batch number: 10203022101A Sample number(s) : 6037220 BKG: P038384 Ammonia Nitrogen 26,000 26,000 0 2 Batch number: 10204020201B Sample number(s) : 6037220 UNSPK: P037129 BKG: P038510 Alkalinity to pH 4.5 102 101 73-121 0 5 90,700 93,300 3 5 Alkalinity to pH 8.3 N.D. N.D. 0 (1) 5 Batch number: 10204021201B Sample number(s) - 6037220 UNSPK: P037255 BKG: 6037220 Total Dissolved Solids 102 62-135 1,280,000 1,310,000 2 9 Batch number: 10204028001A Sample number(s) : 6037220 BKG: 6037220 Specific Conductance 1,960 1,960 0 1 Surrogate Quality Control Surrogate recoveries which are outside of the QC window are confirmed unless attributed to dilution or otherwise noted on the Analysis Report. Analysis Name: VOCs 25 ml purge 8260 Batch number: C102041AA Dibromofluoromethane 1,2-Dichloroethane-d4 Toluene-d8 4-Bromofluorobenzene 6037216 100 102 101 101 6037217 100 102 101 100 6037218 101 101 100 100 *-Outside of specification (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.