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Lancaster <br /> Laboratories Analysis Report <br /> 2425 New Holland Pike,PO Box 12425,Lancaster,PA 17605-2425-717-656-2300 Fax:717-656-2681•www.larcasterIabs.com <br /> Page 2 of 2 <br /> Quality Control Summary <br /> Client Name: Chevron Environmental Mgt. Co. Group Number: 1084074 <br /> Reported: 04/15/08 at 08:15 AM <br /> Sample Matrix Quality Control <br /> Unspiked (UNSPK) = the sample used in conjunction with the matrix spike <br /> Background (BKG) = the sample used in conjunction with the duplicate <br /> MS MSD MS/MSD RPD BKG DUP DUP Dup RPD <br /> Analysis Name %REC %REC Limits RPD MAX Conc Conc RPD Max <br /> Batchnumber: 08092196102A Sample number(s) 5318521 UNSPK: 5318521 EKG: 5318521 <br /> Chloride 98 90-110 562,000. 524,000. 7 20 <br /> Sulfate 96 90-110 822,000. 792,000. 4 (1) 20 <br /> Nitrate Nitrogen 108 90-110 13,300. 13,400. 1 20 <br /> Nitrite Nitrogen 106 90-110 N.D. N.D. 0 (1) 20 <br /> Batch number: 08094022101A Sample number(s) 5318521 EKG: P320278 <br /> Ammonia Nitrogen 35,600. 35,100. 1 2 <br /> Batch number: 08094110101A Sample number(s) 5318521 UNSPK: 5318521 EKG: 5318521 <br /> Total Phosphorus as PO4 water 105 90-110 630. 740. 17* (1) 3 <br /> Batch number: 08095020202A Sample number(s) 5318521 UNSPK: P317694 BKG: P317694 <br /> Alkalinity to pH 8.3 N.D. N.D. 0 (1) 4 <br /> Alkalinity to pH 4.5 100 100 64-130 0 2 92,000. 94,200. 2 4 <br /> Batch number: 08095108101A Sample number(s) : 5318521 UNSPK: P320928 BKG: P320928 <br /> Kjeldahl Nitrogen 113* 90-110 1,900. 2,000. 3 (1) 20 <br /> Batch number: 080951848003 Sample number(s) : 5318521 UNSPK: P317795 BKG: P317795 <br /> Calcium 1081 -203 75-125 7 20 772,000. 755,000. 2 20 <br /> (2) (2) <br /> Iron 88 89 75-125 0 20 1,270. 1,270. 1 20 <br /> Magnesium 3978 -988 75-125 6 20 1,510,000. 1,480,000. 2 20 <br /> (2) (2) <br /> Potassium 240 (2) 201 (2) 75-125 5 20 19,500. 19,200. 2 20 <br /> Sodium 13566 3171 75-125 6 20 6,430,000. 6,630,000. 3 20 <br /> (2) (2) <br /> Manganese 136 (2) 110 (2) 75-125 3 20 4,690. 4,660. 1 20 <br /> Boron 117* 111 88-111 3 20 1,780. 1,760. 1 20 <br /> Batch number: 08098028001A Sample number(s) : 5318521 BKG: P316874 <br /> Specific Conductance 2,650. 2,650. 0 1 <br /> *-Outside of specification <br /> (1)The result for one or both determinations was less than five times the LOQ. <br /> (2)The unspiked result was more than four times the spike added. <br />