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:File No. 20-3937-01 h4 KLEINFELDER <br /> September 3, 1996 <br /> The groundwater samples were submitted to Sequoia Analytical and analyzed for: <br /> • Volatile Organic Compounds (VOCs) including Benzene, Toluene, Ethylbenzene, <br /> Xylenes (BTEX) by EPA Method 8260 <br /> + Total Purgeable Petroleum Hydrocarbons as Referenced to Gasoline in the approximately <br /> C6 to C12 carbon range (TPH-G) by EPA Method 8015M/5030 <br /> • Total Extractable Petroleum Hydrocarbons (Fuel Fingerprint) in the approximately C8 to <br /> C2; carbon range by EPA Method 8015M/3550 <br /> • Sulfate by EPA Method 375.4 <br /> Sulfate was detected in the three groundwater samples obtained in concentrations ranging <br /> from 28 - 40 mg/1. There is no maximum contaminant level (MCL) expressed in Title 22 of <br /> the California Code of Regulations (22CCR). However, there are Secondary MCLS expressed <br /> in 22CCR §64449. Tlie secondary MCLS (SMCLs) are 250 mg/l, recommended; 500 mg/l, <br /> upper; and 600 mg/l, short term. <br /> The only EPA Method 8260 analyte detected in any of the three groundwater samples <br /> obtained, was 18 pg/1 (a.k.a. parts per billion or ppb) of I,1-Dichloroethylene in the sample <br /> obtained from monitoring well MW-2. The concentration exceeds the maximum contaminant <br /> level of 0.006 nig/I (6.0 pg/1) expressed in'22CCR §64444. Additionally, 56 µg/l of T.PH- <br /> Unidentified Extractable Hydrocarbons (in the C 10 to C24 carbon range) was detected in the <br /> groundwater sample obtained from monitoring well MW-2. No TPH-U.EH was detected in <br /> any of the other groundwater samples obtained. Additionally, there is no MCL or SMCL for <br /> TPH-UEH in 22CCR. <br /> �i <br /> 20-3937-OIIMR960189 Page 12 of 18 01996, Klelnfelder,Inc. <br />