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18 November 2003 AGE-NC Project No 95-0128 Page 2of7 2 12 Ground Water Extraction System Water Sampling Procedures Between late March and mid-September 2003, AGE collected water samples from valved ports located upstream (Influent) and downstream (effluent) of the treatment unit The influent samples were collected in laboratory-supplied 40-m1 EPA-approved volatile organic analysis (VOA) vials containing 0 5 ml 18%hydrochloric acid as a sample preservative, and 1-liter amber bottles without preservative Effluent samples were collected in the same containers and into 500-milliliter plastic bottles without preservative Care was taken to ensure that visible air bubbles were not present in the vials after filling and capping Water sample containers were labeled with the sample designation,date time and sampler's initials p p � � P Subsequently,the samples were logged on a chain-of-custody form,placed in a chilled container and transported to McCampbell Analytical Inc (MAI) The samples were analysis for • Total petroleum hydrocarbons quantified as gasolene and as diesel (TPH-g and TPH-d) by IEPA Method 801- Modified, and • Benzene, toluene, ethyl benzene and xylene (BTEX) and fuel additives di-isopropyl ether lie (DiPE),ethyl tertiary-butyl ether(ETBE),methyl tertiary-butyl ether(MTBE)In accordance with EPA Method 8020 or 8250B • In addition, to satisfy SPWD Industrial Wastewater Discharge Permit No 01, the pH of Ieffluent water samples were analyzed in accordance with EPA Method 150 1 2 2 GROUND WATER MONITORING AND SAMPLING On 02 and 03 October 2003, a ground water monitoring and sampling event was conducted on the ' monitoring well network I2 2 1 Ground Water Monitoring and Purging On 02 October 2003, a Solinst water level meter was used to measure the depth to ground water in monitoring wells MW-1 through MW-18 and vapor well VW 1 The ground water elevation in each well was calculated by subtracting the measured depth to ground water from the surveyed casing elevation (Table 2) On 02 and 03 October 2003, a mimmum of 3 casing-water volumes were purged from each well to be sampled using a PVC submersible two-stage pump or disposal bailer, except for well MW-9, which was purged dry prior to the removal of the 3 volumes Temperature,pH and conductivity of . purged ground water were measured at various intervals,depending on the volume of water in each Advanced CeoEnvvonenental Inc I