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30 September 2013 AGE Project No. 99-0559 Page 2 of 5 Extraction well pumps become active when sufficient groundwater is present in these extraction wells; presenting some non-operational time required to recharge groundwater into the extraction wells. The groundwater treatment system operates on a batch basis: approximately 80 gallons of extracted groundwater is treated and discharged, with a daily total permitted up to 7,200 gallons. Total flow (totalizer) was recorded utilizing the lnvensys PMM series one-inch inline flow meter/totalizer. The treated water (effluent) is discharged, under permit, to the City of Stockton Municipal Wastewater Facility Plant. The flow meters and LEL measuring flow and lower explosive limits were inspected and re-calibrated (monthly). The LEL and flow meter were scheduled to be calibrated by a third party agent in August 2013. A minimum of four thousand pounds of granular activated carbon, were used to treat the groundwater. 2.2. MONTHLY MONITORING PROCEDURES Monthly monitoring and sampling of influent groundwater extracted from wells EW-1 through EW-4 was performed on 24 April, 16 May and 21 June 2013. A sample of the wastewater from the air-stripper was sampled during each event to monitor the efficiency of the extraction system. Monitoring and sampling was performed to quantify the mass of contamination removed from active extraction wells. Each sample was transferred into three 40-milliliter (ml) EPA- approved volatile organic analysis (VOA) vials without preservative. Care was taken to ensure that visible air bubbles were not present in the vials after filling and capping. Groundwater sample containers were properly labeled, placed in a chilled container and transported under chain-of-custody protocols to Cal Tech Environmental Laboratories (CTEL), a California Department of Public Health-certified laboratory, for analysis. The influent groundwater samples were analyzed for the following: Total petroleum hydrocarbons quantified as gasoline (TPH-g), in accordance with EPA Method 8015 Modified; and Benzene, toluene, ethylbenzene, and xylenes (BTEX), and the fuel additive methyl- tertiary-butyl ether (MTBE) in accordance with EPA Method 8260B. The requirements of the City of Stockton discharge permit include monthly monitoring and sampling of effluent groundwater; effluent sampling was performed monthly. Each effluent sample was collected into three VOA vials and a 1-liter amber bottle without preservative. All samples were labeled with the sample location, date, time, and sampler's initials. The samples were subsequently logged on a chain-of-custody form, placed in a chilled container, and transported under chain of custody to CTEL for the following analysis: Advanced GeoEnvironmental, Inc.