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Quarterly Groundwater Monitoring Report,January-March 1995 2 Manna Pro,4004 South El Dorado, Stockton, CA April 17, 1995 ■ submittal of the groundwater extraction and treatment system design to the San Joaquin County PHS Groundwater Monitoring Data On January 30, 1995, 10 existing groundwater monitoring wells were monitored for depth to water (DTW) DTW measurements were also taken from the groundwater extraction well (EW-1) and the three observation wells (013-1, OB-2, and 013-3) The DTW measurements were taken from surveyed points at the top of each well casing, which are referenced to an arbitrary datum (designated as 15 feet) The groundwater elevations this quarter increased an average of 3 11 feet since the October 1994 elevations were measured The results of groundwater monitoring are included in attachment 2, table 1 A potentiometric surface map, as interpreted from the data in table 1, is presented in figure 1 The groundwater elevation data collected from MW-1 was not used in the construction of the potentiometric surface map since it is believed not representative of the water level elevation conditions in the area As shown in figure 1, the average groundwater gradient in the site vicinity is approximately 0 005 foot/foot radiating from the area of former excavation The groundwater flow direction radiates from the former excavation area in a north-northwest direction Groundwater Quality Data The 10 monitoring wells were sampled on January 30, 1995 Before sampling, the static water in the well was purged to collect samples representative of aquifer conditions The pH, temperature, and conductivity were measured with a YSI 3650 meter during purging Equipment was cleaned after each sample was collected, using an Alconox and water solution and rinsed with de-ionized water Three well-casing volumes of groundwater were purged from the wells or purged until the well became dry The wells were allowed to recharge to approximately 80 percent of static water level before samples were collected Samples were collected using well dedicated, polyurethane, disposable bailers and placed into sample containers supplied by the laboratory performing the analyses Samples were labeled, placed in an Ice-chilled insulated chest and transported to GTEL Environmental Laboratones, Inc in Concord, California, accompanied at all times by a chain-of-custody record A trip blank was also collected and accompanied the samples for quality assurance and control 009OF4025 202 GROUNDWATER E2MTECHNOLOGY, INC