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31 FIELD SERVICES AND LABORATORY ANALYSIS Geocon performed groundwater monitoring and sampling on April 1, 2003 and July 2, 2003 to determii.e water table elevation and the distribution of dissolved hydrocarbons in groundwater monitoring wells Four domestic wells (three offsite and one onsite) were sampled to determine if potable water supplied to adjacent residents and the Site are impacted with petroleum hydrocarbons ' Domestic well DW-1 is sampled monthly to monitor for the presence of petroleum hydrocarbons ' Monthly operation and maintenance (O&M) services were performed for the SVE and ozone infection systems 31 Water Table Elevations And Gradient On April 1 and July 2, 2003, Geocon personnel measured the depth to water in each of the ten Site- related groundwater monitoring wells (Table 1) A water level indicator was used to gauge the wells to the nearest 0 01 foot A groundwater elevation contour map indicates that groundwater flow was generally toward the south at gradients of 0 003 ft/ft in April (Figure 4a) and 0 002 ft/ft in July I (Figure 4b) Groundwater monitoring data is presented in Table 1 32 4uarterly Groundwater Sampling Groundwater monitoring wells were purged using a submersible pump until pH, temperature, and conductivity readings had stabilized Temperature, conductivity, and pH readings were recorded in the wells, at regular purge intervals of one casing volume, with a portable instrument that was calibrated before the wells were purged Water purged from the wells was stored in a 500-gallon ' above ground storage tank within the remediation system compound On June 25, 2003, Phillips Transportation transferred the purge water into a portable tank on their vehicle and transported the ' water offsite for appropriate disposal Domestic wells were purged by turning on the water at the well, draining the well's holding tank and filling the tank with fresh water froin the aquifer Once the tank had been recharged, water samples weie collected directly from a spigot at the holding tank DW-211, DW-3, and DW-4 are sampled ' quarterly and DW-1 is sampled monthly Access was denied to monitoring well MW-7 and domestic well DW-3, no samples were collected ' While purging well MW-51) the purge pump became lodged inside the well casing The pump could not be recoveied and the well could not be purged, no sample was collected The gi oundwater monitoring wells were re-monitored to verify at least 80% recovery prior to sample collection Adequate recovery was observed in the purged wells prior to sampling A disposable bailer was used to collect the groundwater samples All samples were collected in appropriate . Containers, preserved with ice, and transported under chain-of-custody protocol to Advanced 58643-06-01 4- July 25,2003 i