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4 A Quarterly Monitoring and Sampling Report(Ql 20 01) d Ranch Market 23569 Santa Fe Road Riverbank California February lG 2001 After review of the confirmation samples, the San Joaquin County Environmental Health Department (SJCEHD) requested the well be brought online On January 18, 2001, SECOR met with Mr Michael Infurna with SJCEHD for the final inspection of well DW-2R The water service from the Aero Pure Water supply tank was disconnected and the water valve was opened, allowing DW-2R to supply water to the home on the Pantoja Property Groundwater Monitorin Water Table Elevations and Gradient On January 3, 2001, SECOR personnel measured the depth to water in each of the ten site- related groundwater monitoring wells (Table 3) A water level indicator was used to gauge the wells to the nearest 0 01 foot A groundwater elevation contour map, prepared from the data collected on January 3, 2001, indicates that groundwater flow is generally toward the south at a gradient of 0 003 ft/ft (Figure 4) Current and histoncal groundwater monitoring data are summarized in Table 3 Separate-Phase Petroleum Thickness Well gauging and sampling efforts on January 3, 2001, did not detect separate-phase petroleum hydrocarbons (SP) in any of the wells monitored (Table 3) Historically, SP has not been present • in the groundwater monitoring wells at the site Groundwater Samnline Well Purging On January 3, 2001, groundwater monitoring wells were purged using a submersible pump and disposable bailers until pH, temperature, and conductivity readings had stabilized Temperature, conductivity, and pH readings were recorded in the ten wells, at regular purge intervals of one casing volume, with a portable instrument that was calibrated before the wells were purged On January 3, 2001, MW-7 was blocked and could not be purged Water purged from the nine groundwater monitoring wells was stored in drums on site, pending characterization and disposal Groundwater Sampling Procedures The groundwater monitoring wells were re-monitored to verify at least 80% recovery prior to sampling Adequate recovery was observed in the purged wells prior to sampling A grab sample was collected from MW-7 on January 11, 2001, as access to the well was blocked January 3, 2001 A disposable bailer was used to collect the groundwater samples All samples were collected in appropriate containers, preserved on ice, and transported under chain-of- custody manifest to Kiff Analytical LLC located in Davis, California File Riverbank 01 1Q