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- - -- _ Y Monttonng well Installation Report 730 E Channel Street,Stockton,CA December 15,2004 Page 5 well-casing volumes were removed from each monitoring well during development The water purged ' from the three wells was brown and cloudy, and did not clear during development A moderate petroleum odor was noted in the groundwater purged from monitoring well MW-2 during well development No petroleum odor was noted in the groundwater purged from monitoring wells MW-1 and MW-3R during well development The purge water discharged from the wells during development was placed in 55-gallon drums, labeled, and left on Site to await disposal Groundwater Well ' Development Field Forms are included in Appendix C - _37 WELL CASING SURVEY I Following installation of the monitoring wells, the wells were surveyed to determine the location and elevation of the well collars in order to comply with AB2886 (Water Code sections 13195 — 13198) The well collars were surveyed with a vertical accuracy of 0 01 foot to a NGVD29 vertical datum and with a horizontal accuracy of 0 10 foot to a NAD83 horizontal datum The measuring point for water-level measurements was marked on each well collar Monitoring well survey details are presented in Table 2 The well survey data has been submitted to the State Water Resources Control Board in Electronic z Deliverable Format (EDF) as required by AB 2886 A well survey report is included in Appendix B ITable 2 Monitoring WeII Survey Details Monitoring Well Northing Easting Elevation MW-1 2171471 84 6336283 52 1635 MW-2 2171435 42 6336319 27 1652 0 MW-3R 2171489 23 6336314 94 1578 38 GROUNDWATER SAMPLING On November 8, 2004, a Condor representative was on Site to measure water levels and collect groundwater samples from monitoring wells MW-1, MW-2, and MW-3R All down-hole field equipment - -was decontaminated in the field with a solution of laboratory-grade, non-phosphate detergent and deionized water and double-nnsed with deionized water prior to use in each well All field instruments were calibrated to the manufacturer's recommended standards The water level in the monitoring wells ' was measured to the nearest 0 01 foot with a battery-operated, flat-tape, water level meter A new, disposable, polyethylene bailer was lowered into each well to collect a field-inspection sample The bailer sample was inspected for floating product, sheen, discoloration and odor Floating product was not I observed in any of the inspection samples from the monitoring wells A moderate petroleum odor was noted in the inspection sample from monitoring well MW-2 Monitoring wells MW-1, MW-2, and MW-3R were purged with disposable, polyethylene bailers until approximately three well casing volumes of groundwater were removed and the electrical conductivity, pH, and temperature of the purged water stabilized The purge water was discharged to 55-gallon drums, labeled, and left on Site to await disposal Groundwater Monitoring Field Forms are included in Appendix C Groundwater samples were collected from monitoring wells MW-1, MW-2, and MW-3R by filling I laboratory-supplied containers directly from disposable, single—use polyethylene bailers equipped with a bottom-emptying device The filled sample containers were labeled, placed in a cooler chilled with Blue ice®, and delivered under chain-of-custody procedures to Argon a4 I �t� CONDOR