ARCHIVED REPORTS_XR0007453 CASE 1

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' k'" KLEINFEL © ER 4.3 MONITORING WELL DEVELOPMENT AND SURVEYING ' At least 24 to 48 hours after installation, the three monitoring wells were developed to remove sediment-laden water and to increase the hydraulic radius of the well Development was performed using a pneumatic development pump and as described in Appendix B, Sections B- ' 3 2 through B-3 3 The three new monitoring wells, MW-2, MW-3 and MW-4 and the existing monitoring well MW-lwere surveyed on January 7, 2002 by Morrow Surveying of West Sacramento Vertical measurements were surveyed to the nearest 1/100' of a foot with reference ' to the City of Lodi benchmark No 252 The measuring point for each well is the north side of the top of the PVC casing pipe ' 4.4 MEASUREMENT OF WATER LEVELS ' A water level measurement was made in each of the four monitoring wells at the beginning of the sampling round prior to purging and sampling of the wells The depth-to-water was measured in each well according to the protocol described in Appendix B, Section B-4 The depths to water, measuring from the north side of the top of the PVC pipe, ranged from 34 95 to 35 91 feet (see Table 2) The depth-to-water measurements were converted to groundwater elevations and groundwater flow direction and gradient was calculated Groundwater flow was ' found to be to the southwest with a gradient of 0 003 ft/ft (see Plate 2) 4.5 COLLECTION OF GROUNDWATER SAMPLES A total of four groundwater samples were collected on January 11, 2002 The groundwater ' samples were collected from monitoring wells MW-1 through MW-4 The wells were purged and sampled using disposable bailers as generally described in Appendix B A transparent disposable bailer was partially submerged into the groundwater prior to purging each ' monitoring well to assess the groundwater for a potential sheen and/or floating product No floating product was observed, although a sheen was noted in MW-1 along with a slight odor There was no sheen, nor odor, observed in groundwater from the three other monitoring wells ' Copies of the monitoring well sampling logs are included in Appendix C Purge water from the monitoring wells was stored on site in labeled 55-gallon drums pending ' chemical analysis and disposal by the client 4.6 SAMPLE HANDLING 1 After collection, the soil and groundwater samples were labeled, logged on a chain-of=custody, 1 and immediately stored in an iced cooler The samples were transported under cham-of- custody control to Klemfelder's office and then transported by courier in a sealed container to Alpha Analytical of Sparks, Nevada for chemical analysis Alpha Analytical is certified by the California Department of Health Services to perform the requested analyses 20-1417-16 E04/ST02R038 Page 8 of 18 ©2002 Klemfelder,Inc June 7,2002