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KI FINFELDER 6 SEMI-ANNUAL GROUNDWATER SAMPLING ' 6.1 MEASUREMENT OF WATER LEVELS ' In order to assess the groundwater gradient at the time of sampling, water level measurements were made in each monitoring well at the beginning of the sampling round, prior to purging and sampling the wells The depth-to-water was measured in each well according to the protocol ' described in Appendix A, Section A4 1 The depth-to-water measurements were then converted to relative groundwater elevations with respect to mean sea level or a local benchmark by subtracting them from the surveyed casing elevations ' The resulting groundwater elevations were calculated to assess the direction of the groundwater gradient at the time of sampling This inform.-tion was then used to evaluate which wells ' represent upgradient and which wells represent downgradient groundwater conditions Water levels were measured on July 7, 2000 prior to purging and sample collection of monitoring wells at the subject site Groundwater flow on this date was approximately to the northeast at a gradient of 0 005 ft/ft Past groundwater surveys have shown that groundwater flow direction and gradient is relatively consistent Groundwater gradients have ranged from 0 004 to 0 010 ft/ft For a summary of past groundwater elevations and associated data please refer to Table 3 Pumping influences and seasonal groundwater fluctuations may also affect groundwater flow and ' gradients 6.2 COLLECTION OF GROUNDWATER SAMPLES ' A total of 3oundwater les were collected on July 7, 2000 The 3 groundwater samples �' samples were collected from monitoring wells MW-1, MW-2 and MW-3 (see Plate 1) The wells were ' purged and sampled using disposable bailers as generally described in Appendix A 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 The drums were stored at the site In the yard area 6.3 SAMPLE HANDLING ' After collection, the groundwater samples were labeled, logged on a chain-of-custody form, and immediately stored in an iced cooler The samples were transported under chain-of-custody control to Kleinfelder's office and then transported by couner in a chilled ice chest to APPL Laboratories APPL is certified by the California Department of Health Services (DHS) to c perform the requested analyses 20-4439-01 E01/2000R726 Page 10 of 17 Copynght 2000 Kleinfelder Inc October 16,2000 1