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1 <br /> 4.3 MONITORING WELL DEVELOPMENT AND SURVEYING <br /> At least 24 to 48 hours after installation, the monitoring well (MW-1) was developed to remove <br />' sediment-laden water and to increase the hydraulic radius of the well Development was <br /> performed using a pneumatic development pump and as described in Appendix B, Sections B-3 2 <br /> through B-3 3 <br />' Because a single monitoring well is not sufficient to assess groundwater flow and gradient, MW-1 <br /> will not be surveyed until additional wells, if needed, are installed in the future <br />' 4.4 MEASUREMENT OF WATER LEVELS <br /> A water level measurement was made in monitoring well (MW-1) at the beginning of the <br /> sampling round prior to purging and sampling the well The depth-to-water was measured in <br /> well MW-1 according to the protocol described in Appendix B, Section B-4 The depth-to- <br /> water measurements, at this time, will be utilized only to assess the approximate depth to <br /> groundwater, since one well is not sufficient to assess groundwater flow and gradient The <br /> groundwater depth measured from the top of casing (approximately ground surface) was <br /> approximately 34 04 feet bgs <br /> 4.5 COLLECTION OF GROUNDWATER SAMPLES <br /> A total of one groundwater sample was collected on June 6, 2000 The groundwater sample <br />' was collected from monitoring well MW-1 (see Plate 1) The well was purged and sampled <br /> using a disposable bailer as generally described in Appendix B A transparent disposable bailer <br /> was partially submerged into the groundwater prior to purging the monitoring well to assess the <br />' groundwater for a potential sheen and/or floating product No product was observed although a <br /> sheen was noted A copy of the monitoring well sampling log is included in Appendix D <br /> Purge water from the monitoring well was stored on site in labeled 55-gallon drums pending <br /> chemical analysis and disposal by the client <br /> 4.6 SAMPLE HANDLING <br /> After collection, the soil and water samples were labeled, logged on a chain-of-custody, and <br />' immediately stored in an iced cooler The samples were transported under chain-of-custody <br /> control to Kleinfelder's office and then transported by courier in a sealed container to Sequoia <br /> Analytical of Sacramento, California for chemical analysis Sequoia is certified by the <br />' California Department of Health Services to perform the requested analyses <br />' 20-1417-16 E02/2000R578 July 28, 2000 <br /> © 2000 Kleinfelder, Inc Page 6 of 1 i <br /> h! f m F4 17rk 28 2 i 1 Isl Pvl)rlk 5,W(t 51r)( Ion ( 1 �)i_'Ui- 1.—`1 1 (209) 948-1 i 4 2110] ')18-1V'21 I�� <br />