Laserfiche WebLink
BC&D Properties <br /> Report, MW Installation and Monitoring <br /> Project No. 8.1.2 <br /> December 17, 1992 <br /> ++ Page 7 <br /> 5.3 Soil Sampling <br /> Soil samples were collected continuously from a depth of five feet and at the <br /> capillary fringe to characterize the sediment type and for laboratory analysis. <br /> Brass sample tubes were sealed with aluminum foil, capped, labeled and placed <br /> in a cooler at 4° Celsius for transport to GeoAnalyticaI Laboratories, Modesto. <br /> 5.4 Disposition of Soil Boring Cuttings <br /> Soil cuttings from MW-4 were spread out in the vacant field to the west of the <br /> building. <br /> 5.5 Monitoring Well Design <br /> The monitoring well was completed to at least 10 feet below the water table. The <br /> wells were constructed with 2 inch threaded-joint PVC pipe (schedule 40) that is <br /> perforated from the bottom of the well to approximately 5 feet above the water <br /> table. Number 3 sand was used to create a filter pack that extends from the <br /> bottom of the well to 2 feet above the screened interval. Two feet of granular <br /> bentonite was placed above the filter pack in the annular space and hydrated <br /> with tap water. Above the bentonite, is a cement/bentonite (96/4%) grout <br /> installed to the ground surface. The monitoring well was secured with a surface <br /> �. seal obtained by cementing in a traffic safe well box and a water tight locking cap. <br /> A construction schematic of the monitoring well is shown in Figure 2. <br /> �- 5.6 Monitoring Well Development <br /> The monitoring wells were developed before water samples were collected. This <br /> was accomplished by pumping until clear groundwater was obtained and then <br /> removing an additional 5 well volumes. One well volume is the water <br /> contained in the well casing and the filter pack. The extracted groundwater was <br /> stored in 55-gallon drums to be disposed of properly at a later date. <br /> 5.7 Groundwater Sampling <br /> If it had been over 24 hours since the monitoring well was developed, stagnate <br /> water was purged before sampling the groundwater. A travel blank was <br /> provided by the Laboratory and blanks were collected before sampling to ensure <br /> bailer and/or pump cleanliness. Water samples were collected by using a Teflon <br /> bailer. <br />