ARCHIVED REPORTS XR0011228 - Laserfiche WebLink

Home Browse Search

July 27,2001 Project No 2005-2050-01 page 4 • Groundwater samples were collected using the HydropunchTm technique Water samples were collected by pushing the HydropunchTM sampler with 2-inch diameter steel rods to the bottom of the borehole The CPT operator subsequently pulled up on the steel rods, exposing a 4-foot long PVC screen at the desired sampling interval Samples were collected by lowering a metal bailer within the steel rods Groundwater was collected in the bailer and placed in glass sample containers containing a hydrochloric acid preservative Following collection, the samples were placed in an ice-chilled cooler Each sample was appropriately labeled and identified on a chain-of-custody form Groundwater sampling intervals are included on the borehole sampling logs presented in Appendix B Soil samples were collected by driving a 1 7-inch diameter sampler equipped with two pre-cleaned 1 25-inch diameter by 6-inch long brass sleeves into undisturbed soil Additional sleeves of soil collected at each sampling interval were field screened for volatile organic compounds using a photoionization detector (PID) The soil samples were also classified using the Unified Soil Classification System The lowermost intact sample from each interval was retained for possible analysis The sample ends were covered with Teflon TM sheets and tight fitting plastic caps Once labeled and sealed, the samples were placed in an ice-chilled cooler Each sample was identified on a chain-of- custody form which followed the sample to the analyzing laboratory Soil sampling intervals, soil descriptions, and PID readings are included on the borehole log presented • in Appendix B Gregg Drilling and Testing, Inc was unable to advance the soil and groundwater samplers to the desired depths in all borings The groundwater sampler encountered refusal at 52 feet bgs at CPT-9 and 113 feet at CPT-10 The soil sampler encountered refusal at 113 feet bgs at CPT-10 and at 83 feet bgs at CPT-12 At CPT-6, the soil sampler was broken at 131 feet bgs The bong was subsequently terminated At CPT- 11, the soil sampler was broken at 127 feet bgs An additional borehole was advanced directly adjacent to the other three boreholes to collect soil samples at 130 and 139 feet bgs GROUNDWATER MONITORING WELL INSTALLATION Gregg Drilling and Testing, Inc advanced three soil bongs using 8-inch diameter hollow stem augers to depths ranging from approximately 110 to 115 feet bgs under the direction of a Stratus geologist The soil borings were converted to 2-inch diameter groundwater monitoring wells (MW-10 through MW-12) The locations of the wells are shown on Figure 2 Monitoring wells MW-10 and MW-11 were constructed using 10 feet of 0 02-inch diameter factory slotted PVC casing set from approximately 99 5 to 109 5 feet bgs Monitoring well MW-12 was constructed using 15 feet of 0 02-inch diameter factory slotted PVC casing and set from approximately 100 to 115 feet bgs A filter pack of#3 Monterrey sand was placed in the annular space around the well from the bottom of the well screen to 1 5 to 2 5 feet above the top of the well screen Two to three feet of bentonite was placed on top of the filter pack to provide a sanitary seal for the C Traject Files\Apache Plashcs\Reports\Apache Soil&GW 072001A doe