ARCHIVED REPORTS XR0001554 - Laserfiche WebLink

Home Browse Search

l Mr Michael Infurna Page 3 of 5 Drillingand Soil Sampling On August 15, 2002, V&W Drilling (C57 720904) advanced two soil borings, MW4 and MW5, which were subsequently converted into groundwater monitoring wells The locations of the borings/monitoring wells are shown on Figure 2 A hollow stem auger rig was used to advance the borings Soil samples were collected at 5 foot intervals using an 18-inch long core sampler lined with new 2-inch diameter brass sleeves, affording soil identification and subjective evaluation for contamination A photoionization detector (PID) was used to monitor the presence of volatile organic compounds in the soil Since no field evidence of contamination was noted in either boring, the soil samples collected from the capillary fringe and from the bottom of the borings were selected for analysis These samples were sealed, labeled, and immediately placed in an iced cooler and transported to Argon Laboratories (ELAP 2359) under chain of custody protocol All drilling and sampling equipment was decontaminated prior to use and between sample collection events to minimize the possibility of cross contamination Soil and rinsate generated during drilling activities was placed in DOT approved 55-gallon drums Both waste streams are currently stored on site pending disposition for proper disposal Well Construction Based on the historical range of water levels at the site (Table 3), wells MW4 and MW5 were each screened from 10 to 30 feet bgs The wells were constructed of 2-inch diameter, Schedule 40 PVC casing and 0 020 inch slotted screen The filter pack consists of#3 silica sand The annular seal in each well is constructed of 2 feet of hydrated bentomte overlain by neat cement grout Monitoring well construction details are summarized in Table 4 Boring/well construction logs are included in Attachment A Well Development and Groundwater Sampling On August 20, 2002, the wellhead elevations of the new monitoring wells were surveyed to a vertical accuracy of 0 01 feet and a horizontal accuracy of<1 meter Water levels were then monitored, and the wells were developed and sampled Prior to well development, static depth to groundwater was measured in each well Measurements are summarized in Table 3 Monitoring data sheets are included in Attachment B The new wells were then developed by surging and bailing until turbidity was minimized Temperature, pH, and electrical conductivity were measured during the well development process Purge water was placed into DOT approved 55-gallon drums, which are currently stored on site pending disposal Groundwater samples were collected from each well after appropriate groundwater recovery, were placed in a chilled ice chest and were transported under chain of custody to Argon Laboratories for . analysis Well development and purge logs are included in Attachment B G WaWGROUNDZEMOOLSEY CHT1RepoAs\WELLRPT—MW4_MW5 doe