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CVv...._ATC <br /> • A S S O C I A T E S I N C <br /> f <br /> On July 23, 1997, an ATC geologist supervised the advancement of five soil borings ranging in <br /> depth from 6 to 46 feet bgs The soul bonngs were advanced using a truck mounted Geoprobe® <br /> narrow diameter ng employing direct push technology Soil samples were submitted for analysis <br /> and contained detectable concentrations of petroleum hydrocarbons Site activities were <br /> summarized in ATC's Summary Report for Subsurface Investigation, dated October 20, 1997 <br /> SCOPE OF WORK <br /> Planning and Permits <br /> ATC has completed the well installation permit application for the proposed subsurface <br /> investigation The permit application and associated fees (check no 145) are attached to tins <br /> workplan ATC will also schedule field personnel and equipment, notify Underground Services <br /> Alert to locate underground utilities as required, and perform any other necessary field <br /> preparation and fob start-up activities <br /> Installation of the Soil Boring and Monitorine Well <br /> . One soil boring will be advanced in the location of the former tank pit The soil boring will be <br /> advanced employing hollow stem auger to a depth of approximately 60 feet bgs Drilling will be <br /> conducted by a State licensed (C57) drilling company A field geologist will be present to log all <br /> soil samples Descriptions of soil types encountered and sample collection intervals will be <br /> recorded on boring logs Soil samples will be collected at five-foot intervals or at changes in the <br /> lrthology Each soil sample will be field screened with a Photoioruzation Detection (PID) meter <br /> or similar instrument and at least two samples from the boring, based on field observations (t e <br /> odor, discoloration, PID readings), will be placed in a cooler with ice and subnutted for laboratory <br /> analysis The proposed boring location is shown on Figure 2 <br /> Groundwater Monitoring Well Construction Details <br /> The soil boring will be completed as groundwater monitoring well The monitoring well will be <br /> constructed of 2-inch inside diameter schedule 40 PVC well screen and casing A 0 020-inch well <br /> screen slot and #2112 mesh sand pack will be used Neat cement will be used to seal the well in <br /> accordance with California Well Standards (December 198 1) To protect the integrity of the well, <br /> a locking water-tight well plug will be installed on the well and a water-tight wellhead labeled <br /> "monitoring well" will be concreted over the well Proposed well construction details are shown <br /> on Figure 3 All drill cuttings will be stored on site in 55-gallon drums pending laboratory results <br /> Sample Analysis <br /> • Selected soil samples will be immediately placed on ice and delivered under chain-of-custody <br /> documentation to a State-certified laboratory for analysis Samples will be analyzed for total <br /> w%62577Vvportslwkpwe1 dw 2 <br />