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1 IVY TC <br /> A S S O C I A T E S I N C <br /> On July 13, 1998, a geologist from ATC Associates supervised the advancement of four soil <br /> borings to 26 to 31 feet bgs Analytical results of soil samples indicated the presence of <br /> ' petroleum hydrocarbons One groundwater sample was collected from each boring at the depth <br /> groundwater was first encountered Groundwater samples indicated the presence of petroleum <br /> hydrocarbons Results are summarized in ATC's Summary Report of Additional Subsurface <br /> 1 Investigation, dated September 9, 1998 <br /> On February 18, 1999, a geologist from ATC Associates supervised the installation of three <br /> ' groundwater monitoring wells from 39 to 41 feet bgs Soil bonngs MW 1, MW2, and MW3 were <br /> completed as two-inch monitoring wells One soil sample from each bonng was collected and <br /> after the groundwater monitoring wells were developed on groundwater sample was collected <br /> 1 from each well Soil and groundwater samples contained detectable concentrations of petroleum <br /> hydrocarbons Results are summarized in ATC's Summary Report of Additional Subsurface <br /> Investigation, dated June 1, 1999 <br /> 2.0 METHODS AND PROCEDURES <br /> ' To evaluate the extent of impacted groundwater and determine the groundwater gradient at the <br /> site, six soil borings were advanced near the perimeter of the site and one soil boring was <br /> advanced in the vicinity of the former USTs All field activities were performed in accordance <br /> ` with ATC's Workplan for Additional Subsurface Investigation at N&S Irrigation, 215 West Main <br /> Street, Ripon, California, dated May 9, 2001 This workplan was approved by PHS/EHD on <br /> 1 May 21, 2001 <br /> 221 Soil Boring Advancement and Sami,ling <br /> 1 Drilling was conducted on September 12 and October 4 and 5, 2001 by Fisch Environmental <br /> (State C57 license no 683865) employing direct push technology (DPT) utilizing a truck <br /> 1 mounted Geoprobe® soil probing unit to first encountered groundwater, approximately 27 feet <br /> bgs The soil samples from soil borings SB7, SBS, SB9, SB 10, SB 11, and SB 12 were collected <br /> at five-foot intervals An ATC field geologist logged drill cuttings and soil samples utilizing the <br /> Unified Soil Classification System <br /> On September 12 soil borings SB7, SB8, SB9, SB 10, and SB11 were advanced until probe <br /> refusal was encountered, approximately 20 to 25 feet bgs Because of the probe refusal, only soil <br /> samples were collected from the borings at this time Soil boring SB 12 was drilled on October 4, <br /> ' 2001 because it had to be relocated due to the proximity to underground utilities <br /> The soil samples were characterized for soil type, moisture content, and visual evidence of <br /> petroleum hydrocarbons A photoionization detection meter (PID) was used as a field-screening <br /> device for the detection of petroleum hydrocarbon vapors in the samples Descriptions of soil <br /> types encountered and sample collection intervals are included on the boring logs contained in <br /> Appendix A <br /> w\14981\reporu\Add_1nv doc 2 <br />