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-C'"'(VVAT1 <br /> ASSOC IATCS INC <br /> fl--groundwater Wells MW-2 and MW-3 contained detectable levels of petroleum hydrocarbons A <br /> program of quarterly groundwater monitoring and sampling was initiated in March 1994 <br /> iIn August 1995, Smith Technology conducted a subsurface site investigation to further define the <br /> extent of impacted groundwater at the site Smith Technology supervised the installation of <br />' monitoring wells MW4, MW-5 and MW-6 These three new wells were developed and sampled <br /> along with monitoring wells MW-1, MW-2, and MW-3 Analytical results of groundwater samples <br /> from the six monitoring wells indicated the presence of elevated concentrations of petroleum <br /> ihydrocarbons in the vicinity of wells MW-3 and MW-6, on the northeast corner of the site <br /> 2.0 METHODS AND PROCEDURES <br /> To evaluate the extent of residually petroleum Y impacted etroleum h drocarbon acted soil at the site, a total of <br /> P <br /> three soil bonngs were advanced at the site All field activities were performed in accordance <br /> with Smith Technology's Workplan for Subsurface Investigation, dated May 3, 1996, and <br /> subsequent addendums dated May 15, 1996, January 15, 1998, and October 26, 1998 The scope <br /> of work was approved with minor modifications by Mr Ron Rowe of PHS/EHD <br /> 22.1 Drilling Activities <br /> On November 5, 1998, ATC personnel supervised advancement of three soil borings, SBI <br /> through SB3, at the site to depths ranging from approximately 31 5 to 50 feet bgs to evaluate the <br />' horizontal and vertical extent of petroleum hydrocarbon impacted soil and groundwater and to <br /> determine and define soil stratigraphy The soil boring locations are shown on Figure 2 <br />' 2_2 Soil Samuline and Analysis <br /> Drilling was conducted by V&W Drilling (State C57 license no 720904) utilizing a hollow stem <br /> auger drill ng Soil boring SB 1 was advanced using continuous core methodologies to collect <br /> undisturbed soil samples and obtain more exact lithological data The soil samples from soil <br /> bonngs SB2 and SB3 were collected at five foot intervals or significant changes in lithology A <br />' field geologist logged all soil samples utilizing the Unified Soil Classification System <br /> Descnptions of soil types encountered and sample collection intervals are included on the boring <br /> logs (Appendix A) <br /> The were characterized for soil type, moisture content and visual evidence of <br /> soil samplesYP , , <br /> petroleum contamination A photoionization detection meter (PID) was used as a field screening <br />' device for the detection of petroleum hydrocarbon vapors in soil samples Drill cuttings were <br /> stored on site in 55-gallon DOT approved steel drums pending disposal After samples were <br />' collected, the soil bonngs were grouted to the surface with a bentonite grout mixture <br /> 1p Soil samples were immediately placed on ice and selected soil samples were analyzed by Sequoia <br /> Analytical (ELAP #1210) of Redwood City, California for total petroleum hydrocarbons as <br /> w 1626051report9\sum doc 2 <br />