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lilt <br /> . ASS O C I ATE S I N C . <br /> After presenting the results of the soils investigation to PHS/EHD in a report prepared by <br />' Helmick and Lerner Inc. titled Preliminary Site Assessment- Stagg High School dated September <br /> 23, 1997, PHS/EHD requested additional work at the site. <br /> Helmick and Lerner Inc. subsequently submitted a workplan titled Work Plan for Installation of <br /> Monitoring Well, Stagg High School - Stockton Unified School District dated February 6, 1998. <br /> The workplan purposed methods and procedures evaluate groundwater for the presence of <br /> petroleum hydrocarbons with the installation of a single monitoring well. This workplan was <br /> approved by PHS/EHD, in correspondence dated March 25, 1998. <br /> 2.0 . METHODS AND PROCEDURES <br /> To evaluate the presence of petroleum hydrocarbons in groundwater, one soil boring was <br /> advanced in the vicinity of the former USTs and completed as a groundwater monitoring well. <br />' All field activities were performed in accordance with Helmick and Lerner's Work Plan for <br /> Installation of Monitoring Well, Stagg High School - Stockton Unified School District dated <br /> February 6, 1998 and ATC's Site Safety Plan and Quality Assurance/Quality Control Plan <br /> M (QA/QC Plan) submitted to PHS/EHD on February 1, 1999. <br /> 221 Soil Boring Advancement and Sampling <br />' Drillingwas conducted on February 25 1999 b V & W Drilling State C57 license no. 720904 <br /> �Y Y g ( ) <br />' utilizing a hollow stem auger drill rig. The soil samples from soil boring MW1, advanced to <br /> 24.5 feet bgs, were collected at five-foot intervals or significant changes in lithology, using a 2- <br /> inch diameter split-spoon sampler containing three brass tubes. A field geologist logged drill <br /> cuttings and soil samples utilizing the Unified Soil Classification System. <br /> The drill cuttings were characterized for soil type, moisture content, and visual evidence of <br />' petroleum hydrocarbons. A flame ionization detection meter (FID) was used as a field-screening <br /> device for the detection of petroleum hydrocarbon vapors in drill cuttings and cored samples. <br /> Drill cuttings were temporarily stored on site in 55-gallon DOT approved steel drums. <br />' Descriptions of soil types encountered and sample collection intervals are included on the <br /> boring/well construction log contained in Appendix B. Soil boring MW 1 was advanced and <br /> completed as a groundwater monitoring well. <br /> 222 Soil, Sample Analysis <br /> _ p... <br /> Selected soil samples were placed on ice, and transported under chain-of-custody to Sequoia <br /> Analytical (ELAP #1210) of Redwood City, California for analysis. All soil samples were <br /> analyzed for total petroleum hydrocarbons as gasoline (TPHg) and benzene, toluene, <br /> ethylbenzene, and xylenes (BTEX) utilizing EPA 8015 and 8020 methodologies, and oxygenate <br /> w:1172921repom\sumwe1.doc 2 <br />