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� v <br /> o <br /> ASSOC IATES INC <br /> After presenting the results of the soils investigation to PHSIEHD in a report prepared by <br /> Helmick and Lerner Inc titled Preliminary Site Assessment for Underground Storage Tank, <br />' Stockton Unified School District - Franklin High School dated October 10, 1991, PHS/BHD <br /> requested additional work at the site <br />' Helmick and Lerner Inc subsequently submitted a workplan titled Work Plan for Installation of <br /> Monitoring Well, Franklin High School - Stockton Unified School District dated February 6, <br /> 1998 The workplan purposed methods and procedures to evaluate whether or not petroleum <br /> ihydrocarbons have migrated through soil and into groundwater with the installation of a single <br /> monitoring well This workplan was approved by PHSIEHD, in correspondence dated March 25, <br />' 1998 <br /> 2.4 METHODS AND PROCEDURES <br /> To evaluate whether or not MTBE has migrated through soil and into groundwater, two soil <br /> borings were advanced in the vicinity of the former UST All field activities were performed in <br /> accordance with ATCs Work Plan for Additional Subsurface Investigation - Stockton Unified <br /> School District and ATC's Site Safety Plan and Quality Assurance/Quality Control Plan <br /> (QA/QC Plan) submitted to PHS/EHD on October 4, 2001 <br /> 2_1 Soil Boring Advancement and Sampling <br /> Drilling was conducted on February 7 and 8, 2002 by Gregg Drilling and Testing, Inc (State C57 <br /> license no 485165) utilizing a geoprobe drill rig The borings were advanced to a depth of 120 <br /> feet bgs employing cone penetrating testing (CPT) methods A cone mounted with sensors at the <br /> tip was advanced into the soil using direct push rods The sensors tested the response of the soil <br /> to the force of the penetrating cone and this allowed the subsurface stratigraphy to be <br /> characterized <br />' The soil samples from soil boring CPT-1 and CPT-2 advanced to 120 feet bgs, were collected at <br /> 50 feet bgs which was interpreted to be in the capillary fringe just above the water table and at 91 <br /> feet bgs which was interpreted to be at the top of the first confined aquifer A one-inch diameter <br /> sampler containing two stainless steel tubes was utilized to collect the soil samples A field <br />' geologist was present for the collection of the soil samples <br /> 22.22 Soil Sample Analysis <br /> Selected soil samples were placed on ice, and transported under chain-of-custody to Argon <br /> Laboratories (FLAP #2359) of Ceres, California for analysis All soil samples were analyzed for <br /> TPHg and BTEX utilizing EPA Method 8015 and 8020, and oxygenate fuel additives utilizing <br /> EPA Method 8260 The analytical results for soil samples are summarized in Table 1 <br /> Laboratory data sheets and chain-of-custody documentation are included in Appendix B <br /> w lwordp,.A 7292/17292 011reporlslsup_mv doc 2 <br />