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�f <br /> IIS �I <br /> Mr Micheal Infurna <br /> 2 <br /> vicinity of the former UST (Philip Environmental, Preliminary Subsurface Investigation Report, June <br /> 2, 1998) Figure 2 depicts the former tank location and soil boring locations Analytical results of soil <br /> and groundwater samples from the bonngs are summarized in Tables 1 and 2 respectively <br /> Based upon the information from the subsurface investigation, San Joaquin County PHS/EHD required <br /> the installation of monitoring wells A workplan dated December 11, 1998 and workplan addendum <br /> dated January 15, 1999 were subrrutted to San Joaquin County PHS/EHD and approved for <br /> implementation <br /> PROCEDURES <br /> Permitting <br /> Prior to initiating fieldwork, well installation and encroachment permits were obtained from San <br /> Joaquin County PHS/EHD and the City of Stockton, respectively All fieldwork was performed in <br /> accordance with the Ground Zero's Site Safety Plan and Quality Assurance/Quality Control Plan <br /> included with the workplan addendum <br /> Drilling and Soil Sampling <br /> On July 13, 14 and 16, 1999, Ground Zero supervised Spectrum Exploration(C57 512268) during the <br /> advancement of three soil borings MWl, MW2, and MW3 (Figure 2) Soil samples were collected at <br /> 5-foot intervals using an 18-inch long core sampler lined with new 2-inch diameter brass and/or <br /> stainless steel sleeves, affording soil identification and subjective evaluation for contamination A <br /> flame ionization detector (FID) was used to monitor the presence of volatile organic compounds <br /> in the soil The soil samples collected were sealed, labeled, and immediately placed in an iced <br /> cooler and transported to Argon Labs (FLAP 2359) under chain of custody protocol Soil <br /> samples selected for analysis were based on field observations and screening results Analysis <br /> consisted of total petroleum hydrocarbons as gasoline (TPHg) using modified EPA method 8015, and <br /> benzene, toluene, ethylbenzene, xylenes(BTEX)using modified EPA method 8020 <br /> Soil and nnsate generated during drilling activities was placed into DOT approved 55-gallon drums, <br /> which are currently stored onsite pending proper disposal All drilling and sampling equipment was <br /> decontaminated prior to use and between sample collection events to minimize the possibility of cross <br /> contamination <br /> Well Construction <br /> Based on the lithology and initial depth to groundwater observed in the borings, wells MW 1 and MW3 <br /> were screened from 15 to 35 feet bgs and MW2 was screened from 15 to 40 feet bgs (approval for an <br /> g-senaVubsurf rpt <br />