Laserfiche WebLink
@TWANEENVIRMtiW <br /> 1.0 INTRODUCTION Ot- <br /> De Rollo Mazda retained North Cal Construction to remove a 5000 gallon leaded <br /> gasoline tank pursuant to San Joaquin County Local Health District (SJHD) underground <br /> tank closure regulations. After removing the 5000 gallon tank, indications of native soil <br /> contamination were found. North Cal Construction, on behalf of De Rollo Mazda, <br /> authorized Thorne Environmental, Inc. to prepare this work plan for site assessment and <br /> characterization. The work plan will encompass De Rollo Mazda's former facility at <br /> Grant and Miner, Stockton, California (Figure 1). SJHD is the lead regulatory agency <br /> for this project. <br /> ` 1.1 PURPOSE <br /> The site assessment and characterization described in this work plan has the following <br /> ` objectives: <br /> 0 Determine the vertical and lateral extent of the soil contamination involving <br /> ` volatile aromatic organics (BTX&E) and total petroleum hydrocarbons <br /> (TPH)• —��I <br /> 0 Determine the source of the contamination. <br /> 1.2 SCOPE OF WORK <br /> L <br /> The scope of services described in this work plan encompass the entire site and include: <br /> L j, <br /> 06 O � c,po —Location of underground utilities utilizing De Rollo Mazda and North Cal <br /> �u' Construction information as well as the underground services alert (USA); <br /> L 0 Advancement of up to 4 soil borings for the former 5000 gallon leaded <br /> gasoline tank located in the east side of the facility. Advancement of up <br /> / ? to 4 soil borings for 1000 gallon gasoline tank removed two years ago. The <br /> L J V) 1000 gallon gasoline tank was located on the west side of the facility. The <br /> approximate locations of the 8 soil borings are shown on Figure 2; <br /> L 0 The borings will be advanced to approximately 35 feet or 5 feet below level <br /> where last contaminants are detected. Groundwater levels will not be <br /> reached during boring advancement. The augers will be steam cleaned <br /> prior to and between each boring to prevent cross-contamination; <br /> 0 The samples will be collected at approximate 5 foot intervals to a depth of <br /> 35 feet or 5 feet below level where last contaminants are detected. The <br /> samples will be collected using a standard California split spoon sampler <br /> with brass tubes steam cleaned prior to use. These samples will be field <br /> screened and selected samples will be chosen for chemical analysis; <br /> 1 <br />