Laserfiche WebLink
� v <br /> a <br /> . AS S D C I A T E S I N C <br /> 4.0 WELL INSTALLATION ACTIVITIES <br />' All work was completed in general accordance with ATC's Interim Remediation Plan for the <br /> Farmer Property, 610 North Hunter Street, Stockton, California, dated October 24, 2001 San <br /> Joaquin County Environmental Health Division approved this workplan with minor modification <br />' on November 2, 2001 <br />' 4.1 Hollow Stem Auger Drilling Activities <br /> On December 26 through 28, 2001, an ATC geologist supervised the advancement of two soil <br />' borings to depths of approximately 42 feet bgs and two soil borings to depths of approximately <br /> 26 feet bgs A site plan with soil boring locations is shown on Figure 2 Woodward Drilling, <br /> California License C57 710079, advanced the borings utilizing a hollow stem auger drill rig <br />' Soil samples were collected from the borings at five-foot intervals in stainless steel sampling <br /> tubes <br />' The cored samples and drill cuttings were characterized for soil type, moisture content, and <br /> visual evidence of petroleum hydrocarbons An FID was used as a field-screening device for the <br /> detection of petroleum hydrocarbon vapors in drill cuttings and cored samples A field geologist <br /> logged drill cuttings and soil samples utilizing the Unified Soil Classification System <br /> Descriptions of soil types encountered and sample collection intervals are included on the well <br /> construction logs contained in Appendix A The soil borings were then completed as two vapor <br /> extraction wells and two air sparge wells Drill cuttings were temporarily stored on site in 55- <br /> gallon DOT approved steel drums <br /> 4.2 Soil Analysis <br /> 1 Selected soil samples were kept on ice and delivered under chain-of-custody documentation to <br /> State-certified Argon Laboratories in Ceres, California for chemical analysis Selected soil <br /> samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg) by EPA method <br />' 8015, benzene, toluene, ethyl benzene, and xylenes (BTEX) by EPA method 8020, and methyl <br /> tertiary butyl ether (MTBE), tertiary butyl alcohol (TBA), di-isopropyl ether (DIPE), ethyl <br /> tertiary butyl ether (ETBE), tertiary amyl methyl ether (TAME), 1,2-dichloroethane (1,2-DCA), <br />' and 1,2 dibromoethane (EDB) by EPA method 8260 The analytical results for soil samples are <br /> summarized in Table 1 Laboratory data sheets and chain-of-custody documentation are included <br /> in Appendix B <br />' 4.3 Well Construction Details <br />' Soil borings V W3 and VW4 were completed as vapor extraction wells and soil borings AS 1 and <br /> AS2 were completed as air sparge wells to be part of the remediation system at the site <br /> w Iwordpro1625961reportshrp doe 3 <br />