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�RZAW <br /> Working To Restore Nature <br /> . March 18, 1993 <br /> ARCO Station No 6100, Tracy, California <br /> ADDENDUM TO WORK PLAN <br /> Based on the results of this and previous investigations, and at ARCO's request, RESNA <br /> will perform the following work <br /> o Contact the owner of property south of the site to obtain access for drilling southeast <br /> of boring B-26 <br /> o Obtain permits from San Joaquin County Public Health District to drill borings on <br /> property south of the site <br /> o Contract with a licensed drilling company to drill three borings offsite (Plate 13), <br /> after access to offsite property and permits are obtained One boring will be drilled <br /> southeast of boring B-26 to evaluate the extent of gasoline hydrocarbons south of the <br /> site and the other two borings will be used to evaluate the lateral distribution of <br /> hydrocarbons southwest and east of boring B-26 However, if evidence of residual <br /> gasoline hydrocarbons are detected <br /> he southes�bor�e, we i collect soil samples from <br /> about <br /> drilling another boring further <br /> the bonngs for laboratory analyses <br /> o Construct 4-inch-diameter vapor-extraction wells in the three borings, if necessary, <br /> and if authorized by the property owner. <br /> o Submit soil samples from the borings Protection Agency (EPA) Methods 8015 <br /> f State-certified laboratory for analyses <br /> of TPHg and BTEX using Environmental <br /> and 8020, respectively <br /> o Prepare a Preliminary Investigation and Evaluation Report after the lateral extent <br /> of residual gasoline hydrocarbons <br /> soil <br /> w 1 prepare a status report describing <br /> neated. If residual <br /> hydrocarbons have not been delineated, we <br /> our findings and recommendations <br /> The work will be performed according to the methods and procedures described in <br /> RESNA's Work Plan No 30041-2W, datedat ons�for In tion and Evaluation on and In ested using e Central anof <br /> Valley Re tonal Board Staff Recommend Appendix A of the Tri-Regional <br /> nder round Tanks (Tri-Regional Recommendations), App as references <br /> Recommendations, and the Lenkdlconstndiction ofv apor-extraction wells arManual e d scribed in the <br /> The methods for installation <br /> attached Field Procedures Remediation of v°ili submit a remwill tbe eed�at�on plan to San Joaqued during this phase in <br /> work Before remediation is begun, ARCO <br /> County Public Health Services for their review and for 30 day public review <br /> 1231ccar 4 <br /> 30041.4 <br />