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c e <br /> 1 <br /> WORK PLAN. <br /> FOR <br /> SUPPLEMENTAUS.ITE INVESTIGATION <br /> BP Oil Company Service Station No. 11193 <br /> 3202 West Hammer Lane <br /> t Stockton, California <br /> 1 Proj ect,No. 10-136 <br /> L INTRODUCTION: <br /> " This work plan presents the proposed scope of work:to perform a supplemental site <br /> investigation at BP Oil Company Service Station Noc 11193, 3202 West Hammer,Lane, <br /> Stockton, California._ 'A site plan is shown iii'Figure'1. <br /> PROJECT BACKGROUND <br /> On December 3, 4, and:10, 1992, four soil borings were drilled at the'site for.construction of <br /> groundwater Monitoring Wells MW-1 to MW-4. 'Laboratory analysis of soil samples collected <br /> at depths of between approximately 11 and 20 feet below grade in the immediate vicinity of <br /> the,underground storage tanks and dispenser islands detected benzene, toluene, <br /> \C� ethylbenzene, and total xylenes in only two samples.: Analysis of groundwater samples` <br /> detected u to 2,200 arts per billion (ppb),total petroleum hydrocarbons as <br /> -is lin TPH G <br /> n� P P P SPP ) P Y g )- <br /> and 120 ppb benzene.in-MW-1 and MW 2 A preliminary site assessment report was <br /> - `\ submitted to the governing regulatory agencies in February 1993..' <br /> SCOPE OF.WORK <br /> The proposed scope of work involves installation of one onsite and two <br /> n <br /> offsite groundwater <br /> _' monitoring wells to further assess.the nature and extent of petroleum hydrocarbons in the - . <br /> ' soil and groundwater. Workwill be conducted iniA&ordance with applicable regulations <br /> and guidelines,of the San Joaquin County•Public Health Services Department and the <br /> California Regional Water Quality Control Board, San Francisco Bay Region The scope of <br /> work has been divided into the following tasks: <br /> D "V <br /> Task 1. Acquire Permits <br /> b ' Before beginning the field work, the necessary drilling and groundwater well <br /> installation permits will be obtained,`underground utilities will be located;and-field <br /> activities will be scheduled: <br /> - 1013601/042793 - 1 <br /> ALISTO ENGINEERING'GROUP <br />