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' Work Plan Addendum - November 1997 <br /> { • Former CHASE CHEVROLET - MADISON Facility <br /> ' 423 North Madison Street, Stockton, California <br /> ' 1.0. INTRODUCTION AND SCOPE OF WORK <br /> In accordance with the request of Mr Jeffery Setness of Hartmann & Setness, Advanced <br /> tGeoEnvironmental, Inc (AGE) has prepared this Work Plan Addendum for additional assessment <br /> of Impacted soil and ground water near the fenner location of underground storage tank (UST)No <br /> 8 at 423 North Madison Street, Stockton, California <br /> The proposed scope of work Includes advancement of three soil probe bonngs and collection of soil <br /> ' and grab water samples The site location Is Illustrated on Figure 1 - Location Map Structures, <br /> existing and proposed soil probe boring locations and monitoring well locations on the site are <br /> Illustrated on Figure 2 - Site Plan Background Information was summarized In the Revised <br /> ' Col i ective Action Plan - Feb?uai y 1997 and previous Quarterly Reports prepared by AGE <br /> This work plan addendum was prepared In accordance with San Joaquin County Public Health <br /> Services - Environmental Health Division(PHS-EHD) and Central Valley Regional Water Quality <br /> Control Board (CVRWQCB) guidelines for the Investigation of UST sites <br /> lie 2 0 SCOPE OF WORK <br /> ' 2 1 DRILLING AND SAMPLING <br /> In a letter dated 12 November 1997,the PHS-EHD recommended additional assessment of impacted <br /> ' soil below ground water in the area of UST No 8 Therefore, to assess the vertical,extent of <br /> hydrocarbon-Impacted soil, AGE proposes to advance three soil probe borings (probing) to depths <br /> of approximately 40 feet belo-�N surface grade (bsg) Probings may be advanced to greater depths or <br /> ' additional probings may be advanced based upon field observations, time permitting The probings <br /> will be advanced using AGE s Geoprobe soli probing unit <br /> One soil probe bol Ing will be advanced near the center of the former UST No 8 excavation, a <br /> second probe boring will be advanced northeast of the former excavation, a third probe boring will <br /> be advanced within the former repair shop, north of the former UST excavation Proposed probing <br /> locations are Illustrated on Figure 2 <br /> 2 2 EQUIPMENT DECONTAMINATION <br /> ' All Geoprobe sampling tools and sample liners used for sample collection will be thoroughly and <br /> • doubly rinsed with clean tap water after washing with a solution of Alconox Geoprobe rods that <br /> corne Into contact with sampled soil, will be cleaned between borings <br /> lie <br /> Advanced GeoEm ironmental,Inc <br />