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,4� • Remedial Action Work Plan NEWFIELD PROPERTY 107 North School Street, Lodi, California 1.0. INTRODUCTION At the request of Mr Anthony Barkett of Emerald Properties,Advanced GeoEnvironmental, Inc (AGE) has prepared this Remedial Action Work Plan (RAWP) detailing design of a remediation system for the "core" petroleum hydrocarbon-impacted area at 107 North School Street, Lodi, California(the site) The site setting is illustrated on Figure 1 Site structures and well locations are depicted on Figure 2 The RAWP is prepared in accordance with San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control Board (CVRWQCB) guidelines for corrective action at leaking underground storage tank (UST) saes 2.0. BACKGROUND The site is located in a commercial area of central Lodi, San Joaquin County, California, at the • northwest corner of the intersection of North School Street and West Elm Street The site is located in an area of low topographic relief at an elevation of approximately 48 feet above mean sea level (Lodi North Quadrangle, 7 5-Minute USGS Topographic Series, 1968, photo revised 1976) One structure is located on the property The property was formerly occupied by a gasoline service station, the gasoline service station operated from approximately 1922 until approximately 1979 Additional background information is summarized in the Preliminary Site Assessment Report, dated 16 February 1999, the Quarterly Report -May 1999, the Quarterly Report -August 1999 and the Corrective Action Plan - June 1999, all prepared by AGE The following is a summary of preliminary site assessment field activities conducted at the site • Four USTs and one 55-gallon drum were removed from the site on 21 September 1987 The USTs ranged in volume from 250 to 2,000 gallons and were used to store gasoline and waste oil Petroleum hydrocarbons were detected in soil samples collected beneath the USTs at concentrations as high as 1,300 ppm • On 25 February 1989, impacted soil was excavated from the former UST area The excavation reportedly encompassed an area of approximately 40 feet by 40 feet and extended to a depth of approximately 22 feet below surface grade(bsg) The excavation was backfilled to grade with sandy loam . On 13 October 1989, soil was excavated at the southeast corner of the property to confirm the removal of impacted soil during the February 1989 excavation The second excavation Advanced GeoEnviron mental,Inc