SITE INFORMATION AND CORRESPONDENCE FILE 1

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Remedial Investigation/Feasibility Study Work Plan NOMELLINI CONSTRUCTION CO. 1045 West Charter Way, Stockton, California 1 .0. INTRODUCTION Advanced GeoEnvironmental, Inc. (AGE) has prepared this Remedial Investigation/Feasibility Study Work Plan for the performance a six-month oxygen release compound (ORC) pilot test, and collection of soil samples for bioremediation analysis at 1045 West Charter Way (the site), Stockton, California. The location of the site is illustrated in Figure 1 . A plan of the site is illustrated on Figure 2. This work plan is prepared in accordance with San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control Board (RWQCB) guidelines for the investigation of underground storage tanks (UST) sites. The purpose of this work plan is to evaluate feasibility and cost effectiveness of remediation alternatives towards the recent increased interval of hydrocarbon-impacted saturated soil at the site. 2.0. BACKGROUND The site is located approximately one-half mile west of Interstate 5 on West Charter Way in a topographically flat area of Stockton, California (Figure 1 ). The site is located northwest of Section 10, Township 1 North, Range 6 East, Mount Diablo Base and Meridian (Stockton West Quadrangle, 7 . 5 -Minute USGS Topographic Series, 1968 , photo revised 1987). 2. 1 . SITE DESCRIPTION The site is currently occupied by Russ Enterprises for safety equipment distribution. The facility consists of a warehouse building and safety equipment storage yard. 2.2. UNDERGROUND STORAGE TANK REMOVAL In August 1988, two 1 ,000-gallon USTs were removed from the site. The tanks were used for the storage of regular and unleaded gasoline. Analytical results of soil samples collected from beneath the gasoline USTs indicated that an unauthorized release of hydrocarbons had occurred. The tank area was re-excavated in November 1988 . Soil was removed from the former UST area to a depth of 19 feet. Soil samples were collected from the excavation and screened for organic vapor using a photo-ionization detector (PID). Organic vapor readings indicated that petroleum Advanced GeoEnvironmcntal, Inc.