SITE INFORMATION AND CORRESPONDENCE 1991-1992

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Pacific Gas and Electric Company Environmental Services P.O.Box 7640 San Francisco,CA 94120 415/972-7000 Direct Dial 415/972- September 27, 1991 Telecopy415/972-9201 ' t Mr. James Giottonini Director of Public Works City of Stockton 425 North E1 Dorado Street Stockton, California 95202 Attention: Robert Brothers As we discussed last week by telephone, Pacific Gas & Electric Company (PG&E) is requesting your cooperation in an environmental project we are conducting at our facility 425 South Center Street in Stockton. I am writing this letter to describe our requests and provide some background on this project. PG&E, or our predecessor utilities, operated approximately 100 manufactured gas plants (MGPs) throughout California during the period 1850 to 1930. These facilities processed coal or oil to produce gas for heating and lighting and generated residues known as "lampblack" and "coal tar". Although the manufactured gas plants are all long closed, some of these residues can still be found on the former MGP properties. Recognizing this potential , PG&E has undertaken the study, and if necessary remediation, of the MGP properties. We are working with the California Environmental Protection Agency (Cal EPA) on this project. Our property at 425 South Center Street is a former manufactured gas plant. We are requesting your cooperation with two activities which Cal EPA has requested that PG&E perform. These activities are described below. 1) Hazelton Avenue Strip is the dirt slope (approximately 20 feet wide) between PG&E's property line and Hazelton Avenue (Area A on the map) . Cal EPA is concerned that the public could come in contact with MGP residues which may be present on,that slope. PG&E's plan is to chemically test the soil for these residues and if they are present in significant amounts to prevent public exposure to the residues by fencing or paving or another acceptable method. The testing will involve collecting six samples by hand just below the ground surface. We are asking your permission to perform that testing, and will meet with you regarding the results and possible next steps. 2) Background soil samples samples are required by Cal EPA in an area similar to the MGP property which could not have been affected by operations there. These results will be used to estimate the range of normal_ (background) concentrations of the chemicals of interest. PG&E has proposed locations for these samples (Areas B on map) , but these locations can be adjusted if the City desires. The sampling will involve drilling with a truck mounted rig to a depth of about 20 feet and will require about four hours at each location.