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4UORUM <br /> r <br /> ENVIRONMENTAL CONSULTANTS,INC. r 3` <br /> AUG 19 1992 <br /> August 17, 1992 ENVIRONMENTAL HEALTH <br /> POWT/5 0=8 <br /> Mr. Michael Collins <br /> San Joaquin County Public Health Services <br /> P..O Box 2009 <br /> Stockton, California 95201 <br /> Subject: EXECUTIVE SUMMARY OF WORK PLAN FOR PROPOSED <br /> EXCAVATION AND AERATION OF HYDROCARBON-BEARING SOIL AT <br /> A & M MARKET, 4579 EAST ACAMPO ROAD, ACAMPO, CALIFORNIA. <br /> 'Dear Mr. Collins: <br /> j <br /> On June 19, 1992,three 8,000-gallon underground gasoline'storage tanks were removed from <br /> the site. About 125 cubic yards of soil was excavated and stockpiled at the site to allow tank <br /> removal. Gasoline hydrocarbons were detected at concentrations of 600 parts per million <br /> (ppm) and 1,300 ppm in two of six soil samples collected from beneath the tanks following <br /> their removal; hydrocarbons were detected in one of five soil stockpile samples at a <br /> concentration of 33 ppm. <br /> Our excavation program is proposed to remove hydrocarbon-bearing soil from the tank <br /> cavity until either hydrocarbon concentrations in soil remaining in place are acceptable to <br /> the San Joaquin County Public Health Services or until! the safe operating limit of the <br /> equipment has been reached. During excavation we will 3monitor hydrocarbon levels with <br /> a hand-held hydrocarbon detector. We anticipate that the,area below the west ends of two_ <br /> former tanks will be deepened about six feet, and the remainder of the tank cavity will be <br /> deepened about two feet; the decision to terminate excavating will be made in the field. <br /> Soil samples will be collected and chemically analyzed for gasoline constituents by a <br /> California-certified laboratory following excavation. <br /> i <br /> Additionatsoil excavated.from the tank cavity_will be stockniled.at the site near the present <br /> stockpiles and covered with plastic sheeting. About 50 cubic yards of the initial stockpile j <br /> and the additional excavated soil may be aerated on site if hydrocarbons levels are within <br /> San Joaquin County Air Pollution Control District guidelines. After receipt of soil sample <br /> results we will evaluate the need for any additional work;at the site. Following aeration,soil <br /> may be returned to the tank cavity or removed to an appropriate disposal facility. <br /> Sincerely, <br /> Quorum Environmental Consultants, Inc. <br /> i <br /> F <br /> Barry Marcus <br /> Senior Geologist <br /> cc: Mr. Terry Masters, Sacramento Equipment Maintenance Company <br /> 3050 FITE CIRCLE • SUITE 104 • SACRAMENTO, CA 93811 • TEL: 916.363.1900 • FAX: 916.363.4912 <br /> 3 <br />