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Harlan Knoll San Joaquin County Public Health Services GEOTECHNICAL Environmental Health Division 304 East Weber Street, Third Floor Stockton, California 95202 Telephone: (209) 468-3433 Facsimile: (209) 464-0138 EfMROr4VWA AL DESIGN/BUILD CONSTRUCTION MANAGEMENT 631 Commerce Drive Suite 100 Roseville, CA 95678-6431 916. 786.6683 FAX 916. 786.7B91 www.acgconsulting.com EMPLOYEE-OWNEO SUBJECT: SITE ASSESSMENT WORK PLAN FORMER ETHANOL TANK 757 East I1`" Street, Tracy, California Dear Mr. Knoll: MAY 26 2000 ENVPOMILTH T//SERV CES ENVIRONMENTAL HEALTH DIVISION 304 E. Weber Ave. Third Floor P. O. Box 388, Stockton CA 95201-0388 Approved Denied r1l n....riitinnckfLL4j_ PRI) D.0 On behalf of AMI Group, lnc. and The Cranbrook Group, Anderson Consulting Group (ACG) prepared this work plan for assessment of the former ethanol tank location at the former Heinz Plant, 757 East II" Street, Tracy, California (Figure 1). This work plan responds to a request by San Joaquin County -Public Health Services -Environmental Health Division (San Joaquin County) for additional soil and ground water characterization warranted by results obtained during removal of the ethanol underground storage tank (UST) in March 2000. In addition, ACG prepared the attached health and safety plan for the proposed work. Background Between 28 and 30 March 2000, Semco removed a 40,000 -gallon UST that had once contained ethanol used for the production of vinegar in the adjacent building. Semco also removed approximately 160 feet of product piping leading both from the tank to the vinegar production building and from the tank to a rail spur. Semco excavated an area 80 feet long by 35 feet wide to a depth of least 8 feet to remove the UST and trenched 3 feet deep to remove the product piping. Semco encountered ground water in the excavation at approximately 8 feet below ground surface (bgs). Following removal of the tank, the representative of San Joaquin County observing the tank removal requested Semco to collect a soil sample under the concrete slab beneath the tank. A grab -ground water sample was collected instead after it was apparent that the excavation could not be dewatered sufficiently to collect the soil sample. Semco collected the following samples during removal of the tank and product line (Refer to Figure 2 for sample locations): • One grab -ground water sample from a test -pit north of the tank at a depth of 8 ft.et bgs prior to tank removal; • Four confirmation soil samples, one from each of the tank excavation sidewalls, at a depth of 8 feet bgs; • One grab -ground water sample from the bottom of the excavation at the depth of 16 feet bgs after a failed attempt to collect a bottom soil sample;. s:\envifo mentahcurrent jobskl399 heir plant tank investigation\4399 work plal; cher