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File No. 20-3978-01.W 16 KLEINFELDER January 8, 1997 ATTACHMENT A SCOPE OF WORK SOIL SAMPLING AND ANALYSIS FORMER COPPER BLAST (SAND BLASTING) AREA FORMER SPRECKELS SUGAR PLANT 18800 SOUTH SPRECKELS ROAD MANTECA, CALIFORNIA File No. 20-3978-O1.W16 January 8, 1997 INTRODUCTION On July 7, 1988, a fire of undetermined origin destroyed the chemical warehouse at the former Spreckels Sugar Plant in Manteca, California (Plate 1). The building consisted of a pole barn on a concrete foundation and was used to store bulk chemicals for use in the plant. During the post fire clean up and site assessment, soil samples were collected for chemical analysis. The results of the post fire clean up and site assessment were presented in a report prepared by John Minney of Absolute Testing (Final Site Closure, Job 88022, dated April 18, 1989, by John M. Minney, Consulting Engineer, Absolute Testing, Fresno, California). Concentrations of copper exceeding the Total Threshold Limit Concentration (TTLC) were present in several of the soil samples collected. The TTLC is used along with the Soluble Threshold Limit Concentration (STLC) to identify hazardous waste for management and disposal purposes in California. The TTLC and STLC are defined in Section 66261.24 of Title 22 of the California Code of Regulations. Concentrations of arsenic, chromium, lead, molybdenum and zinc were also elevated with respect to background soil concentrations. According to the April 1989 site closure report, discussions with factory personnel established that the source of the elevated metals concentrations was the presence of"copper blast' in the soil. Sand sized copper beads were used in place of silica sand in sand blasting operations at the site. The copper blast did not produce the silica dust associated with traditional sand blasting operations. Sand blasting of equipment was conducted on part of the storage warehouse slab. The copper blast in the soil was a result of the previous sand blasting activities, and firefighting efforts during the chemical warehouse fire. Ie soil mixed with copper blast was mapped out by John Minney/Absolute Testing. proximately 406 tons of copper blast and soil mixture was excavated and shipped via railcar the manufacturer for recycling. The California Department of Health Services, Toxic bstances Control (now under Cal-EPA), granted a hazardous waste manifest variance owing the copper blast to be returned to the manufacturer. 20-3978-01.W167207PE014 Page I of Copyright 1997, Kleinfelder, Inc.