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' 540 West Scotts Ave0e • August 4, 1997 <br /> Project 9644 Page 2 <br /> Acme Galvanizing Company Inc. operated a zinc plating (galvanizing) <br /> facility at the site from 1968 until 1982 A sulfuric acid spill occurred <br /> during 1981 after a pipe hit an acid tank. Plant operations ceased during <br /> 1982 when a galvanizing kettle failed. The plant was subsequently closed <br /> ' and dismantled. <br /> McKesson Environmental Services in reports dated February 1, 1984 and <br /> December 4, 1985 documented soil impacted with zinc and acid from <br /> solution spills. Hydrotech Consultants, Inc. performed additional <br /> investigation to delineate the zinc and lead impacted soil at the site. <br /> Groundwater was not impacted at the site. <br /> ' Clayton Environmental Consultants performed remedial investigations as <br /> requested in a letter dated March 29, 1989, from the Department of Health <br /> Services, Toxic Substances Control Program. Clayton Environmental <br /> Consultants prepared a feasibility study dated February 26, 1990. The <br /> ' feasibility study concluded that on-site chemical stabilization and disposal <br /> of the impacted soil was the most efficient method of remediation. The <br /> Department of Health Services, Toxics Substances Control Program <br /> approved the proposed removal/treatment action and set soil cleanup <br /> levels at 174 parts per million (ppm) for lead and 5,000 ppm (TTLC) for <br /> ' zinc (Correspondence, Department of Health Services, Toxic Substances <br /> Control Program,July 2, 1990). <br /> During June 1990, Clayton Environmental Consultants excavated <br /> impacted soil from areas identified during the soil delineation. Impacted <br /> soil was removed until confirmation soil samples collected from the <br /> texcavations indicated concentrations of lead, zinc, and low pH which <br /> were within clean up levels set by the Department Health Services, Toxic <br /> ' Substances Control Program. The zinc and lead impacted soils were <br /> treated at the site by mixing Chloranan, cement, and the impacted soil to <br /> form a concrete slurry. The slurry was placed into a prepared excavation <br /> sprayed with a Borax solution to increase the soil pH. Excavated soil with <br /> low pH was spread, sprayed with the Borax solution and mixed at the site. <br /> Treated low pH soil was placed over the concrete slurry mixture as <br /> packing material and covered with a 2-inch thick asphalt cap barrier. <br /> On February 20, 1996. Chemical Data Management Systems collected <br /> groundwater samples from monitoring wells MW-1 MW-2 and MW-3. The <br /> groundwater samples were analyzed for concentrations of lead and zinc using <br /> Environmental protection Agency (EPA) Method 200.7. Analytical results of <br /> groundwater samples collected from monitoring well MW-1 reported zinc and <br /> lead concentrations of 0.09 ppm and below the method detection limit of 0.05 <br /> parts per million (ppm), respectively. Analytical results of the groundwater <br /> WILLIAM DUBOVSKY ENVIRONMENTAL <br /> Environmental Consulting ♦ Project Management <br />