SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

f Environmental Science & ® Engineering,Inc. R CILWPV ComrynY RECEIVE July 11, 1990 J U L 1 6 1990 Project No. 02-531-002 ENVIRONMENTAL HEALTH PERMIT/SERVICES Ms. Mary Raygoza Environmental Coordinator Delta Truck Sales P.O. Box 8068 Stockton, CA 94208 SUBJECT: Addendum to"Report of Stockpiled Soil and Excavation Activities of Former Surface Impoundment at Delta Truck Sales, 3535 Cherokee Road, Stockton, San Joaquin County, California" Dear Mary: This letter is to transmit additional sample analysis results as an addendum to the subject report. Table 5 - Soluble Metals Analyses of Excavation Floor Soil Samples and Blue Sample - presents results of soluble lead analyses on soil samples F1 through F4, obtained from the floor of the excavation (see Figure 3 in the subject report), and the results of analyses for soluble concentrations of the CAM 17 metals in the solid sample of blue material that looked like dried paint (Blue-1). The levels of soluble lead in the excavation floor samples ranged from 0.010 to 0.016 mg/L, well below the Soluble Threshold Limit Concentration (STLC) level of 5.0 mg/L established by California. Soluble lead was detected at a concentration of 11 mg/L in the Blue-1 sample. Soluble concentrations of the other metals were below STLC levels except for cadmium, which was detected at 1.0 mg/L, the same as its STLC level. Thallium was detected at 5.6 mg/L, relatively close to the STLC value of 7.0 mg/L These results imply that the floor of the excavation does not contain high levels of soluble lead and it may represent the vertical extent of lead in the subsurface below the former surface impoundment. The results also indicate that the blue material, which is found scattered throughout the site, may be one of the sources of soluble lead and possibly other metals. 597 Center Avenue,Suite 350 Martinez,CA 94553 Phone(415)372-3637 Fax(415)372-3790