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U�J PUBLICEALTH SERNCES �a" �A SAN JOAQUIN COUNTY F. ENVIRONMENTAL HEALTH DIVISION . Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer 445 N. San Joaquin Street 0 P.O. Box 388 0 Stockton, CA 95201-0388 crxoR (209) 468-3420 C,(a RIC NOTINI DIRECTOR OF ENVIRONMENTAL SERVICES CATELLUS DEVELOPMENT CORPORATION 201 MISSION STREET 30TH FLOOR SAN FRANCISCO CA 94105 JUN 2 0 1994 RE: Catellus Development Property SrM CODE: 1294 A 1325 West Weber Stockton CA 95203 San Joaquin County,Public Health Services,Environmental Health I 0ision�(PHS/EHD)has completed review of the"Response to Comments on Soil Remediation Activities andbosure Report" dated May 16, 1994 and the "Proposal for Additional Sail Characterization" dated May 24, 1994 both prepared by ERM-West. PHS/EHD has the following comments for your consideration. % Response to Comments on Soil Remediation Activities and Closure Report Commenti 2b) The soil contamination evidenced in sample 1BN11W16 anInd now!r located on a revised Figure 4 will require additional characterization to determine the vertical and 'horizontal extent of the contamination. The proposed soil boring in the tank#1 area may be relocated to characterize this area. 2c) While it is true that soils containing significant amounts of i organi c material have a unique odor,the odors which were observed elsewhere during the excavation were generally substantiated by the laboratory results. However,as you are aware the laboratory analytical methods which were employed are suspected to have under reported the results. PHS/EHD requests additional investigation in the area of soil sample, 1BS2W19, to confirm that the soil contamination observed was successfully excavated. The proposed soil boring in the tank#1 area may be ielocated to characterize this area. 3a) Sample E2N6 was collected at 9 feet on October 6, 1993 and PHS/EHD disagrees that this area was over excavated further. This sample was collected at the southwestern edge of the excavation. Subsequently, the excavation was extended further to the west an north. The next closest sample, collected on October 7, 1993 in this area,was EIN3(PHS/EHD designated W1N3)collected at 8 feet with contamination observed and evidenced with laborato.I ry results. The next closest sample, was collected on October 8, 1994 in this area, was WSN18 collected ilat 9.5 feet with no contamination noted nor evidenced with laboratory results. It was stated[that further deepening of the excavation was not planned because of building stability. Based on PHS/EHD field observations it is unlikely that the area sample E2N6 was collected from,was further lexcavated. PHS/EHD requests additional investigation in the area of soil sample, E2N6, to confirmthat the soil contamination observed was successfully excavated. One of the proposed soil borings in the tank #2 area may be relocated to characterize this contamination. PHS HD 3c) Sample BW9NI8 was collected at 10 feet on October 7, 1993 and!I /E disagrees that this area 11 W5NI8 collected on October 8, 1994 at was over excavated further. While the next closest sample,, 95 feet did not evidence soil contamination, PHS/EHD is not 'convinced that the contamination evidenced was completely excavated. PHS/E1-1D requests additional investigation in the area of BW9N18, to confirm that the soil contamination has been successfully excavated. One of the proposed soil borings in the tank #2 area may be relocat8!d to cliaracterize this contamination. A Division of San Joaquin County Health-Care Services