SITE INFORMATION AND CORRESPONDENCE

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PUBLIC-HEALTH ERVICES SAN JOAQUIN COUN Y '; ?, ENVIRONMENTAL HEALTH DIVISION Ernest M. Fujimoto, M.D., M.P.H., Acting Health OfficerR 445 N. San Joaquin Street • P.O. Box 388 • Stockton, CA 95201-0388 �ifioRe� (209) 468-3420 JOHN DIECKMAN EXECUTOR (D PY MCCALLISTER TRUST 500 AIRPORT BLVD STE 200 MAR 2 4 1994 BURLINGAME CA 94010 RE: System 99 SITE CODE: 1275 601 South Ventura Stockton, CA 95203 San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has completed review of the "Soil Excavation Report" March 4, 1994 and F repared by RESNA. PHS/EHD has the following comments for your consideration. Soil The excavation commenced on November 8, 1993 and removed approximately 1,500 cubic yards of contaminated soil. The soil excavation appeared to have a ectively removed the contaminated soil as evidenced in the results of the November 12, 1993 confirmation sampling of the excavation which did not detected any contaminants. The soil removed from the excavation was stockpiled on sit and was underlain and overlain by plastic. Soil contamination was detected up to 420,000 ppb T?H-ga 5 and 7,500 ppb xylene during initial sampling which occurred on November 23, 1993. The report include a proposal to treat the contaminated soil by aeration. Please contact the San Joaquin Valley Unified A r Pollution Control District for information regarding obtaining a permit to aerate the soil. Furthermo e, during a recent conversation, March 15, 1994,with John Lane of RESNA, he indicated that the soil may be biologically treated by stimulating the indigenous microbial population by the addition of nutrients. Please submit a final description of the treatment method which will be used.. The proposed confirmation soil sampling plan included in the report will not be adequate to verify the effectiveness of the soil treatment. A total of 30 discrete sc it samples (1 per 50 cubic yards) will be required. The additional samples are requested primarily b=use of the shallow depth to groundwater at the site. Any contaminants which are placed into the excav ition will likely overtime leach into the groundwater. The required frequency of sampling also refl cted a reduction of the number of samples that was originally requested due to the volume of soil excavate(. Since the site is located within the City of Stockton bounda 'es, it will be necessary to secure a grading permit from the City of Stockton Building Division prior tc backfilling the excavation. Groundwater The groundwater sample collected on November 12, 1994 om the water which seeped into the excavation did however, detect contamination of up to 3,100 ppb TPH gas and 7.5 ppb benzene. The report and supporting correspondence to the City of S ockton, dated March 11, 1994, indicated that between 20,000 gallons and 60,000 gallons will be extracted from the excavation and possibly transported to the Municipal Utilities Waste Water Treatment Facility. Please continue to keep PHS/EHD updated on the status of the proposed extraction and disposal. A Division of San Joaquin County H afth Care Service.