SITE INFORMATION AND CORRESPONDENCE

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PUBLIC`"HEALTH SERVICES SAN JOAQUIN COUNTY r' ENVIRONMENTAL HEALTH DIVISION Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer 445 N. San Joaquin Street • P.O. Box 388 • Stockton, CA 95201-0388 (209) 468-3420 JUAN QUIJANO BOB BENNET TRI VALLEY GROWERS C (DFY P 0 BOX 1211 MODESTO CA 95353 MAR 14 199r, RE: 11 SOUTH A STREET SITE CODE: 2040 STOCKTON CA San Joaquin County Public Health Services, Environmental Health Division (PHSIEHD) has completed the review of the "Sampling Report - Soil Remediation Proposal" dated January 26, 1995, and has the following comments for your consideration. The laboratory results for the soil sampling from the last phase of field work contained no quality control/quality assurance data. Without this information, the accuracy and/or precision of the results cannot be evaluated. Quality control/quality assurance data must be submitted with the laboratory results. In addition, the date on the laboratory results is 15 days from the date of sample collection. Soil samples must be analyzed within 14 days from the date of collection. The evaluation of the remedial alternatives at this site failed to adequately provide for the costs of implementing the alternatives. The costs to be reported in the remedial plan must be broken down into unit costs for the work specific for this site. PHSIEHD has identified the following potential problems with the proposed bucket auger method of excavation: Any attempt to remove the pea gravel fill from a 30 inch by 72 inch area may result in the intrusion of the remainder of pea gravel in the former tank pit into the excavation. The proposal does not indicate how confirmation soil samples would be obtained. It appears from the description of bucket augering that it would be difficult to obtain undisturbed soil samples. Any remaining soil contamination proposed to be left behind must be A Division or San.ioaquin County Health Care Services