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R I <br /> PUBLICEALTH SER'�iCES <br /> SAN JOAQUIN COUNTY r. <br /> ENVIRONMENTAL HEALTH DIVISION 7 ` <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer •. <br /> 445 N. San Joaquin Street • P.O. Box 388 • Stockton, CA 95201-0388 <br /> (209) 468-3420 <br /> EDNA ROLLERI & DONNA BRUNO <br /> ESTATE OF ANGELO ROLLERI <br /> 436 W MARIPOSA AVE MAY 2 4 1994 <br /> STOCKTON CA 95204 <br /> RE: Genova Bakery SITE CODE: 1252 <br /> 749 N. Sierra Nevada <br /> Stockton, CA <br /> San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/EHD) has reviewed the "Interim Work Plan: Monitoring <br /> Well Installation" dated April 14, 1994, prepared by Geological <br /> Audit Services, Inc. for the above referenced site. <br /> The work plan proposes drilling three or four soil borings to <br /> maximum depths of 80 feet and completing three of the soil borings <br /> to 2 inch monitoring wells. It also proposes approximately 15 soil <br /> samples be analyzed for TPH as gas and BTEX. <br /> Monitoring wells MW1, MW3 , MW4, MW5, MW6, and MW7 are all more than <br /> 80 feet from the location of the former underground storage tank. <br /> When these wells were installed some soil samples from depths of 5 <br /> to 40 feet were analyzed and contaminants were not detected, <br /> although the detection limits for BTEX were high. Since this soil <br /> information is not close to the former tank location, the lateral <br /> extent of soil contamination close to the tank area was rfever <br /> defined. Soil information will be obtained from the installation <br /> of the monitoring well close to MW2 (installed in the former tank <br /> pit) . Additional soil information should be provided by the <br /> installation of a soil boring on the opposite side of- the farmer <br /> tank location from where the monitoring well will be installed. <br /> When MW2 was installed soil samples from 15, 25, and 35 feet below <br /> grade evidenced contamination. Organic vapor readings taken during <br /> the installation of the vapor extraction well (also installed in <br /> the former tank pit) were high from 15 to 50 feet below grade. <br /> Therefore, several soil samples from.the soil boring and monitoring <br /> well installed near the former tank pit should be analyzed. <br /> Free product existed in MW1 until it went dry so several soil <br /> samples from 35 feet below grade to current water level should be <br /> analyzed when installing the monitoring well near MW1. Since <br /> contamination evidenced in MW3 was low, fewer soil ' samples will <br /> r <br /> A Division of San Joaquin County Health Care Services <br />