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PUBLI&dEALTH SER'VvCES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION �= ` <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 trFos� <br /> (209) 468-3420 <br /> �J D <br /> EDNA ROLLERI & DONNA BRUNO v <br /> ESTATE OF ANGELO ROLLERI a �9g <br /> 436 W MARIPOSA AVENUE OGT <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 Division <br /> (PHS/EHD) has reviewed the "Quarterly Report" dated August 26, 1994 prepared by <br /> Geological Audit Services, Inc. for the above referenced site. <br /> The report details the results of the confirmation borings CB1 and CB2, the <br /> installation of monitoring wells MW8 and MW9, and the results of the water <br /> samples obtained from ext-raction well EW1 and monitoring wells MW8 and MW9. <br /> There was odor to the soil from 20 feet to 40 feet below grade when drilling CB1 <br /> and the soil sample results from 20 feet and 35 feet evidenced total petroleum <br /> hydrocarbons as gasoline (TPH-g) at 300 parts per million (ppm) and 2200 ppm <br /> respectively. There was odor to the soil from 35 feet to 45 feet below grade <br /> when drilling CB2 and the soil sample results from 30 feet and 35 feet evidenced <br /> TPH-g at 39 ppm and 450 ppm respectively. Seasonal high depth to groundwater at <br /> this site in Spring 1986 was 40 feet below grade. Therefore, the contamination <br /> remaining is a threat to groundwater and further remediation is required. <br /> The groundwater flow was determined to be to the northeast. PHS/EHD recommends <br /> monthly measurements of the depth to groundwater be taken and groundwater flow <br /> determined in order to confirm the groundwater gradient. After the gradient is <br /> confirmed the existence of a down-gradient well can be determined. If a down- <br /> gradient well does not ex'st, then another monitoring well will be required to <br /> be installed in the down-gradient direction. <br /> The monitoring wells were sampled on September 16, 1994. A plan for continuing <br /> remediation of the site should be included in the quarterly report that discusses <br /> the September 16, 1994 water sample results. <br /> If you have any questions contact Margaret Lagorio at (209) 468-3449. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> Margaret Lagorio, Lead Senior REHS Diane Hinson, REHS <br /> Site Mitigation Unit Supervisor <br /> ML <br /> C! Geological Audit Sem-rices <br /> c: CVRWQCB - Beth Thayer <br /> A Ilii inion of San Joaquin County Health Cure Service~ <br />