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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> �P <br /> 304 East Weber Avenue, Third Floor • Stockton, CA 95202// ` <br /> i ;...� <br /> 209/468-3420 <br /> ELLEN AQUARO <br /> SAN JOAQUIN COUNTY CAPITAL PROJECTS AUG 0 6 1997 <br /> 222 E WEBER AVE RM 678 <br /> STOCKTON CA 95202 <br /> RE: San Joaquin County Human Services Building SITE CODE: 1257 <br /> 145 South Sutter Street, Stockton CA 95202 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has completed review <br /> of the"Fourth Quarter Groundwater Sampling Report"dated July 1997 and prepared by Weston. PHS/EHD <br /> has the following comments for your consideration. <br /> The analytical results from samples collected on May 20 and 21, 1997 continued to evidence significant <br /> groundwater contamination of up to 5,400 ppb benzene and 17,000 ppb TPH-gasoline. Please note that Table <br /> A-2 Historical Groundwater Analytical Results erroneously indicated that 1,400 ppb total xylene was detected in <br /> the sample from MW2A collected on May 21, 1997 when in fact the laboratory report indicated that 1,800 ppb <br /> total xylene was detected. Please submit a corrected table. <br /> PHS/EHD requested in correspondence dated November 20, 1997 that once the results of the fourth quarter <br /> (October through December 1996) are available a corrective action plan be prepared pursuant to the California <br /> Underground Storage Tank Regulations and the Health and Safety Code. PHS/EHD agreed to extend the due <br /> date for submittal of the corrective action plan to allow for the collection of two additional quarters of <br /> groundwater samples. The results submitted for the second quarter of 1997 continue to evidence significant <br /> groundwater contamination warranting remediation. <br /> It must be noted that some feasibility testing will be necessary to evaluate remedial alternatives as part of the <br /> corrective action plan preparation process. A common non-invasive remedial approach is vapor extraction. <br /> Given the current groundwater depth (approximately 32 feet below ground surface)which has submerged all <br /> but one well's screened interval (most are screened between 43 and 63 feet below ground surface), it will not <br /> be possible to perform an accurate vapor extraction pilot test. Please give some consideration to the <br /> installation of at least two vadose zone wells which may be used to perform the feasibility analysis and for use <br /> if vapor extraction is selected as the remedial alternative to implement. <br /> Please also recall that PHS/EHD has requested that the depth to water be included on all groundwater <br /> analytical results summary tables. While the groundwater elevation was noted on the table, the wells have <br /> been surveyed at least twice making evaluation of changes in the static water level difficult to correlate. <br /> A corrective action plan with all required elements should be submitted by December 31, 1997. PHS/EHD <br /> would be pleased to provide any further direction or information which you require. If you have any comments <br /> or questions, please do not hesitate to contact me at (209)468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> '_ /�/ <br /> "MW <br /> Mary Meays, Se or REHS Margaret Lagorio, REHS <br /> Site Mitigation Unit Lead Senior <br /> cc: Elizabeth Thayer, CVRWQCB Michael Smith, Director of Health Care Services <br /> Bill Mitchell, Director of Public Health Services Frances Okamoto <br /> Carla Brasaemle, Weston Brooke Birkie, Nuemiller and Beardslee <br /> A Division of San Joaquin County Health Care Services <br />