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PUBLICIEALTH SERVICES <br /> SAN JOAQUIN COUNTY z' <br /> a: Z� <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Ernest M. Fujimoto, M.D., M.P.H., Acting Health Officer <br /> �/FORS <br /> 445 N. San Joaquin Street • P.O. Box 388 • Stockton, CA 95201-0388 <br /> (209) 468-3420 <br /> JOHNJOHNSON <br /> THE CUSTOMER COMPANY C (OPY <br /> P O BOX 886 <br /> BENICIA CA 94510 <br /> FEB 0 3 �9g� <br /> RE: 15 EAST GRANT LINE ROAD SITE CODE: 1404 <br /> TRACY CA <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) has completed the review of the "Remedial Action Work Plan Additional <br /> Information" letter dated December 15, 1994, submitted by Trans Tech Consultants, <br /> and has the following comments for your consideration. <br /> On January 25, 1995, PHS/EHD requested technical guidance from the California <br /> Regional Water Quality Control Board, Central Valley Region (CVRWQCB) regarding <br /> the proposal for bioremediation at this site. Based on comments received from the <br /> CVRWQCB, additional site characterization and feasibility studies must be conducted <br /> at the site before bioremediation can be proposed for corrective action. <br /> According to the CVRWQCB, a proposal for bioremediation is premature without the <br /> completion of a complete site assessment (soil and groundwater), a number of <br /> preliminary feasibility studies, and a satisfactory pilot study. <br /> The proposal submitted to this office is deficient in the following areas: <br /> 1) Site assessment to determine full extent of the contamination is not yet <br /> complete. <br /> 2) The soil at the site should be characterized for the following: moisture <br /> content, porosity, nitrogen content, phosphorous content, and naturally <br /> occurring biological content. <br /> 3) Groundwater pumping and vapor extraction tests should be performed at <br /> the site. <br /> 4) For anaerobic bacteria, nitrogen and methane, in addition to carbon <br /> dioxide and oxygen must be monitored. According to the CVRWQCB, <br /> A Division of San Joaquin County Health Care Services <br />