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TH SER'v4CESPUBLICHEALoPQu1N.-.�o SAN JOAQUIN COUNTY '' ENVIRONMENTAL HEALTH DIVISION . .< Erxtest M. Fujimoto, M. D., M.P.H., Acting Health Offic iy 304 East Weber Avenue, Third Floor • Stockton, CA 95t02 4A.fi=oR�'�! 209/468-3420 �r am 21 1Wi i CRAIG OGATA SAN JOAQUIN COUNTY FACILITIES MANAGEMENT 222 E WEBER RM 675 STOCKTON CA 95202 Re: Agricultural commissioner's Office Site Code: 1793 503 East Tenth Street, Tracy CA 95376 San Joaquin County Public Health Services, Environmental Health Division (PHS/EHD) has completed review of the "Work Plan" dated June 18, 1997 that was prepared by Ramage Environmental. PHS/END has the following comments for your consideration. The work plan proposed twelve soil boring locations which will be advanced using a direct push rig to determine the lateral and vertical extent of the soil contamination evidenced at the time of the October 28, 1988 tank removals. The work plan also proposed to evaluate the nature and extent of groundwater contamination, first by collecting grab groundwater samples and then by installing a minimum of three monitoring wells. The work plan stated that the'borings would be advanced to a maximum depth of 20 feet below ground surface (bgs). Since significant soil contamination up to 4,800 ppm extractable TPH, 760 ppm TPH-gasoline and 27 ppm benzene was detected at 9 feet bgs, it may be necessary to advance the soil boring to depths greater than 20 feet, in order to determine the vertical extent of the soil contamination, regardless r of the water depth encountered. It may be necessary that more than two soil samples per borehole be analyzed to characterize the distribution of the soil contamination. Also, additional analyses may be necessary to characterize additives, other than fuel hydrocarbons, that may have been used in the weed oil formulation process. The work plan indicated that the continuous cores and soil samples would be field logged. Pursuant to the Business and Professions Codes all geological interpretive activities must be done under the direct supervision of a registered professional geologist. The work plan stated that the soil boring would be abandoned with bentonite chips that will be hydrated. Please note that boreholes shall be abandoned using an approved cement/bentonite slurry which is placed from the bottom up using a tremmie pipe. Once field activities are completed and prior to submittal of the soil samples to the laboratory, PHS/EHD must be contacted to discuss-which samples will undergo analysis. The summary report should include a table with all soil and groundwater sample results obtained from the site and any recommendations for further investigation and/or remediation, including the locations of the proposed monitoring wells. Please contact the State Water Resources Control Board Cleanup Fund Unit to obtain pre-approval. If you have not done so already, you should submit a Cleanup Fund application. PHS/EHD can assist you in the preparation of the. application. Please submit three permit applications with $89 per application along with a City of Tracy encroachment permit and the neighboring property owner's written permission for offsite access. Please also contact me once the drilling is scheduled and at least two work days.prior to initiating field activities so that inspections may be schedule. If you have any questions, comments or wish to schedule field inspections, please contact me at(209) 468-0337. Donna Heran, Director, REHS Environmental Health Division Mary Meays, Senior FQS Margaret Lagorio, REHS Site Mitigation Unit Supervisor cc: Elizabeth Thayer, Central Valley Regional Water Quality Control Board cc: Joe Ramage, Ramage Environmental, 14670 Cantova Way, Ste. 200, Rancho Murieta CA 95683 r A Division of San Joaquin County Health Care Services