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PUBLrC HEALTH SERVICESAQu�N c <br /> SAN JOAQUI N COUNTY r' <br /> JOG]KHANNA IN1.D-M.P.H. <br /> Health Officer <br /> P.Q. Box 2009 • (1601 East Hazelton Avenue) • Stockton,California 95201 oq i k o <br /> (209)468-3400 <br /> JUAN QUIJANO CL i_i <br /> J <br /> TRI VALLEY GROWERS ASSOCIATION <br /> ENVIRONMENTAL SERVICES <br /> P O BOX 1211 FEB 2 5 199- <br /> MODESTO CA 95353 <br /> RE: Tri Valley Plant T SITE CODE. 1920 <br /> 26200 North Galt Road <br /> Thornton CA 95686 <br /> A beneficial meeting was recently held on February 16, 1993 and was attended by yourself, Chris Dozier, <br /> Bob Bennett, Chris Savage, and Dan Wallace representing Tri Valley Growers. Bill Channell represented <br /> RESNA Industries. San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS/EHD) was represented by Margaret Lagorio and Mary Meays. PHS/EHD has prepared the following <br /> comments to summarize the meeting. <br /> The meeting began with a discussion of historical data including, residual soil contamination, soil lithology <br /> and graphic representation of analytical results since the current groundwater remediation system became <br /> operational. Next the use and construction of the neighboring domestic well was discussed. It is thought <br /> that the well is used for irrigation. The well's construction is unknown, but it is thought to have been <br /> installed in the 1920's. <br /> Tri Valley representatives indicated that for at least the next two years Tri Valley's financial resources, <br /> available for remediation at this site, would be limited. <br /> The current groundwater remediation system, groundwater extraction and treatment followed by discharge <br /> under NPDES permit, is relatively inexpensive and will continue to be used until such time as groundwater <br /> remediation is no longer necessary. PHS/EHD staff indicated that evaluation of analytical results from the <br /> remediation system has not shown significant decreases in petroleum hydrocarbon contamination. <br /> PHS/EHD staff did agree that the system appeared to be providing groundwater contamination plume <br /> containment, but felt that the system was having limited success, in removing contaminants. <br /> The remediation of residual soil contamination will not commence until additional funds are available. <br /> PHS/EHD staff expressed concern that without soil remediation occurring simultaneously, groundwater <br /> would continue to be impacted by soil contaminants leaching into groundwater. <br /> Agreements which were reached during the meeting for additional work and evaluation are listed below. <br /> 1. Continued quarterly monitoring with groundwater sampling at the current frequency. <br /> Monitoring wells, MW1 and MW6, and the remediation system influent (MW4) and <br /> effluent, are sampled quarterly. Monitoring wells MW2, MW3, and MW5 are sampled <br /> twice yearly. <br /> A Division of San Joaquin County Health C-are Services 1i1 <br />