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California Ronal Water Quality *ntrol Board <br /> _ Central Valley Region B <br /> Peter M.Rooney Sacramento Alain Office Ed J.Schnabel <br /> Secretary for Internet Address: http://www.swrcb.ca.gov/—rwgcb5/home.htmi Chair <br /> Environmental 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Protection Phone(916)255-3000-FAX(916)255-3015 <br /> 27 July 1998 <br /> Ms. Nancy Bishop <br /> Western Farm Service <br /> 3650 Mt. Diablo Boulevard, Suite 260 <br /> Lafayette, California 94549 <br /> REVIEW OF DOCUMENTS FOR WESTERN FARM SERVICE SITE IN VERNALIS, <br /> SAN JOAQUIN COUNTY <br /> I have reviewed the 29 January 1998 1997 Annual Report and Results of December 1997 <br /> Groundwater Monitoring, 29 April Results of March 1998 Groundwater Monitoring, and 21 May <br /> Investigation Report: Results of Deep Groundwater Investigation, Additional Well Installation, and <br /> Domestic Well Sampling for the Western Farm Service site at 35100 South Highway 33, Vernalis. <br /> These reports were prepared by GeoSyntec Consultants, your consultant. The April monitoring <br /> report is acceptable. The following are my comments on the other reports. <br /> 1. The first page of the January report states groundwater data for five quarters are included in the <br /> report. On page two the reports states six quarters of groundwater monitoring have been <br /> performed. Data from five sampling events are presented in tables in the report. Text needs to <br /> be consistent with data presented. <br /> 2. In the May report, results of water samples collected from the two deep cone penetrometer <br /> borings show pesticides have not migrated to deeper water bearing zones, and fertilizer <br /> compounds are below levels of concern. Therefore, no additional sampling of deeper <br /> groundwater is necessary at this time. <br /> 3. The May report did not show the location of the domestic well at 34960 South Highway 33 on <br /> Figure 2 or Figure 3. The report also did not include a log showing where this well is screened <br /> and the depth to groundwater in the well. <br /> 4. New monitoring wells MW-4 and MW-5 provide additional definition of the extent of <br /> contaminants upgradient and downgradient of the site. However, these wells do not entirely <br /> characterize the plume of contaminants, nor does the current well network provide long term <br /> monitoring of the entire plume. Definition of the lateral extent of contaminants in groundwater <br /> is needed north of well MW-2. Also, water samples from well MW-5 and grab water samples <br /> collected in May 1997 showed nitrate above 10 mg/1 downgradient of wells MW-2 and MW-3. <br /> California Environmental Protection Agency <br /> fir?Recycled Paper <br />