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California Ronal Water Quality Antrol Board ` <br />Central Valley Region i <br />Steven T. Butler, Chair <br />Winston H. Hickox Gray Davis <br />Secretaryfor Sacramento Main Office Governor <br />Environmental Internet Address: http://www.swrcb.ca.gov/—rwgcb5 <br />Protection 3443 Routier Road, Suite A, Sacramento, California 95827-3003 <br />Phone (916) 255-3000 • FAX (916) 255-3015 <br />13 September 1999 <br />Mr. Eric Jenks <br />John Taylor Fertilizers Company Inc. <br />841 West Elkhorn Blvd. <br />Rio Linda, CA 95673 <br />CONDITIONAL APPRO b AL OF SITE I VVESTICATION WORK PLAN; JOHN TAYLOR <br />FERTILIZERS, STOCKTON, SAN JOA Q UIN CO UNTY <br />I have reviewed the Site Investigation Work Plan (work plan) dated 1 July 1999 submitted by GeoSyntec <br />Consultants, Inc. on behalf of the John Taylor Fertilizer facility in Stockton. The work plan summarizes <br />the Phase I/Phase II Environmental Site Assessment and proposes a direct push groundwater sampling . <br />investigation. Identified groundwater contaminants include nitrate, ammonia, petroleum products, <br />volatile organic compounds, chlorinated herbicides, and fumigants. Identified soil contaminants include <br />ammonia, xylene, toluene, butanone, chlordane, dinoseb, and a metam-sodium breakdown product <br />(MITC). <br />The direct push sampling plan proposes to grid the interior of the eastern portion of the site where <br />products are most likely to have been handled. Additional areas that may have been exposed to products <br />include outside the door to the pesticide warehouse and the western equipment storage area. These areas <br />also should be included in this groundwater investigation. In addition to the proposed suite of chemical <br />analyses, representative samples obtained from the areas of the former tank farm, the applicator wash <br />area and the pesticide warehouse door should be analyzed for carbamate/urea compounds, organo - <br />phosphorous pesticides, and organo -nitrogen pesticides. <br />The work plan suggests conducting a file review for the underground storage tank removal information. <br />In addition, there may also be information available describing the soil excavation beneath the former <br />liquid fertilizer tank farm. A report of excavation sampling results could preclude the need for <br />additional testing in the vicinity of the former tanks. <br />The work plan is approved subject to the following conditions: <br />1) A groundwater sample shall be obtained near the door to the pesticide warehouse and from the <br />western equipment storage area. <br />2) Representative samples obtained in the areas of the former tank farm, the applicator wash area and <br />the pesticide warehouse door shall be analyzed for carbamate/urea compounds, organo - <br />phosphorous pesticides including disulfoton and chlorpyrifos, and organo -nitrogen pesticides <br />(including atrazine) in addition to the analytical suites recommended in the work plan. <br />California Environmental Protection Agency <br />Ca Recycled Paper <br />