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Eowvu G.Brtw+i Jn. <br /> GALlieaelA i� MAmEa ROo.aouEL <br /> Water Boards <br /> Central Valley Regional Water Quality Control Board <br /> 17 May 2012 <br /> Mr. Eric Jenks <br /> Wilbur-Ellis Company <br /> P.O. Box 1030 <br /> Marysville, CA 95901 <br /> REVIEW OF PHASE 11 DEEPER GROUNDWATER INVESTIGATION RESULTS AND <br /> PHASE 111 INVESTIGATION WORK PLAN, JOHN TAYLOR FERTILIZERS CO. <br /> STOCKTON, SAN JOAQUIN COUNTY <br /> Staff of the California Regional Water Quality Control Board, Central Valley Region <br /> (Central Valley Water Board) has reviewed the Phase 11 Deeper Groundwater <br /> Investigation Results (Report) and Phase Ill Investigation Work Plan (Work Plan), dated <br /> 15 December 2011 for the subject site, located at 1819 South Argonaut Street in <br /> Stockton, San Joaquin County, California (Site). The Report and the Work Plan was <br /> prepared on behalf of John Taylor Fertilizers Co. (JTF)/Wilbur-Ellis by Geosyntec <br /> consultants. <br /> Background <br /> A retail outlet and distribution center for agricultural chemicals and pesticides was <br /> formerly located at the Site. Several groundwater investigations have been conducted <br /> at the Site from 1999 to 2010. Site investigations show that the pesticides 1,2- <br /> dichloropropane (1,2-DCP) and 1 ,2,3-trichloropropane (1,2,3-TCP) are found in shallow <br /> and deep groundwater. A cone penetration test (CPT) investigation conducted in 2009 <br /> found contaminants in groundwater at approximately 50-80 feet below ground surface <br /> (bgs). Four onsite wells, screened from 56.3 to 80.5 feet bgs were installed in August <br /> 2010 to confirm the direction of groundwater gradient. These investigations show that <br /> pesticides from the facility have leached into the groundwater and have migrated off the <br /> Site towards the east. <br /> 2011 Phase II Investigation <br /> In September and October 2011, JTF conducted the Phase II cone penetration test CPT <br /> Investigation, in accordance with the Phase II Deeper Groundwater Investigation Work <br /> Kwl_E. Lammcr SaD,P.E.,amm I PAMLIA C.CFmxmm P.E.,WEE,mUWA V!oFFWLm <br /> 11 G2G Sun Cama oetya rZM gendw Coro w*6 CA ti M I www.weLwbWftC&9M%W WV811" <br /> Ci mpevoi—rsrra <br />