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• �Water Boards Central Valley Regional Water Quality Control Board 17 May 2012 Mr. Eric Jenks Wilbur -Ellis Company P.O. Box 1030 Marysville, CA 95901 • REVIEWOFPHASEII DEEPER GROUNDWATER INVESTIGATION RESULTS AND PHASE III INVESTIGATION WORK PLAN, JOHN TAYLOR FERTILIZERS CO. STOCKTON, SAN JOAQUIN COUNTY Staff of the California Regional Water Quality Control Board, Central Valley Region (Central Valley Water Board) has reviewed the Phase II Deeper Groundwater Investigation Results (Report) and Phase 111 Investigation Work Plan (Work Plan), dated 15 December 2011 for the subject site, located at 1819 South Argonaut Street in Stockton, San Joaquin County, California (Site). The Report and the Work Plan was prepared on behalf of John Taylor Fertilizers Co. (JTF)/ Wilbur -Ellis by Geosyntec consultants. Background A retail outlet and distribution center for agricultural chemicals and pesticides was formerly located at the Site. Several groundwater investigations have been conducted at the Site from 1999 to 2010. Site investigations show that the pesticides 1,2- dichloropropane (1,2-DCP) and 1,2,3-trichloropropane (1,2,3 -TCP) are found in shallow and deep groundwater. A cone penetration test (CPT) investigation conducted in 2009 found contaminants in groundwater at approximately 50-80 feet below ground surface (bgs). Four onsite wells, screened from 56.3 to 80.5 feet bgs were installed in August 2010 to confirm the direction of groundwater gradient. These investigations show that pesticides from the facility have leached into the groundwater and have migrated off the Site towards the east. 2011 Phase II Investigation In September and October 2011, JTF conducted the Phase II cone penetration test CPT Investigation, in accordance with the Phase 11 Deeper Groundwater Investigation Work K,w6 E. Lonel.ev SOP, P.E., amm I PAmru% C. GFummK P.E., SCFE, ccwvme oF! cen 11 an Sun Cwxw OAv I2M flwx ho Co►dsm CA NOM I www.wshrb=da.e&UawAM V110iyr 0 wPovoi ■n mprw GDA- Eoww4o G. Bacwr Jn. REVIEWOFPHASEII DEEPER GROUNDWATER INVESTIGATION RESULTS AND PHASE III INVESTIGATION WORK PLAN, JOHN TAYLOR FERTILIZERS CO. STOCKTON, SAN JOAQUIN COUNTY Staff of the California Regional Water Quality Control Board, Central Valley Region (Central Valley Water Board) has reviewed the Phase II Deeper Groundwater Investigation Results (Report) and Phase 111 Investigation Work Plan (Work Plan), dated 15 December 2011 for the subject site, located at 1819 South Argonaut Street in Stockton, San Joaquin County, California (Site). The Report and the Work Plan was prepared on behalf of John Taylor Fertilizers Co. (JTF)/ Wilbur -Ellis by Geosyntec consultants. Background A retail outlet and distribution center for agricultural chemicals and pesticides was formerly located at the Site. Several groundwater investigations have been conducted at the Site from 1999 to 2010. Site investigations show that the pesticides 1,2- dichloropropane (1,2-DCP) and 1,2,3-trichloropropane (1,2,3 -TCP) are found in shallow and deep groundwater. A cone penetration test (CPT) investigation conducted in 2009 found contaminants in groundwater at approximately 50-80 feet below ground surface (bgs). Four onsite wells, screened from 56.3 to 80.5 feet bgs were installed in August 2010 to confirm the direction of groundwater gradient. These investigations show that pesticides from the facility have leached into the groundwater and have migrated off the Site towards the east. 2011 Phase II Investigation In September and October 2011, JTF conducted the Phase II cone penetration test CPT Investigation, in accordance with the Phase 11 Deeper Groundwater Investigation Work K,w6 E. Lonel.ev SOP, P.E., amm I PAmru% C. GFummK P.E., SCFE, ccwvme oF! cen 11 an Sun Cwxw OAv I2M flwx ho Co►dsm CA NOM I www.wshrb=da.e&UawAM V110iyr 0 wPovoi ■n mprw