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CalifornifFegional Water Quality Cool Board : :. _ <br /> Central Valley Region <br /> Karl E. Longley,ScD,P.E.,Chair " <br /> ... <br /> Linda S.Adams Arnold <br /> Secrelaryfor 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 Schwarzenegger <br /> Environmental <br /> Phone(916)464-3291 •FAX(916)464-4645 Governor <br /> Praection rion hitp://www.waterboaTds.ca.gov/centTalvalley <br /> RECOV\VAI <br /> ED <br /> 12 August 2008 AUG 14 2008 <br /> ENVIRONMENT RIH <br /> PERMIT/SERVICES <br /> Kirk Williams <br /> Agrium <br /> 6 Executive Drive <br /> Collinsville, IL 62234-6120 <br /> NORTH AND SOUTH POND AREAS CHARACTERIZATION WORK PLAN, ZVI PILOT <br /> STUDY, WESTERN FARM SERVICE STOCKTON, 1905 BROADWAY, SAN JOAQUIN <br /> COUNTY <br /> In 1996, Western Farm Service (now owned by Agrium) purchased the agricultural chemical <br /> distribution facility that has been operating under various ownerships at this site since the <br /> 1960s. Groundwater contains fertilizer and pesticide pollutants and in 2006, Western Farm <br /> Service implemented a pilot study which is evaluating a zero-valent iron formulation to treat <br /> these pollutants insitu. <br /> Between the 1960s and the mid-1980s, two evaporation ponds received pesticide rinsates and <br /> dilute fertilizer solutions. In 1995, the ponds were excavated to a depth of about three feet, <br /> backfilled, and covered with an engineered cap. Limited soil sampling conducted in the mid- <br /> 1990s and a continuing presence of fertilizers and pesticides in groundwater lead California <br /> Regional Water Quality Control Board, Central Valley Region (Regional Water Board) staff to <br /> conclude that constituents of concern remain in soil beneath the former ponds. <br /> The progress of the pilot study and a work plan to investigate soil pollutants beneath the <br /> ponds are presented in the following reports prepared by Geosyntec Consultants. <br /> 15 April 2008 Pilot Test Evaluation Report <br /> 1 July 2008 Former North and South Pond Areas Characterization Work Plan (North and <br /> South Pond Work Plan) <br /> Regional Water Board staff reviewed these documents and provide the following discussion. <br /> Pilot Test Evaluation <br /> The zero valent iron injectant was coated with chitin, a slow-release carbon substance which is <br /> marketed as EHCTM. This product was injected into the pilot study grid in October 2006, and <br /> its performance is monitored by monitoring wells PM-1 and PM-2, located 10 and 20 feet <br /> California Environmental Protection Agency <br /> Qa <br /> Recycled Paper <br />