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ba'd i176 ,r1Ml z 5 <br /> b0'd �H101 7i:60 966i-9Z—NHt <br /> $;ATE OF CAUFORNIA -En-,.nmantal Protection A pQy - = <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD PETE LSON, Gowmor <br /> CENTRAL VALLEY REGION <br /> 3443 ROVtlar ROad, Suita A <br /> Sacramento, CA 95 82 7-30 98 ! 611,PMONE: (918) 255-3000 TI ,S� LTftFAX: 19181255-3015 R111. <br /> 9S JAN 20 plf 1. SQ <br /> 19 January 1995 <br /> Ms. Donna Heran <br /> Director, Division of Environmental Health <br /> San Joaquin County Public Health Department <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <br /> NOTIFICATION OF POTENTIAL ,'THREAT TO DRIN%ING WATER COPYOver the last several years, Regional Board staff have overseen a site investigation at the former <br /> PureGro/Brea Ag facility at 1905 N. Broadway Avenue in Stockton. Pesticides and nitrates were <br /> detected in facility soils, and four monitoring wells were subsequently installed. Quarterly <br /> monitoring has identified a plume of the pesticide 1,2-dichloropropane (1,2-DCP) beneath the <br /> facility. At staffs request, the Discharger installed and sampled two off-site monitoring wells in <br /> November 1994. <br /> The two wells are located on Sutro Avenue. The well to the north, at Sutro Avenue and Charles <br /> Street, contained 42 ppb of 1,2-DCP. The California Maximum Contaminant Level for 1,2-DCP is <br /> 5 ppb, The extent of the plume has knot yet been determined; the Discharger will soon be required <br /> to install additional off-site monitoring wells. <br /> The discovery of the off-site plume of 1,2-DCP does not meet the criteria for a Proposition 65 <br /> notification. However, because of the shallow domestic wells is the Sutro Avenue area, we feel that <br /> San Joaquin County Public Health should be formally made aware of the potential threat to drinking <br /> water posed by this plume. This letter serves as that notification. <br /> Staff will continue to oversee the investigation and remediation of this plume, and will continue to <br /> keep your staff informed as to our progress. <br /> If you have any questions, 1 can be reached at (916) 255-3101, or you may contact Wendy Wyels at <br /> (916) 2555-3104. cr� <br /> RUDY J. SCHNAGL, Chief <br /> Agricultural Regulatory Unit <br /> cc: Mr. Nick Nickerson, Unocal Environmenral Remediation & Technology, San Ramon <br /> b0'd S106"s Ol WOdd WHbt:F,R C49T-C7-Ta <br />