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STATE OF CALIFORNIA Environmental Prn Agency PETE WILSON, Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION ""VIRONAfENT <br /> 3443 Routier Road, Suite A PFRM1T C RVjC Jit q, � s <br /> Sacramento, CA 95827-3098 +' J !T Y UAL tE 1 '� <br /> PHONE: (916) 255-3000 95 JAN 20 Py 1: 50 <br /> FAX: (916) 255-3015 <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 COPY <br /> NOTIFICATION OF POTENTIAL THREAT TO DRINKING WATER <br /> Over 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 staff's 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 not 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 in 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, I can be reached at (916) 255-3101, or you may contact Wendy Wyels at <br /> (916) 255-3104. <br /> RUDY J. SCHNAGL, Chief <br /> Agricultural Regulatory Unit <br /> cc: Mr. Nick Nickerson, Unocal Environmental Remediation & Technology, San Ramon <br />