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California Regional Water Quality Coiltrol Board <br /> vCentral Valley Region <br /> Robert Schneider,Chair <br /> Winston H.Hickox Gray Davis <br /> SecretaryJor Sacramento Main Office Governor <br /> Environmental httemet Address: http://w .swreb.ca.gov/mgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> 21 June 2001 <br /> Mr. Mark Peterson <br /> 10967 Copperopolis Road <br /> Stockton, CA 95215 <br /> SUBJECT. DOMESTIC WELL SAMPLING AT 10967 COPPEROPOLIS ROAD, STOCKTON, <br /> SAN JOAQUIN COUNTY <br /> As an initial site assessment relating to the underground storage tanks at the former Countryside Market, <br /> staff sampled six domestic water supply wells in close proximity to the Countryside Market location. <br /> Your domestic well is approximately 200 feet northeast of the former Countryside Market site. <br /> Your domestic well was sampled on 24 April 2001, and again on 23 May 2001. On both dates, the <br /> holding tank was purged approximately five minutes until the pump turned on, and then a sample was <br /> collected from a hose bib at the wellhead. A clean brass hose connector and a one-foot piece of <br /> disposable polyethylene tubing were used to transfer the water sample from the hose bib into sample <br /> containers provided by the laboratory. The sample containers were labeled, placed directly into a pre- <br /> cooled ice chest with ice, and submitted to California Laboratory Services (CLS) in Rancho Cordova for <br /> analysis. The 24 April samples were analyzed by EPA Method 8260B for volatile organic compounds, <br /> and the 23 May samples were analyzed by EPA Method 8260B for volatile organic compounds,by EPA <br /> Method 8015M for gasoline, and by EPA Method 200.8 for organic lead. On both sampling dates, the <br /> sample was designated"CSM10967" for 10967 Copperopolis Road domestic well. The trip blank for <br /> 24 April was designated "TCMW-2" and the trip blank for 23 May was designated"CSM10710". <br /> As related to you by telephone on 21 May 2001 and again on 25 May 2001, 1,2-dichloroethane <br /> (1,2-DCA) was identified in your domestic well water sample above drinking water standards. The <br /> analytical results of sampling are presented in the table below, and copies of the results are attached. <br /> Analytical Results of Domestic Well Sam lin 1 <br /> Sample ID /Date Sampled 1,2-DCA 1 Gasoline 1 Lead 1 <br /> CSM10967, 4/24/01 73 Not Analyzed Not Analyzed <br /> TCMW-2 (trip blank <0.5 Not Analyzed Not Analyzed <br /> CSM10967, 5/23/01 55 <50 <5 <br /> CSM10710 (trip blank <0.5 Not Analyzed Not Analyzed <br /> Notes: 1. 1,2-DCA by EPA Method 8260B, gasoline by EPA Method 8015M, and lead by <br /> EPA Method 200.8 <br /> 2. µg/1=micrograms per liter, or parts per billion <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. <br /> For a list of simple ways you can reduce demand and cut your energy costs,see our Web-site at httpJ/www.swrcb.ca.gov/mgcb5 <br />