FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

California Ref conal Water Quality Control Board r ' h Central Valley Region , Winston H.Hickox Sacramento Main Office Gray Davis Secretaryfor Internet Address: http://www.sweb.ca.gov/- wgcb5 Governor Environmental 3443 Routier Road,Suite A,Sacramento,California 95827-3003 Protection Phone(916)255-3000•FAX(916)255-3015 24 April 2002 , Mr. Maurice Benson APR 2 9 2002 Defense Logistics Agency Defense Distribution Depot San Joaquin CA (DDJC), Sharpe Site ENT' DDJC-FA, Attn: Environmental, Building 100, Room 2 25600 Chrisman Road Tracy, CA 95376-5000 REQUEST TO PROVIDE ALTERNATIVE DRINKING WATER SUPPLIES TO OWNERS OF PRIVATE WATER WELLS PW020 AND PW021 The Central Valley Regional Water Quality Control Board is concerned about the detection of volatile organic compounds (VOCs) in two private wells located near Defense Distribution Depot San Joaquin's Sharpe facility(DDJC-Sharpe). Tetrachloroethene (PCE) and/or trichloroethene (TCE) are consistently detected in private wells PW020 and PW021, located near the north end of DDJC-Sharpe. These contaminants originate from the North Balloon area on the Sharpe facility and are part of what is commonly referred to as the "North Balloon plume". The Draft FFA Annual Progress Report, December 2000 through September 2001 (URS, December 2001) shows that TCE was detected in 3 of 4 quarters in well PW020 at concentrations ranging from 1.0 to 1.4 µg/L. In well PW021,PCE was detected in 2 of 4 quarters at concentrations ranging from 0.6 to 0.8 µg/L. TCE was also detected at a concentration of 1.3 gg/L in well PW021 in the second quarter of 2001. The State of California Office of Environmental Health Hazard Assessment (OEHHA) recently adopted Public Health Goals (PHGs) for both PCE and TCE. PHGs are based entirely on public health considerations and represent concentrations in drinking water at which no adverse health effects are expected to occur from a lifetime of exposure. The PHGs for PCE and TCE are 0.06 gg/L and 0.8 µg/L,respectively. Concentrations of TCE and/or PCE in wells PW020 and PW021 exceed these PHGs. Based on DDJC-Sharpe's response to our questions (IJRS email, Response to Comments on Draft FFA Annual Report, 3 April 2002) on the status of private wells PW020 and PW021, it appears that these wells are the only source of drinking water currently available to the property owners. Therefore, we request that DDJC-Sharpe provide alternative drinking water supplies to the owners of PW020 and PW021. These alternatives may include installing wellhead treatment to remove the contaminants, installing a replacement well screened in portions of the local aquifer system unaffected by DDJC- Sharpe's plumes, subsidizing a connection to a City of Lathrop water main, or subsidizing delivery of California Environmental Protection Agency �d Recycled Paper