SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

Mr. Verrill Norwood 0 0 -2- Review 2-Review of DDRW-Tracy Annual Monitoring Report All Pure has evaluated the data presented in the April 1997 Well Monitoring Program 1996 Annual Monitoring Report submitted for the Tracy Defense Distribution Region West (DDRW) regarding sources of VOCs detected in three private wells north of All Pure. All Pure attributes the carbon tetrachloride and trichloroethylene detected in the private well identified by DDRW as PWO01 to the DDRW-Tracy; the detection of trihalomethanes, including chloroform, detected in PWO02 to chlorination of ground water by leakage of water treated for potable use, as stated in DDRW's 1996 annual report; and the detection of chloroform in PWO03 to a possible source at the Lyoth Loading Station. The ground water investigation to be conducted by All Pure offsite of its facility should help to determine if All Pure is or is not a source of VOCs in the private wells investigated by DDRW. All Pure suggests that further efforts are warranted to investigate Lyoth Loading Station for halogenated hydrocarbons. As I stated in my 24 December 1996 letter, there is no reason to suspect Lyoth Loading Station is a possible source of chloroform. This facility was a former bulk fuel loading station with one sampling event showing no detectable chlorinated hydrocarbons. Although elevated detection limits due to the presence of petroleum hydrocarbons were obtained from sampling one of the two monitoring wells, it is not likely that additional sampling will produce any better results. All Pure's proposal to install the one offsite monitoring well in the shallow zone is approved. All Pure must also investigate the extent of VOCs downgradient of HP-5 and the deep well must be installed downgradient of the two wastewater ponds, rather than upgradient as proposed. All new monitoring wells shall be added to the quarterly ground water monitoring program. All Pure needs to submit a proposal for disposal of drill cuttings and development and purge water, including all necessary laboratory analyses for any wastes proposed to be disposed onsite. Please submit this proposal and the chain of custody forms for the laboratory analyses included in the GWIR by 10 September 1997, along with a schedule to complete and report the results of the additional ground water investigation. If you have any questions, you may call me at (916) 255-3048. L, Q,4� 4-KPOLLY OWRY Associate Engineering Geologist PAL:pal/lsb cc: San Joaquin County Public Health Services, Stockton Mr. Tim Vickers, All Pure Chemical Company, Tracy Mr. Noel Lerner, Helmick and Lerner, Sacramento Recycled Paper Our mission is to preserve and enhance the quality of California's water resources,and I1� d ensure their proper allocation and efficient use for the benefit of present and future generations.