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1,C <br /> ESPUBLIC HEALTH SERV �P4 <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> M. D. . . . Acting Health Officer <br /> Ernest M. Fujimoto, r MPHr C"•., _ �P <br /> 304 E. Weber Ave., Third Floor • P. O. Box 388 • Stockton, CA 95201-0388 <br /> 2091468-3420 <br /> STELLA RUIZ MAILED MAY 2 31996 <br /> 4491 W DURHAM FERRY RD <br /> TRACY CA 95376 <br /> RE: Ruiz Grocery SITE CODE: 1551 <br /> 4491 West Durham Ferry Road <br /> Tracy CA 95376 <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHSIEHD) has reviewed the "Problem Assessment Report, Feasibility Study, and <br /> Remedial Action Plan" prepared by Clearwater Group, Inc. and dated February 21 , <br /> 1996. <br /> The report included the results of the soil sampling that occurred during the <br /> installation of RW1 , SW1 , and SW2 on April 7, 1995. The report also included the <br /> results of the October 19, 1995 and the January 5, 1996 groundwater sampling <br /> events. Feasibility studies including vapor extraction, groundwater extraction and <br /> air sparge were also conducted in December 1995 and the results were <br /> summarized in the report. Finally, the report proposed groundwater extraction and <br /> vapor extraction as the selected remedial alternatives to reduce the contamination <br /> source still remaining in the soil and the groundwater contamination which poses a <br /> threat to the onsite domestic well. <br /> Problem Assessment Report <br /> Only one soil sample was collected during the installation of RW1 at 14.5 feet in <br /> which 20 ppm TPH-diesel was detected. Both underground storage tanks which <br /> were removed in 1989 reportedly contained at one time either regular leaded or <br /> unleaded gasoline. The Pace lab report for the analysis indicated a footnote that <br /> early hydrocarbons were present, possibly representing kerosene or mineral spirits. <br /> The information from the installation of RW 1 was included previously with <br /> Clearwater correspondence dated July 7, 1995; however, discussion within the <br /> correspondence was limited to the proposed feasibility testing. It is unclear <br /> whether this detection of diesel was to infer that there may also be a diesel <br /> contamination problem; regardless, the table summarizing the soil results should <br /> also include a reference to the laboratory footnote. <br /> Free product from MW1 continues periodically, please summarize the storage and <br /> disposal of petroleum recovered. <br /> f <br /> 1 <br /> A Division of San Joaquin County Health Care Services <br />