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PUBLIC FtEALTH SERVICES pOU!N <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D., M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor - Stockton, CA 95202 COC92 <br /> 209/468-3420JAMES M LANGSTON 9991 <br /> PO BOX 97 <br /> LATHROP CA 95330 <br /> RE: former Langston's Arco SITE CODE: 1503 <br /> 15615 S. Seventh St. <br /> Lathrop, CA., 95330 <br /> San Joaquin County Public Health Services, Environmental Health Division <br /> (PHS-EHD), has reviewed the "Quarterly Groundwater Sampling Report— <br /> September 1997" received October 20, 1997 and has the following comments. <br /> All quarterly monitoring reports are to include recommendations and conclusions. <br /> Please advise your consultant to include these requirements in all quarterly <br /> reports that are submitted. Recommendations should include any proposed <br /> investigation and a schedule of the sampling events. Conclusions in the <br /> quarterly report should be based on a qualified registered professional's <br /> evaluation of the data collected for this site to date. In the absence of a proposal <br /> to continue the subsurface investigation, a consideration for a risk-based <br /> approach for"No Further Action" should be discussed instead. A receptor <br /> survey, complete with an evaluation of any preferential pathways located in the <br /> area, and a soil fate and transport analysis should be included in any risk-based <br /> approach. <br /> In addition, PHS-EHD hereby clarifies any misunderstanding concerning the <br /> frequency of the sampling and monitoring of the wells for this site. Until further <br /> written notice from PHS-EHD, you are hereby directed to quarterly monitor <br /> and sample the existing monitoring wells for this site under an <br /> appointment scheduled with Michael Infurna with at least forty eight (48) <br /> working hours notice. The required report is to be submitted to PHS-EHD <br /> before the next quarterly sampling event. <br /> The Central Valley Regional Water Quality Control Board (CVRWQCB) has <br /> recommended recent changes in groundwater investigation and sample <br /> analyses. In order to comply with these requirements, PHS-EHD has adopted <br /> the enclosed policy for the collection and analysis of the listed gasoline <br /> oxygenates. Please advise your consultant to add the additional analysis to your <br /> quarterly monitoring procedures and include them in the fourth quarter-1997 <br /> monitoring event. <br /> A Division of San Joaquin County Health Care Services <br />