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SCOTT VINCENT <br /> PAGE 2 <br /> this time. Any test wells needed for gathering data on the <br /> feasibility of various remediation alternatives should be <br /> installed and any preliminary tests should be completed during <br /> this next phase of field work. <br /> The contamination noted in the septic pit during the drilling of <br /> monitoring well #4 at a depth of approximately 25-30 feet BGS was <br /> also discussed. Although PHS/EHD is not the lead agency for <br /> oversight of the mitigation of this soil contamination plume, it <br /> will need to be addressed at some point in the future for <br /> complete clearance of this property as a contaminated site. <br /> The need for reliable data during this investigation was also <br /> discussed at the meeting. Proper detection limits and quality <br /> control/quality assurance data help to provide an indication that <br /> the data presented is reliable and representative of actual site <br /> conditions. Complete chain of custody forms that follow the <br /> samples handling route and condition from the field to the <br /> laboratory are also an indication of reliable data. <br /> At times where field observations (i.e. petroleum odors or <br /> discoloration of the soil) conflict with the laboratory data, a <br /> conservative approach is usually taken and the data is suspected <br /> as unreliable. Additional confirmation testing is usually <br /> required in these cases. <br /> The groundwater should continue to be tested for fecal coliform <br /> and total lead at this time. If you would like to reduce the <br /> frequency of groundwater sampling events, the number of wells to <br /> be sampled or the constituents to be analyzed for per sampling <br /> event, you may submit a modified sampling plan to this office for <br /> review and concurrence. <br /> If you have any questions please contact Linda Turkatte, REHS, of <br /> my staff at (209) 468-0339. <br /> Jogi Kh rha., M.D. M.P.H. <br /> Healt Ocer J <br /> G <br /> urie A. otu a, EHS, Program Manager <br /> environmental Health Division <br /> LAC/lt <br /> c: Beth Thayer-CVRWQCB <br /> c: Erich Beringer-AREG <br /> 400 E. Main St. , Third Floor <br /> Stockton, Ca. 95290 <br />