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MONITORING AND REPORTING PROGRAM ORDER NO. R5-2008-0149-010 4 <br /> CONOCOPHILLIPS <br /> SAN JOAQUIN COUNTY <br /> s Wells sampled to evaluate migration of pollutants within the treatment zone. <br /> Wells used to develop background concentrations. <br /> e To be sampled before and after, and/or monthly, during the pilot study as indicated; then during the first and <br /> third quarters during full scale implementation of the corrective action. <br /> e Sample MW-1 through MW4, MW-20, and MW-26 during pilot study; then sample MW-1 through MW-4, MW-20 <br /> through MW-26 during full scale implementation of the corrective action. <br /> Table 2: Analytical Methods <br /> Maximum Practical <br /> Constituent Method' Quantitation Limit Frequency <br /> (Ng/L)a <br /> Suite A <br /> TPHg GC/MS 50 <br /> As indicated in <br /> BTEX, MTBE, TBA EPA 82608 0.50 (1.0 for total Table 1 <br /> xylenes, 5.0 for TBA) <br /> Suite B <br /> Metals, dissolved EPA 6010B 2.0 Seven times <br /> Total Chromium EPA 200.7' or 200.8' 10 Seven times <br /> Hexavalent Chromium EPA 7199 2.0 Seven times <br /> Bromide EPA 300.0 100 Seven times <br /> Bromate EPA 300.1 10 Seven times3 <br /> ' Or an equivalent EPA Method that achieves the maximum Practical Quantitation Limit. <br /> 2 All concentrations between the Method Detection Limit and the Practical Quantitation Limit shall be reported as <br /> an estimated value. <br /> 3 Will be sampled seven times: one baseline sample prior to remediation and monthly samples during the six <br /> month pilot test <br /> 4 Metals include barium cadmium, calcium, copper, lead, magnesium, manganese, mercury, molybdenum, and <br /> nickel. <br /> FIELD SAMPLING <br /> 3. In addition to the above sampling and analysis, groundwater elevation, electrical <br /> conductivity, DO, pH, and water temperature will be measured and analyzed in the field <br /> during the semi-annual groundwater sampling activities each time a monitoring well is <br /> sampled. The sampling and analysis of field parameters is specified in Table 3. <br /> Table 3: Field Sampling Requirements <br /> Parameters Units TypeofSample <br /> Groundwater Elevation Feet, Mean Sea Level Measurement <br /> Water Temperature Degrees Celsius Grab <br /> Electrical Conductivity uhmos/cm Grab <br /> Dissolved Oxygen mg/L Down hole <br /> pH pH Units (to 0.1 units) Grab <br />