ARCHIVED REPORTS_REMOVAL ACTION COMPLETION REPORT

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Draft Removal Action Completion Report Neighborhood C, Mountain House,CA Page 12 a filter/solid sorbent tube, Chromosorb 102. An OVS-2 tube: 13-mm quartz filter; XAD-2, 270 mg/140 mg was specified in the RAW. Each sampling pump was calibrated in the morning, prior to sampling, with a representative sampler in line. The sampling flow rate was checked at regular intervals to ensure a flow rate of 0.5-liter per minute was maintained. Sampling was discontinued if dieldrin removal operations were discontinued prior to completing an entire work day.This was done to avoid sample bias that would have resulted in raising the detection limit but also under-representing concentrations that actually occurred while operations were taking place. At the conclusion of daily activities, the sample containers were collected, labeled, and shipped under chain of custody procedures to EMSL Analytical,Inc. in Cinnaminson,New Jersey. 5.0 LABORATORY ANALYSES 5.1 CONFIRMATION SAMPLES Samples were picked up and transported to the laboratory by a laboratory courier or by Condor personnel, under chain of custody procedures, on the day of collection. Confirmation samples were analyzed for dieldrin at MAI, California Environmental Laboratory Accreditation Program number 1644. Laboratory analyses were requested on a 24-hour or same-day turnaround time basis. Confirmation samples were analyzed for dieldrin by EPA Method 8081A. The use of Method 8081A is a slight variance from the RAW which specified the use of Method 808113. In addition, the RAW specified analyses include OCPs but for expedience of analytical results and in consultation with DTSC, only the target analyte, dieldrin was requested to be reported. Laboratory control samples including method blanks and matrix spike analysis indicated that quality controls were within laboratory reported limits. 5.2 WASTE CHARACTERIZATION SAMPLES Samples were picked up and transported to the laboratory by a laboratory courier or by Condor personnel, under chain of custody procedures. Waste Characterization samples were analyzed for dieldrin at MAI. Waste characterization samples were composited by the laboratory at specified ratios (either 4:1 or 6:1) and analyzed for dieldrin by EPA Method 8081A. Laboratory control samples including method blanks and matrix spike analysis indicated that quality controls were within laboratory reported limits. 5.3 AIR SAMPLES Data Chem Laboratories, Inc. was specified in the RAW but has discontinued these analytical services since 2007 when the RAW was written. NMAM 5600M (modified to detect organochlorine pesticides) with a detection limit of 0.02 micrograms per cubic meter (µg/m3) dieldrin had been specified in the RAW. During project planning immediately prior to removal action implementation, Condor consulted replacement laboratories and was informed that NIOSH Method 5510M was the appropriate method for detecting organochlorine pesticides. At the end of each day, the three air samples and one daily field blank were labeled, sealed, and shipped under chain of custody procedures to EMSL Analytical, Inc. in Cinnaminson, New Jersey using FedEx overnight shipping, for analysis. Laboratory analyses were requested on a 24-hour turnaround time basis in accordance with the RAW. Samples were analyzed for organochlorine pesticides by NIOSH Method 5510M with a detection limit of 0.50 micrograms per cubic meter (µg/m3) dieldrin. Actual detection limits varied from as high as 1.0 µg/m3 to as low as 0.50 µg/m3due to the amount of time the during which the sample was collected, depending on the length of time that dieldrin removal operations were taking place each day. All air analysis results were forwarded to DTSC for review within four-hours of receipt in accordance with the RAW.