SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

Ms. Jill Jefferson ! - 2 - • 12 June 2001 investigation, additional `step-out' CPT borings and sampling may be conducted in the `Phase H Characterization' area." Phase R as depicted on Figure 2 does not display a step out protocol from the borings shown in Phase I, but is an area separate from the Phase I area. 2. The WP proposes to advance 14 cone penetration testing (CPT) borings to a depth of about 50 feet below ground surface (bgs). Of the 14 CPT borings proposed, six are within the known groundwater contaminant plume and the other eight are west of the plume. KMEP proposed no CPT borings in the eastern portion of the contaminant plume, nor east of the site boundary at the neighboring private residence on Cook Road. KMEP shall place two additional CPT borings along the fence line forming the eastern site boundary. KMEP must also arrange for characterization on the neighboring property, which can be done as part of Phase H work. 3. Deep groundwater monitoring wells are between 42 and 63 feet deep, so a CPT boring estimated at 50 feet bgs appears to be an appropriate depth. However, KMEP must increase the depth of the CPT boring if the ultra violet induced fluorescent (UVIF)probe continues to detect the presence of petroleum hydrocarbons. 4. The WP proposes to collect groundwater and soil samples and conduct laboratory analyses including TPH in the gasoline and diesel ranges,benzene, toluene, ethylbenzene and xylene (BTEX), and the fuel oxygenates MTBE, TBA, di-isopropyl ether(DIPE), ethyl tertiary butyl ether(ETBE), and tertiary amyl methyl ether(TAME). KMEP continues to have problems with the groundwater extraction and treatment system, so groundwater analyses should include all the parameters necessary to modify and optimize the treatment system. At a minimum, KMEP shall also analyze groundwater samples for turbidity, barium, iron, sulfate, specific conductivity, pH and temperature, and report the entire suite of Method 8260B analytes. _ 5. The GMR states that more than one-half foot of separate phase petroleum is present in monitoring well N-16, showing that source contamination from a 1986 spill is still present. N-16 is a shallow monitoring well with a total depth of 15 feet bgs and a 10-foot screen length, but it is not within the Phase I characterization area. KMEP must immediately initiate separate phase product removal from this well. KMEP must also arrange for characterization of this portion of the separate and dissolved phase contaminant plume, which can be done as part of Phase II work. 6. The GMR states that the soil vapor extraction and treatment (SVET) system "operated intermittently during the first quarter of 2001." The GMR also includes laboratory analytical results for influent vapor samples, but does not give details about this remedial measure. Revised Monitoring and Reporting Program (MRP) No. 94-806, which was issued on 21 September 1999, requires that the quarterly monitoring reports contain a status of ongoing remediation including system operating time and the mass of the