Laserfiche WebLink
NAVCOMST, 3 19 August 1992 <br /> unders 3nding that Shell has already agreed to investigate known petroleum <br /> contam_ ation off-site in the direction of the Navy Station. NCS should <br /> coordin. e their investigation efforts with Shell to avoid duplication. <br /> 3. Concentra 4ons of metals (i .e. lead up to 1, 100 ppm) , PCB's up to 72 ppm, oil <br /> and grease ip to 69,000 ppm, gasoline up to 30,000 ppm, and diesel up to 5,000 <br /> ppm have oe n identified in the storm drain, site 5D in this area. Further <br /> definition a d cleanup of this contamination should be proposed. <br /> Warehouse Area <br /> 1 . In 1988 monitor ig well 3 in this area had concentrations of TCE up to 5,200 <br /> ppb and PCE up t 8,600 ppb in the ground water. Although quarterly sampling of <br /> this well is nece sary, further source definition of this contamination is <br /> overdue. Additionz monitoring wells to assess the extent of contamination <br /> associated with th area should be located down gradient from suspected <br /> sources and well W <br /> Agricultural Area <br /> 1 . Ground water at Site 3 lithin the Agricultural Area, (formerly Fire Fighting <br /> Training Site) has been `ound to be contaminated with 120 ppb benzene, 5000 ppb <br /> cis-1,2 DCE and 70 ppb v nyl chloride. Although quarterly monitoring of wells <br /> W-1 and W-2 is necessary, additional monitoring wells to assess the extent of <br /> contamination associated w th this area should be located down gradient from <br /> suspected sources and well- W-1 and W-2. <br /> Specific Comments <br /> 1 . The comment section on field s mpling sheet no. 11 states that soil samples <br /> will be collected during well i stallation, however the soil sample table on <br /> that same sheet does not accoun, for these samples to be analyzed. What are the <br /> plans for these samples? <br /> 2. Field sampling sheet no. 14 shows �e installation of both a shallow and an <br /> intermediate depth monitoring well i the area of site IAS-13 however, the <br /> Ground-Water Sample Summary accounts for only one ground water sample for the <br /> first two quarters. Was one of these onitoring wells overlooked? <br /> 3. Field sampling sheet no. 19 proposes 3 ampler to be collected from 0- to 6 <br /> inch depths of the sludge drying beds a the Waste Water Treatment Plant. The <br /> sludge drying beds are described as 3 in. ,es deep covering an area <br /> approximately 50 feet by 600 feet (page 1 18) . This constitutes a volume of <br /> approximately 278 cubic yards of material . =or final characterization one <br /> discreet sample should be taken for approxi, 3tely every 20 cubic yards of <br /> material . The rationale behind this number i based on current guidelines for <br /> sampling intervals used in determining the ex ent of contaminants in-situ <br /> (sampling intervals of every five feet in bora gs) . Samples should contain only <br /> sludge and therefore be collected from the sure ce to a depth of only 3 inches. <br /> 4. Comments on Field Sampling Sheet No. 21 state th, - soil sample locations will <br /> be base on "filling a 5-gallon bucket half full w `h clean water and throwing <br /> water from door of building" . What is the rational for this? <br />