Laserfiche WebLink
1 <br /> Ethylbenzene and xylene (less than 0 015 mg/kg) in Borehole (BH) No C-3 and <br /> less than 0 065 mg/kg in BH No C-5R) and contamination with heavier fractions <br /> (purgeable C6-C12) were found in soil between 25 and 40 FT bgs Additionally, in <br /> BH Nos C-2, C-4/6, and C-5/7 extractable petroleum hydrocarbons ranging <br /> upwards to 15,500 mg/kg at 25 FT bgs were found <br /> t Groundwater was sampled when encountered in the boreholes MW No 1 was <br /> sampled on December 20, 2000 and March 30, 2001 A detectable level of <br /> BTEX of 0 500 ug/L was found in BH No C-4/6 Extractable_hydrocarbons were <br /> identified in groundwater samples from BH Nos C-1, C-2,C.3, C-4C-5 and MW-No 1_ <br /> Ground water was sampled from the single monitoring well in December 2000, <br /> April 2001, January 2002, and April 2002 <br />' Recent Activity <br /> Following resumption of monitoring in 2002, it became apparent that additional <br /> characterization of contamination both on and off site would be required After <br /> conditional approval by your office (EHD), six borings of which five were <br /> converted to cased monitoring wells were constructed by Woodward Drilling <br /> Company during June 6 and 7, 2002 Soil was sampled and classified by Stellar <br /> Environmental Solutions, Inc geologist Fred Hayden RG and Dan Barber PE <br /> Del-Tech Geotechnical Support Services developed the monitoring wells and <br /> continues to collect samples from MW Nos 1-6 for delivery to Sequoia Laboratory <br /> for analysis <br /> Well Top of Casing (TOC) elevations were established to 0 01 FT accuracy and <br /> related to the datum of the surrounding Victor Fine Foods ground water <br /> monitoring program by Daniel K Barber P E <br />' General Findings to Date <br />' Soil source areas with remaining diesel contamination have been identified One <br /> of the contamination zones extends into the adjacent eastern parcel from the <br /> original UST excavation area Significant but economically feasible to remove <br />' contamination exists between MW Nos 1 and 2 near the site's eastern property <br /> line fence Alternative methods of soil remediation are being weighed and will be <br /> proposed at a later date in a separate document <br />' The site's groundwater flow, based on December 17, 2005 Monitoring Well <br /> information is northeastward, at a gradient averaging 0 002 FT/FT declining at <br />' a current bearing of N 45 d'9 E Please reference ATTACHMENT 5, <br /> GROUNDWATER GRADIENT AND BEARING CALCUATIONS Diesel range <br /> hydrocarbons varied between <0 05 and 0 79 mg/Itr in the monitoring wells <br />' Previously MW No 3 was suspect as the lid had been removed and the casing <br /> plug was not in place It may be noted that while the previous quarterly readings <br /> of MW No 3 were as low as 0 19 mg/Itr in September 2003, 0 39 mg/Itr in <br /> 1 <br />