Laserfiche WebLink
04 March 1996 <br /> AGE-NC Project No 95-0144 <br /> Page 2 of 18 <br /> ' 23 SITE ASSESSMENT <br /> Between 1990 and 1994, five ground water monitoring wells and two soil borings were installed at <br /> the site by Resna Industries Hydrocarbon-impacted soil and ground water were encountered during <br /> ` the initial investigation 'Results of the Resna investigation have been summarized in numerous reports <br /> submitted;between 1990 and 1994, and are not recounted herein <br /> 1 a , <br /> In 1995, AGE completed assessment of hydrocarbon-impacted soil by advancing 17 soil probings, <br /> ' four probings were advanced near each former tank location for Tank Nos 1, 2'and 8, and five <br /> pi obings near the former location of Tank No 3 Soil samples were collected from 13 probings, <br /> ground water samples were collected from five probings Results of the subsurface investigation were ' <br /> ' summarized in the Quat terly Report -June 1995 prepared by AGE <br /> c ` <br /> ' <br /> 30 SPARGING'WELL INSTALLATION <br /> i <br /> 3 1 DRILLING AND SAMPLING <br /> Two pilot probings, IAS-1 and IAS-2, were advanced to 35 feet below surface grade (bsg) and were <br /> completed as in-situ air sparging wells on 24 January 1996 The location of these wells is illustrated <br /> ' in Figure 2 <br /> Both probings were advanced using a van-mounted Geoprobe 5400 soil probing machine equipped <br /> with 1 125-inch diameter rods The Geoprobe and one-man crew were supplied by EnviroProbe of <br /> Anaheim, California <br /> Discrete soil samples were collected in each pilot probing at 5-foot intervals from 10 to 25 feet bsg <br /> using a two-foot long piston-type sampler loaded with four 1 125-inch diameter, pre-cleaned brass - <br /> ' sleeves Sampling equipment was washed in an Alconox solution and rinsed with water prior to each <br /> sampling run to avoid cross-contamination <br /> For each soil sample, both ends of the second brass sleeve were covered with aluminum sheets, <br /> capped and sealed with tape The samples were labeled, stored on ice and transported under chain-of- <br /> custody to McCampbell Analytical, Inc (MAI) in Pacheco, California The 15, 20 and 25-foot <br /> ' samples from each probing were analyzed for total petroleum hydrocarbons as gasoline (TPH-g) and <br /> aromatic volatile orgarucs (benzene, toluene,,ethylbenzene and xylenes BTE&,X) in accordance with <br /> EPA methods 80151n and 8020, respectively <br /> 3, <br /> r '' <br /> lie <br /> , n <br /> i <br /> t <br /> 4 <br />