Laserfiche WebLink
1 <br /> i ' Site Background Information Chapin Brothers Investements, Inc <br /> Page 2 of 12 <br /> extraction well (VW-1)near the center of the property <br /> Low concentrations of petroleum hydrocarbons were detected in soil samples from MW-3 MW-4 <br /> and VW-1 No hydrocarbons were detected in soil samples from MW-2 Eight additional soil <br /> borings were drilled in March 1994 Seven of the eight soil borings were drilled off-site, south and <br /> southwest of the site The data indicated that impacted soil extends approximately 180 to 200 feet <br /> off-site to the southwest, however, most of the off-site impacted soil contains very low <br /> ' concentrations of petroleum hydrocarbons <br /> ' FREE-PRODUCT IN GROUND WATER <br /> It is our understanding that prior to January 1995, groundwater samples from the site had been <br /> ' collected on three occasions During each sampling event, free hydrocarbon product was detected <br /> in MW-1,therefore,no samples were collected Free hydrocarbon product was encountered in MW-1 <br /> ' and MW-4 <br /> ' • AQUIFER TESTING AND ANALYSIS <br /> A pump test was performed at the site by SEACOR Groundwater was extracted from MW-1 and <br /> ' drawdown was measured in three surrounding wells The test duration was approximately 24 hours <br /> SEACOR concluded in the PAR that drawdown data collected during the pump test indicated that <br /> ' the pumping from MW-1 has little influence at the site Therefore, a pump and treat system of <br /> ground water remediation would likely be ineffective at the site Complete pump test data was <br /> included in the PAR <br /> 1 <br /> SOIL VAPOR EXTRACTION TEST <br /> ' On 10 June 1994 a soil vapor extraction test was conducted at the site A vacuum was applied to an <br /> extraction well (VW-1) and measurements of flow rate and vacuum were collected from three <br /> temporary observation wells(VW-2,VW-3 and VW-4) However,a vacuum could not be achieved <br /> on VW-1, so the internal combustion (IC) unit was connected to one of the observation wells It <br /> appears that VW-1 may have been placed too close to the western UST excavation, which was <br /> ' backfilled with pea gravel, and"short circuited"the attempt to draw a significant vacuum Despite <br /> the short circuiting of VW-1,the test concluded that vapor extraction would be a viable remediation <br /> ' alternative for impacted soil at the site The data collected during the pilot test indicated that <br /> sufficient flow and hydrocarbon recovery rates can be achieved at the site <br /> ' Advanced GeoEnvironmental,Inc <br />