FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

Site Background Information: Cancun Restaurant Page 4 of 4 10 soil samples at concentrations ranging between 43 ppmv(50 feet bsg)and 1,535 ppmv (35 feet bsg). In boring B5, southwest of the former UST area, brown gravelly to silty clay was encountered between 5 feet and 10 feet bsg; greyish brown silty clay was encountered between 10 feet and 15 feet bsg; greyish brown sandy silt was encountered between 15 feet and 17 feet bsg;greyish-brown silty clay was encountered between 17 feet and 19 feet bsg; grey silt was encountered between 19 feet and 27 feet bsg; brown sandy silt was encountered between 27 feet and 29 feet bsg; brown to greyish brown silts were encountered between 29 feet and 44 feet bsg; grey silty clays were encountered between 44 feet and 53 feet bsg; grey silt was encountered between 53 feet and 57 feet bsg; and there was no recovery of the sample at 60 feet bsg, however remnants of a medium grain, poorly graded sand remained on the sampler. HC odor was observed in 1 of the 14 samples collected from boring B5 at a depth of 35 feet bsg; organic vapor was detected in this sample utilizing an OVA at a concentration of 26.7 ppmv. MONITORING WELL INSTALLATION, DEVELOPMENT AND ANALYTICAL RESULTS OF SAMPLES Between 29-30 July and 06 August 2010 A total of five ground water monitoring wells (MW-1A, MW-1B, MW-2B, MW-313 and MW-4B)were installed. The screen was installed from approximately 55 feet to 60 feet bsg (MW-1 B, MW-26, MW-3B and MW-413) and 20 feet to 40 feet bsg (MW-1A)with blank casing extended to the surface. The filter pack(No. 2/12 Lonestar sand)was installed from approximately 53 feet to 60 feet bsg (MW-1 B, MW- 213, MW-313 and MW-413) and 18 feet to 40 feet bsg (MW-1 A). On 14 August 2010, the five new monitoring wells were developed and On 08 October 2010, quarterly ground water monitoring event was conducted utilizing site wells MWAA through MW-4B; all wells were sampled. Total petroleum hydrocarbons quantified as gasoline (TPH-g) were detected in the ground water samples collected from the wells MWAA, MW-1B and MW-26 at a maximum concentration of 8,500 microgram per liter (Ng/1). TPH-d was detected in the ground water samples collected from the wells MWAA, MW-1 B and MW-2B at a maximum concentration of 13,000 pg/l. Additionally, TAME was detected in monitoring well MWAA at a concentration of 8.9 pg/I; benzene was detected in wells MWAA, MWAB, MW-213 and MW-36 at a maximum concentration of 410 pg/1; toluene was detected in wells MWAA, MWA B and MW-213 at a maximum concentration of 43 pg/1; ethylbenzene was detected in wells MWAA and MW-1B at a maximum concentration of 1,700 pg/l; and xylene was detected in wells MW-1 A, MWAB, MW-213 and MW-313 at a maximum concentration of 971 pg/l. Advanced GeoEnvironmental,Inc.