Laserfiche WebLink
24 November 2008 <br /> AGE-NC Project No. 98-0533 <br /> Page 2 of 3 <br /> for landscaping); and <br /> • Installation of dedicated tempo vapor points at proposed soil-vapor boring locations <br /> (Figure 3). r <br /> AGE will advance sixl borings for collection of soil samples near previous cont ant o <br /> detections. Two soil bo ngs will be advanced to five feet below surface grade(bsg)and sam led at 1, i <br /> 2 feet and 5 feet bsg. Four soil borings will be advanced to 20 feet bsg and sampled at five foot O ' <br /> intervals, beginning at 5 feet bsg. Proposed soil boring locations are illustrated on Figure 3. Soil_ o <br /> boring advancement and sampling procedures are detailed in the AGE-prepared Soil Vapor Survey <br /> Work Plan. <br /> As directed by EHD soil samples will be analyzed by a State of California Department of Public <br /> Health(CDPH)-certified laboratory for the following constituents: <br /> • Total petroleum hydrocarbons quantified as aviation fuel(TPH-ag)in accordance with EPA <br /> Method 8015M; and <br /> • Benzene, toluene, ethylbenzene and xylenes (BTEX) and methyl tertiary-butyl ether <br /> (MTBE), in accordance EPA Method 8260B. <br /> Proposed temporary soil vapor points will be advanced to five feet bsg and single-completed <br /> utilizing'/4-inch diameter schedule 40 polyvinylchloride(PVC)0.010-inch slotted screen and blank <br /> casing.Each vapor point will be completed with a 0.5-foot length of screen attached to blank casing <br /> extending to near surface. <br /> After installation,a filter pack material consisting of pre-washed#2/12 sand will be added over the <br /> screen interval to approximately 0.5-feet above the screen interval. Remaining annular space will <br /> be sealed with Volclay bentonite from surface grade to approximately 4-feet bsg. Additionally, a <br /> PVC cap with '/4-inch diameter polyethylene tubing will be attached to the surface end of the t( � � <br /> temporary vapor point in order to collect vapor samples. Proposed temporary vapor point <br /> construction diagram is illustrated in Figure 4. <br /> After collection of soil vapor samples and reporting of analytical data,temporary vapor points will <br /> be removed from the soil-vapor borings,and borings will be destroyed by backfilling with portland <br /> cement from total depth to surface grade. <br /> As directed by EHD soil-vapor samples will be analyzed by a CDPH-certified laboratory for the <br /> following constituents: <br /> �' � Advanced GeoEnvironmental,Inc <br />