ARCHIVED REPORTS_XR0007416 - Laserfiche WebLink

Home Browse Search

PROBLEM ASSESSMENT REPORT 6131 Pacific Ave , Stockton, CA lob Aegis Project No 90-020 Page 2 o Soil samples were recovered and classified according to the Unified Soil Classification System (USCS) , and a log of each soil boring was generated. o Soils recovered from the borings were screened for the presence of organic vapors with a photoionization detector (PID) . o Drill cuttings were placed on and covered by vzsquene. A total of four point samples were collected from the stockpiled soils in brass tubes. o Based on the results of classification and PID screening, one or more soil samples from each boring was placed under a chain of custody, secured in a sealed ice chest and submitted to a state- certified-laboratory for analysis. ' o Soil samples submitted for analysis were analyzed for benzene, toluene, ethyl benzene, xylenes (BTEX) and petroleum hydrocarbons volatile (PHV) . o Three of the soil borings were converted to 4-inch diameter PVC ground water monitoring wells. The remaining two soil borings were completed as vapor extraction wells. o On July 13 , 1990, the monitoring wells were developed by use of a wire line 5 ' stainless steel bailor and surge block. Approximately 45 gallons of water were removed from each monitoring well. The development water was contained in 55-gallon Department of Transportation (DOT) approved barrels. o On July 23 , 1990 , water level measurements and ground water samples were collected from the existing ground water monitoring wells. Ground water samples were submitted to a State of California certified laboratory for analysis. 1 o Ground water samples submitted for analysis were analyzed for benzene, toluene, ethyl benzene, xylenes (BTEX) , petroleum hydrocarbons volatile (PHV) , total and fecal coliform. o On August 1, 1990, the well head elevations were surveyed and A 'f-renced to a local bench marl- by a Cailfornla Licensed Surveyor. O During the week of August 15, 1990, the horizontal vapor extraction piping system and two vapor extraction wells were plumbed to the northeast corner of the site via subsurface 4" diameter PVC piping.