Laserfiche WebLink
r _ <br /> MAW <br /> - 9129 Continued field work; drilled borings #4-8, conducted geological investigation, <br /> collected soil and water samples, installed monitoring wells #1 & 2 In borings <br /> w #4 & 6; an underground tank discovered while drilling boring #7 <br /> 9130 Continued field work; drilled borings #9-13, conducted geological Investigation, <br /> collected soil and water samples <br /> 1 011 Continued field work; drilled borings #14-16, conducted geological <br /> investigation, collected soil and water samples, installed monitoring well #3 in <br /> boring #15 <br /> 10/2 Delivered soil and water samples to California Water Labs <br /> L' 1 015 Project update with Ben Curran and Rudy Dell'Osso <br /> { 10112 Surveyed tops of monitoring wells and.ground level for each boring, measured <br /> ground water level in each monitoring well <br /> 10120 Started writing property evaluation report <br /> 11/5 Received the analytical data from California Water Labs <br /> Quality Assurance Program <br /> The following measures where taken to Insure that a high quality study was performed <br /> and that cross contamination of laboratory samples did not occur during the project. <br /> i Equipment: Borings were drilled with a 7.25 inch (o.d.) hollow stem continuous flight <br /> l g auger, owned and operated by Osterberg and Stewart, Inc. A 2 inch (o.d.) split spoon <br /> soil sampler (modified California sampler) with brass sample tubes was used to <br /> collect soil samples. <br /> Boring Logs: Detailed logs were made of each boring. The information gathered includes, <br /> sample depths, horizons of detectable contamination, Unified Soil Classification, <br /> F sediment description, sediment moisture content and other geological information. <br /> f <br /> k Individual boring logs are given in Appendix A. <br /> Soil Sampling: Soil samples were collected at 3 foot intervals starting at three feet, or <br /> below the bottom of the excavation. These samples were used to characterize the <br /> sediment types and generalize the level of contamination. Only select samples were <br /> sent to the lab for analysis. These data are listed in Tables 1 and 2. After the <br /> samples had been collected, the samples tubes were immediately sealed with <br /> aluminum foil,capped, labeled and stored in an ice chest cooled with blue Ice. <br /> "- Water-Sampling;--One-ground-water-sample-was collected from-the-first-ground-water-- -- --- - -_ <br /> encountered In each boring. To Insure that the drilling procedure di.' not.introduce <br /> contamination Into the ground water, a well casing was installed and 5 gailons (about <br /> 12 well volumes) was removed before the sample was collected. After lhfj sample <br /> �..�' was collected,the casing was removed and thoroughly steam cleaned befrre being used <br /> in the next boring. <br /> 4 <br />