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Frank C. Alegre Trucking, Inc. <br /> Lodi, California <br /> January 25, 1991 ) <br /> 4. 1 . Generally, the lithology can be described as brown <br /> silty clay and sand. Geologically, soil is a technical term <br /> describing the earth materials <br /> that <br /> has- been modified or <br /> altered by normal soil-forming processes of physical, <br /> chemical and biological agents. The snil horizon extends <br /> from the surface to the depth of unaltered parent materials. <br /> It should be noted that in the hazardous materials <br /> remediation trade, "soil" is commonly used as a nontechnical <br /> term describing all earth material (both soil and <br /> sediments) . By conventinr of the trade„ this report shall <br /> use soil as the non-tec:ani.oal term to .include all earth <br /> material, soil and sediment, unless specified otherwise. <br /> 4. 2.5. Soil Sample Analyses <br /> A total of 33 soil samples were retrieved from the I <br /> three borings . Field analysis indicat '` <br /> Y ed a no detection (ND) <br /> of contamination of all samples. As a 'result of the field <br /> ND, only 3 soil samples, one sample taken from each boring <br /> immediately above the water table, were'. submitted for <br /> analysis. The results of Qhemieal analyses of the borings <br /> are presented in Attachment 4.2. The chain of custody is <br /> included as Attachment 4.3. The following is a table <br /> summarizing the analytical data. <br /> CHEMICAL ANALYSES OF SOILiSAMPLES <br /> (reporting units: ugjkg) <br /> SAMP..E TFH TPH <br /> BORINGE <br /> D FTH (GAS) BENZ TOL E BENZ XYL (DIESEL) <br /> AM-1 45 ND ND ND ND ND ND <br /> AM-2 40 ND ND ND ND ND ND <br /> AM-3 40 ND ND ND ND ND ND <br /> (for complete analytical report see Attachment 4.2) E <br /> i <br /> 4.2.6. Well Installation <br /> Ground water was encountered at a depth of t45' . <br /> The borings were augered to a total depth of 55' . The , <br /> contractor installed 4-inch schedule 40IPVC casing in each <br /> well with 10 feet of milled No. 20 slot''°° size from 55' to <br /> 45' , gravel packed with 10X20 Monterey sand and capped with <br /> a bentonite and grout. Well installati'an is diagrammed on <br /> the soil-sample description logs. <br /> 4. 2. 7 . Water Samnling <br /> Water samlling was conducted by GeoAnalytical <br /> Laboratories. Two rounds of well sampling occurred. The <br /> first round was conducted on November 31,0, 1990 and the <br /> second round of sampling was on .January,';; 2, 1991 . The <br /> following is a table summarizing the analytical data. <br /> GeoPlus Consulting Services <br /> Page - 9 <br />