Laserfiche WebLink
GRANITE CONSTRUCTION, FRENCH CAMP <br /> WKA No 2088 03 <br /> April 29, 1993 <br /> Page 4 <br /> Pumping equipment was cleaned prior to development and purging of each well with a solution of <br /> trisodium phosphate and distilled water to minimize the potential for cross contamination All <br /> water removed during development and purging operations was stored in sealed, labeled 55- <br /> gallon drums <br /> Subsequent to installation and completion, well locations and elevations were surveyed by a <br /> California-licensed surveyor to aid in the determination of the hydraulic gradient and flow <br /> direction <br /> FINDINGS <br />! Soil conditions and laboratory test results for each area investigated are discussed below Table i <br /> contains a summary of laboratory test results, boring and well logs containing complete <br /> descriptions of the materials and conditions encountered in the field are shown on Plates 4 <br /> through 24 Complete laboratory results and chain-of-custody documentation are appended <br /> Waste Oil Tank <br /> Two soil borings (B1 and B2) were constructed at approximate 30° angles from vertical beneath <br /> the former 2,000-gallon waste oil tank located adjacent to the easterly side of the shop building <br /> (Plate 2) The borings were constructed to depths ranging from 18 5 to 23 feet below site grade <br /> The soils in this area consisted primarily of sandy silts interbedded with silty clays and coarse <br /> sand No visual or olfactory evidence of petroleum hydrocarbon contamination was encountered <br /> during the drilling of the two angle borings <br /> ILaboratoryanalysis of samples BI-51, BI-61 and B2-4I revealed no detectable concentrations of <br /> TPH or BTEX Additionally, soluble waste oil metals analysis using the Waste Extraction Test <br /> (WET) method revealed only trace concentrations of the analyzed metals The highest <br /> concentrations were in sample B1-51, where cadmium, chromium, lead, zinc, and nickel were <br /> reported at 0 0084 mg/e, 0 0098 mg/P, 0 044 mg/Q, 0 73 mg/f, and 0 17 mg/P, respectively, <br /> r <br /> DD <br /> WALLACE•KUHL <br /> Recycled paper &ASSOCIATES INC <br />