Laserfiche WebLink
DOHS certified laboratory for analysis. Chain-of-Custody records will be maintained for all <br /> samples. <br /> 2.3 Soil Sample Analysis <br /> All soil samples will be analyzed for total petroleum hydrocarbons (TPH) as diesel and <br /> benzene, toluene, ethyl benzene, and xylenes (BTEX) by EPA methods 8015 and 8020 <br /> respectively. The sample containing the greatest diesel concentration and/or the deepest <br /> sample per borehole will be additionally analyzed by the California Waste Extraction Test <br />' (WET) for TPH (Title 22, CCR, 66261.100, Appendix 11). One select soil sample only will <br /> be analyzed for total organic carbon by EPA method 415.1 One representative sample will be <br /> tested for grain size distribution by sieve analysis. <br /> A composite sample of any soil cuttings generated during drilling, will be collected and <br /> analyzed for reactivity, corrosivity and ignitability (Title 22) to facilitate disposal. <br />' Method detection limits will follow those defined in the Leaking Underground Fuel Tank <br /> (LUFT) Manual, March 1989, and the Regional Water Quality Control Boards (RWQCB): <br /> "Tri Regional Board Staff Recommendations for Preliminary Evaluation and Investigation of <br /> Underground Tank Sites," August 1990, where applicable. <br /> Upon arrival to the laboratory, the samples' condition will be checked and any <br /> nonconformaties will be noted. Copies of signed laboratory reports and sample condition <br /> forms will be presented in the subsequent Soils Investigation Report. <br /> 2.4 Well Construction <br /> Vadose zone observation wells will be installed in the two soil borings. The wells will be <br />' constructed using two inch schedule 40 PVC pipe and 0.02 inch slotted PVC well screen. <br /> The screen length in each well is anticipated to be 25 feet with a total well depth of 30 feet. <br /> The field geologist will determine the depth of each well based on field conditions and will <br /> rdetermine any special procedures required to manage unusual or anomalous conditions. <br /> Lonestar sand #3 will be used to fill the annular space surrounding the well screens, from the <br /> well base to one foot above the top of the screen. Each well will be sealed using a one foo_ t <br /> thickness of 318 inch bentonite pellets, followed by a portland cement slurry to within six <br /> MZ/05-10-94/UST/94-0062.nbr 2_3 <br />