Laserfiche WebLink
L`►1%TD 'C <br /> A Versar geologist will be on site to log each borehole as it progresses The soils <br /> encountered will be characterized according to the Urufied Soil Classification System (ASTM <br /> D-2487), and will Include notations of all other pertinent characteristics A geologist <br /> registered In the State of California will review the drill logs produced <br /> All down-hole equipment, Including bits, augers, and samplingmen will be <br /> thoroughly �uI p t' <br /> cleaned and decontaminated before and after dnllrng each borehole Pending <br /> disposal, decontamination water generated during this process will be stored In 55- ✓ <br /> gallon <br /> drums approved by the Department of Transportation (DOT) <br /> Soil samples will be analyzed in the field using standard field headspace analysis (as <br /> described In Appendix B) Up to a total of 10 soil samples from each boring will be � <br /> analyzed by a California-certified laboratory for TPH as het fuel by EPA Method 8015M and <br /> BTEX by EPA Method 8020 <br /> 3 13 Borehole Abandonment <br /> Following the completion of all sampling p g activities, each of the soil borings wllI be <br /> backfilled with Portland Type I-II cement containing up to five percent prehydrated bentonite <br /> The cement-grout mixture will be tremred <br /> _______Into the open borehole The tremre pipe will be <br /> placed two to seven feet above the bottom of the open borehole until undiluted grout flows <br /> from the borehole at the ground surface If the tremre pipe must be raised during grouting, It <br /> will remain submerged at least 20 feet below the surface of the grout Each of the borings <br /> will be marked with a traffic cone until the cement has set, and the surface replaced to Its <br />' original condition <br /> 3.2 Gmundwater Evaluation <br /> In order to evaluate the currentoundwater <br /> l�' duality at the site, Veisar proposes to <br /> purge and sample the three existing groundwater monitoring wells during the proposed site <br /> investigation activities The monitoring wells will be purged and sampled according to <br /> Vemar's groundwater purging and sampling procedures Included in Appendix B Following <br /> 8 <br />