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.z <br /> 2.0 Reid Procedures <br /> 2.7 Sail Vapor Collection System <br /> The system was designed by IT Corporation and reportedly in Called by representatives of <br /> Paradiso Construction Company in conjunction with tank excavation backfill efforts. The <br /> system was constructed of chemically inert,resistant flexible polyethylene piping placed <br /> below grade. Slotted vapor collection piping was laid in pea-gravel backfill in the former <br /> gasoline UST excavation, near the bottom of that backfill. Closed piping was laid in pea- <br /> gravel, at least 18 inches below grade, ir a trench running from the backfilled UST <br /> excavation to a riser and stub-out, for a possible treatment plant. The treatment area is to be <br /> located between a cinder block wall and a service,building,in the northwest comer of the site <br /> (Appendix A). <br /> %3 <br /> 2.2 Borehole Drilling <br /> -- prior to the commencement of drilling all underground utilities were located by Underground <br /> Services Alert. Soil borings were made ar_d wells were constructed using truck-mounted <br /> hollow stem auger drill rigs. Two California C-57 licensed drilling companies(Water <br /> Development Co. on 4/18!91 and Aqua Science Engineering on 7/29 and 7/30/91) were <br /> ,r subcontracted to perform the drilling services. The rf field geologist canducted tailgate <br /> _ s <br /> safety meetings,at the beginning of each day to insure that field activities were performed in <br /> accordance with the site Health and Safety Plan. <br /> t. ! Prior to drilling at each borehole, all angers were thoroughly steam cleaned. The split spoon <br /> ^ l F sampler and brass tube inserts were cleaned prior to each sampling event with a non- <br /> phosphate detergent scrubbing, foliwed by a water rinse and a final distilled water rinse <br /> F.: : <br /> Boreboles were logged and soil samples were obtained by using a modified California <br /> sampler under the direction of IT's field geologist. Soils were described using the visual <br /> method of the Unwed Soil Classification System (USCS). Boring logs are contained in <br /> Appendix B. "Sampling methods included grab samples for soil description and examination <br /> as well as samples in decontaminated brass tubes for laboratory analysis. <br /> Iriact soil samples and periodically collected drill cuttings were screened for the release of <br /> volatile organic contaminants with and organic vapor araizer equipped with a <br /> M Z/1 Q2I.91 JUSTK7014 MER <br /> r <br /> Tt <br />