ARCHIVED REPORTS_XR0002030 - Laserfiche WebLink

Home Browse Search

L� DOCLOS Eh-VIRO,1s'MENTAL, INC. i Sampling Methods Proper sampling methods must be followed to assure that samples represent actual field conditions and that samples are labeled, preserved, and transported properly to rec= sample integrity This attacltmertt desenbes procedures to be followed by Doulos Environmeatal, Inc (Doutos), during collection to of samples of subsurface soil and groundwater Sampling procedures will be based on sampling guidance documents from the 4mer.can Society of Testing and matenals(ASTM), U S Environmental protection Agency (EPA), and California Deparnnent of Health Services (DHS) Actual sampling procedures to be employed will be based on field con6uons and may differ from those described here A EXPLORATION SORINGISOUL SAMPLING PROCEDURES Soil borings and soil sampling will be performed under the direction of a Dculos geologist Thesoli borings will be advanced using drtllmg techn ques appropriate for each protect, as specified ui the project work plan Soil samples will be collected at maurnum intervals of 5 feet Soil sarrTling will be done m accordance wi�ln ASTM 1584-84 Using this Procedure, three 1 06- to 2-izch-diameter, 6-inch-ling±, brass or staLiless steel rubes are plac;d in a Califorrua-type-split-barrel smiler, or a slide hammer with a single 6-inch by 2-inch brass or stainless tube by tapping the tube into the soil in the backhoe bucket with a mm haer Thesampler is drnen Into the soil by a 140-pound we gbi falling 30 taches or wtu a slide hammer on hand auger samp'es After an uutial set of 6 inches, Lie nmbtr of blows regired to drive The sampler an addiuonal 12 :aches is known as penetration resistance or the AN= valLe The AN= value is used as an errpu,c,al Treasure of the relative density of cokes on less soils acid the cons�sremy of cohesive soils When Collec•ir; a soil sample from a tank exca-alLon or line exca.at-cn, the soil sample will be collected by tapomg a bass stainless steel tribe into the sod ii;the backhoe buck:t [.ipon recovery of the splr-barrel sampler or slide hamster saBTter the brass or starruess s.ee: rubes corimining the soil will be rerroved One tribe will be sealed at the a-ds «ith plasr-c er_d caps The end caps will be secured io the ends or the tube to prevent loss of vfliac,:e CCMZLtLcnts The sar iple w,11 be labeled with an idenuficanan number, time date, localion5, and requesed lal,oratoD analysis The sample will then be placed in a plasric bag and stored at aoproxtma esy 4 degrees Celsius 8 m an ice ch..st fer transport to the laboratory Sample custody procedures outlined u Section E of this attac1L-=t will be followed This will be pertorrned for each sample collected. Soil in one of the brass or stainless steel rubes from the Split barrel sampler i;ill be ex*racred upon recovery, placed in a plastic bag and sealed for later screening for organic vapors using a photo ionizauon detector(PID) or a flarne iortization detector(FID) The remaining portion of the soil sample will be examined and a complete log of soil conditions will be reco-ded on a soil boring log using the Uaafied Soil Classification System The soil will be examined for grain size, color, and moisture content The split-barrel sampler or slide harruner sampler will be cleaned tc prevent contamination across sampling mtervals using procedures described in Section C Soil gene- stored in ated from the soil borings will be 55-gallon dnizns (unless etherwtse directed by agencies or the client) ,abeled with the corresponding boring number, date, and address of the facdjty DECONTANU ATION A_N'D DISPOSAL pROCEDUR.ES • All equipment that comes into Contact wita potentially contaminated soil, drilling fluid, a.r or water will be decontamuiated before each use Decontamtnauon will consist of steam clean- g, a high-pressure, hot- water rinse, or tmodium phosphate(TSP) wast; and freshwater rinse, as appropriate Drilling and sampling equipment will be decontaminated as follows