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GeofoguafTedmws Inc • Page 3
<br /> J M Equipment Co
<br /> Monitoring Well Installation Work Plan
<br /> Appendix A
<br /> • Project No 507 2
<br /> January 13,1997
<br /> 1
<br />' surface of the ground water In the event that floating product is present, that well would not be sampled
<br /> unless specifically requested
<br /> The pump/batter is inserted into the well, lowered to a depth of 6 to 8 inches above the bottom and activated
<br />' Water flow is monitored visually for cloudiness and measured for flow rate,temperature, conductivity, and pH
<br /> At least three well volumes are purged from the well prior to sampling until pH, conductivity, and temperature
<br /> had stabilized to ensure sampling from representative formation water
<br />' After stabilization of water parameters, the well is allowed to recharge Prior to sampling the well, a bailer
<br /> blank is collected by pouring water provided by the laboratory into the bailer and emptying it into a sample
<br /> vial Sampling is accomplished by using a stainless steel bailer attached to a coated, stainless steel cable The
<br /> bailer is slowly lowered into the well and carefully allowed to fill with water After filling, the bailer is
<br /> carefully raised from the well taking precaution not to agitate the contained water An emptying device was
<br />' coupled to the bailer and the water was slowly transferred into the sample container (40 ml VOA vials) The
<br /> sample vials provided by the laboratory contain 4 to 5 drops of hydrochloric acid to retard possible biological
<br /> degradation The vial is capped, inverted, and tapped to check for air bubbles
<br />' After assuring that bubbles are not present, the vial is labeled and inserted into a closed-cell foam holder and
<br /> placed in an ice chest, cooled to 4° Celsius, for transport to the laboratory To monitor possible cross
<br /> contamination from any source, a trip blank prepared from water provided by the lab, is carried throughout the
<br />' sampling,storage, and shipping process
<br /> A chain of custody document is filled out which listed all samples collected, their date of collection, transfers of
<br /> custody, and laboratory analyses requested This document is used to track the samples and to ensure their
<br /> integrity
<br /> Ground water physical parameters including temperature, conductivity (EC), and pH are measured and
<br /> recorded in the field and are provided in report as field logs
<br /> 1 The ground water samples may be analyzed by Sherwood Laboratories of Hilmar, California and tested for
<br /> benzene, toluene, ethylbenzene, and total xylenes(BTEX) by EPA method 602, Total Petroleum Hydrocarbons
<br /> as Gasoline (TPH-Gas) by EPA method 8015(m), and total petroleum hydrocarbons as diesel (TPH-Diesel) by
<br /> EPA method 3510/8015m
<br />' The detection limits for these analyses are as follows benzene, toluene, ethylbenzene, total xylenes 0 3 ug/l,
<br /> and TPH-Diesel 50 µg/l
<br />'
<br /> 28 Soil Boring Installation
<br /> The soil borings will be drilled using a continuous flight hollow stem auger to a total depth to be determined
<br /> but not to intercept the ground water Soil cuttings will either be containerized in DOT approved 55 gallon
<br /> drums, labeled or lam on and covered by plastic sheeting,and stored on site until their proper disposition can be
<br /> arranged Soil samples will be collected for geological and analytical evaluation at five foot intervals Sail
<br /> samples will be collected in 6 0 inch brass Imers using a 2 0 inch modified California split spoon sampler All
<br /> soil samples will be sealed with aluminum foil, capped, labeled and placed in a cooler at 4'Celsius for transport
<br /> to the laboratory following Chain of Custody protocol
<br /> Because every soil sample collected will not be submitted for laboratory analysts, a screening process will be
<br /> used to gather additional mformation through field observation noting sediment type, especially grain size and
<br />' clay content, moisture content, visible evidence of contamination, i e, color change due to reduction of iron or
<br /> discoloration from hydrocarbons and other pollutants, and the readings above background on a organic vapor
<br /> meter (OVM) The OVM is a field portable photo ionization detector that uses a 10 0 eV lamp to detect
<br /> compounds with ionization potential below 10 0 eV (hydrocarbon range)
<br />' The soil bonngs will be closed as follows after the last soil sample has been collected the augers will be lifted 3
<br /> . feet and 50 pounds of bentonite will be poured through the hollow stem of the augers and hydrated with clean
<br /> tap water A tremie pipe of sufficient length to reach the total depth of the boring will be installed through the
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