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Project 113-13 <br /> December 27,1995 <br /> Page 3 <br /> Each morutoring well was purged using a submersible electric pump prior to <br /> sampling. Approximately 8 gallons were removed from each well, which equaled at <br /> least four well volumes per well. All purge water was placed in a sealed metal 55- <br /> gallon drum (DOT 17H). After each well was purged, a sample was taken using a <br /> teflon bailer. The water from each well was placed in two 40-milliliter vials filled so <br /> that there was no air (head space) remaining in them. Samples were labeled and <br /> placed on ice in a cooler for transport to a state certified hazardous materials testing <br /> laboratory, McCampbell Analytical of Pacheco, California. The pump and electronic <br /> water level meter were cleaned in one bucket with TSP (trisodium phosphate) and <br /> three separate buckets with tap water after being used for each well. The bailer was <br /> cleaned in the TSP solution, rinsed three times in tap water, and rinsed with de- <br /> ionized water between each use. All purge water and equipment wash water was <br /> placed in 55-gallon steel drums and remains on-site When the drums are full, <br /> disposal options will be determined and documented in future reports. A copy of <br /> the Water Sample Data Forms are attached to this report. <br /> The samples were analyzed for TPH-gasoline and BTEX using EPA Methods 5030, <br /> modified 8015, and 8020 or 602 A copy of the laboratory reports and Chain of <br /> Custody form are attached to this report. <br /> Table 2 <br /> Cheapen #76 <br /> 890 North Main Street, Manteca, California <br /> Groundwater Sample Analysis Results* <br /> Samples Collected on April 22, 1994 <br /> Sample # TPH.E Benzene Toluene Ethxlbenzene _ Xylenes <br /> MW-1 ND < 50 ND<0.5 ND <0 5 ND <0.5 ND <0.5 <br /> MW-2 ND < 50 ND <0.5 ND <0.5 ND <0.5 ND <05 <br /> MW-3 ND < 50 ND <0.5 ND <0.5 ND <0.5 ND <0.5 <br /> MW-4 ND < 50 ND <0.5 ND <0.5 ND <0.5 ND <0.5 <br /> * Sample results are in µg/L or parts per billion <br /> The sample analyses show that total petroleum hydrocarbons as gasoline, benzene, <br /> toluene, ethylbenzene, and xylenes were not detected. <br /> IIL Future Directions <br /> This is the fourth consecutive quarter in which all wells were ND for TPH-g and <br /> BTEX. We recommend that monitoring be discontinued and the wells be <br /> abandoned. <br /> Parker Environmental Services 190 East 7th Street Pittsburg CA 94565-6116 <br /> Phone (510) 439-1024 Fax (510) 439-2566 <br />