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Project 113-13 <br /> February 7,1995 <br /> Page 3 <br /> Groundwater elevations over the last year are shown in Chart 1. The groundwater <br /> at the site has reached its highest level in two years <br /> 115 <br /> 11 ® MW-1 <br /> NVh <br /> 105 wt MW-2 <br /> 10 � ` <br /> 4. ® MW-3 <br /> 95 <br /> x 0 MW-4 <br /> 9 vz, <br /> 85 <br /> Apr 94 July 94 Jan 95 <br /> Chart 1. Groundwater Elevation Measurements. <br /> Each monitoring well was purged using a submersible electric pump prior to <br /> sampling At least 12 gallons were removed from each well, at least six well <br /> volumes per well. After each well was purged, a sample was taken using a teflon <br /> bailer. The water from each well was placed in two 40-milliliter vials filled so that <br /> there was no air (head space) remaining in them. Samples were labeled and placed <br /> on ice in a cooler for transport to a state certified hazardous materials testing <br /> laboratory, McCampbell Analytical of Pacheco, California. <br /> The pump and electronic water level meter were cleaned in one bucket with TSP <br /> (trisodium phosphate) and two separate buckets with tap water after being used for <br /> each well The bailer was cleaned in the TSP solution, rinsed two tunes in tap water, <br /> and rinsed with distilled water between each use. All purge water and equipment <br /> wash water was placed in 55-gallon steel drums and remains on-site Copies of the <br /> Water Sample Data Forms are attached to this report. <br /> The samples were analyzed for TPH-gasoline and BTEX using EPA Methods <br /> 5030/8015 modified, and 602 A copy of the laboratory report and Chain of Custody <br /> form are attached to this report. <br /> Parker Environmental Services 190 East 7th Street Pittsburg CA 94565-6116 <br /> Phone (510) 439-1024 Fax (510) 439-2566 <br />