ARCHIVED REPORTS_XR0004392 - Laserfiche WebLink

Home Browse Search

�y Project 113-13 July 31, 1995 Page 3 Shallow groundwater measurements indicate the water levels were approximately 4 foot lower than measurements taken in April 1995 after rising about 4 feet since last summer The groundwater flow direction was S57W, with a gradient of 0 008 (8 feet / 1,000 feet), as shown in Figure 2, the Groundwater Elevation Map Groundwater elevations over the last year are shown in Chart 1 Chart 1 Groundwater Elevations, MSL Cheaper' #76 14 MW-1 12 MW-2 10 MW-3 8 ® MW-4 6 4 2 0 July 94 January 95 April 95 July 95 Each morutoring well was purged using a submersible electric pump prior to sampling About 12 gallons were removed from each well, at least five well volumes per well After each well was purged, a sample was taken using the pump The water from each well was placed in two 40-milliliter vials filled so that there was no air (head space) remaining in them. Samples were labeled and placed on ice in a cooler for transport to a state certified hazardous materials testing laboratory, McCampbell Analytical of Pacheco, California The pump and electronic water level meter were cleaned in one bucket with TSP (trisodium phosphate) and two separate buckets with tap water after being used for each well. All purge water and equipment wash water was placed in 55-gallon steel drums and remains on-site Copies of the Water Sample Data Forms are attached to this report The samples were analyzed for TPH-gasoline and BTEX using EPA Methods 5030/8015 modified, and 602. The wells analyzed ND for the chemicals of interest (see Figure 3 - Hydrocarbon Concentration Map). A copy of the laboratory report and Chain of Custody form are attached to this report Parker Environmental Services 190 East 7th Street Pittsburg CA 94565-6116 Phone (510) 439-1024 Fax (510) 439-2566