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Project 113-13 October 12, 1993 Page 2 A fourth monitoring well was installed by Parker Environmental Services at the site on September 6, 1991 Soil samples analyzed from the boring were all non-detect for TPH-g and BTEX. Groundwater samples obtained on September 11, 1991 from all four monitoring wells were also non-detect for TPH-g and BTEX. Depth to groundwater was 28 to 29 feet below ground surface. An aquifer pump test was done by Parker Environmental Services at the site October 15-16, 1991, and it showed that all four monitoring wells are in the same aquifer. At this time no cleanup efforts have been implemented. IL Current Activities Groundwater samples were obtained on December 21, 1993. Prior to sampling, groundwater elevation measurements were obtained Results are presented in the table below. Table 1 Cheaper! #76 890 North Main Street, Manteca, California Groundwater Measurement Results* Measured on December 21, 1993 MW-1 MW-2 MW-3 MW-4 Well Elevation 33.12 33.22 3355 33.66 Depth to GW -2264 -2264 23.02 -23.22 GW Elevation 1048 10.58 1053 1044 * elevation above mean sea level, in feet Shallow groundwater measurements indicate the water table is approximately X feet higher than measurements taken in September, 1993 As shown on the attached groundwater flow direction drawing, the flow direction is toward the southeast, unchanged from the September, 1993, measurements Each monitoring well was purged using a teflon bailer prior to sampling. Approximately 6 to 8 gallons were removed from each well, which equaled at least three well volumes per well. All purge water was placed in a sealed metal 55-gallon drum (DOT 17H). After each well was purged, a sample was taken using a disposable PVC bailer. 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. Before the next well was purged and sampled, the pump was run in one bucket with non-phosphate detergent and two separate buckets with tap water. All purge water and equipment wash water was placed in 55-gallon steel drums and remains on-site. When the drums are full, disposal options will be determined and documented in future reports. A copy of the Water Sample Data Forms are attached to this report. Parker Environmental Services 190 East 7th Street Pittsburg CA 94565-6116 Phone (510) 439-1024 Fax (510) 439-2566