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e Eckert Cold Storage 757 Moffat Blvd, Manteca CA 11/23/98 Receptor Survey Page: 4 log for Pump 419 is attached in Appendix B. Static well level at Well #19 is shown to be 26.5 feet below the surface in August, 1997. Well #7 is not normally in operation and is considered a "stand-by" source. There is solid casing down to 120 and 130 feet below the ' surface in Well 47 and#19 respectively. The third well near the subject site is a well located approximately 500 feet easterly of the ' subject site on Trinity Street. This well was drilled for Pacific Gas & Electric as a cathodic protection well. Three irrigation lines are shown running in a northwest direction belong to the South San Joaquin Irrigation District (SSJID). These lines are typically aligned along the "high ridges" of the local geography. These "high ridges" allow the gravity flow of water onto the irrigated fields. Due to their relative height in relationship to the groundwater, these facilities would not be groundwater receptors. IAll of this site is covered with a "hard surface"; that is, roof, concrete, or asphalt surfaces. Surface runoff is directed to catch basins on site and transported by pipeline to Moffat Blvd. to the City of Manteca storm drain system. This system directs its flow into the French Camp Slough approximately 3-112 miles to the west of the subject property. Since all of the subject site is covered, it is unlikely that any groundwater would be affected by storm waters at the site. There is a possibility that pipeline infiltration would allow some groundwater into the pipeline system_ The closest pipeline collector is approximately 1,600 feet to the northwest from the identified contamination plume. Sanitary facilities at the subject property have improvements and pipelines which discharge into the City of Manteca system. All of this water is treated by the City of Manteca at their waste water treatment facility located approximately 2 miles west of the subject property. Groundwater will not normally enter this system. There is a possibility that pipeline I infiltration would allow some groundwater into the pipeline system. The closest pipeline collector is approximately 1,600 feet to the northwest from the identified contamination plume. 4.0 Mass Balance ' Using the concentrations of constituents in the soils when the original soil vapor and monitoring wells were installed in 1993, the total mass of the products has been estimated to ' be less than 75 gallons. The calculations are shown in Appendix C. • I I