WORK PLANS - Laserfiche WebLink

Home Browse Search

DEPTH TO GROUNDWATER: Referring to the spring 1993 water table map issued by the San Joaquin Flood Control District, PLATE IV, groundwater was recorded at between 60' to 70' below ground level at this location. The regional gradient is indicated to be to the east-northeast; however, this may change locally. Based on published data, the highest water levels measured in the last 10 years at this site were approximately 35' below ground level in the spring and fall of 1986. L LOCATION OF NEARBY WELLS: 'r The wells that the Flood Control District uses for water level measurements are shown on the enclosed PLATE V, which indicates that there are no control wells in the immediate vicinity of the site. The nearest wells are approximately one mile away. The county files have not been researched in order to locate any additional commercial, domestic, or groundwater monitoring wells; however, according to the application for UST closure permit,'there are no water wells on this parcel or adjacent properties. PRIOR USE OF REMOVED TANKS: The year of installation for the two (2) 5,000 gallon tanks is unknown. The UST's stored diesel fuel that was being used to run trucks and other equipment operated by Concrete, +. Inc. in conducting their ready mix concrete business. SUMMARY OF PRIOR WORK: w On January 12, 1994, Concrete, Inc. filed an application for the removal of two (2) 5,000 gallon underground storage tanks from the site. Jim Thorpe Oil, Inc, was hired as `+ contractor to conduct the work XHiBIT A). On March 1, 1994, Thorpe removed the tanks from the site and took four (4) soil samples at a depth of 14 feet from the bottom of the tank excavation. Sample TKIS was from underneath the south end and TKIN was from underneath the north end of tank #1, the ,r easterly located tank. Sample TK2S and TK2N were from under the south and north ends of tank #2, the westerly tank. Soil samples P1@5' and P2@3' were taken in the piping trench that held the product line connecting the tanks to the dispenser which was located i- 40 feet south of the removed tanks. Four soil samples, which were composited in the laboratory for analyses, were obtained from the soil pile before it was returned to the excavation. The soil samples were analyzed by Geo Analytical Laboratories, Inc. for TEPH (Method 3550 LUFT) and BETX (EPA Method 8020). All the samples were reported as non �, 3