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PRE-TANK REPLACEMENT Site Assessment Results 880 VICTOR ROAD LODI, CA. Aegis Project No. 89-014 Page 11 high to low. Wells that penetrate the Mehrten Formation yield as high as 1000 gallons per minute (gpm) . Ground water occurs within the Laguna and Victor Formations under both unconfined and semi-confined conditions. Permeability in both formations varies greatly. Wells penetrating the Victor formation generally also penetrate the Laguna Formation. Yields as high as 1500 gpm have been reported from wells penetrating the Laguna Formation (DWR 1967) . 3 . 0 PROJECT RESULTS A total of fourteen soil borings were advanced according to the methods described in Appendix A at the locations shown on Figure 2 . Soil borings B-1 through B-4 were advanced to a depth of 21 . 0 feet below grade. Soil borings B-7 and B-9 through B-12 , were advanced to a depth of 16 . 0 feet below grade. Soil borings B-5, B-6, B-8 , B-13 and B-14 were advanced to a depth of 11. 0 feet below grade. Logs of the soil borings are included in Appendix B. A total of fourteen soil samples from the soil borings were submitted to a state-certified-laboratory for analyses. Copies of the analytical laboratory reports are included in Appendix C. Four representative soil samples were submitted to a geotechnical laboratory for soil mechanics testing. A copy of the geotechnical engineer' s recommendations is included in Appendix D. 3 . 1 Soil Types Soil types recovered from the borings consisted of interlayered sandy silt, silty sand, silt and clayey silt which was underlain by sand. The sandy silt contained fine to medium grained sand, minor clay, occasional pebbles and was brown and moist. The silty sand was fine to medium grained, partially cemented, light brown and dry. The silt was reddish brown and moist. The clayey silt was reddish brown and moist. The sand was fine to coarse grained, contained minor amounts of silt and was brown to white and dry. Ground water was not encountered in any of the soil borings. Figure 5 presents cross section A-A' . The location of the cross section is shown on Figure 2 . Subsurface conditions are inferred from the soil boring logs presented in Appendix B. As shown on the cross section, soil conditions beneath the site can be divided into two soil units. The upper soil unit consists of interlayered predominantly fine grained sediments of silty sand, silt, sandy silt and clayey silt. The lower soil unit consists of sand.