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r r. `] • 111EALTh k% KLEINFELDER 3 `.!. ff cl € . -w� JLC P M File No. 20-3775-01.G02 June 30, 1994 Mr. Michael K. Christensen Roberts and Schaefer 5225 Wiley Post Way, No. 300 Salt Lake City, Utah 84116 Subject: ADDITIONAL GEOTECHNICAL SERVICES PROPOSED TEICHERT AGGREGATES - VERNALIS PLANT SAN JOAQUIN COUNTY, CALIFORNIA 1. 11V RODUCTION This report presents the results of a test boring drilled and percolation testing performed for the subject project. The proposed plant will be located at the southeast comer of Bird and Blewett Roads in San Joaquin County, California. Reference is made to our report dated June 9, 1994 which included the results of a subsurface investigation performed -for the subject project. We understand that a storm drainage basin will be constructed at the northeast corner, and a septic system for the on-site facilities will be constructed near the north central portion of the site. The basin will likely be between approximately 5 and 10 feet deep. The purpose of our Loring and percolation testing has been to explore and evaluate the surface and subsurface conditions at the proposed basin and septic system locations and to provide recommendations for uw. in design by others. The scope of our services was outlined in our discussions with Mr. Rodney Smith and in our proposal dated June 16, 1994. H. HELD EXPLORATIONS The field explorations for this report were performed on June 27 and 28, 1994. One test boring was drilled to a depth of approximately 40 feet, and three percolation tests were performed at depths of approximately 10, 20, and 30 feet below existing ground surface at the proposed drainage basin location. Two approximate 3-foot deep percolation tests were performed at the proposed septic system location. The approximate locations at which the boring and percolation tests were performed are shown on Plate A-1 of this report. The boring and percolation test holes were drilled using a truck-mounted drill rig equipped with approximate 6-inch diameter, hollow-stem and continuous-flight augers. A continuous log of the materials encountered in the boring was maintained by a field engineer from our firm. Each percolation test hole was cased with slotted PVC pipe packed in relatively-clean sand. The percolation tests at the proposed basin location were performed on June 27, 1994. The r ri t 1994 Kleinfelder,Int. Page I of 4 KLEI ffri K 2825 East Myrtle Street,Stockton,CA 95205-4794 [2491 948-1345 i