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i � . . � PROJCG"T NO: 4220 91-1427 DATE: September 11, 1g91 PAGE: 3 SOIL OIiSERVATIONS AND TESTING OBSERVATION METHODS AND RESULTS (con't ) During our site visits, we observed soils exposed at completion of excavation wit�in the plal�iiie�l building area addition. Within the eastern 10 to 12' of the building area, adjalcent to th� existing structure, excavation terminated upon previously placed compacted fill at relative�y shallow depths. Within the remainder of the building area, the elevation of the bottom of the excavation ranged from about 33' in the southwest, to 37' in the southeast, 49' in the northwest and 50' to S1' atong the north building line. Our observation of the excavation adjacent to the existing structu're indicated that the existing foundations range from 6' in the north, to 10' in the south,below finished floor elevation, therefore ranging in elevation from about 51' to 47'. The soils exposed at completion of excavation consisted of brown, mottled brown and grey sandy lean clay, lean clay, and clayey sand. Some lenses and laminations of sand with silt and silty sand were encountered in the southern lower lying portions of the excavation. Soils in this area were also water-bearing. The soils, in the condition observed, were judged to be suit�ble for support of fill required to re-established planned building grade. COMPACTION TESTING During the period of August 20-29, 1991, 43 compaction tests were performed on �11 placed to re- establish planned grade. As specified, the tests were evaluated according to the 11�odified Proctor Method (ASTM: D1557). The results of the individual tests are attached. These tests indicate tt�e specified minimum compaction level of 95%was attained or exceeded at the location and elevation of each of these tests. REMARKS We are attaching an information sheet concerning what we consider to be sound engineerifig practices for the construction of a fill sequence. ,. ., TWIN CITY TESTING CORPORATION . ��i , :_.1�-� �} Gary A?�n "Iton"ald A�;%i, . Shaffer, P.E. Field Engineer Principal Geotechnical Engineer GAL/RAS/sew AS�MU7UAL PROTECTION TO CLIENTS.THE PUBI.IC AND OURSELVES,A�I,TWIN CITY TES7ING CORPORATIQN RFPORTS ARE SUBMITTED AS THE CONFIDENTIAL PROPERTV OF Cl1ENTS, A1JI1 AUI1IOIi1ZAfIOH F(?R f U[i1.ICAiION OF StA�EMENTS,CONCIUSIONS OR EXTRACiIONS FIapM OR REGARDING OUR REPORiS IS RESERVEO PENDINGl OVR PRIQR WqiTTEN APPfiOVAI.