COMPLIANCE INFO 1985 - 2016 - Laserfiche WebLink

Home Browse Search

J. H . •EINFELDER & ASSOC?NTES GEOTECHNICAL CONSULTANTS • MATERIALS TESTING JJj w � " a I LAND & WATER RESOURCES 2825 EAST MYRTLE STREET SEP 5 1985 STOCKTON, CA 95.05-4794 2091948-1345 File No. S-2594-4NVIROMENTAL HEALTH June 7, 1985 FERMIT/SERVICES Musco Olive Products, Inc. 17950 Via Nicolo Tracy, CA 95376 Attention: Mr. Ben Hall Subject: MONITORING WELL BORINGS PROPOSED EVAPORATION/STORAGE PONDS MUCSO OLIVE FACILITY/TRACY, CA Gentlemen: As requested, our firm attempted to install three monitoring wells surrounding two proposed evaporation storage ponds at the Musco Olive facility in Tracy, California. A site plan showing the approximate locations of the pro- posed wells is presented on Plate L Soil borings were drilled on May 1, 13, and 14, 1985, using a truck mounted drill rig equipped with 6-inch diameter continuous flight auger. Occasional soil samples were obtained by pounding a split spoon sampler into the soils using 140-pound hammer falling approximately 18 inches. Continuous logs of the soils encountered in each boring were maintained in the field and are presented on the Logs of Borings, Plates Ill, IV, and V. In general, the soil conditions encountered in the three wells drilled consisted of approximately 2 to 4 feet of dark-brown sandy silty clay at the surface overlying mixtures of clayey sand and silt soils that extended to depths varying from approximately 16 to 26 feet below existing ground surface. Below these depths, with the exceptions of minor sandy and gravelly lenses the predo- minate soil consisted of light tan-grey silty sandy clay extending to the maxi- mum depth explored of from 50 to 90 feet below existing ground surface. No free groundwater was encountered in Wells 1 or 3, however, some minor seepage of water was noted in Well 3 in the sandy layers located above the clay. The seepage was so little, however, that no free water was noted during the period our crews were at the site. Groundwater was encountered at a depth of approximately 29 feet in Well 2. We understand that in the production well drilled for the existing facility, groundwater was encountered at over approxi- mately 250-foot depth and rose to within approximately 50 to 60 feet of the sur- face. It is our opinion that this artesian condition was caused by the thick clay layer. If our borings were to penetrate this clay layer, it is likely that groundwater would rise to similar depth as that of the production well. It is our opinion that groundwater encountered in Well 2 is a perched groundwater table resting on the clay layer. OTHER OFFICES nom. Walnut Creek . San Ramon . Sacramento • Fresno • Favneld 4 Merced • Rohnert Park • Los Angeles 6 Renc • Las Vegas • SL George, Utah • Denver