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NEW YORK <br /> MEMPHIS <br /> ORLANDO <br /> United States Testing Company, Incâ–  MIAMI <br /> CHICAGO <br /> Unitech Services Group COLORADO SPRINGS <br /> 3536 QAKDALE ROAD-P.O. BOX 6673 <br /> SAN FRANCISCO <br /> MODESTO,CALIFORNIA 95355 (209)527-2271 MODESTO <br /> LOS ANGELES <br /> ® SAN DIEGO <br /> USTCOGC88-74 August 30, 1988 <br /> Environmental Health Division <br /> San Joaquin Local Health District <br /> 1601 East Hazelton Avenue <br /> Stockton, CA 95205 <br /> Attention: Ms. Diane M. Hinson <br /> Subject: Addendum to Plan for <br /> Sub-surface Investigation <br /> 318 West Main Street <br /> Ripon, California <br /> Dear Ms. Hinson: <br /> Please find presented below further information on our planned <br /> investigation for the subject site. This information addresses <br /> the items called out in your letter to Ms. May Gong dated August 24, <br /> 1988. <br /> 1. Drilling and Soil Sampling <br /> Sub-surface conditions will be explored by drilling five or six <br /> 8-inch diameter borings to a depth of approximately 20 feet with a <br /> hollow stem auger drill rig. Soil samples will be collected at <br /> selected depths. The auger flights will have an outside diameter of <br /> 8 inches and be 5 feet long. The augers and other drilling equipment <br /> will be steam cleaned prior to drilling. <br /> A retractable plug will be installed into the hollow-stem flight auger <br /> to prevent soil from entering the auger flights during drilling. The <br /> plug will be aff ixed to the lower end of a rod that fits within the <br /> hollow auger flights. When a target depth is reached the plug will be <br /> replaced by a Modified California Drive sampler which will be lowered <br /> to the bottom of the boring. The sampler will then be driven into the <br /> soil for a distance of approximately 18 inches. The Modified California <br /> Sampler has an outside diameter of approximately three inches and an <br /> inside diameter of 2.375 inches. The sampler will be driven by re- <br /> peatedly raising a 140 pound hammer to a height of 30 inches and drop-- <br /> ping it on the upper end of the rod until the sampler has advanced 18 <br /> inches. <br /> PAYMENT <br /> RECEIVED <br /> AUG 3 ti 1888 <br /> ENVIRONMENTAL HEALTH <br /> PERMITISEWICES <br /> MEMBER OF THE SGS GROUP(SOCIETE GENERALE DE SURVEILLANCE) <br />