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GROUND ZERO ANALYSIS,INC. <br /> I <br /> 1714 Main,Stet <br /> Escalon,California 95320-1927 <br /> Telephone: (209)838-9888 <br /> Facsimile: (209)838-9883 <br /> October 6, 2000 <br /> 1 � 1 <br /> Ms. Lori Duncan <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject: Addendum to Workplan for Interim Remediation <br /> North Stockton Auto Service <br /> 8709 N. Davis Road, Stockton, California <br /> Dear Ms. Duncan- <br /> Per today's phone conversation, we are writing on behalf of North Stockton Auto Service to provide <br /> you with an addendum to our',October 2, 2000_ Subsurface Investigation Summary Report and <br /> Workplan for Interim Remediation(Workplan). <br /> The Workplan proposed excavation of contaminated soil in the vicinity of the former underground <br /> storage tank (UST). The purpose of this addendum is to propose the installation of a soil boring to <br /> collect soil and groundwater samples from beneath the former UST. <br /> WORKPLAN FOR SOIL AND GROUNDWATER SAMPLING <br /> Following the completion of excavation and backfilling, a single soil boring will be installed within <br /> the confines of the excavation pit. A C57 licensed drilling company.will advance the,boring to, <br /> groundwater using a hollow stem auger drill rig. Groundwater is expected to be encountered at a <br /> depth of approximately 28-30 feet. <br /> -Beginning at a depth of 20 feet, soil samples will be collected at 5-foot intervals for field <br /> screening (odors, discolorations, FID readings), stratigraphic description and laboratory analysis. <br /> Samples will be collected using a 2-inch diameter drive sampler lined with brass sleeves. The <br /> portion of the sample to be analyzed will be immediately capped and preserved for submittal to <br /> the laboratory. One groundwater sample will also be collected for analysis. The sample will be <br /> collected by driving a Hydropunch type sampler to the desired depth and exposing the screen to <br /> the formation. The groundwater sample will be collected using a clean bailer from which it will <br /> be transferred directly into the appropriate sample containers. <br /> nsautolreportsladdendum.doc <br />