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44%INEEMOG <br /> v►RONM9Aq, <br /> Date: October 19, 1989 CCT d 1989 <br /> San Joaquin Environmental Health Dept. <br /> 1601 East Hazelton Ave . <br /> Stockton, CA. 95205 <br /> Subject : Site Characterization for Sunnyside Produce <br /> 8960 W. Walnut Grove Rd . <br /> Thorton, CA. 95686 <br /> To Whom It May Concern; <br /> Petro-Check Inc . , was contracted by Sunnyside Produce for <br /> testing of underground storage tanks . The regular and unleaded <br /> tanks came in tight . However the diesel tank came in over a <br /> . 05 leak rate. The tank was excavated and an isolated tank <br /> test was performed, only to fail again . <br /> Upon excavation of diesel tank we noticed some contamination <br /> in the backfill . The owner has contracted PGI Environmental <br /> Engineering Inc . , for a site characterization study for the <br /> above referenced property. <br /> We are purposing to the County of San Joaquin Dept . of <br /> Environmental Health a program to determine the limits of <br /> the petroleum contamination . It is proposed that borings <br /> be drilled in the locations shown on the attached site plan. <br /> Additional borings would be drilled should geologic conditions <br /> vary significantly. The borings will be advanced to the depth <br /> of 70 feet , or a lessor depth should there be either a lack <br /> of significant contamination, or a thick confining clay layer <br /> or a shallow groundwater zone. Soil samples will be collected <br /> per the direction of the registered geologist supervising <br /> the drilling . Sample preparation and analysis will proceed <br /> as outlined in the attached Quality Assurance, Quality Control <br /> Plan. The Plan also presents the protocol to be followed <br /> for the drilling program. Drilling will be coordinated with <br /> the County of San Joaquin Dept . of Environmental Health . <br /> Thank you for this opportunity to have been of service . <br /> Sincerely, <br /> PCI ENVIRONMENTAL ENGINEERING INC . <br /> r <br /> David A. Castle <br /> Chief Exec. Officer <br /> DC/mp <br /> cc f le 2076 Acoma Street • Sacramento. CA 95815 • (916) 927-1788 <br />