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16 S�IL� <br /> Environmental Technology, Inc <br /> Del Mar's quality control program includes the following criteria <br /> • Development of, and strict adherence to principles of good laboratory <br /> practice. <br /> • Consistent usage of standard operating procedures <br /> • Establishment and adherence to carefully designed protocols for <br /> specific measurement programs <br /> • Use of reliable and well-maintained equipment <br /> • Employment of appropriate calibrations and standards <br />' • Maintenance of all operations by management and senior personnel. <br /> Del Mar's quality control program results in a measurement system with <br />' statistical control, with errors reduced to acceptable levels and characterized <br /> statistically <br /> 7.0 HEALTH AND SAFETY PLAN <br /> The Health and Safety Plan was prepared for SOTNs personnel and their <br /> subcontractor in accordance with CFR 1910-120, to work in a hazardous <br /> environment area The safety rules and requirements for drilling activities at <br /> the U-Haul Center #709-50 facility, 2701 N Wilson Way Stockton, California, <br />' were strictly enforced at the time of drilling activities and water sampling <br /> activities. The provisions in this plan apply to employees of SOTA and their <br /> subcontractor. Employees of the U-Haul Center, Federal, State, and local <br /> agencies should observe the safety rules and requirements established by their <br /> respective organizations. <br /> 8.0 CONCLUSIONS AND RECOMMENDATIONS <br /> The purpose of the additional site assessment was to further delineate the <br /> extent of petroleum hydrocarbons that have impacted the soils and <br /> groundwater at the subject site, and to determine if potential off-site sources <br /> contributed to the hydrocarbon plume on-site. <br /> • The soil analytical results from the "off-site" monitoring well MW-7 <br /> indicated the presence of a light petroleum based solvent in the soil at 20 <br /> feet bgs (MW-7 at 20). It is our understanding that there is no historical <br />' record of solvents being used at the U-Haul Center site and, according to <br /> the finger print analysis, the reported release was estimated to have <br /> occurred between 4 and 12 years ago(i e , 1984 to 1992) <br /> It is believed that "off-site" petroleum and/or solvent related plume is <br /> contained "off-site" and is independent of U-Haul Center source The "off- <br /> site" source is an isolated instance (Figures 5 and 6) <br /> 9 <br />