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«f. <br /> 3 <br /> SIVE HISTORY <br /> The site was constructed as a service station by Regal Petroleum <br /> Corporation ill 1950. Prior to that the Wheeler family residence <br /> had been located there since the turn of the century. In July . <br /> 1981, Wickland Properties took control of the site and leased it <br /> from the Wheeler family. <br /> Wickland Properties, subcontracted Town & Country Contractors to <br /> perform the underground storage tank and product line removal in <br /> accordance to the. County Health guidelines. On September 26, <br /> 1989, Western Geo-Engineers (WEGE) monitored the site with a <br /> LEL/02 meter and a PID meter for health and safety purposes and <br /> obtained the required samples of the tank and product line <br /> excavations. <br /> Five 10,000 gallon single galled carbon steel underground storage <br /> tanks wei, removed by Town and Country Contractors on September 26 <br /> and 27. 1989., two regular gasoline, two unleaded gasoline and one <br /> super unlcraduid gasoline. The bottom of the fillup end of tank 4 <br /> appeared to have failed, (corrosion with possible pin hole) , <br /> sample T4A. <br /> Soil sampling of the tank excavation done on September 29, 1989, <br /> and the product line trenches done on October 5, 19891, revealed <br /> that the soil is contaminated with gasoline, kerosene and fuel oil <br /> range hydrocarbons (aged-degraded gasoline) , see Table 1. <br /> A work plan was submitted and revised on November 13, 1989, and <br /> the assessment o€ the site started. During this time, six ground <br /> water monitoring wells were installed, the pump dispenser area was <br /> demolished, the tank field excavation and pump dispenser areas <br /> were overexcavated, the excavated soil aerated and the excavations <br /> backfilled with 1/4" rounded pea gravel to the 12 foot depth and <br /> then compact •'i backfilled with the aerated clean native soil to <br /> surface. Aft <br /> �.r completion of backfilling the excavations three <br /> vapor recovery wells <br /> sFwere installed 3A, 3B i 3C.the overexcavated areas <br /> (PI, P3 and EX) , see <br /> Ground water monitoring/sampling have taken place on December 1, <br /> 1969, January 12, 1990, August 24, 1990 and November 21, 1990, the <br /> next scheduled ground water monitoring/sampling is to take place <br /> - _- <br /> in March 1991, see Figure 4. As mentioned above in the <br /> Introductiona vapor-extraction-pilot-test-has-.been-completed, see <br /> WEGE report ."Pilot Test for vapor extraction, former, Regal Station <br /> 504", dated January 17, 1991 <br /> page 3 <br />