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Royal Oak Savings&Loan <br /> Knal Remediation PMn <br /> Page. 2 <br /> the site. Soils aeration is the proposed method of remediating the soils, and <br /> aeration will take place on-site. The original estimate was to remove 2,000 <br /> yards of soil with approximately 1,000 yards estimated to be contaminated. <br /> 2.3 Actual Site Gondltloirs <br /> Site conditions have changed since the Canonie and Harding Lawson reports <br /> were made. Groundwater has 1ropped approximately 9 feet since the 4 wells <br /> were installed. <br /> 1n addition, we found the soil conditions to be sandy with a clay Ja�ter <br /> " Chroughout the excavat on. Soil contamination was encountered Lt a depth of 14 <br /> Let in the clay lay:.r and hydrocarbon odors were present to a depth of <br /> approximately 20 fret. San Joaquin County requires that soils be removed to a <br /> ND or non-detectable level and the excavation was extended to a depth'of 24 <br /> feet. i,iroundwate r-was eneountered at.aAepth-of Z5:feet. Because of the <br /> additional depth required to�mmove the soils with odors, and for safety n2sons, <br /> the side walls had to be sloped to a final dimension of approximately 81 by 78 <br /> feet at the top and 39 by 37 feet at the bottom. The actual quantity of soil <br /> .� excavated was 4,394 yards plus approximately 350 yards in the access ramp <br /> area. Contaminated soil to be aerated is 903 yards. <br /> 2.4 Undergraw d Wank <br /> -, In the process of excavation an underground fuel tank was discovered in the <br /> northwest comer of the proposed excavation. The tank was not previously <br /> known to have existed, and from outward appearances the tank had been <br /> " emptied, partially crushed,and reburried where we found it. No odors from <br /> within the tank, nor from the soil beneath the tank were noted. <br /> : <br /> t <br /> **San Joaquin County has their Environmental Health Division divided into <br /> `~ "underground tanks" and "site remediation". Because of this division, it was <br /> required that we obtain separate permits and separate samples in association <br /> - -- with the tank removal.-A separate report must also be submitted to-the County--:---- <br /> for <br /> ounty-.for review and closure of the tank. <br /> t <br /> W1 F Environmental has included in this report,all otiue analytical data <br /> associated with this tank; as well as a diagram showing its location. <br /> I <br />