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-� proposal dated March 15, 1990. This excavation was performed on <br /> Julytl, 12, and 13, 1990 TFCC performed a further excavation of <br /> the waste oil tank area. The repGrt of findinos is included in the <br /> attached Appendix A. The area was excavated to the saturated zone <br /> 0.5 feet below surface grade. <br /> of the water table-approximately 1 <br /> Analytical results from soil samples collected immediately above <br /> the saturated zone indicated concentrations below detection limits, <br /> Purgeable Halocarbons were not tested because none were detected in <br /> the soil samples collected from the base of the UST. Analysis far <br /> TPHg was inadvertantly not tested for ?n thesoilaterples collected <br /> was collected <br /> from the staurated zone. A sample of the p Pur eable <br /> and analyzed for TPHg/BTEX, EPA Method 5030-8015/602, <br /> g <br /> Halocarbons-EPA Method 601, and oil and Grease-Standard Td Method 503 <br /> aPH 7.5 ppb <br /> D & E. Results indicated concentrations of lm oil and Grease. <br /> BTEX, 4.2 ppb (1,2-Dic loroethane) and 2.8 t wells on <br /> r-ecommendats includedto tinithesAuguoil borings and <br /> st 14, 1990 TECCnreportg(Appendix <br /> the site wa <br /> A) <br /> SITE STATUS <br /> The monitor well installations for the Phase Ii soil and <br /> groundwater contamination assessment (Remedial Investigation) is <br /> Presently planned for this site upon approval by SJCPHS-EHD to <br /> proceed with this remedial investigation. <br /> SCOPE OF WORK <br /> e investigation and assessment process <br /> During this phase of th `TECO <br /> Intends to: <br /> 1. Install 3 groundwater monitoring wells in the approximate <br /> 4-inch well will be <br /> locations shown in Figure 3'exccavated area. Two, 2-inch <br /> installed in the previously <br /> in appropriate <br /> diameter wells willinstalled on the ti opropn the the <br /> locations that will aid <br /> in gradient and also help assess <br /> asolpnesUSTetankpit <br /> hydrocarbon <br /> located to the <br /> contamination in the old g inch <br /> The two, 2-he <br /> east of the former waste oil tank pit. 7 <br /> approximate depth of <br /> diameter wells will be installed to rox mate depth of 20 feet <br /> The wells will be installed to an app <br /> or to a sufficient depth to penetrate at least 15 feet below <br /> the depth that the saturated o be a potentialcaquitard, beould <br /> a clay layer, that app <br /> observed at a depth of less than 15 feet through the saturated <br /> zone, the well will be completed above this layer. These wells <br /> to the attached Drilling <br /> will be installed according , Sealing <br /> and Sampling Protocol.. <br /> -foot intervals using a California-Modified <br /> 7.. Sample soils at 5 <br /> r and qualitatively analyze the headspace for <br /> split spoon sample <br /> 1 PAGE 3 OF 5 <br /> H:\APPS\WP51\TOM\275GRNTLN WRKPLN <br />