Laserfiche WebLink
PLN2008-00030; Cornerstone at San Leandro Crossings <br />Mitigated Negative Declaration <br />March 20, 2009 <br />Sites will determine the presence or absence of COPCs in soils. Once soils are <br />tested, a Site specific soil management plan (SMP) will be prepared. At the present <br />time, there are no known chemical source areas or areas of soil contamination on <br />either Site. The protocols to be followed in the event that unknown areas of <br />contamination are identified during development are described in this section. <br />• Procedures for Discovery of Unknown Areas of Contamination: Site development <br />activities may result in the identification of previously unknown areas or types of <br />contamination. Unknown conditions which may trigger contingency monitoring <br />procedures during site development include, but are not limited to, the following: <br />o Oily, shiny, or chemical saturated soils; <br />o Soil with a significant chemical or hydrocarbon -like odor; or <br />o Significantly discolored soils. <br />Upon the discovery of one of the conditions identified above, the contractor will <br />conduct the contingency monitoring. Contingency monitoring, if conducted, will <br />consist of the following steps: If unknown areas of potential discolored soils are <br />encountered, additional analyses should be conducted for the suspected constituents <br />to assess the actual composition of the suspected contamination. A State <br />environmental regulatory agency should be contacted for assistance in determining <br />if additional sampling and potential mitigation is necessary. If the encountered <br />materials are suspected to contain volatile organic chemicals, the following <br />contingency monitoring procedures may be followed: <br />Conduct contingency monitoring by taking organic vapor readings using an organic <br />vapor meter (OVA or an organic vapor analyzer (OVA) to screen for the presence <br />of fuel, oil, or solvents. If the OVM/OVA indicates that an unknown area of fuel, <br />oil, or solvents has been detected, then a State environmental regulatory agency <br />should be notified to determine if additional sampling is appropriate prior to <br />continuing construction in that area. OVM or equivalent screening methods will be <br />conducted by experienced personnel only. <br />If an unknown area of soil contamination has been identified, and the State <br />environmental regulatory agency requests additional characterization, the following <br />steps will be taken: <br />o Soil samples will be collected from the identified area and analyzed for the <br />likely COPC, depending on the suspected type of contamination. The <br />sampling strategy will be discussed with a State environmental regulatory <br />agency prior to the initiation of the sampling activities. Analytical results <br />collected from the suspected source will be compared to the health -based <br />screening levels and results discussed with a State environmental regulatory <br />agency. If the levels are below the relevant health -based screening levels and <br />the State environmental regulatory agency concurs, no additional action may <br />be necessary. <br />11 <br />