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URS <br /> AN INTERNATIONAL PHO.'ESSIONAE SERV', FS ORGAN LAT!-JN <br /> All soil samples will be collected using a six inch length hand driven drive <br /> sampler lined with two (2) three inch brass sample rings. Upon sample <br /> retrieval, the bottom ring will be removed, capped with aluminum foil and <br /> plastic end caps and sealed with tape. <br /> The samples will be labeled, logged on a chain of custody form and stored <br /> in an ice chest cooled with blue ice. All samples will be delivered to <br /> California Water Labs(DHS Certificate#130)in Modesto,California within <br /> 24 hrs of collection. All samples will be analyzed for total petroleum <br /> hydrocarbons (by LUFT Procedure) and volatile aromatic hydrocarbons (by <br /> EPA Method 8020). The composite sample will be composited in the <br /> laboratory prior to analysis. <br /> Comment: 3. Residual contaminates remaining at the conclusion of the investigation <br /> attempt shall be addressed in a soil remediation plan. The soils remediation <br /> plan shall include a feasibility study for each option proposed. <br /> Response: Soil remediation will be accomplished by one of two methods, onsite <br /> treatment or offsite disposal. Since unleaded gasoline is the primary <br /> contaminant and is relatively volatile, aeration of the soils in small batches <br /> (in order to keep within Air Quality Board requirements) will most likely <br /> be used to remediate the soils. Because this procedure is widely used and has <br /> been shown to be consistently effective in the treating of gasoline <br /> contaminated soils, and the volume of contaminated soil is expected to be <br /> small, we feel that performance of a feasibility study is not warranted. <br /> Comment: 4. Prior to performing the 24 hour pump test, in order to eliminate the <br /> possibility of drawing free product lowering to the aquifer, it is <br /> recommended that free product be removed during the investigative phase <br /> of the work being conducted. <br /> Response: A 24 hour pump test will be performed only if gasoline contamination is <br /> found within the lower aquifer zone. If the lower zone is uncontaminated, <br /> three rising head slug tests will be performed in place of the pump test. If <br /> the pump test is warranted, removal of free floating product will be <br /> attempted prior to the pump test by extraction of free-floating product from <br /> a shallow well placed adjacent to the central deep well (MW-04D). So that <br /> this may be accomplished if necessary, well MW-04S will be moved to the <br /> location shown in Figure 1. No groundwater will be extracted during this <br /> removal process. Extracted product will be placed in sealed 55 gallon drums <br /> and disposed of according to hazardous waste regulations. <br /> Comment: 5. Surface discharge of bailed/pumped groundwater is a permitted function of <br /> the Regional Water Quality Control Board. <br /> Response: All development water will be contained onsite. Following receipt of <br /> groundwater sample results, final disposition of the purged water will <br /> determined. <br /> 65550.01/07249/UnionIce.giw 8 <br />