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- s • <br /> UNOCAL Corporation <br /> March 9, 1994 <br /> Page 5 <br /> prepare lithologic logs of the borings. The one ten-foot-deep boring <br /> and the four 40-foot-deep borings will be backfilled to ground <br /> surface with neat cement upon completion of drilling. The neat <br /> cement backfill will be placed using a tremae pipe as required by <br /> SJCEHD regulations Groundwater monitoring wells, if required, will <br /> be constructed in the three 55-foot-deep borings <br /> Well Construction Three groundwater monitoring wells will be <br /> constructed at the locations shown on Plate 2 Wells will be <br /> constructed using 2-inch-diameter Schedule 40 PVC with 0 02-inch <br /> machine-slotted well screen The proposed well construction detail <br /> is presented on Plate 3 <br /> Soil Samples Soil samples obtained for chemical analysis, <br /> . physical testing, and lithologic description will be obtained from the <br /> borings at five-foot intervals, as a minimum Soil samples selected <br /> for chemical analysis will be collected with a split-spoon sampler <br /> fitted with clean brass sample tubes Although the actual number <br /> of samples submitted for chemical analysis will depend on site <br /> conditions and field screening data, we anticipate two samples from <br /> each boring will be submitted for chemical analysis Samples will <br /> be analyzed as described in Task 3 Q0W <br /> Soil samples will be screened in the field for the presence of volatile <br /> organic compounds using an Organic Vapor Meter phototonization <br /> detector (OVM). These data will be collected for reconnaissance <br /> purposes only, and will not be used to verify the presence or <br /> absence of petroleum hydrocarbons <br /> Drill Cuttings and Rinsate Drill cuttings will be placed on and <br /> covered with plastic sheeting. One composite sample of all drill <br /> cuttings will be collected and analyzed as described in Task 3 <br /> Steam cleaning rinsate waste water will be stored on site in <br /> 55-gallon steel drums pending proper disposal <br /> M782790-4 <br /> GeoStrategies Inc. <br />