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URS • Ms Margaret Lagorto, Supervising REHS Page 5 San Joaquin County Environmental Health Department October 11, 2004 groundwater samples will be collected from the other The third boring will be advanced on site to approximately 100 feet bgs for the purpose of constructing a 2-inch-diameter groundwater monitoring well First groundwater at the site is expected between approximately 56 to 65 feet bgs Proposed boring locations are presented on Figure 2 During the drilling of each boring, a URS geologist will collect samples of the subsurface soils at 10- foot intervals beginning at 10 feet bgs A portion of each sample will be used for lithologic logging and for headspace screening with a PID A portion of each sample will also be retained and submitted to the 1 laboratory for possible analysis Subsurface lithology will be logged by the geologist according to the Unified Soil Classification System Each soil sample retained for possible chemical analysis will be collected in brass liners, capped with ' Teflon°tape and plastic end caps, labeled, and placed in a cooler on ice for delivery to a California certified laboratory under chain of custody Soil samples showing visible staining or elevated PID readings will be selected for laboratory analysis If staining or elevated PID readings are not encountered, the sample collected in the capillary fringe will be analyzed All selected samples will be analyzed for GRO by EPA Method 80158 (preparation EPA Method 5030), and BTEX,MtBE, TBA, DIPE, ETBE,TAME, 1,2-DCA, and EDB by EPA Method 8260B (preparation EPA Method 5030) Groundwater Grab Sampling A groundwater grab sample will be collected from first encountered groundwater in the soil boring advanced on Lodi Avenue using a new disposable bailer The sample will be analyzed for GRO by EPA Method 8015B, and BTEX, MtBE,TBA, TAME, DIPE, EtBE, 1,2-DCA, and EDB by EPA Method 8260B Analytical data will be uploaded into GeoTracker Shallow and Deep Monitoring Well Installation Both monitoring wells will be constructed from 2-inch-inside-diameter, Schedule 40, flush-threaded PVC well casing A Monterey No 3 silica sand filter pack will be installed from the bottom of each boring to 2 feet above the each screen A 3-foot bentonite seal will be placed above the sand packs and neat cement will be used to seal the remaining annular space to the surface A locking well cap will be placed on the top of each casing and the surface will be completed with a traffic-rated, flush-mounted well box A URS geologist will direct completion of the wells and completion details will be presented on boring logs The shallow monitoring well will be constructed in the borehole advanced on the east side of Cherokee Lane Fifteen feet of 0 020-inch machine-slotted well screen will be set from 5 feet above to 10 feet below first encountered groundwater The deep groundwater monitoring well will be constructed in the on-site deep borehole Five feet of 0 020-inch machine-slotted well screen will be set from approximately 95 to 100 feet bgs The exact screen interval will be determined in the field by a URS geologist K 1WprocessU5 BP ARC010076012004 Asse5sment1760 site assessment report with workplan V2 04 da.