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ENVIRONMENTAL HEALTH DEPARTMENT, SAN JOAQUIN COUNTY 6573.4.003.03 <br /> SHADOW HAWK II September 13,2006 <br /> WORK PLAN FOR SOIL/GROUNDWATER COLLECTION Page 2 <br /> Subsurface activities will be accomplished using a Geoprobe 6600 direct push rig equipped with <br /> 2-inch diameter hollow push probe rods. These proposed Hydropunche/Geoprobes s will extend <br /> to depths of approximately 6, 9, and 30 feet below existing grade and are tentatively scheduled to <br /> be conducted on September 21, 2006,pending permit approval. <br /> Samples will be collected as follows; <br /> • Non-filtered groundwater samples will be collected using 3/8-inch diameter flexible <br /> tubing inserted into a peristaltic pump for each location and decanted into pre-cleaned <br /> analyte specific laboratory sample containers. <br /> • Soil samples will be collected using a Geoprobe continuous core sampler. <br /> • All samples will be placed in an ice-chilled cooler and transported under documented <br /> chain-of-custody to an accredited analytical laboratory. <br /> At least 48 hours prior to our subsurface explorations, we will mark the site for an Underground <br /> Service Alert (USA) utilities check. Following the completion of probes, the holes will be <br /> backfilled with neat cement grout in accordance with San Joaquin County regulations. <br /> If you have any questions on any portion of this work plan, please call and we will be glad to <br /> discuss them with you. <br /> Very truly yours, <br /> ENGEO INCORPORAWED Reviewed by: <br /> Richard Gandolf Duncan Hickmott, C.E.G. <br /> dh/ac:work plan <br /> Cc: Mr. Troy Wright, Brookfield Homes <br /> Attachments: Figure 1 —Vicinity Map <br /> Figure 2—Sample Location Map <br />