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• The excavations will be constrained by the irrigation pipeline to the east, utilities <br /> and to the north, south, east and west and the trailers to the west <br /> • Excavations will advance to the capillary fringe and into the aquifer <br /> approximately two feet The aquifer as relatively sandy and Wright desires to <br /> limit the potential for excavation caving The excavations will be dewatered at <br /> least once to remove contaminated groundwater anticipated to flood the <br /> excavation Soil samples and groundwater samples will be collected for mass <br /> balance calculations, characterization for disposal of soil and potential on site <br /> . treatment of purged water <br /> • Excavations will be backfilled immediately dewatering with a clean fresh- <br /> quarried product consisting of pea gravel up to two feet above the capillary fringe, <br /> and then backfilled with a compacted engineered class II fill compacted to the <br /> surface Asphalt pavement will be replaced an the former tank pat area to match <br /> existing grade <br /> The PHSEHD has indicated that this interim remedial action is favorable This work <br /> could be starting as early as the month of November with PHSEHD approval In <br /> addition, the work would have to be approved by the current property owner A report of <br /> the excavation including the quantity of soil and groundwater removed, chemical analysis <br /> mass balance calculations and chain-of-custody forms and narrative of removal and <br /> monitoring well destruction and reinstallation will be prepared <br /> If you have any questions, please call <br /> Sincerely, <br /> Wright Environmental Services, Inc. <br /> John Lynch Christopher M Palmer <br /> President C E G 1.262, H G 246 <br /> Cc Ms Janice Cox-Brown <br /> Mr Dennis Cox <br /> Mr Gary L Cox <br /> Mr Earl Bremstem, Firestone Tare-Cox Bros <br /> Mr James Barton, RWQCB, Region 5 <br /> Reference <br /> Wright Environmental Services, Inc March 27, 2003, <br /> Corrective Action Plan Approach Selection and Response, <br /> San Joaquin PHSEHD for Mr Ed's Muffler (Cox & Cox) <br /> 595E 11th Street, Tracy, CA 95736, PHS-EHD Site Code 1933 <br /> . Attn Ms Janice Brown, 1593 Arrowhead Drive St Helena, CA 94573 <br /> Page 5 <br />