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Chuck White April 1, 1988 <br /> The soil excavated at the Lathrop Dehydrator will be transported directly <br /> to the Manteca Substation by a registered hazardous waste hauler in cov- <br /> ered, 15-cubic-yard dump trucks, accompanied by a uniform hazardous waste <br /> manifest. It is anticipated that all excavated soil will be moved to the <br /> Manteca Substation within a five-day period. <br /> The soil delivery at Manteca Substation will be supervised by Groundwater <br /> Technology, Inc. (GTI ). As required by GTI , nutrients will be added to the <br /> soil upon delivery to enhance the degradation process. The soil remedia- <br /> tion will be carried out and monitored by GTI until the level of total <br /> petroleum hydrocarbons in the soil is below 100 ppm. At that point, the <br /> soil will be considered for use a backfill material or hauled to a Class I <br /> landfill , as deemed appropriate by both PG&E and the San Joaquin Local <br /> Health District. Given the expected weather patterns and the hydrocarbon <br /> levels in the soil , it is anticipated this bio-remediation process will <br /> take about 60 days to complete. An overview of GTI ' s bio-remediation pro- <br /> cess is attached. <br /> The requested variance is important to PG&E because it will allow more <br /> efficient and effective field operations , and reduce costs to PG&E rate- <br /> payers without adversely affecting the public health or the environment. <br /> The Lathrop Dehydrator is an integral part of PG&E's natural gas supply <br /> system and is presently being upgraded. The construction of new equipment <br /> is currently being delayed due to this investigation. It is important to <br /> proceed with upgrading this facility in order to continue to provide <br /> reliable and efficient natural gas service to our customers. PG&E wishes <br /> to start this project as soon as possible. Your prompt attention would be <br /> appreciated. <br /> If you have any questions, or wish to discuss these matters in greater <br /> detail , please contact Mike Bennett of my staff at 209/443-5568. <br /> Gar Fairbanks <br /> Re' ion General Services Manager <br /> GLF/MAB/VTZ:nkw <br /> cc: Zvi d R. Carl s <br /> San Joaquin County Local Health District <br /> Lakmir Grewal <br /> San Joaquin County Air Pollution Control District <br /> Chuck McLaughlin <br /> Cal . Department of Health Services <br /> Antonia Vorster <br /> Region Water Quality Control Board <br /> Enclosures <br />