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Pacific Gas and Electric Company 1401 Fulton Street <br /> Fresno,CA 93760 <br /> 20914434600 <br /> March 23, 1988 <br /> Mr. Dave Carl s CNVIROMENTAL HEALTH <br /> San Joaquin Local Health District H-RIIAIT/SERVICES <br /> Post Office Box 2009 <br /> Stockton, CA 95201 <br /> Dear Mr. Carls: <br /> This letter confirms the phone conversation between you and Mr. <br /> Mike Bennett of my staff on March 18, 1988, with regard to the <br /> elevated levels of petroleum hydrocarbons in the soil at PG&E' s <br /> Lathrop Dehydrator Station. Attached are the sampling results we <br /> have received to date. We understand the San Joaquin County <br /> Local Health District is the lead agency for the soil mitigation, <br /> with the Central Valley Region Water Quality Control Board <br /> becoming the lead agency if groundwater is affected. <br /> The Lathrop Dehydrator is an integral part of PG&E' s natural gas <br /> supply system and is presently being upgraded. The construction <br /> of new equipment foundations is currently being delayed due to <br /> this investigation. It is important to proceed with upgrading <br /> this facility in order to continue to provide reliable and <br /> efficient natural gas service to our customers. <br /> In the interest of mitigating the elevated levels of hydrocarbons <br /> in the soil , we propose to take action immediately. We plan to <br /> remove the soil located directly beneath the leach line and <br /> underneath the central portion of the southern foundation area. <br /> (See attached site plan. ) Soil samples will be taken at the <br /> limits of the excavation to help determine whether additional <br /> mitigation actions are necessary. If subsurface water is <br /> encountered during the excavation process, a sample will be <br /> taken. <br /> All samples will be analyzed for benzene, toluene, xylenes- <br /> methods 5020, 8020, total petroleum hydrocarbons-methods 5020, <br /> 8015 and triethylene glycol . Acceptable sampling and chain of <br /> custody protocol will be followed. All excavated soil will be <br /> tested and managed or disposed of as agreed upon by both PG&E and <br /> the San Joaquin Local Health District. Clean back-fill material <br /> will be placed into the excavation, allowing PG&E to continue <br /> construction activities on-site. <br />