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' California Regional- Water Quality Control Board <br /> Central Valley Region �� , , �T •. <br /> Steven T.Butler,Chair .;,'�F <br /> Winston H.Hickox -- - Gray Davtsa <br /> Secretary for Sacramento Main Office `� N - rp ,� Governor <br /> I <br /> Environmental Internet Address: http://www.swrc6.ca.gov/—rwgcb5 I7 1: 36 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> 3 September 1999 <br /> Ms. Katie Hower _ <br /> Chevron Environmental Management Co. <br /> 6001 Bollinger Canyon Road <br /> P.O. Box 6012 <br /> San Ramon, Ca 94583-0712 <br /> SAMPLING PLAN, CHEVRON PIPE LINE COMPANY,MANSFIELD PROPERTY, TRACY, <br /> SAN JOAQUIN COUNTY <br /> I have reviewed Geomatrix's 13 August 1999 Schedule and Plan for Additional Sampling for the <br /> Mansfield property site in Tracy. The sampling plan proposes to advance one boring at the site to collect <br /> soil and groundwater samples which will be used to determine the presence of dissolved-phase <br /> petroleum hydrocarbons in groundwater.The sampling plan states that the assessment will be conducted <br /> downgradient of a previously delineated area of petroleum hydrocarbon affected soil and the data will <br /> finalize the site assessment for the property. <br /> The sampling plan is hereby approved provided that the following comments are addressed and/or <br /> incorporated into the sampling plan. <br /> 1. The sampling plan should explain how the soil contamination plume surrounding MB-I was <br /> established when there are only three sampling locations within or in the vicinity of the plume.The <br /> proposed sampling locations.about 100 feet north of the edge of the MB-1 plume. It should be <br /> moved within 50 feet of the plume. <br /> 2. The sampling plan should include step-out procedures in case the one sample location does not <br /> define the extent of the dissolved plume. <br /> By 1 October 1999, I request that you submit a report which summarizes the investigation findings and <br /> provides recommendations and a time schedule for implementation of additional work, if necessary. <br /> Please inform me at least 72 hours prior to initiation of fieldwork so that I may be present to observe <br /> and/or take split samples. <br /> California Environmental Protection Agency <br /> �a Recycled Paper <br />