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.California Regional Water Quality Control Board <br /> Central Valley Region , <br /> Robert Schneider, Chair <br /> Winston H.Hickox Gray Davis' <br /> Secrearyjor Sacramento Main Office Governor <br /> Environmental Internet Address: h4:l/www.swrcb.ca.gov/—rwgcb5 Q <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 -"" <br /> Phone(916)255-3000•FAX(916)255-3164 -71 <br /> r.- <br /> 1 <br /> �i <br /> 1 February 2001 <br /> Mr. Curt Russell <br /> Pacific Gas and Electric Company CD <br /> 375 North Wiget Lane, Suite 200 <br /> Walnut Creek, California 94598 <br /> GROUNDWATER MONITORING REPORTS, PG&E McMULLIN DEHYDRATOR <br /> STATION, SAN JOAQUIN COUNTY <br /> We have reviewed the 8 January 2001 Fourth Quarter 2000 Groundwater Monitoring and <br /> Sampling Report, submitted by the Pacific Gas and Electric Company for its former McMullin <br /> Gas Dehydrator Station. Results from the November 2000 sampling show that detectable <br /> concentrations of the constituents of concern are present in five of the eight monitoring wells. <br /> Monitoring well MW-7 contained the highest concentration of benzene at 610 pg/l and of total <br /> petroleum hydrocarbons in the gasoline and diesel range at 5,200 and 3,100 µg11, respectively. <br /> We have the following comment on this document. <br /> Injection of an oxygen releasing compound (ORC) in August 1998 had a marked effect on <br /> reducing the contaminant concentrations at this site. PG&E should consider an additional ORC <br /> application. PG&E previously verbally proposed monitored natural attenuation (MNA) as a <br /> remedial measure at this site but has not prepared a remedial action plan. Based on the current <br /> data, MNA is not reducing contaminant concentrations in the groundwater. Therefore, an <br /> alternate remedial strategy is needed. <br /> By 30 April 2001, please submit a feasibility study report, prepared in general accordance with <br /> the enclosed Items to he Included in a Feasibility StudytRemedial Options Evaluation Report. <br /> If you have any questions, you may call me at (916) 255-3082. <br /> ,de�. <br /> )�— <br /> YMASERRA <br /> Site Cleanup Unit <br /> Enclosure <br /> cc: Mr. Jeffery C. Wong, San Joaquin County Public Health Services, Stockton <br /> Ms. Linda Gonsalves, PG&E, Walnut Creek <br /> Mr. Fred F. Flint, PG&E, San Ramon <br /> California Environmental Protection Agency <br /> �a Recycled.Paper <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consuinpiion. Fora list of <br /> simple ways you can reduce demand and cut your energy costs,see out.Web-site at http:llwww.swreb.ca.gov/rwgcb5 <br />