Laserfiche WebLink
`*{taFCM ,CALIFORNIA REGIO WATER QUALITY CONTROL BOARD <br /> �- CaIIEPA <br /> CENTRAL VALLEY Ri�V1ON <br /> " _ e 3443 Routier Road,Suite A ` <br /> Sacramento,CA 95827-3098 r ii <br /> QUAb1f ' Phone(916)255-3000 , <br /> FAX(916)255-3015 t �� Pete Wilson,Governor <br /> 13 February 1998 <br /> Ms. Margaret Lagorio <br /> San Joaquin County Environmental Health Division <br /> 304 E.Weber Avenue, Third Floor <br /> Stockton, CA 95201-0388 <br /> FORMER TOWN & COUNTRY CHEVRON, 13336 EAST HWY 88,LOCKEFORD, SAN JOAQUIN <br /> COUNTY <br /> We received your 29 December 1997 letter recommending"No Further Action Required" for the above site. <br /> After reviewing our files and Steve Sasson's comments, additional information, as explained in the enclosed <br /> memo and completed checklist, is needed prior to issuance of a"No Further Action" letter from this office. <br /> You and Ms. Pat Anderson, have agreed to delay issuance of the "No Further Action" letter for two weeks. <br /> We are concerned that the extent of contamination beneath the gasoline tanks is greater than that determined <br /> by the consultant. <br /> We have determined that the following actions are needed. <br /> • The lateral and vertical extent of contamination needs to be determined, and the mass of <br /> remaining contamination needs to be calculated for the contamination beneath the gasoline tanks. <br /> • If groundwater is not encountered,then the potential for petroleum contaminated soil to impact <br /> groundwater needs to be determined. Soil samples need to be analyzed by the Waste Extraction <br /> Test(WET) or Toxicity Characteristic Leaching Procedure (TCLP), and a computer model needs <br /> to be conducted to simulate the spread of contamination through the vadose zone. <br /> • If petroleum contaminated soil extends to the capillary zone or the water table, groundwater <br /> samples need to be collected and analyzed for these contaminants to determine the impact of the <br /> petroleum contamination on groundwater. <br /> In a I 1 February 1998 conversation between the consultant and Board staff,we recommended additional <br /> definition of the vertical extent of contamination to meet the requirements for closure. Although,the <br /> consultant believed the extent of contamination had been essentially defined,he agreed to recommend that <br /> the responsible party meet the Board's requirements for closure. If a meeting is needed to further discuss <br /> these issues, please call Ms. Pat Anderson at(916)255-3128. <br /> I �OC-t R pv,6 <br /> . `J. LAWRENCE PEARSON <br /> Supervising Engineer <br /> Enclosures <br />