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aORS'Graifiw wood lwd Clyde SRobin to 100 <br /> Santa Barbara <br /> CA a CA 9311 17 <br /> A Division of URS Corporation Tel 805 964 6010 <br /> Fax 805 964 0259 <br /> February 4, 2000 Offices Worldwide <br /> Ms Margaret Lagorio, REHS <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> 304 E Weber Avenue, Third Floor - <br /> Stockton, California 95202 =� <br /> Cn <br /> Re Caltrans District 10 Stockton Yard Maintenance Station, 1604 South B Street <br /> Project No. 4104010004 <br /> Dear Ms Lagorio <br /> On behalf of Caltrans District 10, URS Greiner Woodward Clyde (URSGWC) is pleased to submit to <br /> San Joaquin County Public Health Services (SJCPHS) groundwater analytical results and figures <br /> depicting groundwater data at the Stockton Yard Maintenance Station The site is located at 1604 B <br /> Street, Stockton, California (Figure 1-1) URSGWC collected discrete vertical groundwater samples <br /> from two wells at the Stockton Yard site on April 7, 1999 A report describing the sampling procedures, <br /> analytical results, historical groundwater concentration and elevation trends, local well survey, hydraulic <br /> . conductivity estimates, and the estimated mass of petroleum hydrocarbons in soil and groundwater is in <br /> progress The completed report will be submitted to your office within 30 days The results will be used <br /> in the human health risk assessment and evaluation of remedial alternatives to be conducted for the <br /> Stockton Yard site <br /> BACKGROUND <br /> On February 10, 1999 a meeting was held with the Central Valley Regional Water Quality Control Board <br /> (CVRWQCB) and the SJCPHS At that meeting it was agreed that an additional groundwater <br /> investigation was needed to complete the delineation of petroleum hydrocarbons at Stockton Yard before <br /> preparing the Human Health Risk Assessment and Groundwater Impact Analysis Report The additional <br /> site investigation data and analysis that were requested included <br /> a A survey of public and private groundwater wells within 500 feet of Stockton Yard <br /> • Vertical delineation of petroleum hydrocarbons in groundwater <br /> ® Estimation of hydraulic conductivity <br /> o Estimation of petroleum hydrocarbon mass in soil and groundwater, and <br /> o Estimation of natural attenuation to CVRWQCB Basin Plan concentrations <br /> Task 1 —Survey of Public and Private Groundwater Wells <br /> . At the February 10, 1999 meeting, the CVRWQCB requested a survey of public and private groundwater <br /> wells within 500 feet of Stockton Yard URSGWC has reviewed public well records maintained by the <br /> California Water Service and by a private well driller who has installed wells in the vicinity of the site <br /> 11SBA11S HARED4PROJ\41040100041SYYARDISJCPHSLTR STKTNYD DOC 242000 <br />