Laserfiche WebLink
March 27, 2003 <br /> Ms. Wendy Cohen <br /> Sr. WRC Engineer <br /> SLIC Unit <br /> California Environmental Protection Agency <br /> Central Valley Regional Water Quality Control Board (CVRWQCB) <br /> 3443 Routier Road, Suite A <br /> Sacramento, CA 95827-3003 <br /> Subject: Soil and Groundwater Assessment at PG&E's McDonald Island Gas Storage <br /> Facility, San Joaquin County, California. <br /> Dear Ms. Cohen: <br /> Last week(3/21/2003) I spoke with you regarding a soil and groundwater assessment that <br /> was conducted at PG&E's McDonald Island Gas Storage facility located in San Joaquin <br /> County. <br /> The assessment was conducted during the summer of 2002, and a report was issued in <br /> September of 2002. The investigation was performed following the discovery of <br /> petroleum hydrocarbons during the a natural gas condensate valve excavation at the <br /> McDonald Island Compressor Station. The work plan and well permit for the assessment <br /> was approved by the San Joaquin County Environmental Health Department (EHD), (Mr. <br /> Harlen Knoll). <br /> Work activities consisted of: <br /> • Collection of soil samples from seven borings located in the excavation area <br /> • Conversion of the borings to temporary monitoring wells for collection of <br /> groundwater samples <br /> • Analysis of soil and groundwater samples for petroleum hydrocarbons and <br /> selected other constituents <br /> • Evaluation of data and preparation of a report <br /> The work plan and final report of this assessment are both enclosed. The results of the <br /> investigation indicated traces of toluene present in about half of the soil samples, ranging <br /> from 0.005 to 0.043 mg/kg. Analysis of groundwater samples showed that ethylbenzene <br /> and xylenes were present in concentrations ranging from 1.2 to 4.5 ug/l. Benzene was not <br /> detected in any of the groundwater samples (RPL < 0.5 ug/1). The concentration of <br /> aromatic hydrocarbons were all well below the maximum contaminant level for domestic <br /> water. <br /> The soil and groundwater assessment report was submitted to the San Joaquin County <br /> EHD in the Fall of 2002. We have asked the county to issue a letter of"no further <br />