Laserfiche WebLink
' Excavation and Sampling Report - Former Cluster UST Area <br /> WEST CLAY PROPERTIES , <br />' 639 West Clay Street, Stockton, California <br />' 1.0. INTRODUCTION <br /> At the request of Ms Tina Mayhew, Advanced GeoEnvironmental, Inc (AGE) has prepared this 7 <br />' report documenting well abandonment and overexcavatlon of hydrocarbon-impacted soil from the <br /> floor and sidewalls of a former gasoline underground storage tank (UST) excavation for 639 West <br /> Clay Street, Stockton, Cafiforma (Figure 1) The report has been prepared as required by the San <br />' Joaquin County Environmental Health Department (EHD) by letter dated 31 October 2003 <br /> This report was prepared in accordance with the California Regional Water Quality Control Board- <br />' Central Valley Region (CVRWQCB)'s recommendations and guidelines for the investigation of <br /> UST sites Site background information is provided in Appendix A <br /> 2.0 PROCEDURES <br />' Extraction well EW-1 was destroyed on 17 November 2003 as part of over-excavation activities to <br /> remove hydrocarbon-impacted soil related to an unauthorized release of petroleum hydrocarbons <br /> lie from former USTs at the site Over-excavation of the former gasoline UST Cluster excavation was <br /> conducted on 12 December 2003 The work was performed in accordance with the AGE-prepared <br /> Interim Remediation Work Plan, dated 29 October 2003 and approved by EHD on 31 October 2003 <br /> 1 <br /> 2 1 MONITORING WELL DESTRUCTION <br /> On 17 November 2003,in preparation for excavation of petroleum hydrocarbon-impacted soil at the <br /> site, extraction well EW-1 was destroyed by over-drilling the well to total depth 10-inch augers To <br />' facilitate excavation,the well was backfilled to approximately 25 feet below surface grade(bsg)with <br /> portland cement and with bentonite from 25 feet bsg to surface grade <br /> z <br /> 2 2 EXCAVATION OF HYDROCARBON-IMPACTED SOIL - <br />' V Petroleum hydrocarbon-impacted soil was excavated at the site by Valued Engineering of Stockton, <br /> California,utilizing an excavator Soil was excavated to an approximate depth of 25 feet bsg at the <br /> former gasoline UST Cluster area (Figure 2) <br /> Excavated soil was screened for`the presence of organic vapor using a using an organic vapor meter <br />' (OVM) equipped with a photo-ionization detector (PID Thermo Environmental 580B, 10 0 eV, <br /> • calibrated to isobutylene) Based on OVM readings and field observations, excavated soil was <br /> Advanced GeoEnviron mental,Inc ' <br /> z <br /> I <br />