FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

Prelimin•Environmental Assessment Work Plan Pittman Elementary School April 21,2003 Revised July 2,2003 Page 7 4.0 REPORTING A PEA Report will be prepared for submittal to the DTSC describing the results of the investigation. The Preliminary Endangerment Assessment Guidance Manual will be used for final evaluation of the site. At a minimum the report will include: (1) an executive summary, (2) introduction, (3) site description, (4) background information, (5) apparent problem statement, (6) environmental setting, (7) sampling activities and results, (8)evaluation of risk and hazard, and(9) conclusions and recommendations. The evaluation of potential risks and hazards shall be conducted by applying the following three criteria for determining whether a metal is a chemical of potential concern (COPC): 1) Compare the highest site concentration with the highest background concentration. If the site concentration is equal to or less than the background, the metal may be eliminated as a COPC. 2) Compare the site arithmetic mean concentration with the highest background concentration. If the site mean is less than the highest background, then the metal may be eliminated as a COPC. 3) Compare the site arithmetic mean concentration with the background 95% upper confidence limit (UCL) concentration. If the site mean is less than the background 95% UCL, then the metal may be eliminated as a COPC. Pesticides, methane, hydrogen sulfide, VOCs, and PCBs will be considered COPCs if they are detected in any of the samples. )t Any constituents detected in soil vapor samples will be evaluated according to the Johnson and Ettinger Model for Subsurface Vapor Intrusion into Buildings. 5.0 SCHEDULE Public notice of the planned fieldwork will be initiated after approval of the work plan by the DTSC. The DTSC will be notified seven days in advance of any planned fieldwork. Fieldwork will begin within approximately ten days (weather permitting) after approval of this work plan by the DTSC and when notification from the client indicating access to the site has been secured. The field activities outlined above can be completed in two weeks (weather permitting). Laboratory analyses typically require four to six weeks to complete. Condor can provide a draft report approximately three weeks following receipt of the laboratory analytical results with a draft final two weeks later. A revised detailed project schedule R prepared with Microsoft Project is included in Appendix F. If you have any questions or require additional information,please call David Wood at(209)234-0518. Respectfully submitted, CONDOR EARTH TECHNOLOGIES, INC. .RED Fo(o/ G c K. W000 Marikka L. Hughes David K. Wood No. 6532 ' Staff Geologist Manager of Environmental Se 'c California Registered Geologist Hazardous Substance Removal C 2 P:\3638 CSUS Stockton Campus Elementary School (SUSD)\3638E Pittman Elementary Final PEA WP\Work Plan Revisions\3638E PEAWP revised 7-2-03.doe 1 A till CONDOR