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Pacific Gas and Electric Company Environmental Services <br /> P.O Box 7640 <br /> San Francisco, CA 94120 <br /> 415/973-7000 <br /> April 15, 1992 Direct Dial415/973- <br /> Telecopy 415/973-9201 <br /> Mr. Val F. Siebal <br /> California Environmental Protection Agency <br /> Department of Toxic Substances Control <br /> 10151 Croydon Way <br /> c Sacramento, CA 95827 <br /> CI Attention: Mr. Fernando Amador <br /> Dear Mr. Siebal : <br /> Re: Docket #HSA 90/01-08 - Stockton Manufactured Gas Plant Site <br /> Subject: April 1992 Quarterly Summary Re ort <br /> This quarterly summary report was prepared in accordance with Section <br /> 3.7 the referenced order. This report summarizes technical activities <br /> conducted by PG&E in compliance with the order during the quarter from <br /> January to March 1992, and activities planned for the current and <br /> subsequent quarters. <br /> (a) Technical Activities Performed During Previous Quarter <br /> PG&E submitted revisions to the RI/FS Workplan on January 3 and <br /> March 9. Final approval of the Workplan was received from DTSC on <br /> March 26. <br /> All planned RI/FS field activities including installing borings <br /> and monitoring wells and sampling surface soils, subsurface soils, <br /> and groundwater were completed this quarter. Monthly water level <br /> monitoring was initiated in March and will be continued for one <br /> year as specified in the Workplan. <br /> The results of soil sampling at Morton Paint Company (Area III) <br /> were received and transmitted to the property owner. <br /> PG&E submitted the results of the December surface soil sampling <br /> on the Hazelton Avenue strip to DTSC on January 15 with the <br /> recommendation that additional samples be collected east of the <br /> Center Street Overpass. The results of additional sampling were <br /> reported to DTSC on February 6. PG&E recommended that a concrete <br /> cover be placed over the embankment adjacent to PG&E's property, <br /> and DTSC concurred. The concrete cover was designed, project <br /> specifications were prepared, and permits obtained. <br /> The Draft RI Report outline was prepared and approved by DTSC. <br /> Preparation of the Draft RI Report was started. <br />