Laserfiche WebLink
Q10/9 <br /> SECOR www.secor.com 1 <br /> INTERNATIONAL 3017 Kilgore Road,Suite 100 <br /> S E Q INCORPORATED Rancho Cordova,CA 95670 <br /> 916-861-0400 TEL <br /> 916-861-0430 FAX <br /> August 30, 2007 R9* <br /> Ms.Victoria L. McCartney Zola Joaquin County Environmental Health Department ��✓j�� <br /> 600 East Main Street '° q0�✓�IEr �00� <br /> Stockton, California 95202-3029 � ���Tjs � <br /> RE: Work Plan for Vertical and Lateral Delineation <br /> 76 (Former BP) Service Station No. 11193 <br /> 3202 West Hammer Lane / <br /> Stockton, California 95209 <br /> SECOR Project No: 77CP.02391.03177BP.11193.02 I <br /> l <br /> Dear Ms. McCartney: <br /> SECOR International Incorporated (SECOR)has prepared this letter on behalf of Atlantic Richfield <br /> Company (a BP affiliated company) and ConocoPhillips (COP) to present a work plan for the <br /> installation of three additional groundwater monitoring wells at the site referenced above(Figure 1). <br /> The purpose of the proposed work is to further assess the lateral extent of methyl tertiary butyl <br /> alcohol(MtBE)concentrations down gradient of wells MWA 1 and MWA 2 and to assess the vertical <br /> extent of hydrocarbon impacts, if any, to deeper groundwater at the site. A summary of previous <br /> investigations and site history is included as Attachment A. <br /> In a letter dated May 24,2007,and in an extension of submittal letter dated July 25,2007,San Joaquin <br /> County Environmental Health Department(SJCEHD)directed Atlantic Richfield Company and COP to <br /> submit a work plan to conduct a vertical assessment of groundwater contamination beneath the site, <br /> and define the lateral extent of groundwater contamination downgradient of monitoring wells MW-11 <br /> and MWA 2 (Attachment B). y <br /> PROPOSED SCOPE OF WORK <br /> The proposed scope of work will consist of the installation of one on-site deep groundwater <br /> monitoring well (MW-13)that will be completed in the .water-bearing zone in the vicinity of the <br /> USTs, and two off-site groundwater monitoring wells MW-14 and MW-15 of the site to an <br /> approximate depth of 30 feet below ground surface (bgs). A summary of the planned field work is <br /> presented below. Field and laboratory procedures are provided in Attachment A. G <br /> • Health and Safety Plan (HASP). As required by the Occupational Health and <br /> Safety Administration (OSHA) Standard "Hazardous Waste Operations and <br /> Emergency Response" guidelines (29 CFR 1910.120), and by the California <br /> Occupational Health and Safety Administration (Cal-OSHA)"Hazardous Waste <br /> Operations and Emergency Response"guidelines(CCR Title 8,Section 5192), ; <br /> SECOR will update the current site-specific HASP prior to the commencement of <br /> l <br /> 1ABP-ARC0105 BP-GOP Sites1111931Work Plans111193 Vertical Delineation WP.doc I <br />