ARCHIVED REPORTS_XR0004058 - Laserfiche WebLink

Home Browse Search

EV "RONMENTAL HEALTH DIVISION 30;. Weber Ave,Third Floor P O. Box 388, Stoc on CA 95201-0388 S"i-ECORApproved Denied ( Conditionsi3Oe-J�� international Incorporated November 24, 1997 131,1L I Date 11,(L-"'A'1 by 5 Mr.Ron Rowe San Joaquin County Public Health Services Environmental Health Divisions, Site Mitigation Unit 304 Weber Street,Third Floor Stockton,CA 95202 RESULTS OF DEEPER EXPLORATORY BORING AND WELL INSTALLATION AND WORK PLAN TO PERFORM A CONE PENETROMETER TESTING(CPT)SURVEY,FORMER SAN FRANCISCO FRENCH BREAD COMPANY FACILITY, 1444 SOUTH LINCOLN STREET, STOCKTON, CALIFORNIA,FOR METZ BAKING COMPANY Dear Mr.Rowe; On behalf of Metz Baking Company(Metz),SECOR International Incorporated(SECOR)is pleased to submit this document which presents the results of a recently completed deeper exploratory boring and well installation at 1444 South Lincoln Street in Stockton,California(the Site,see Figure 1). The deeper exploratory boring and well installation were performed in general accordance with work scope proposed in SECOR's Revised Work Plan dated September 4, 1997 and approved by San Joaquin County Environmental Health Division(SJCEHD) in a letter dated September 12, 1997. Based on the findings of the deeper exploratory boring and well installation, SECOR recommended delaying installation of additional monitoring wells at the Site until a cone penetrometer test(CPT)survey could be completed to rapidly and cost-effectively assess the vertical and lateral extent of petroleum hydrocarbon-affected groundwater underlying the Site. Accordingly, this document also presents our approach, work scope,and methodologies for the proposed CPT survey(Work Plan). Based on the results of the recent soil and water investigation (installing well cluster MW-7), the schedule provided in the letter dated August 5, 1997 from the SJCEHD will need to be revised. SECOR will include a revised schedule in the CIT findings letter report. DEEPER EXPLORATORY BORING AND WELL INSTALLATION Drilling,Soil Sampling,and Groundwater Grab Sampling One exploratory borehole (MW-7) was advanced on October 27 through 29, 1994 by West Hazmat Drilling Corporation(West Hazmat)of Rancho Cordova,California under the supervision of a SECOR geologist(Figure 2). The exploratory borehole was advanced within the limits of the former UST excavation pit. The borehole was continuously cored to a total depth of 90 feet bgs using a CME 75 drilling rig equipped with 8-inch diameter hollow-stem augers. During advancement of the borehole,relatively undisturbed continuous core soil samples were collected for lithologic description and possible chemical analyses using a five-foot core barrel. The SECOR geologist described the soil encountered according to the Unified Soil Classification System(USCS) and maintained a boring log of these descriptions which is included as Attachment A. A representative soil sample from each sample interval was screened in the field for the presence of volatile organic compounds (VOCs)using an organic vapor meter 580B Photoionization Detector(PID). Screening results were documented on the boring logs. The ends of the brass tubes containing the soil samples were covered with teflon sheeting,capped with plastic end caps,labeled,and stored in a cooler containing ice. The samples selected for chemical analysis were delivered HASFFRkM CKTORIlWKP2.RPT 90 New Montgomery Street, Suite 620, San Francisco, CA 94105-4503 (415)882-1548 (4.75)882-4406 FAX www.secor com