ARCHIVED REPORTS XR0006585 - Laserfiche WebLink

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GETTLER - RYAN INC. October 31, 2001 �1:--' �� Mr Michael J Infurna Jr NOV 0 12001 San Joaquin County Public Health Services Environmental Health Division ENVIRUNMENT HFALTH 304 East Weber Avenue,Third Floor PERMIT/SERVICES Stockton, California 95202 Subject Submittal of Analytical Results and Proposal for Alternative Scope of Work Tosco (Former BP) Service Station No 11192, 1403 Country Club Boulevard, Stockton, California. Mr Infurna At the request of Tosco Corporation, a subsidiary of Phillips Petroleum Company (Tosco), Gettler-Ryan Inc (GR) has prepared this letter to follow up on our phone conversation on October 24, 2001 The purpose of this submittal is to outline Tosco's and GR's near-term plans for the subject site Based on our discussion, this work is being proposed as an alternative to comply with the November 1, 2001 deadline in GR's letter to the San Joaquin County Public Health Services—Environmental Health Division (PHS-EHD) dated July 2, 2001 As discussed, Tosco is proposing to conduct a Dual-Phase Vapoi Extraction Pilot Test (DPE • Test)using wells MW-3 and/or MW-7 at the site Conducting this test will result in the collection of remedial feasibility data and provide interim remedial cleanup of elevated dissolved hydrocarbons in the vicinity of these wells It is Tosco's and GR's highest priority to begin to address the elevated hydrocarbon concentrations at this site The DPE test is being-scheduled for December 4, 2001 A work plan dated October 29, 2001 describing this scope of work has been submitted under separate cover - As recommended in GR's Monitoring Well Installation Report, dated September 26, 2001, monitoring well MW-11 was sampled on October 4, 2001 All field work was conducted in accordance with the enclosed GR Field Methods and Procedures Analytical Results of the, sample collected from MW-11 showed no detectable concentrations of Total Petroleum Hydrocarbons as gasoline, benzene, toluene, ethylbenzene, or total xylenes Methyl tert-butyl ether and 1,2-Dichloroethane were detected at concentrations of 200 parts per billion (ppb) and 14 ppb, respectively The analytical results are summarized in Tables I and 2 The Laboratory Analytical Report,Chain of Custody Document, and the Field Data Sheet are enclosed Per our discussion, GR is preparing to conduct a monitoring and sampling event for all eleven existing wells at the site The sampling event data` will further document hydrocarbon concentrations in the newly installed and previously existing wells and verity our previously reported groundwater flow direction This sampling event is being scheduled for November 2001 In addition, GR will attempt to coordinate a joint monitoring event with the consultant for the •~ former Shell site, located east of the subject site across Pershing Avenue This joint monitoring event will be proposed for January or February 2002 6747 Sierra Court , Suite J • Dublin , California 94568 • ( 925 ) 551 - 7555