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PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY W <br /> ENVIRONMENTAL HEALTH DMSION <br /> Karen Furst, M D , M PH., Health Officer <br /> 304 East Weber Avenue, Third Floor - Stockton, CA 9520 <br /> 2091468-3420 C(Du--� <br />' JOE ALDRIDGE MAY 0 5 08ULTRAMAR INC <br /> PO BOX 466 <br />' HANFORD CA 93232-0466 <br /> RE Former Beacon #419 SITE CODE 1756 <br />' 2350 E Waterloo Rd <br /> Stockton, CA , 95205 <br /> San Joaquin County Public Health Services, Environmental Health Division (PHS-EHD) <br />' has reviewed the "Letter Amendment To Work Plan" dated April 16, 1998 as submitted <br /> by Horizon Environmental Inc , on Apnl 20, 1998 and has the following comments <br /> PHS-EHD appreciates Ultramar's assertive attitude demonstrated in proposed remedial <br /> efforts included in the recently received workplan Plans to install vapor wells in soil <br /> borings SB-6 thru S11-9 with multiple casings if vadose contamination is vertically <br /> extensive may appear technically effective but has not been shown to be cost-effective <br /> for this site <br /> Paragraph two, section 2 2 of the amendment, (!f soil bong SB-6 encounters <br /> hydrocarbon-impacted soil or groundwater at the histoncal low groundwater level, then <br /> soil bongs SB-7, SB-8, and SB-9 may be dnlled to define the lateral extent of <br /> hydrocarbons at the h►stoncal low groundwater level of 85 feet bgs ) references only a <br /> possibility that investigation of the lateral extent of deep soil contamination will be <br /> conducted PHS-EHD will require the soil plume to be laterally defined before any <br /> remediation can be conducted <br /> PHS-EHD recommends that a soil vapor extraction test be conducted after only a <br /> minimum number of vapor wells are installed This amendment should be revised to <br /> include the air sparge well (AS-1) installation in the event soil or groundwater <br /> contamination is detected in S13-6, as noted in Section 2 1, paragraph 4 This will allow <br /> the effectiveness of the full air-spargelvapor extraction process to be evaluated in this <br /> mobilization <br /> PHS-EHD recommends that Ultramar collect "continuous core" soil samples at depths <br /> where deep monitoring wells are proposed to be installed The two deepest soil <br /> samples collected should be analyzed and not the "selected soil samples" as proposed <br /> in section 2 1 Samples are to be analyzed for TPH-G and Methanol by EPA Method <br /> 8015m and the other six oxygenates by EPA Method 8260, as well as BTEX by EPA <br /> Method 8020 <br /> A Division of San Joagwn Counry Healcls Care Services <br />