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I <br /> PUBLft HEALTH SERVICES <br /> SAN JOAQUIN COUNTY =' <br /> JOG[ KHANNA M.D..M.P H. <br /> Health Officer �P 9 <br /> P.O. Box 2009 • (1601 East Hazelton Avenue) • Stockton, California 95201 <br /> C4�IFOR�` <br /> (209) 468-3400 <br /> OCT 71991 (OD Py <br /> F KURT MILLER <br /> SHELL OIL COMPANY <br /> P O BOX 5238 <br /> CONCORD CA 94524 <br /> RE: Shell Service Station IN REPLY REFER TO SITE CODE: 1785 ? <br /> i <br /> 4445 Pershing Avenue <br /> Stockton, CA <br /> San Joaquin Public Health Services, Environmental Health Division (PHS/EHD) has reviewed Aegis' latest <br /> Quarterly Groundwater Monitoring Report (September 12, 1991) as well as Aegis' August 26, 1991 letter <br /> addressed to you and has the following comments: <br /> 1. The quarterly reports to date have established a northeasterly groundwater gradient. PHS/EHD <br /> recognizes the screening potential of the hydropunch in certain circumstances, however, in this <br /> particular situation PHS/EHD will need to see repeatable sampling from a monitoring well <br /> downZradieRC from the probable source. The investigation has not pursued data collection in the <br /> area most likely to indicate what contamination may or may not be present on this site. Additional <br /> subsurface/groundwater data collection is viewed as necessary in this regard. <br /> 2. Table 2 of the Quarterly Reportwhich tabulates the analytical results for groundwater,should report <br /> the values in parts per billion (ug/ml) as indicated in the State Water Resources Control Board <br /> LUFT Field Manual. <br /> 3. This chain of custody for the three monitoring wells did not copy well and the signatures,times, and <br /> dates are not readable. Please provide PHS/EHD with a legible copy. <br /> If you have any further questions, contact Steven Schneider, RENS, of my staff at (209)468-3441. <br /> Jogi Khanna, M. , M.P.H. <br /> 1 <br /> Health Offic <br /> L ie A. Cotulla, RENS, Program Manager <br /> nvironmental Health Division <br /> LAC/SS:nr <br /> c: CVRWQCB - Elizabeth Thayer <br /> c: Aegis Environmental, Inc. - Jacqueline Doub <br /> 1050 Melody Lane, Suite 160; Roseville, CA 95678 <br /> A Division of San Joaquin County Health(arc"Iccs <br />