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OCT 081991 <br /> PUBLIC HEALTH SEM4CES Q,A u'±� x ::M <br /> 5AI IOAQU-INCOUNTY <br /> [OGI KHA\NA Ntl)..,NI.FA. <br /> Ht2161 Officers: <br /> P.O. Box 2009 0 (1601 East Hazelton Avenuc) •Stockton,California 95201 <br /> (209)46&3400 <br /> OCT 7 1991 <br /> F KURT MILLER C(op <br /> SHELL OIL COMPANY <br /> P 0 BOX 5238 <br /> CONCORD CA 94524 <br /> RE: Shell Service Station IN REPLY REFER TO SITE CODE: 1785 <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 Ietter <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/EHE] will need to see repeatable sampling from a monitoring well <br /> downgradient 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 Report which 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 /> LJFI' 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 /> Z <br /> M.P.H. <br /> EHS, Program Manager <br /> th Division <br /> LAC/SS:nr <br /> c: CVRWQCB - Elizabeth Thayer <br /> �^ Aegis Environmental, Inc. - Jacqueline Doub <br /> V ' 1050 Melody Lane, Suite 160; Roseville, CA 95678 <br /> A Divi+ion of Sat lrnquin Ownty Hee th Care*Me% <br />