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y1 1 <br /> PUBLIC HEALTH SERVICESIq,ty <br /> SAN JOAQUIN COUNTY <br /> ENVIRONMENTAL HEALTH DIVISION <br /> Karen Furst, M.D,, M.P.H., Health Officer <br /> 304 East Weber Avenue, Third Floor a Stockton, CA 95202 �� ► ��'* <br /> 2091468-3420 <br /> MAY 1 7 z000 <br /> FRANK QUINTA 3AME3 RAM5EY <br /> 2072 W YOSEMITE AVE 840 LA CONTENTA DRIVE <br /> MANTECA CA 95335 VALLEY SPRINGS CA 95252 <br /> RE. FRANKS EXXON SITE CODE: 1426 <br /> 2072 W YOSEMITE.AVE <br /> MANTECA CA <br /> San Joaquin County Public Health Servlets Environmental Health Division (PHS/EI-ID) has reviewed the <br /> Aqua Science Engincers Inc (ASE) "Report of Sod and Groundwater-issesstnent"reCcived May 11, 2000 <br /> As a result of reviewing the report PHS/EHD provides the following cornments and directives <br /> Multilevel monitor wells and piezometers installed at the site have been used to document the presence of <br /> several groundwater contarrnnants, many above established Maximum. Contaminant Levels (MCL's) <br /> 0 including MtBE and berizene CantMvnants Include separate phase fuel hydrocarbons (free-product) PCE, <br /> 1,2-D:chloropropane,TPH-gasoline, TPH-diesel, toluene,ethylberizene, xylenes,TAME, TBA, McOH and <br /> EtQH <br /> Through preYious reports ASE has established the potential risk to nearby rcoeptors All groundwater zones <br /> (0 to greater than 100 feet bps) evalutited to date ar: ._ _ . <br /> wth to water is <br /> approximately 13 feet below grade surface (bgs) Greater than S7 1shallow� twarants wells are present within <br /> 2000 feet of this site, Groundwater off-site is impacted with fuel hydrocarbons The lateral and vertical <br /> characterization of the groundwater plume is currently undeflned. Gradient and groundwater flow is <br /> variable with depth, and a downward vertical flow component is evident Groundwater flow direction and <br /> gradient in the deeper zones of the aquifer(100 feet bgs)cannot be plotted because only two of the required <br /> three non-linear points exist to date. <br /> PHS/EHD concurs with the majority of ASE't recommendations The first priority is sampling and <br /> analyses of the closest drinking water wells, ASE lasts seven addresses for the first round of anxlya <br /> Contact PHS/EHD to schedule field work for this purpose as soon as possible, Other water wells may <br /> require sample collection and analyses as the groundwater plume is defined Full scan EPA Method 8260 <br /> analyses is recommended <br /> Additional groundwater monitor wells are needed A third deep well (100 feet bgs) to complete the non. <br /> linear three point evaluation should be installed during the next well installation mobilization Monttar <br /> wells in the shallow and intermediate zone should be installed in down gradient positions as soon as <br /> Possible in order to evaluate risk to regional groundwater supplies and design of remediation systems, <br /> Remediation system feasibility studies may be presented to PHS/F iD in workplan format, <br /> PHS/EHO does not concur with recommendations to modify quarterly groundwater sampling at this time <br /> Please continue to sample all monitor wells on a quarterly basis until further written notice from this office <br /> 0 <br /> A t]M610n of San Joaquin County Health Care Ser%ices <br /> to -d QT2LRZ0G0Z S.>iN4dZ1_A wd 9Z. 60 00_9Z—AVW <br /> -IhU7 T^C unnti, r 1 c'r r-709n7 Fllh J I 111(it)7 rf) 0()_ i7—/1eW p2A 1 GOON <br />