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w <br /> Bast m and Ce1dwe11 <br /> Consultants <br /> '2355?rcct <br /> �asrameNo ,-4 <br /> x"'4 L'3htprn+a 95811i092 <br /> w' ,y56t 111.0123 <br /> r;a 19161111-8137 <br /> lanuarY 141 1991 <br /> Mr.Kyle Ch'n ti Company <br /> ARCO Prod de las pulgas 017-3173-7111 <br /> 20M Alameda <br /> post Office Calif 911 84402 <br /> San Mateo, Results ARCO Station 3133, <br /> carter 1990 Sampling California <br /> Subject: Third Q • •re Stockton, <br /> 29518 Benjamin gglt Dr: , <br /> groundwater samples from <br /> Dear Mr. Christie: dwell coL'ected gr wi•.h <br /> and 19, 19c�0,Brown and Caldwell schedule for sampling 4'U$t <br /> 17, 18, d 15 wells sampled during `' <br /> On September ect site. The site is on r,an swmpling of 199'• <br /> wells at the subs send and fourth quiuarterly <br /> 13,n(wellsisa led during r 1990 sampling event is the thirdq <br /> eight wells samp - 5epmrnbe Task Order 2133-90-2 <br /> and third quiets' lin event under were dry <br /> and samp g this quarter because they a rates. <br /> It is also the .ec not sampled slow recharge <br /> and E-6 were difficult because of very recharge. This <br /> wells E was slow and d112 Were especially slow to re materials. <br /> Monitorin8 most sle collection ' 11, and E- for-mattonal <br /> Additionally, E-7, E-9,E-10,E ns with clayey <br /> wells E-5in of the well scree <br /> lvl01 io ng be the result of clv?,g g <br /> condition may g-10,E-11, <br /> Sampiirg 2 E-4,g-5,E-7,E-S,E`9' well-. <br /> Quarterly ] B�"2'E ' to urge approximately t- <br /> PR-2,Bim- pump P separate, disposable, <br /> ► st mpltng wells PR-1 ces used a diaphragm P led using a sep sferred directly <br /> Prior -ory Armour petroleum Sev h well was sampled as trap' ta. Cross <br /> and each well. Ea, The sample w lined <br /> es of water From bottom ernPtr'ng valve. sept, <br /> casing volumes lass bottles with Tel.on- <br /> anth a osable bailers and hoses <br /> polyetlylen bailer equipped o 40-milliliter g arte disp <br /> bottom valve into tw dough the use of sep <br /> throughles was minimized <br /> .onta��nation of samples <br /> at each well• of collection <br /> die hragm P of�ustody from d'of the samples were <br /> on the P under chain- California Alient, lenes <br /> s Dred on ice and kept ento, ethy tmoudified with EPA <br /> The samples were Laboratories, in Sacram lbenzene� <br /> h delivery to Eure bens rfp�and ben A) Method 8015, <br /> throu'for total petroleum hydra.'ar ency ( <br /> t: analy ental Protection Ag <br /> `. <br /> TX) by '3.S. Environm <br />