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vo 411V1 1n11 17:42 FAX 10003 KtEtNFEt DER FIELD EXPLORATIONS AND TESTING The subsurface conditions at the site were explored on April 5, 2001, by drilling one boring to a depth of approximately 15 feet below existing grade. The boring was drilled using a Simco 2400 truck-mounted drill rig equipped with 4-inch O.D. solid-stem auger. During the same r;rnr Period, a Percolation boring was drilled in the northeast and southwest - rnmerq of the tot at depths of about 9 and 13 feet below site grade, n!.—T rively_ The apprnx;mate percclztion test locations are presented on the attached p1a'-e. Rased on our Rnd1'nn� .wn L •t . 6 , sl%��w.a c so.-Is wlcVuritered wu3isied of interbedded strata of silty •. ...ay..y saaus, saucy aitu sully clays, and sandy silts. The siity sands encountered at the aprproxiruate 2.5 to 35 loot depth were Weakly cemented. The percolation tests were performed in accordance with accepted guidelines using clear notable water. The procedure calls for first placing about 2 inches of fine gravel at the bottom of rhe bore hole. The hole is then pre-soaked with water at least 24 hours prior to prrfnr i a the test. The test is performed by first adding 6 inrhec nfwster now I foo, of+�relation test depth. -�^-•n C-- - Y--- uvv.r the gravel is then added to the hole From a fiv_ed reference ^^i^• aw dr^^ , lave, y.. . y .. •,F •n,, watcr a ib mP.a Q1LTPf� in annfnYiinately Z!1_wy'n,ae 1� C C c. --rr-"--- •J •• .• lnte,^.'Fi•a wr•otic Boors, rc1•]hag d5 iu.Ge3Jaiy tU maintwn theYres—�ib •'••••�• 4 Cf W=Cr over LL:e grave'.. vuuol i'uc uusurvi lion of a sanitarian from the San Joaquin COunty ,cuouc racartn Department, the iast 30-minute reading of the tour hour Niaruu i3 rccorded and used to caicwate me percolation rate in minutes per inch. The estimated percolation rates at each test location arc as summarized below. A copy of our field percolation test results is attached. ? c3itL , P_1 to c n av n a-a. >.J 23 VTT•TJ A'rr T A A THAT!• W`•T !` •�Y^%TV �. .rvruiu•.+ ...•aa..�.v a.ea a aya�a We have been requested by Mr. Mike Huggins of the $an, Tnann_i_nrnttnty Athur Naahh Cann o Deoartment Environmental Health Division (PucEuIM ,o calci tate the ^;Late load•.;g :r the nrnnnsgri lrarh finlrf. at-vm_ aSe 2tX�*e, *WC a^...k. a v,7 V,0o'wudaru WA ""laic AS -°.5 r WU15launi nsr li�tr /717(1.1 .and 10 /i r• r l.._-•_- c r-• --- r.- ai rny, :S 1L:tiog0n am Our c4n,uouwl 01 ruiiaie loading, we have used ..... •a•••wvut, itw8s uaaau..o ci{'liatiltu (suuice. PIC(11Ctmg Ground-water 13itIaze-iVitrogen ____ .._... .l 1rwpw.r&, namx-who wad rinnemore (1992jj, which is presented below with an explanation for each tactor and the value used in our study. 20-0585-01.G01/2011R602 June 14,2001 19 2uu1 Klctntelder,inc- Page 2 of 4