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,aUCA kICLE INEE. L DE F F' ka3 j - One way to avoid sampling this water is to wait for it to flow past the well The ground water gradient in the area of the Jordan site is approximately 0 0021 Theporosity of stlty-sand is 0.2, the permeability is approximately 1 x 10-1 ft/day. Using Darcy's equation, ground water flows beneath the Jordan site at the rate of 0 001 ft/day. One would have to wait years before the pressure wave affected water has moved past the well A second way to deal with this problem is to remove the affected water Assume that the water within a 1 foot radius of the well must be removed, the well screen is 20 feet long, and the soil porosity is 0.2. The volume of water that would have to bed from the well would be approximately 94 gallons (30 well volumesf Therefore, purging the well o at least 94 gallons before sampling is sufficient to remove the water affected by development. This latter option is the one that will be employed by Kleinfelder when we collect samples 24 to 48 hours after development. 4 Location of Sewer Lines - The attached map shows the location of the main sewer line and lateral with respect to the proposed monitoring well locations Please review this letter at your earliest convenience If you have any questions, give me a cal Sincerely, KLEINFELDER SAN JOAQUIN LOCAL HEALTH DISTRICT 16C, F. Mazelton Ave -Phone : 466-6781 P ` B x 2Stockton, Ca, 96201 Timothy A. Crandall ❑ ,V ea Staff Engineer Environmental Services Division A,lt>i'o'ed with c ranges : see Remarks Central Valley Group '� Disaplroved , See Remarks TAC.rmm Rem, . Ls �-- 124-$$-1234 pate n98 Bp Approva_ of these plans extends only to that w1:rch is shown and described here- on but does not authorize or approve *ny omission or deviation of require- *ents of State laws or local Ordlnancee 6 s--14CE #la s� is V)LT* k) :Sb (t. ftf3A-L4S t s 1>J Wt;i�)ITDW --Tb � S-�L RZ6 W LIQ Sro 125?� ev--